looking for a transistor

Jamie wrote:

gleason@encompasserve.org wrote:

I need to switch some GE #44 lamps from a TTL output. #44 lamps are
6.3 volts
at 250 ma, so I'll need a transistor to do the real work.
Unfortunately, it's
just a hair too much power for one of the hundreds of surplus
2n2222's I keep
around to do almost everything else here. Can someone suggest a small,
cheap
available transistor that would be appropriate for this use?
--
Lee K. Gleason N5ZMR
Control-G Consultants
lee.gleason@comcast.net

where did you get the idea the 2222's can't handle that?
You need to saturate them,. They can handle 500 ma's so
said this PDF..

http://www.fairchildsemi.com/ds/PN/PN2222A.pdf

The trick is to saturate the bias so that very little
resistance effect is between the CE.


Those datashits are crap the way eveyone seems to misuse them.
Click to expand...
The original 2N2222 was made for *small* signal work, and a practical
max current of about 100mA.
And even at that current, there is a large Vce drop.
Forcing a beta of five or less to get a "low" Vce is not a reasonable
way to use a transistor.
 
In article <13nm4rtdmbl0l5d@corp.supernews.com>,
Robert Baer <robertbaer@localnet.com> wrote:

Those datashits are crap the way eveyone seems to misuse them.
The original 2N2222 was made for *small* signal work, and a practical
max current of about 100mA.
And even at that current, there is a large Vce drop.
Forcing a beta of five or less to get a "low" Vce is not a reasonable
way to use a transistor.
Click to expand...
The OP might look into the 2N2222's big brother, the 2N2219
(preferably the 2N2219A). According to a gent I know who did a lot of
solid-state design for GE some years back, the 2N2219 uses a die
similar to the 2N2222, but it's spec'ed as a medium-current switch and
as it's in a TO-39 can it has better heat dissipation capability than
the 2N2222. He described it as a "brutal" part - very useful for
driving lamps and relays.

One data sheet I have on it states an absolute-max of 800 mA collector
current, 800 mW with Tamb=25C (and absolute-max of 3 watts if you can
hold the case temperature to 25C), beta in the 150 mA collector-
current range is between 100 and 300, Vce saturates at around .3 volts
(all for the 2N2219A part).

Not modern, not elegant, but it has a long and honorable service
record. Dunno how easy they are to find these days... I bought a
whole bagful from a surplus dealer a couple of years ago.

--
Dave Platt <dplatt@radagast.org> AE6EO
Friends of 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!
 
"Robert Baer" <robertbaer@localnet.com> wrote in message
news:13nm4rtdmbl0l5d@corp.supernews.com...
Forcing a beta of five or less to get a "low" Vce is not a reasonable
way to use a transistor.
Click to expand...
So every HOT ever made isn't at all reasonable (hFE typ 2.5 to 5)?

:^)

Storage time sure goes to hell, though. Even fast HOTs are a couple
microseconds. ZTX651 is something like 800ns at beta = 10 (a good 10-20
times less than hFE at the same Ic).

At any rate, 2N2222 has a fat junction, and is specified for up to 500mA,
so there.

Tim

--
Deep Fryer: A very philosophical monk.
Website @ http://webpages.charter.net/dawill/tmoranwms
 
ChairmanOfTheBored wrote:

Eeyore wrote:
ChairmanOfTheBored wrote:
Fred Bloggs wrote:

Look here at figure 2:
http://www.fairchildsemi.com/ds/PN/PN2222A.pdf

What about the 2222s in the can?

It's the same die you bloody MORON.


Idiot! It is a well known FACT that a canned transistor can dissipate
more heat than an epoxy package because it can sink it better and faster.
Click to expand...
Not to free air it doesn't.

2N2222 Pd = 500 mW

PN2222 Pd = 625 mW


Otherwise, your CPU would be in plastic, idiot!
Click to expand...
AMD CPUs have been manufactured in an epoxy based package for years (organic
PGA).


I guarantee the canned device has different numbers.
Click to expand...
Yes, it's lower. Read the bloody datasheet !


I wouldn't expect a retard like you to understand, however.
Click to expand...
I wouldn't expect a retard like you to even begin to have a clue.

Graham
 
"GPE" <GPEnospam@cox.net> wrote in
news:IUyej.57604$Rw3.55123@newsfe06.phx:

As an alternative, you can also use logic level driven MOSFET's as
well -- something like the IRL510 would drive lots of lamps.
Click to expand...
Indeed, and power MOSFET's go very cheap in decent quantity on eBay at
times. So cheaply that it doesn't make sense not to take advantage...
 
