Popular transistor data in spreadsheet format?

[Don Kuenz]

Greetings,

Does anyone know of a spreadsheet (a comma separated variable format is
better) that contains data for popular transistors? A single device
fills each row, with columns for part number, maximum rating, electrical
characteristics, small signal characteristics, and switching
characteristics.

Thank you,

--
Don Kuenz

 

[whit3rd]

On Sunday, June 29, 2014 11:06:47 AM UTC-7, Don Kuenz wrote:

Does anyone know of a spreadsheet (a comma separated variable format is
better) that contains data for popular transistors?

I've made one for my own stash of parts (which aren't really 'popular
transistors'). It's a bit less useful than 3 x 5 cards (with pinouts, to be
refrigerator-magnet posted above the workbench as I wire gizmos up).

If you build your own format, remember to put price/date/supplier info somewhere.

It used to be, that libraries would get (dead-trees) catalog cards from the book publisher with
each volume. Yes, it WOULD be wonderful to get a shortform data archive. Several
have been started.... does anyone recall the GIICM?

 

Such a list is primarilyy useful for replacement purposes in non-critical applicartions. Like audio outputs and such. there are really too many important parameters to do it that wat for design. I have a thirty year old transistor specs book published by Howard W. Sams which od great for doing like vintage audio work. But for design I would rather see the gain curves and all that, as well as their published SOA graph and a bunch of other things.

Later cam the "Japanese Transistor Manual" whaich had almost all the types to date, but had no JEDEC (2N, only 2S). Well, that was OK as well buy I will never give up the old book because all types are in there, up to about 1975 or something. It even has specs on those five digit RCA transistors, like the 40022 and shit. (PNP germanium about 40 volts and a couple of amps, TO-3) Came in handy working on a vintage HK Citartion 12. the print you get online says you can use a 2N3055 for the outputs but that is NOT true. Well I wouldn't. Even though the gain is slightly lower I decided on 2N3773s. Since the drivers were blown I replced them as well with slightly higher gain units. I do not remember the numbers offhand but all in all, the thing works. Sounds good.

there are other parametersa that are not so apparent. When you just go by voltage, current, hfe and power, you don't always get what you want. I worked on a TV a long time ago that had a shitty picture. the gamme was all fucked up. I mean the shades of grey were just not right. It wasn't clipped per se, but it was fucked up.

Turned out someone has changed a video transistor and used a device that was designed for RF outpur stages. the gain in such units is not linear and is intended to be not linear.

An examination of the complete specs of that transistor would have told a competent tech that it was not a suitable replacement.

So, really, it is nice to have a compedoium of all these registered devices, but in no way can it replace a detailed dataasheet.

 

[John Larkin]

On Sun, 29 Jun 2014 18:06:47 +0000 (UTC), Don Kuenz <garbage@crcomp.net> wrote:

Greetings,

Does anyone know of a spreadsheet (a comma separated variable format is
better) that contains data for popular transistors? A single device
fills each row, with columns for part number, maximum rating, electrical
characteristics, small signal characteristics, and switching
characteristics.

Thank you,

The Mouser and Digikey sites are handy for searching for candidate parts, across
multiple manufacturers. Of course, you have to load and read the PDFs for the
deep details.




--

John Larkin Highland Technology Inc
www.highlandtechnology.com jlarkin at highlandtechnology dot com

Precision electronic instrumentation

 

[John Robertson]

On 06/29/2014 11:06 AM, Don Kuenz wrote:

Greetings,

Does anyone know of a spreadsheet (a comma separated variable format is
better) that contains data for popular transistors? A single device
fills each row, with columns for part number, maximum rating, electrical
characteristics, small signal characteristics, and switching
characteristics.

Thank you,

--
Don Kuenz

Back in 2012 a fellow made up a huge list of transistor cross-reference
that he was selling on CD - here is his contact info:

Rob Legg Power Electronics Specialist legg (at) magma (dot)ca

I bought a CD and it is extremely comprehensive...and no, I don't make
copies - the guy put a lot of work into it so he is entitled to get some
small return on his time.

