Anyone know this part? - unknown transistor / fet maybe? - Page 1
Forum section: electronics / general

author: innkeeper
author_rank: Unknown
timestamp: September 22, 2017, 03:21:51 am
content: So a funny thing happened to me at the 'flea at MIT' , i came home with something i cant identify. - ok probably not that big a surprise.but how could i pass up a bag of transistor looking devices thrown into a deal.these are marked 8470-1GE (or maybe its 'ige' or LGE) - see picsthe transistor tester definitely isn't identifying these right, - hfe of 13k? its doubtful these are BJT transistors.i literally have a bag of 1000's of these, maybe even 10,000 hard to judge. it be nice to identify them, otherwise there just gonna be trash.so far my internet searches have come up empty. maybe its some company specific part number.anyone have any ideas.

author: ataradov
author_rank: Super Contributor
timestamp: September 22, 2017, 04:07:36 am
content: Can they be darlington transistors?Open one up and see how it look on the inside.Also, assume this tester is correct, and use one as a transistor in a circuit, and see what happens.And I bet they are worthless, regardless of what they are. They may contain some precious metals, so they may be worth something as scrap.

author: innkeeper
author_rank: Unknown
timestamp: September 22, 2017, 05:13:13 am
content: hmm, didn't think of them being Darlington'syea not like trying to make money off them, heck id be happy if there useful, id hand them out like candy lol.

author: innkeeper
author_rank: Unknown
timestamp: September 22, 2017, 05:58:24 am
content: the insides as best i could get

author: capt bullshot
author_rank: Super Contributor
timestamp: September 22, 2017, 06:50:11 am
content: My guess:old germanium transistor manfactured by General ElectricI wouldn't trust the tester here. You may want to check them using the "conventional" method (diode tester from multimeter), see what the real Vbe is.

author: amyk
author_rank: Super Contributor
timestamp: September 22, 2017, 07:35:52 am
content: http://www.semicon-data.com/transistor/tc/d0/D16P1.html

author: David Hess
author_rank: Super Contributor
timestamp: September 22, 2017, 09:21:11 am
content: Quote from: amyk on September 22, 2017, 07:35:52 amHow did you get from 8470-1GE to D16P1? I got as far as my GE transistor databook and saw that part number but could connect it.

author: innkeeper
author_rank: Unknown
timestamp: September 22, 2017, 06:55:53 pm
content: Quote from: capt bullshot on September 22, 2017, 06:50:11 amSo i am getting .6v and 1.2v .. so, assuming .6 is Vbc and 1.2v is Vbe maybe this is a darlington. Base is on the end not the center pin.so E C B

author: T3sl4co1l
author_rank: Super Contributor
timestamp: September 22, 2017, 07:24:36 pm
content: Quote from: David Hess on September 22, 2017, 09:21:11 amGuessing he knows the number offhand, or found one similar enough?BJTs (and Darlingtons) aren't very special, from part to part, so it's not a big deal on the whole.Anyway, the only missing data are Vceo, Ccb and Cbe, and fT. Most of which the above data doesn't have either. Easy enough to measure: test Vceo like a zener diode (use a small current from a high voltage, and measure breakdown between C and B), and test dynamic behavior with an amplifier or switch circuit.I'd done the same series of tests on a house marked power transistor I have a bag of, which show it's somewhere between TIP31C and MJE15010 or thereabouts. Too bad I don't need power transistors that often.Tim

author: innkeeper
author_rank: Unknown
timestamp: September 22, 2017, 07:38:40 pm
content: Quote from: amyk on September 22, 2017, 07:35:52 amThat does fit what i am seeing so far..how did you make the cross reference!!!I couldn't find a complete GE pdf sheet on this except in an old ge handbook pdfso excuse the pics.be nice to find a use for thesepre-amps anyone?

author: innkeeper
author_rank: Unknown
timestamp: September 22, 2017, 07:53:09 pm
content: Quote from: T3sl4co1l on September 22, 2017, 07:24:36 pmStill be cool to know even if it was off the top of his headseems like a house number. .. i always wonder if there is some story on who they were made for.maybe there for spy satellitesactually i shouldn't joke, i got some misc components that all turned out to be spec'ed out for satellite usage - go figure. - .1uf caps for example individually wrapped in ther own protective plastic anti-static cases... i kid you not. and some 1uf caps with ESR's so low i thought my meter was broken with ridiculous operating temperatures..i've been falling into bag loads of surplus components recently. Way more parts then id ever use in my lifetime.funny when your searching for them you cant find such things and when your not they fall in your lap.i need to find someone to trade surplus parts with in my area.

author: Brumby
author_rank: Unknown
timestamp: September 23, 2017, 05:47:20 am
content: Quote from: innkeeper on September 22, 2017, 07:53:09 pmIf you feel comfortable doing so, you could always offer your zip code here. You might have someone close by from the forum, but don't know it.

author: innkeeper
author_rank: Unknown
timestamp: September 24, 2017, 03:44:14 am
content: that is not a bad idea, i'll ahve to get some kind of rough inventory oif what i've got.probably better on it's own thread

author: BrianHG
author_rank: Super Contributor
timestamp: September 24, 2017, 03:50:40 am
content: if you were in my area 2 years ago when I sold my house, I would have had a free truck load of electronics and bench tools you could have had for free...Dumpster divers in my neighborhood were scavenging my trash pile for a month as I emptied out my basement lab...

author: David Hess
author_rank: Super Contributor
timestamp: September 24, 2017, 03:57:04 am
content: Quote from: innkeeper on September 22, 2017, 07:53:09 pmIf you participate in the right circles, these kinds of things are pretty common. Like I have a few thousand germanium 1N270s on a roll which came from a satellite receiver company and trays, tubes, or bags of various semiconductors like TO-3 MOSFETs, TO-3 Darlingtons, TO-220 LM337s, DIP LM11s and LM833s, etc. I finally had to bag about 1000 1N270s and cut the inner part of the roll into strips because the glue was failing.

author: amyk
author_rank: Super Contributor
timestamp: September 24, 2017, 05:02:55 pm
content: It's the only TO-98 darlington from GE which matches those characteristics. The part may also be marked around the base of the package.

author: David Hess
author_rank: Super Contributor
timestamp: September 24, 2017, 05:15:07 pm
content: Quote from: amyk on September 24, 2017, 05:02:55 pmThe newer molded epoxy TO-98 packages were marked around the base but I do not remember the older epoxy filled TO-98 metal cans like these being marked that way. I have a whole GE prototyping kit with the newer TO-98 parts somewhere but only a couple of the older TO-98 parts.

author: innkeeper
author_rank: Unknown
timestamp: September 24, 2017, 10:00:01 pm
content: These are epoxy... No metal canNo markings around the base like I see in pictures of similar GE parts

author: tuchap
author_rank: Newbie
timestamp: March 07, 2020, 05:53:03 pm
content: HiI reopen this topic, because I'm looking for D16P1 transistors. If you still have some of them, I'm interested in buying a small quantity.thank you,Patrick