John Popelish <jpopelish@rica.net> wrote in
news:1dqdnR4N2YlibOfanZ2dnUVZ_vqpnZ2d@comcast.com:

I'm a sucker for the Zetex low saturation TO-92 transistors,
but they are not very cheap and made by no one else. But
drool over this data sheet:

http://www.zetex.com/3.0/pdf/ZTX1047A.pdf
Click to expand...
Cool, someone mentions Zetex. They do seem to have a uniquely strong spec
for such small transistors. Even the tiny e-line thingers make some TO92
types look clumsy. Maybe the small size radiates heat better, less bulk to
seep through the way it must out of a TO92. For switching though, I'd still
prefer MOSFETs. Many will have VERY low RDS with a 5V gate input.
 
Dave Platt wrote:
In article <13nm4rtdmbl0l5d@corp.supernews.com>,
Robert Baer <robertbaer@localnet.com> wrote:


Those datashits are crap the way eveyone seems to misuse them.
The original 2N2222 was made for *small* signal work, and a practical
max current of about 100mA.
And even at that current, there is a large Vce drop.
Forcing a beta of five or less to get a "low" Vce is not a reasonable
way to use a transistor.


The OP might look into the 2N2222's big brother, the 2N2219
(preferably the 2N2219A). According to a gent I know who did a lot of
solid-state design for GE some years back, the 2N2219 uses a die
similar to the 2N2222, but it's spec'ed as a medium-current switch and
as it's in a TO-39 can it has better heat dissipation capability than
the 2N2222. He described it as a "brutal" part - very useful for
driving lamps and relays.

One data sheet I have on it states an absolute-max of 800 mA collector
current, 800 mW with Tamb=25C (and absolute-max of 3 watts if you can
hold the case temperature to 25C), beta in the 150 mA collector-
current range is between 100 and 300, Vce saturates at around .3 volts
(all for the 2N2219A part).

Not modern, not elegant, but it has a long and honorable service
record. Dunno how easy they are to find these days... I bought a
whole bagful from a surplus dealer a couple of years ago.
Click to expand...
Makes no sense to use a pricey TO-39, there are now things like TIP30 in
TO-220, with specified SOA to handle his lamp turn-on surge, and the
bigger package means no heatsink required. Also, that one has Hfe nearly
100 typically at 250mA steady state, meaning he can drive it with any
TTL gate.
 
Lostgallifreyan wrote:

Cool, someone mentions Zetex. They do seem to have a uniquely strong spec
for such small transistors. Even the tiny e-line thingers make some TO92
types look clumsy. Maybe the small size radiates heat better, less bulk to
seep through the way it must out of a TO92.
(snip)
Click to expand...

It has almost nothing to do with radiation, and everything
to do with conduction. The E-line has a copper lead frame,
with an over sized collector mounting flag that allows short
leads to large copper traces to carry away more heat.
http://www.zetex.com/3.0/appnotes/apps/an4.pdf
--
Regards,

John Popelish
 
On Wed, 02 Jan 2008 10:26:53 -0500, Fred Bloggs <nospam@nospam.com>
wrote:

Dave Platt wrote:
In article <13nm4rtdmbl0l5d@corp.supernews.com>,
Robert Baer <robertbaer@localnet.com> wrote:


Those datashits are crap the way eveyone seems to misuse them.
The original 2N2222 was made for *small* signal work, and a practical
max current of about 100mA.
And even at that current, there is a large Vce drop.
Forcing a beta of five or less to get a "low" Vce is not a reasonable
way to use a transistor.


The OP might look into the 2N2222's big brother, the 2N2219
(preferably the 2N2219A). According to a gent I know who did a lot of
solid-state design for GE some years back, the 2N2219 uses a die
similar to the 2N2222, but it's spec'ed as a medium-current switch and
as it's in a TO-39 can it has better heat dissipation capability than
the 2N2222. He described it as a "brutal" part - very useful for
driving lamps and relays.

One data sheet I have on it states an absolute-max of 800 mA collector
current, 800 mW with Tamb=25C (and absolute-max of 3 watts if you can
hold the case temperature to 25C), beta in the 150 mA collector-
current range is between 100 and 300, Vce saturates at around .3 volts
(all for the 2N2219A part).