John :-#)#

--
(Please post followups or tech inquiries to the newsgroup)
John's Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9
(604)872-5757 or Fax 872-2010 (Pinballs, Jukes, Video Games)
www.flippers.com
"Old pinballers never die, they just flip out."

 

[Cydrome Leader]

jurb6006@gmail.com wrote:

Such a list is primarilyy useful for replacement purposes in non-critical applicartions. Like audio outputs and such. there are really too many important parameters to do it that wat for design. I have a thirty year old transistor specs book published by Howard W. Sams which od great for doing like vintage audio work. But for design I would rather see the gain curves and all that, as well as their published SOA graph and a bunch of other things.

Later cam the "Japanese Transistor Manual" whaich had almost all the types to date, but had no JEDEC (2N, only 2S). Well, that was OK as well buy I will never give up the old book because all types are in there, up to about 1975 or something. It even has specs on those five digit RCA transistors, like the 40022 and shit. (PNP germanium about 40 volts and a couple of amps, TO-3) Came in handy working on a vintage HK Citartion 12. the print you get online says you can use a 2N3055 for the outputs but that is NOT true. Well I wouldn't. Even though the gain is slightly lower I decided on 2N3773s. Since the drivers were blown I replced them as well with slightly higher gain units. I do not remember the numbers offhand but all in all, the thing works. Sounds good.

there are other parametersa that are not so apparent. When you just go by voltage, current, hfe and power, you don't always get what you want. I worked on a TV a long time ago that had a shitty picture. the gamme was all fucked up. I mean the shades of grey were just not right. It wasn't clipped per se, but it was fucked up.

Turned out someone has changed a video transistor and used a device that was designed for RF outpur stages. the gain in such units is not linear and is intended to be not linear.

An examination of the complete specs of that transistor would have told a competent tech that it was not a suitable replacement.

So, really, it is nice to have a compedoium of all these registered devices, but in no way can it replace a detailed dataasheet.

anybody recall the RCA SK series and NTE replacement parts? I didn't deal
with them much, but I recall the "proper" method was dig up the
datasheets for the original part, then compare to the suggested substitute
specs and decide from there if it was close enough.

They eventually had some software version of the cross-ref database, but
it did not tell you the specs of the original parts.

 

[jeanyves]

On 2014-06-29 21:00:23 +0200, whit3rd said:

On Sunday, June 29, 2014 11:06:47 AM UTC-7, Don Kuenz wrote:

Does anyone know of a spreadsheet (a comma separated variable format is
better) that contains data for popular transistors?

I've made one for my own stash of parts (which aren't really 'popular
transistors'). It's a bit less useful than 3 x 5 cards (with pinouts, to be
refrigerator-magnet posted above the workbench as I wire gizmos up).

If you build your own format, remember to put price/date/supplier info
somewhere.

It used to be, that libraries would get (dead-trees) catalog cards from
the book publisher with
each volume. Yes, it WOULD be wonderful to get a shortform data
archive. Several
have been started.... does anyone recall the GIICM?

here is one 46000 transistors file
http://kripton2035.free.fr/semiconductorsre.html

--

Jean-Yves.

 

[Sjouke Burry]

On 01.07.14 23:27, jeanyves wrote:

On 2014-06-29 21:00:23 +0200, whit3rd said:

On Sunday, June 29, 2014 11:06:47 AM UTC-7, Don Kuenz wrote:

Does anyone know of a spreadsheet (a comma separated variable format is
better) that contains data for popular transistors?

I've made one for my own stash of parts (which aren't really 'popular
transistors'). It's a bit less useful than 3 x 5 cards (with pinouts, to be
refrigerator-magnet posted above the workbench as I wire gizmos up).

If you build your own format, remember to put price/date/supplier info
somewhere.

