Help finding datasheet for Motorola 2n2907a transistor

[Will]

Like the subject says, I have been tearing my hair out trying to find
a datasheet for Motorola's 2n2907a transistor. Alternatively, can
anyone out there tell me if it is acceptable in just about every
conceiveable case to substitute a Multicomp 2n2907a in its place? I
would assume that having the same name indicates some industry
standardization, but (forgive my ignorance) I am unsure. Thanks in
advance for any help!
-Will Hein

 

[Watson A.Name \"Watt Sun]

Will wrote:

Like the subject says, I have been tearing my hair out trying to find
a datasheet for Motorola's 2n2907a transistor. Alternatively, can
anyone out there tell me if it is acceptable in just about every
conceiveable case to substitute a Multicomp 2n2907a in its place? I
would assume that having the same name indicates some industry
standardization, but (forgive my ignorance) I am unsure. Thanks in
advance for any help!
-Will Hein

Any 2N2907A should work okay. But don't try to substitute a PN2907A
which is the same transistor in a plastic package. They are rated
considerably lower power.

The 2N2907A and just about any other transistor datasheet can be found
by googling:

2N2907A DATASHEET

and _do_not_ click on those idiotic chipdocs.com and
datasheetcatalog.com sites, which make you go thru hoops to get one, or
even charge you for it. Skip down to the makers such as Motorola,
Fairchild, or Philips, etc. Also DialElec in UK has some unusual
datasheets for some of the Japanese or other transistors for free.

 

[Mark (UK)]

I don't usually do this moan, but come on...... It took me 2 seconds to
find it using Google...

http://www.qsl.net/n4xy/PDFs/Semiconductor_Data_Sheets/2n2907a.pdf

Were you bald before you started

Yours, Mark.

Will wrote:

Like the subject says, I have been tearing my hair out trying to find
a datasheet for Motorola's 2n2907a transistor. Alternatively, can
anyone out there tell me if it is acceptable in just about every
conceiveable case to substitute a Multicomp 2n2907a in its place? I
would assume that having the same name indicates some industry
standardization, but (forgive my ignorance) I am unsure. Thanks in
advance for any help!
-Will Hein

 

[Christopher]

"Watson A.Name \"Watt Sun - the Dark Remover\"" <NOSPAM@dslextreme.com> wrote in message news:<c51u4h$6kds1$1@hades.csu.net>...

Will wrote:
Like the subject says, I have been tearing my hair out trying to find
a datasheet for Motorola's 2n2907a transistor. Alternatively, can
anyone out there tell me if it is acceptable in just about every
conceiveable case to substitute a Multicomp 2n2907a in its place? I
would assume that having the same name indicates some industry
standardization, but (forgive my ignorance) I am unsure. Thanks in
advance for any help!
-Will Hein

Any 2N2907A should work okay. But don't try to substitute a PN2907A
which is the same transistor in a plastic package. They are rated
considerably lower power.

The 2N2907A and just about any other transistor datasheet can be found
by googling:

2N2907A DATASHEET

and _do_not_ click on those idiotic chipdocs.com and
datasheetcatalog.com sites, which make you go thru hoops to get one, or
even charge you for it. Skip down to the makers such as Motorola,
Fairchild, or Philips, etc. Also DialElec in UK has some unusual
datasheets for some of the Japanese or other transistors for free.

We have upgraded there datasheet service formerly at dialelec.com with
355,000 datasheets. These are now avaiable from
http://www.datasheetarchive.com (and still free). We are also
currently in the process of scanning 1500 rare data books (from 1950 -
2004) that we have collected over the last 20 years.

Regards
Christopher

 

[Watson A.Name \"Watt Sun]

Christopher wrote:

"Watson A.Name \"Watt Sun - the Dark Remover\"" <NOSPAM@dslextreme.com> wrote in message news:<c51u4h$6kds1$1@hades.csu.net>...

[snip]

and _do_not_ click on those idiotic chipdocs.com and
datasheetcatalog.com sites, which make you go thru hoops to get one, or
even charge you for it. Skip down to the makers such as Motorola,
Fairchild, or Philips, etc. Also DialElec in UK has some unusual
datasheets for some of the Japanese or other transistors for free.

We have upgraded there datasheet service formerly at dialelec.com with
355,000 datasheets. These are now avaiable from
http://www.datasheetarchive.com (and still free). We are also
currently in the process of scanning 1500 rare data books (from 1950 -
2004) that we have collected over the last 20 years.

Does that mean they will be available as graphics, or as OCR'd text?
please explain. Thanks.

Regards
Christopher

 

[Chaos Master]

Qu0t1n a 31337 h4ck3r 14b3113d Watson A.Name "Watt Sun - the Dark Remover"
[NOSPAM@dslextreme.com]:

Does that mean they will be available as graphics, or as OCR'd text?
please explain. Thanks.

Some datasheets are available as graphics. Others seem to be typed into a text
editor and then converted to PDF.