Not modern, not elegant, but it has a long and honorable service
record. Dunno how easy they are to find these days... I bought a
whole bagful from a surplus dealer a couple of years ago.


Makes no sense to use a pricey TO-39, there are now things like TIP30 in
TO-220, with specified SOA to handle his lamp turn-on surge, and the
bigger package means no heatsink required. Also, that one has Hfe nearly
100 typically at 250mA steady state, meaning he can drive it with any
TTL gate.
Click to expand...
Or, if your nostalgia for the eighties is limited, use something like
this modern 37-cent part:

http://www.onsemi.com/pub/Collateral/NTR4501N-D.PDF


Best regards,
Spehro Pefhany
--
"it's the network..." "The Journey is the reward"
speff@interlog.com Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog Info for designers: http://www.speff.com
 
Spehro Pefhany wrote:
On Wed, 02 Jan 2008 10:26:53 -0500, Fred Bloggs <nospam@nospam.com
wrote:



Dave Platt wrote:

In article <13nm4rtdmbl0l5d@corp.supernews.com>,
Robert Baer <robertbaer@localnet.com> wrote:



Those datashits are crap the way eveyone seems to misuse them.
The original 2N2222 was made for *small* signal work, and a practical
max current of about 100mA.
And even at that current, there is a large Vce drop.
Forcing a beta of five or less to get a "low" Vce is not a reasonable
way to use a transistor.


The OP might look into the 2N2222's big brother, the 2N2219
(preferably the 2N2219A). According to a gent I know who did a lot of
solid-state design for GE some years back, the 2N2219 uses a die
similar to the 2N2222, but it's spec'ed as a medium-current switch and
as it's in a TO-39 can it has better heat dissipation capability than
the 2N2222. He described it as a "brutal" part - very useful for
driving lamps and relays.

One data sheet I have on it states an absolute-max of 800 mA collector
current, 800 mW with Tamb=25C (and absolute-max of 3 watts if you can
hold the case temperature to 25C), beta in the 150 mA collector-
current range is between 100 and 300, Vce saturates at around .3 volts
(all for the 2N2219A part).

Not modern, not elegant, but it has a long and honorable service
record. Dunno how easy they are to find these days... I bought a
whole bagful from a surplus dealer a couple of years ago.


Makes no sense to use a pricey TO-39, there are now things like TIP30 in
TO-220, with specified SOA to handle his lamp turn-on surge, and the
bigger package means no heatsink required. Also, that one has Hfe nearly
100 typically at 250mA steady state, meaning he can drive it with any
TTL gate.


Or, if your nostalgia for the eighties is limited, use something like
this modern 37-cent part:

http://www.onsemi.com/pub/Collateral/NTR4501N-D.PDF


Best regards,
Spehro Pefhany
Click to expand...
Hmmmm, would not want that low threshold 0.65V thing around bipolar TTL,
may burn up on turn-off.
 
gleason@encompasserve.org wrote:
I need to switch some GE #44 lamps from a TTL output. #44 lamps are
6.3 volts at 250 ma, so I'll need a transistor to do the real work.
Unfortunately, it's just a hair too much power for one of the
hundreds of surplus 2n2222's I keep around to do almost everything
else here. Can someone suggest a small, cheap available transistor
that would be appropriate for this use?
Click to expand...
2n4401 is rated at 600mA continuous.
 
Spehro Pefhany wrote:
On Wed, 02 Jan 2008 10:26:53 -0500, Fred Bloggs <nospam@nospam.com
wrote:


Dave Platt wrote:
In article <13nm4rtdmbl0l5d@corp.supernews.com>,
Robert Baer <robertbaer@localnet.com> wrote:


Those datashits are crap the way eveyone seems to misuse them.
The original 2N2222 was made for *small* signal work, and a practical
max current of about 100mA.
And even at that current, there is a large Vce drop.
Forcing a beta of five or less to get a "low" Vce is not a reasonable
way to use a transistor.

The OP might look into the 2N2222's big brother, the 2N2219
(preferably the 2N2219A). According to a gent I know who did a lot of
solid-state design for GE some years back, the 2N2219 uses a die
similar to the 2N2222, but it's spec'ed as a medium-current switch and
as it's in a TO-39 can it has better heat dissipation capability than
the 2N2222. He described it as a "brutal" part - very useful for
driving lamps and relays.

One data sheet I have on it states an absolute-max of 800 mA collector
current, 800 mW with Tamb=25C (and absolute-max of 3 watts if you can
hold the case temperature to 25C), beta in the 150 mA collector-
current range is between 100 and 300, Vce saturates at around .3 volts
(all for the 2N2219A part).