It used to be, that libraries would get (dead-trees) catalog cards from
the book publisher with
each volume. Yes, it WOULD be wonderful to get a shortform data
archive. Several
have been started.... does anyone recall the GIICM?

here is one 46000 transistors file
http://kripton2035.free.fr/semiconductorsre.html

Thanks

 

You can also use the following link to NTE for cross referencing transistors etc to an NTE equivalent.

Dan

http://nte01.nteinc.com/nte/NTExRefSemiProd.nsf/$$Search?OpenForm

 

[Bruce Esquibel]

Cydrome Leader <presence@mungepanix.com> wrote:

anybody recall the RCA SK series and NTE replacement parts? I didn't deal
with them much, but I recall the "proper" method was dig up the
datasheets for the original part, then compare to the suggested substitute
specs and decide from there if it was close enough.

They eventually had some software version of the cross-ref database, but
it did not tell you the specs of the original parts.

Off hand I think GE and ECG (Sylvania) were the first two that went
head-to-head in the substitution wars. The SK and NTE, which I always though
was odd, NTE basically copied the ECG line, came later on.

They printed these phone book sized substitution guides, usually the first
sections showing the complete line, with specs and the major section of
transistor numbers to which substitute device. Generally the last section
was some IC's and other linear devices.

I think it boiled down to A) most U.S. made stuff used 2N transistors and
the Japanese had the 2SA 2SB 2SC ones, which for all practical purposes did
have equivalents in the 2N arsenal and B) there really are a lot of
transistors similar to each other where using one for the other just doesn't
make any difference.

NTE was really an oddball, besides being a copy of ECG (a NTE-123 was the
same part as ECG-123), they even copied Sylvania's book, where somewhere
around 1983 or so, were sued by Sylvania because Sylvania buried fake part
numbers (transistor numbers that didn't exist) and NTE copied them exactly.

Another thing NTE did, all their parts had like a 1 year, no questions
asked, warranty on them. That was pretty handy for some of the high power
ones, like that scr/triac thing that Sony used for horizontal sweep in the
Trinitron models. Those things went bad looking at them cross-eyed and they
were not cheap.

Plus the NTE line was almost half of the ECG price across the board.

By the mid/late 80's, IC's pretty much spelled out the death of the
substitution wars although I remember still getting substitution reference
manuals thru the 90's. But like the Radio Shack and Sears catalogs, they
were getting thinner and thinner as time went on.

-bruce
bje@ripco.com

 

[jeanyves]

On 2014-07-02 12:34:57 +0200, dansabrservices@yahoo.com said:

You can also use the following link to NTE for cross referencing
transistors etc to an NTE equivalent.

Dan

http://nte01.nteinc.com/nte/NTExRefSemiProd.nsf/$$Search?OpenForm

for an inline cross reference search I prefer this one :
http://alltransistors.com/

regards,
--

Jean-Yves.

 

[Michael A. Terrell]

Cydrome Leader wrote:

jurb6006@gmail.com wrote:
Such a list is primarilyy useful for replacement purposes in non-critical applicartions. Like audio outputs and such. there are really too many important parameters to do it that wat for design. I have a thirty year old transistor specs book published by Howard W. Sams which od great for doing like vintage audio work. But for design I would rather see the gain curves and all that, as well as their published SOA graph and a bunch of other things.

Later cam the "Japanese Transistor Manual" whaich had almost all the types to date, but had no JEDEC (2N, only 2S). Well, that was OK as well buy I will never give up the old book because all types are in there, up to about 1975 or something. It even has specs on those five digit RCA transistors, like the 40022 and shit. (PNP germanium about 40 volts and a couple of amps, TO-3) Came in handy working on a vintage HK Citartion 12. the print you get online says you can use a 2N3055 for the outputs but that is NOT true. Well I wouldn't. Even though the gain is slightly lower I decided on 2N3773s. Since the drivers were blown I replced them as well with slightly higher gain units. I do not remember the numbers offhand but all in all, the thing works. Sounds good.

there are other parametersa that are not so apparent. When you just go by voltage, current, hfe and power, you don't always get what you want. I worked on a TV a long time ago that had a shitty picture. the gamme was all fucked up. I mean the shades of grey were just not right. It wasn't clipped per se, but it was fucked up.