[]s
--
_____ ___ Chaos MasterŽ
|\/\/\| Posting from Brazil
|/\/\/| MSN: wizard_of_yendor at hotmail.com
___|_____| irc.brasnet.org #XLinuxNews #POA

 

[Chaos Master]

Qu0t1n a 31337 h4ck3r 14b3113d Christopher [christopher@dialelec.com]:

We have upgraded there datasheet service formerly at dialelec.com with
355,000 datasheets. These are now avaiable from
http://www.datasheetarchive.com (and still free). We are also
currently in the process of scanning 1500 rare data books (from 1950 -
2004) that we have collected over the last 20 years.

Great site. Went to my bookmarks and to some friends that work on electronics.

All the best for you!

--
_____ ___ Chaos MasterŽ
|\/\/\| Posting from Brazil
|/\/\/| MSN: wizard_of_yendor at hotmail.com
___|_____| irc.brasnet.org #XLinuxNews #POA

 

[Will]

I don't usually do this moan, but come on...... It took me 2 seconds to
find it using Google...
http://www.qsl.net/n4xy/PDFs/Semiconductor_Data_Sheets/2n2907a.pdf
Were you bald before you started
Yours, Mark.

While I appreciate the speed of your reply, I have to point out that
not only did I already try Google (to no avail) but the datasheet you
provided is for Philips, not for Motorola. Please actaully read my
post and figure out what I am looking for before you assume I am
stupid. Or, as they say on /. "RTFA". The entire point fo my post
was to find out if MOTOROLA's transistor was identical to vendor X's.
If I look at a datasheet from Philips that tells me nothing helpful.
Cheers,
-Will

 

[Chaos Master]

Qu0t1n a 31337 h4ck3r 14b3113d Will [larkmore@aol.com]:

I don't usually do this moan, but come on...... It took me 2 seconds to
find it using Google...
http://www.qsl.net/n4xy/PDFs/Semiconductor_Data_Sheets/2n2907a.pdf
Were you bald before you started
Yours, Mark.

While I appreciate the speed of your reply, I have to point out that
not only did I already try Google (to no avail) but the datasheet you
provided is for Philips, not for Motorola. Please actaully read my
post and figure out what I am looking for before you assume I am
stupid. Or, as they say on /. "RTFA". The entire point fo my post
was to find out if MOTOROLA's transistor was identical to vendor X's.
If I look at a datasheet from Philips that tells me nothing helpful.

All 2N2907A's have, or are understood to have, the same ratings.


Found this easily by entering www.onsemi.com (the semiconductor' section of
Motorola) and searching for 2N2907A:

http://www.onsemi.com/site/products/summary/0,4450,P2N2907A,00.html
http://www.onsemi.com/pub/Collateral/P2N2907A-D.PDF

Does this makes you happier?

I don't know exactly about Motorola' part numbers, but P2N2907A is AFAIK equal
to 2N2907A.

[]s
--
_____ ___ Chaos MasterŽ
|\/\/\| Posting from Brazil
|/\/\/| MSN: wizard_of_yendor at hotmail.com
___|_____| irc.brasnet.org #XLinuxNews #POA

 

[Watson A.Name \"Watt Sun]

Will wrote:

I don't usually do this moan, but come on...... It took me 2 seconds to
find it using Google...
http://www.qsl.net/n4xy/PDFs/Semiconductor_Data_Sheets/2n2907a.pdf
Were you bald before you started
Yours, Mark.


While I appreciate the speed of your reply, I have to point out that
not only did I already try Google (to no avail) but the datasheet you
provided is for Philips, not for Motorola. Please actaully read my
post and figure out what I am looking for before you assume I am
stupid. Or, as they say on /. "RTFA". The entire point fo my post
was to find out if MOTOROLA's transistor was identical to vendor X's.
If I look at a datasheet from Philips that tells me nothing helpful.
Cheers,
-Will

No, it _is_ helpful. The 2N2907A is a JEDEC registered number, and as
such, the transistor should conform to its specifications in order to be
called a 2N2907A.

We may have already assumed.

 

[Watson A.Name \"Watt Sun]

Chaos Master wrote:

:

I don't usually do this moan, but come on...... It took me 2 seconds to
find it using Google...
http://www.qsl.net/n4xy/PDFs/Semiconductor_Data_Sheets/2n2907a.pdf
Were you bald before you started
Yours, Mark.

While I appreciate the speed of your reply, I have to point out that
not only did I already try Google (to no avail) but the datasheet you
provided is for Philips, not for Motorola. Please actaully read my
post and figure out what I am looking for before you assume I am
stupid. Or, as they say on /. "RTFA". The entire point fo my post
was to find out if MOTOROLA's transistor was identical to vendor X's.
If I look at a datasheet from Philips that tells me nothing helpful.

All 2N2907A's have, or are understood to have, the same ratings.

Found this easily by entering www.onsemi.com (the semiconductor' section of
Motorola) and searching for 2N2907A:

http://www.onsemi.com/site/products/summary/0,4450,P2N2907A,00.html
http://www.onsemi.com/pub/Collateral/P2N2907A-D.PDF

Does this makes you happier?

I don't know exactly about Motorola' part numbers, but P2N2907A is AFAIK equal
to 2N2907A.

No, it's not. The PN2907A Pd = 625 mW, the 2N2907A = 1800 mW, almost 3
times greater.