Not modern, not elegant, but it has a long and honorable service
record. Dunno how easy they are to find these days... I bought a
whole bagful from a surplus dealer a couple of years ago.

Makes no sense to use a pricey TO-39, there are now things like TIP30 in
TO-220, with specified SOA to handle his lamp turn-on surge, and the
bigger package means no heatsink required. Also, that one has Hfe nearly
100 typically at 250mA steady state, meaning he can drive it with any
TTL gate.

Or, if your nostalgia for the eighties is limited, use something like
this modern 37-cent part:

http://www.onsemi.com/pub/Collateral/NTR4501N-D.PDF
Click to expand...
Can be had for under 15c and is even 3.3V logic compliant. Nice part.

--
Regards, Joerg

http://www.analogconsultants.com/
 
Fred Bloggs wrote:
Spehro Pefhany wrote:
On Wed, 02 Jan 2008 10:26:53 -0500, Fred Bloggs <nospam@nospam.com
wrote:



Dave Platt wrote:

In article <13nm4rtdmbl0l5d@corp.supernews.com>,
Robert Baer <robertbaer@localnet.com> wrote:



Those datashits are crap the way eveyone seems to misuse them.
The original 2N2222 was made for *small* signal work, and a
practical max current of about 100mA.
And even at that current, there is a large Vce drop.
Forcing a beta of five or less to get a "low" Vce is not a
reasonable way to use a transistor.


The OP might look into the 2N2222's big brother, the 2N2219
(preferably the 2N2219A). According to a gent I know who did a lot of
solid-state design for GE some years back, the 2N2219 uses a die
similar to the 2N2222, but it's spec'ed as a medium-current switch and
as it's in a TO-39 can it has better heat dissipation capability than
the 2N2222. He described it as a "brutal" part - very useful for
driving lamps and relays.

One data sheet I have on it states an absolute-max of 800 mA collector
current, 800 mW with Tamb=25C (and absolute-max of 3 watts if you can
hold the case temperature to 25C), beta in the 150 mA collector-
current range is between 100 and 300, Vce saturates at around .3 volts
(all for the 2N2219A part).

Not modern, not elegant, but it has a long and honorable service
record. Dunno how easy they are to find these days... I bought a
whole bagful from a surplus dealer a couple of years ago.


Makes no sense to use a pricey TO-39, there are now things like TIP30
in TO-220, with specified SOA to handle his lamp turn-on surge, and
the bigger package means no heatsink required. Also, that one has Hfe
nearly 100 typically at 250mA steady state, meaning he can drive it
with any TTL gate.


Or, if your nostalgia for the eighties is limited, use something like
this modern 37-cent part:
http://www.onsemi.com/pub/Collateral/NTR4501N-D.PDF


Best regards, Spehro Pefhany

Hmmmm, would not want that low threshold 0.65V thing around bipolar TTL,
may burn up on turn-off.
Click to expand...
Thou shalt not drive that with old bipolar TTL Chips. CMOS rulez.

--
Regards, Joerg

http://www.analogconsultants.com/
 
On Wed, 02 Jan 2008 12:23:18 -0500, Fred Bloggs <nospam@nospam.com>
wrote:

Spehro Pefhany wrote:
On Wed, 02 Jan 2008 10:26:53 -0500, Fred Bloggs <nospam@nospam.com
wrote:



Dave Platt wrote:

In article <13nm4rtdmbl0l5d@corp.supernews.com>,
Robert Baer <robertbaer@localnet.com> wrote:



Those datashits are crap the way eveyone seems to misuse them.
The original 2N2222 was made for *small* signal work, and a practical
max current of about 100mA.
And even at that current, there is a large Vce drop.
Forcing a beta of five or less to get a "low" Vce is not a reasonable
way to use a transistor.


The OP might look into the 2N2222's big brother, the 2N2219
(preferably the 2N2219A). According to a gent I know who did a lot of
solid-state design for GE some years back, the 2N2219 uses a die
similar to the 2N2222, but it's spec'ed as a medium-current switch and
as it's in a TO-39 can it has better heat dissipation capability than
the 2N2222. He described it as a "brutal" part - very useful for
driving lamps and relays.