Turned out someone has changed a video transistor and used a device that was designed for RF outpur stages. the gain in such units is not linear and is intended to be not linear.

An examination of the complete specs of that transistor would have told a competent tech that it was not a suitable replacement.

So, really, it is nice to have a compedoium of all these registered devices, but in no way can it replace a detailed dataasheet.

anybody recall the RCA SK series and NTE replacement parts? I didn't deal
with them much, but I recall the "proper" method was dig up the
datasheets for the original part, then compare to the suggested substitute
specs and decide from there if it was close enough.

They eventually had some software version of the cross-ref database, but
it did not tell you the specs of the original parts.

SK? Started using them in the mid '60s
NTE was a clone of the Sylvania ECG series. I was using ECG parts in
1970. ECG published a set of three databooks on their components. Then
it was sold to Philips, and finally to NTE when Philips got out of that
business.

Motorola had their HEP series.

General Electric had their GE series.

Workman Electronics had a smaller series of parts, along with a
couple dozen other short lived companies who tried to enter that
business.

http://www.nteinc.com is the NTE website

--
Anyone wanting to run for any political office in the US should have to
have a DD214, and a honorable discharge.

---
This email is free from viruses and malware because avast! Antivirus protection is active.
http://www.avast.com

 

[Michael Black]

On Wed, 2 Jul 2014, Michael A. Terrell wrote:

Cydrome Leader wrote:

jurb6006@gmail.com wrote:
Such a list is primarilyy useful for replacement purposes in non-critical applicartions. Like audio outputs and such. there are really too many important parameters to do it that wat for design. I have a thirty year old transistor specs book published by Howard W. Sams which od great for doing like vintage audio work. But for design I would rather see the gain curves and all that, as well as their published SOA graph and a bunch of other things.

Later cam the "Japanese Transistor Manual" whaich had almost all the types to date, but had no JEDEC (2N, only 2S). Well, that was OK as well buy I will never give up the old book because all types are in there, up to about 1975 or something. It even has specs on those five digit RCA transistors, like the 40022 and shit. (PNP germanium about 40 volts and a couple of amps, TO-3) Came in handy working on a vintage HK Citartion 12. the print you get online says you can use a 2N3055 for the outputs but that is NOT true. Well I wouldn't. Even though the gain is slightly lower I decided on 2N3773s. Since the drivers were blown I replced them as well with slightly higher gain units. I do not remember the numbers offhand but all in all, the thing works. Sounds good.

there are other parametersa that are not so apparent. When you just go by voltage, current, hfe and power, you don't always get what you want. I worked on a TV a long time ago that had a shitty picture. the gamme was all fucked up. I mean the shades of grey were just not right. It wasn't clipped per se, but it was fucked up.

Turned out someone has changed a video transistor and used a device that was designed for RF outpur stages. the gain in such units is not linear and is intended to be not linear.

An examination of the complete specs of that transistor would have told a competent tech that it was not a suitable replacement.

So, really, it is nice to have a compedoium of all these registered devices, but in no way can it replace a detailed dataasheet.

anybody recall the RCA SK series and NTE replacement parts? I didn't deal
with them much, but I recall the "proper" method was dig up the
datasheets for the original part, then compare to the suggested substitute
specs and decide from there if it was close enough.

They eventually had some software version of the cross-ref database, but
it did not tell you the specs of the original parts.


SK? Started using them in the mid '60s
NTE was a clone of the Sylvania ECG series. I was using ECG parts in
1970. ECG published a set of three databooks on their components. Then
it was sold to Philips, and finally to NTE when Philips got out of that
business.

Motorola had their HEP series.

General Electric had their GE series.

Workman Electronics had a smaller series of parts, along with a
couple dozen other short lived companies who tried to enter that
business.

http://www.nteinc.com is the NTE website

And the results seemed to vary.