> > []s

 

[Dave Platt]

All 2N2907A's have, or are understood to have, the same ratings.

Same published maximums and ranges, yes. If the original circuit
isn't terribly sensitive to specific characteristics of the individual
transistor used, then I'd expect that any 2N2907A would be an
acceptable substitute (and probably quite a few other general-purpose
PNP switching transistors would serve acceptably, as well).

However, there are some caveats which make this less than an
absolute. Different manufacturers may use different variations of the
basic transistor process to make their "2N2907A" (or other)
transistors. This can result in some differences in transistor
behavior from one manufacturer to another (or even from one batch to
another) which may not be obvious from the data sheet.

There might be variations within a parameter's published range. For
example, if h(fe) was listed as being in the range of 50 to 500, with
a typical value of 150, then one manufacturer's parts might tend to
run down below 100 and another's up above 200. If f(t) is published
as a minimum of 20 MHz, one manufacturer's parts might be right down
at that limit, while another's might be up in the 100 MHz range.

Different circuits have different sensitivities to transistor
characteristics. It's not considered good practice to design a
circuit which depends heavily on certain parameters... but it does
happen sometimes. Equipment designers have been known to use circuits
which require parts with (e.g.) particular h(fe) ranges, or
particularly low noise levels, and then to hand-select or "bin" the
components that they buy and use only those whose specific
characteristics match the circuits' needs.

Certain transistors seem to be notorious for parameter variation. The
very popular 2N3055 power transistor seems to be one of those. The
published specs for this part number seem to be broad and forgiving,
which means that it's pretty easy for individual parts to meet the
spec. I've been told that manufacturers would sometimes do a run of
TO-3 power transistors intended to meet a much more demanding spec,
would test the individual dice, and any dice which failed to meet the
demanding spec were diverted from the line and were fabricated into
"2N3055" transistors for use in less-demanding circuits. One might
find that the f(t) of these transistors might be a lot higher than
would be the case of "2N3055" parts built using an older fabrication
technology, and this might result in VHF or UHF oscillations of
circuits designed to work with old, slow transistors.

Now, in the case of a 2N2907A, used in a switching-type circuit as the
transistor's specification would seem to suggest, I'd guess that any
manufacturer's part in the same case would probably work just fine. I
would not substitute one of the "P" plastic-cased parts into this
circuit unless I knew that the load being switched was well below the
power rating of the plastic part.

[As far as I can tell, ON Semiconductor is not making the metal-case
parts - this appears to be one part of the Motorola transistor line
they have abandoned. http://www.centralsemi.com/eol/index.aspx might
be one source for transistors which have been declared "end of life"
by their original manufacturers]

On the other hand, if the 2N2907A were being used as some sort of
linear or broadband or RF amplifier, then it'd probably be a good idea
to check the circuit carefully for stability and proper operation
after substituting, no matter whose part was used.

--
Dave Platt <dplatt@radagast.org> AE6EO
Hosting the Jade Warrior home page: http://www.radagast.org/jade-warrior
I do _not_ wish to receive unsolicited commercial email, and I will
boycott any company which has the gall to send me such ads!

 

[Watson A.Name \"Watt Sun]

Dave Platt wrote:

All 2N2907A's have, or are understood to have, the same ratings.

Same published maximums and ranges, yes. If the original circuit
isn't terribly sensitive to specific characteristics of the individual
transistor used, then I'd expect that any 2N2907A would be an
acceptable substitute (and probably quite a few other general-purpose
PNP switching transistors would serve acceptably, as well).

However, there are some caveats which make this less than an
absolute. Different manufacturers may use different variations of the
basic transistor process to make their "2N2907A" (or other)
transistors. This can result in some differences in transistor
behavior from one manufacturer to another (or even from one batch to
another) which may not be obvious from the data sheet.

Same for transistors using chips from the same wafer. The variations in
paramaters very from transistor to transistor, so even if there is a
diff between mfgrs, that could be caused by the spread of the selection
process used in grading them.

I strongly suspect that the major mfgrs such as Motorola just purchase a
month's worth of output from some asian manufacturer, and then have all
those transistors branded for their brand and part number(s). The asian
mfgr could be making a different chip than the last time the major
company bought them, so even tho they may say they're On Semi, for
instance, they may not be the same transistor chips that were used in a
previous batch.

There might be variations within a parameter's published range. For
example, if h(fe) was listed as being in the range of 50 to 500, with
a typical value of 150, then one manufacturer's parts might tend to
run down below 100 and another's up above 200.

But assuming that the batch of transistors has not been culled for some
parameter, then the batch should obey the standard statistical bell
curve. If not, then someone has pulled out the average parts in the
middle and left you with the stragglers on the ends.

If f(t) is published
as a minimum of 20 MHz, one manufacturer's parts might be right down
at that limit, while another's might be up in the 100 MHz range.

But as long as the specifications call for a min of only 20 MHz, then it
doesn't matter what the max is, as long as the parts meet the minimum.
To expect the parts to operate at a lot higher than their published
specs is the expectations of a clueless and unprofessional engineer /
designer.

[snip]