One data sheet I have on it states an absolute-max of 800 mA collector
current, 800 mW with Tamb=25C (and absolute-max of 3 watts if you can
hold the case temperature to 25C), beta in the 150 mA collector-
current range is between 100 and 300, Vce saturates at around .3 volts
(all for the 2N2219A part).

Not modern, not elegant, but it has a long and honorable service
record. Dunno how easy they are to find these days... I bought a
whole bagful from a surplus dealer a couple of years ago.


Makes no sense to use a pricey TO-39, there are now things like TIP30 in
TO-220, with specified SOA to handle his lamp turn-on surge, and the
bigger package means no heatsink required. Also, that one has Hfe nearly
100 typically at 250mA steady state, meaning he can drive it with any
TTL gate.


Or, if your nostalgia for the eighties is limited, use something like
this modern 37-cent part:

http://www.onsemi.com/pub/Collateral/NTR4501N-D.PDF


Best regards,
Spehro Pefhany

Hmmmm, would not want that low threshold 0.65V thing around bipolar TTL,
may burn up on turn-off.
Click to expand...
Around bipolar TTL? <checks calendar> whew, 2008, not 1982.. ;-)


Best regards,
Spehro Pefhany
--
"it's the network..." "The Journey is the reward"
speff@interlog.com Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog Info for designers: http://www.speff.com
 
Spehro Pefhany wrote:
On Wed, 02 Jan 2008 12:23:18 -0500, Fred Bloggs <nospam@nospam.com
wrote:


Spehro Pefhany wrote:
On Wed, 02 Jan 2008 10:26:53 -0500, Fred Bloggs <nospam@nospam.com
wrote:


Dave Platt wrote:

In article <13nm4rtdmbl0l5d@corp.supernews.com>,
Robert Baer <robertbaer@localnet.com> wrote:



Those datashits are crap the way eveyone seems to misuse them.
The original 2N2222 was made for *small* signal work, and a practical
max current of about 100mA.
And even at that current, there is a large Vce drop.
Forcing a beta of five or less to get a "low" Vce is not a reasonable
way to use a transistor.

The OP might look into the 2N2222's big brother, the 2N2219
(preferably the 2N2219A). According to a gent I know who did a lot of
solid-state design for GE some years back, the 2N2219 uses a die
similar to the 2N2222, but it's spec'ed as a medium-current switch and
as it's in a TO-39 can it has better heat dissipation capability than
the 2N2222. He described it as a "brutal" part - very useful for
driving lamps and relays.

One data sheet I have on it states an absolute-max of 800 mA collector
current, 800 mW with Tamb=25C (and absolute-max of 3 watts if you can
hold the case temperature to 25C), beta in the 150 mA collector-
current range is between 100 and 300, Vce saturates at around .3 volts
(all for the 2N2219A part).

Not modern, not elegant, but it has a long and honorable service
record. Dunno how easy they are to find these days... I bought a
whole bagful from a surplus dealer a couple of years ago.

Makes no sense to use a pricey TO-39, there are now things like TIP30 in
TO-220, with specified SOA to handle his lamp turn-on surge, and the
bigger package means no heatsink required. Also, that one has Hfe nearly
100 typically at 250mA steady state, meaning he can drive it with any
TTL gate.

Or, if your nostalgia for the eighties is limited, use something like
this modern 37-cent part:

http://www.onsemi.com/pub/Collateral/NTR4501N-D.PDF


Best regards,
Spehro Pefhany
Hmmmm, would not want that low threshold 0.65V thing around bipolar TTL,
may burn up on turn-off.

Around bipolar TTL? <checks calendar> whew, 2008, not 1982.. ;-)
Click to expand...
Don't know if this ever made it to America: Siemens had artificially
slowed logic chips, called "langsame stoersichere Logik" or slow and
interference-insensitive logic devices. Those could make for some
spectacular SOA burn-outs. Seriously, I had to debug designs where they
drove transistors directly. Phsssst ... BANG.

--
Regards, Joerg

http://www.analogconsultants.com/
 
On Wed, 02 Jan 2008 11:20:44 -0800, Joerg
<notthisjoergsch@removethispacbell.net> wrote:

Spehro Pefhany wrote:
On Wed, 02 Jan 2008 12:23:18 -0500, Fred Bloggs <nospam@nospam.com
wrote:


Spehro Pefhany wrote:
On Wed, 02 Jan 2008 10:26:53 -0500, Fred Bloggs <nospam@nospam.com
wrote:


Dave Platt wrote:

In article <13nm4rtdmbl0l5d@corp.supernews.com>,
Robert Baer <robertbaer@localnet.com> wrote:



Those datashits are crap the way eveyone seems to misuse them.
The original 2N2222 was made for *small* signal work, and a practical
max current of about 100mA.
And even at that current, there is a large Vce drop.
Forcing a beta of five or less to get a "low" Vce is not a reasonable
way to use a transistor.