I remember some big blunders in the HEP catalog, but so blatant that they
couldn't be anything but errors. But Radio Shack's replacement line wsa
pretty small, and what I remember is them trying to match a lot of devices
with the small number they had, and failing badly as a result. HEP had a
decent selection, so the cross reference tended to be useful, if not
perfct.

I had an HEP replacement guide, free in the mail, about 1972. But I never
remember buying any HEP replacement device, I remember even warning a kid
at school (he said "but I don't want to make a mistake", trusting the
article rather than third party advice that it was just a simple op-amp).
I just used the guide to find information about unknown devices, so
usefull decades back when we might not have databooks from all the
companies, and of course, checking something in one book was easier than
checking multiple books.

When I finally saw an ECG guide, late eighties, it was a vast improvement
over the HEP guide I had.

Michael

 

[Michael A. Terrell]

Michael Black wrote:

On Wed, 2 Jul 2014, Michael A. Terrell wrote:


Cydrome Leader wrote:

jurb6006@gmail.com wrote:
Such a list is primarilyy useful for replacement purposes in non-critical applicartions. Like audio outputs and such. there are really too many important parameters to do it that wat for design. I have a thirty year old transistor specs book published by Howard W. Sams which od great for doing like vintage audio work. But for design I would rather see the gain curves and all that, as well as their published SOA graph and a bunch of other things.

Later cam the "Japanese Transistor Manual" whaich had almost all the types to date, but had no JEDEC (2N, only 2S). Well, that was OK as well buy I will never give up the old book because all types are in there, up to about 1975 or something. It even has specs on those five digit RCA transistors, like the 40022 and shit. (PNP germanium about 40 volts and a couple of amps, TO-3) Came in handy working on a vintage HK Citartion 12. the print you get online says you can use a 2N3055 for the outputs but that is NOT true. Well I wouldn't. Even though the gain is slightly lower I decided on 2N3773s. Since the drivers were blown I replced them as well with slightly higher gain units. I do not remember the numbers offhand but all in all, the thing works. Sounds good.

there are other parametersa that are not so apparent. When you just go by voltage, current, hfe and power, you don't always get what you want. I worked on a TV a long time ago that had a shitty picture. the gamme was all fucked up. I mean the shades of grey were just not right. It wasn't clipped per se, but it was fucked up.

Turned out someone has changed a video transistor and used a device that was designed for RF outpur stages. the gain in such units is not linear and is intended to be not linear.

An examination of the complete specs of that transistor would have told a competent tech that it was not a suitable replacement.

So, really, it is nice to have a compedoium of all these registered devices, but in no way can it replace a detailed dataasheet.

anybody recall the RCA SK series and NTE replacement parts? I didn't deal
with them much, but I recall the "proper" method was dig up the
datasheets for the original part, then compare to the suggested substitute
specs and decide from there if it was close enough.

They eventually had some software version of the cross-ref database, but
it did not tell you the specs of the original parts.


SK? Started using them in the mid '60s
NTE was a clone of the Sylvania ECG series. I was using ECG parts in
1970. ECG published a set of three databooks on their components. Then
it was sold to Philips, and finally to NTE when Philips got out of that
business.

Motorola had their HEP series.

General Electric had their GE series.

Workman Electronics had a smaller series of parts, along with a
couple dozen other short lived companies who tried to enter that
business.

http://www.nteinc.com is the NTE website

And the results seemed to vary.

I remember some big blunders in the HEP catalog, but so blatant that they
couldn't be anything but errors. But Radio Shack's replacement line wsa
pretty small, and what I remember is them trying to match a lot of devices
with the small number they had, and failing badly as a result. HEP had a
decent selection, so the cross reference tended to be useful, if not
perfct.

I had an HEP replacement guide, free in the mail, about 1972. But I never
remember buying any HEP replacement device, I remember even warning a kid
at school (he said "but I don't want to make a mistake", trusting the
article rather than third party advice that it was just a simple op-amp).
I just used the guide to find information about unknown devices, so
usefull decades back when we might not have databooks from all the
companies, and of course, checking something in one book was easier than
checking multiple books.

