Pinout needed for TO-5 devices

[John Fields]

On Wed, 26 Nov 2003 18:50:46 -0800, Watson A.Name - "Watt Sun, Dark
Remover" <alondra101@hotmail.com> wrote:

In article <bec993c8.0311260938.4676d258@posting.google.com>,
shoppa@trailing-edge.com mentioned...
Watson A.Name - "Watt Sun, Dark Remover" <alondra101@hotmail.com> wrote in message news:<MPG.1a2a9d69d85948d98995e@news.dslextreme.com>...
In article <m31vrv8lo43f3pl8u588cv5h6jeban4to5@4ax.com>,
jfields@austininstruments.com mentioned...
The 1964 GE Transistor Manual has spec's for all three in case you need
to get equivalents, and "3" in their "Dwg.No." column corresponds to
TO-5. Unfortunately, they didn't list the package for the 2N326 but
it's rated for 7 watts so, clearly, it won't be in a TO-5 can. Much
less in a TO-92 package! I've scanned the page and I'll post it to
alt.binaries.schematics.electronic sometime today.

Well, the TO-39, which looks identical to the TO-5, will easily handle
7 watts, with a heatsink of course.

The datasheets from the 60's and 70's often have such nonsense in the
bold type at top. If you read down further you see that this spec only
applies if you keep the case at 25C... which given typical TO-5 heatsinks
means an ambient temp below -60C if the average dissipation is 7 watts
for even a fraction of a second. And that the measurements above
the half-watt level were made using pulse techniques.

I have only one thing to say. Read the 2N4036 data that I posted to
ABSe.

---
I did, a couple of times, and wondered why you didn't post the curve on
page 300 which, I'm sure, shows the power derating with elevating Tc and
Ta. Be that as it may, I'd be interested in seeing what you come up
with for a heat sink to allow the device (the transistor) to dissipate 7
watts continuously with a Ta of 25°C.

--
John Fields

 

[Neil Preston]

From the discussion, you probably won't find a data sheet that you can rely
on for these devices.

Assuming that it is a transistor and not an IC or other device, you can use
an ohmmeter to determine the pinout. If you use a digital multimeter, use
the 'diode test' function.

Connect the positive lead to any pin and check the other pins for low
resistance or low diode drop. Rotate the lead connections until you find a
connection where one pin has a low resistance to both of the other two.
That pin is the base lead. If it is the positive ohmmeter lead, the
transistor is NPN. If negative, it is PNP. Call that pin 2.

To determine emitter and collector, do a current gain test:
If it is an NPN transistor, connect the negative lead to pin 1 and the
positive lead to pin 3. Moisten the tip of your finger and touch it between
pin 2 (base) and pin 3. If you see a drop in resistance, pin 1 is most
likely the emitter and pin 3 is most likely the collector. (The moisture
path allows some trickle of base current from the positive meter lead and
turns on the transistor.) If you are not sure, reverse the connections to
pins 1 and 3 and repeat. The connection that gives the greatest drop in
resistance will have the pos lead on the collector and the neg lead on the
emitter.

If it was found to be a PNP transistor, reverse the polarity for the above.

Good luck....



"DaveC" <me@privacy.net> wrote in message
news:0001HW.BBE2FC9300F412ABF0080600@news.individual.net...

I'm looking for pinout data for 2N333, 2N336, and 2N324. All are stated as
being TO-5, a variant, AFAIK, of TO-92. All three of these are
discontinued
numbers.

When I check NTEINC.com for a cross, I get NTE123A in a different package:

http://www.nteinc.com/graphics/diag21a.gif

National Semi and some others came up blank re. package data.

Where can I find the original pinout for these 2N devices?

(Which raises a general question: are all pinouts for all TO-5 devices the
same?)

Thanks,
--
DaveC
me@privacy.net
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