The OP might look into the 2N2222's big brother, the 2N2219
(preferably the 2N2219A). According to a gent I know who did a lot of
solid-state design for GE some years back, the 2N2219 uses a die
similar to the 2N2222, but it's spec'ed as a medium-current switch and
as it's in a TO-39 can it has better heat dissipation capability than
the 2N2222. He described it as a "brutal" part - very useful for
driving lamps and relays.

One data sheet I have on it states an absolute-max of 800 mA collector
current, 800 mW with Tamb=25C (and absolute-max of 3 watts if you can
hold the case temperature to 25C), beta in the 150 mA collector-
current range is between 100 and 300, Vce saturates at around .3 volts
(all for the 2N2219A part).

Not modern, not elegant, but it has a long and honorable service
record. Dunno how easy they are to find these days... I bought a
whole bagful from a surplus dealer a couple of years ago.

Makes no sense to use a pricey TO-39, there are now things like TIP30 in
TO-220, with specified SOA to handle his lamp turn-on surge, and the
bigger package means no heatsink required. Also, that one has Hfe nearly
100 typically at 250mA steady state, meaning he can drive it with any
TTL gate.

Or, if your nostalgia for the eighties is limited, use something like
this modern 37-cent part:

http://www.onsemi.com/pub/Collateral/NTR4501N-D.PDF


Best regards,
Spehro Pefhany
Hmmmm, would not want that low threshold 0.65V thing around bipolar TTL,
may burn up on turn-off.

Around bipolar TTL? <checks calendar> whew, 2008, not 1982.. ;-)


Don't know if this ever made it to America: Siemens had artificially
slowed logic chips, called "langsame stoersichere Logik" or slow and
interference-insensitive logic devices. Those could make for some
spectacular SOA burn-outs. Seriously, I had to debug designs where they
drove transistors directly. Phsssst ... BANG.
Click to expand...

Was that like HNIL? Power-hungry, 15V (?), very tough devices.

Best regards,
Spehro Pefhany
--
"it's the network..." "The Journey is the reward"
speff@interlog.com Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog Info for designers: http://www.speff.com
 
Spehro Pefhany wrote:

Fred Bloggs wrote:

Hmmmm, would not want that low threshold 0.65V thing around bipolar TTL,
may burn up on turn-off.

Around bipolar TTL? <checks calendar> whew, 2008, not 1982.. ;-)
Click to expand...
That was my thinking too.

Maybe Fred has lot of 'surplus' parts ?

Graham
 
On Wed, 02 Jan 2008 21:48:22 +0000, Eeyore
<rabbitsfriendsandrelations@hotmail.com> wrote:

Spehro Pefhany wrote:

Fred Bloggs wrote:

Hmmmm, would not want that low threshold 0.65V thing around bipolar TTL,
may burn up on turn-off.

Around bipolar TTL? <checks calendar> whew, 2008, not 1982.. ;-)

That was my thinking too.

Maybe Fred has lot of 'surplus' parts ?

Graham
Click to expand...
Nah, he just likes to be right. Unlike the rest of us here. ;-)

Best regards,
Spehro Pefhany
--
"it's the network..." "The Journey is the reward"
speff@interlog.com Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog Info for designers: http://www.speff.com
 
PhattyMo wrote:

Eeyore wrote:
ChairmanOfTheBored wrote:
Eeyore wrote:
Robert Baer wrote:
Tim Williams wrote:

At any rate, 2N2222 has a fat junction, and is specified for up to 500mA,
so there.
No it is not; original spec was in the 100mA region, and we have
idiots wanting them to act like perfect switches up to two amps.
WHY people want to continue using such an ancient device perplexes me.
The 2N2222 is one of the most widely used, most reliable small signal
transistors ever made... dipshit.

By IDIOTS for sure.

I've not found one ONCE even in any mass produced kit.

WTF? I run across them all the time.. *shrug*
Click to expand...
METAL CAN 2N2222s ? The metal can is part of the JEDEC spec for the part. It's not
optional. Do you mean plastic encapsulated PN2222s ? I still wouldn't use those
because beta is quite low compared to modern parts.

Graham
 
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