When I finally saw an ECG guide, late eighties, it was a vast improvement
over the HEP guide I had.

The semiconductor industry had matured a lot in a decade. The problem
with the ECG & NTE books were that they dropped all references to any
part they dropped from their line. You might have the part in stock,
but there was no way to find it without a pile of old books.

--
Anyone wanting to run for any political office in the US should have to
have a DD214, and a honorable discharge.

---
This email is free from viruses and malware because avast! Antivirus protection is active.
http://www.avast.com

 

[Geoffrey S. Mendelson]

Michael A. Terrell wrote:

The semiconductor industry had matured a lot in a decade. The problem
with the ECG & NTE books were that they dropped all references to any
part they dropped from their line. You might have the part in stock,
but there was no way to find it without a pile of old books.

It looks like it has gone the way of the vacuum tube industry. Except for
a small number of specialized tubes (transmitting, high end audio), what is
left is either NOS (new old stock), and generic replacements sold as
various models depending upon who is buying them.

For example, there is a rumor (which is probably not wrong) that all
small signal NPN transistors made today are 2n2222's. If you want something
else, you can buy a million marked anything you want, cheap enough to retail
at a penny each including shipping from China.

For example, I bought some 2n5109 (reltively high power (1.5w), wide frequency
response (good over 144mhz) RF amps from a repespected dealer in the UK. I
noticed they did not act or look like NOS Motorola ones, and he offered
to refund my money, saying he got them from a trusted dealer in the EU,
and they were well received by customers.

They had 2n5109 stenciled on the side, no other markings and the Motorla
ones had a sealed metal can, these were in a metal can, but had resin
on the bottom. They had 4 wires (one cut), the Motorola had 3.

I looked up the Chinese spec sheet for them and the Central Semiconductor
ones are not clearly shown to tell if they are metal or resin, but they
are not 2n5109's, they are a new "better" transistor (higher frequency
response, more gain) sold as the old ones. I wonder how many other numbers
these transistors get stamped on them.

Geoff.

--
Geoffrey S. Mendelson, N3OWJ/4X1GM/KBUH7245/KBUW5379

 

[Geoffrey S. Mendelson]

Michael A. Terrell wrote:

The 2N5109 was used in CATV headend equipment, well past 300 MHz. I
replaced a few in an RCA (Design bought from EIE, then later sold to
Catel) headend with some intermittent spurs. They modulated at the IF
frequency, or converted an off air signal to IF, then used output
converters to put the signal on the desired channel. That was 30 years
ago, but I might still have a manual in my files.

I bought them to use in HF active antennas (PA0RDT type). Since then I have
found NOS 2n3866 work just as well at 1/5 the price along with 2N5179 and
BSX20 transistors. They are really there because they have a 50ohm output
impedance, and the smaller (2n5179/BSX20) transistors have a much smaller
chance of oscilatting and burning out.

I also found out the hard way that the PA0RDT design works ok at 9 volts,
better at 12 volts (noticably higher gain) and oscillates at 13.8 volts.
Next one will be built with a silicon rectifier string to drop the 13.8 to
12, unless the 7809's arrive from China.

Geoff.

--
Geoffrey S. Mendelson, N3OWJ/4X1GM/KBUH7245/KBUW5379

 

[Michael A. Terrell]

"Geoffrey S. Mendelson" wrote:

Michael A. Terrell wrote:


The semiconductor industry had matured a lot in a decade. The problem
with the ECG & NTE books were that they dropped all references to any
part they dropped from their line. You might have the part in stock,
but there was no way to find it without a pile of old books.


It looks like it has gone the way of the vacuum tube industry. Except for
a small number of specialized tubes (transmitting, high end audio), what is
left is either NOS (new old stock), and generic replacements sold as
various models depending upon who is buying them.

For example, there is a rumor (which is probably not wrong) that all
small signal NPN transistors made today are 2n2222's. If you want something
else, you can buy a million marked anything you want, cheap enough to retail
at a penny each including shipping from China.

There is a die number, etched into the silicon. You can decap or
decapsulate a suspect part, and see what it really is.

For example, I bought some 2n5109 (reltively high power (1.5w), wide frequency
response (good over 144mhz) RF amps from a repespected dealer in the UK. I
noticed they did not act or look like NOS Motorola ones, and he offered
to refund my money, saying he got them from a trusted dealer in the EU,
and they were well received by customers.

They had 2n5109 stenciled on the side, no other markings and the Motorla
ones had a sealed metal can, these were in a metal can, but had resin
on the bottom. They had 4 wires (one cut), the Motorola had 3.

I looked up the Chinese spec sheet for them and the Central Semiconductor
ones are not clearly shown to tell if they are metal or resin, but they
are not 2n5109's, they are a new "better" transistor (higher frequency
response, more gain) sold as the old ones. I wonder how many other numbers
these transistors get stamped on them.

The 2N5109 was used in CATV headend equipment, well past 300 MHz. I
replaced a few in an RCA (Design bought from EIE, then later sold to
Catel) headend with some intermittent spurs. They modulated at the IF
frequency, or converted an off air signal to IF, then used output
converters to put the signal on the desired channel. That was 30 years
ago, but I might still have a manual in my files.


--
Anyone wanting to run for any political office in the US should have to
have a DD214, and a honorable discharge.

---
This email is free from viruses and malware because avast! Antivirus protection is active.
http://www.avast.com

 

[Geoffrey S. Mendelson]

Michael A. Terrell wrote:

Do you really need 1A? The 78L09 is good to 100 mA, and is a lot
smaller.

Thanks, 100ma is a lot closer to what I need, does it shut down or current
limit when it is overloaded like the larger version, or is it damaged.

When the transistor goes into oscilation it draws a lot of current and
the idea is to prevent it from burning out other parts.


I bought the larger ones because they are more useful to me, and I have
a 4 to 6 week lead time from China. 2-3 week lead time from the UK, but
usually twice the price.

Geoff.

--
Geoffrey S. Mendelson, N3OWJ/4X1GM/KBUH7245/KBUW5379

 

[Michael A. Terrell]

"Geoffrey S. Mendelson" wrote:

Michael A. Terrell wrote:

The 2N5109 was used in CATV headend equipment, well past 300 MHz. I
replaced a few in an RCA (Design bought from EIE, then later sold to
Catel) headend with some intermittent spurs. They modulated at the IF
frequency, or converted an off air signal to IF, then used output
converters to put the signal on the desired channel. That was 30 years
ago, but I might still have a manual in my files.


I bought them to use in HF active antennas (PA0RDT type). Since then I have
found NOS 2n3866 work just as well at 1/5 the price along with 2N5179 and
BSX20 transistors. They are really there because they have a 50ohm output
impedance, and the smaller (2n5179/BSX20) transistors have a much smaller
chance of oscilatting and burning out.

I also found out the hard way that the PA0RDT design works ok at 9 volts,
better at 12 volts (noticably higher gain) and oscillates at 13.8 volts.
Next one will be built with a silicon rectifier string to drop the 13.8 to
12, unless the 7809's arrive from China.

I keep a lot of different regulators in stock, for projects. I used
to buy lots of dead C-band LNAs, LNbs and LNCs for a couple dollars
each. Most had a bad regulator, so I had around $1.50 in each repaired
item that sold for $30.

Do you really need 1A? The 78L09 is good to 100 mA, and is a lot
smaller.


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[Geoffrey S. Mendelson]

JW wrote:

It's on the first page of the datasheet.
http://www.fairchildsemi.com/ds/KA/KA78L09A.pdf

Yes it is. I found a datasheet with google, but this is a much better one.


Thank you very much, I appreciate it.

Geoff.

--
Geoffrey S. Mendelson, N3OWJ/4X1GM/KBUH7245/KBUW5379