Found a stash of Motorola DPC202F. What is it? - Page 1
Forum section: electronics / projects

author: Yansi
author_rank: Super Contributor
timestamp: March 17, 2020, 05:01:13 pm
content: During a little cleanup I have found a stash of these Motorola DPC202F. Seems to be NPN transistors. But I could not find any datasheet for them. Likely custom labeled?

author: Yansi
author_rank: Super Contributor
timestamp: March 17, 2020, 06:13:09 pm
content: Well, from the date code it is 1974 so I wouldn't suspect germanium. (They are indeed silicon based).I have tried to measure Vcbo, but failed. I do not have currently a high voltage source on hand, but Vcbo seems to be way above 100V, as there was no current flow even at 100V, which is the maximum my PSUs will give combined.

author: Stray Electron
author_rank: Super Contributor
timestamp: March 17, 2020, 06:20:34 pm
content: Those look like pulls so they're probably of little resale value. Also given the date code there are much better parts available now.

author: duak
author_rank: Super Contributor
timestamp: March 17, 2020, 06:46:10 pm
content: Here's a tenuous connection:Look for 'DPC202' inhttps://archive.org/stream/bitsavers_decfieldSeceTechnicalManualDec74_38830089/1974_Field_Service_Technical_Manual_Dec74_djvu.txtHouse numbered version of 2N4233 or 2N3054 and were used in printers.These look like TO-66 cases. Since they are pulls, one source would be a printer driver assembly rendered for parts.

author: Yansi
author_rank: Super Contributor
timestamp: March 17, 2020, 06:50:07 pm
content: Well, I haven't said I want to sell them. That was you.I am just interested as what these may be. And sure, they are pulls.

author: Benta
author_rank: Super Contributor
timestamp: March 17, 2020, 06:51:00 pm
content: TO-66 cases. Custom labeling is very likely, Motorola used to do that a lot in those days.

author: Yansi
author_rank: Super Contributor
timestamp: March 17, 2020, 06:56:47 pm
content: Quote from: duak on March 17, 2020, 06:46:10 pmThanks, it seems you have nailed it, thanks. Likely a 2N4233, a 90V 3A NPN. Explains why nothing was happening still at 100V.So nothing interesting, really.

author: duak
author_rank: Super Contributor
timestamp: March 17, 2020, 06:59:41 pm
content: I used to work with DEC stuff integrating them into our systems and sort of remember a company called Dataproducts and one of their printers.https://en.wikipedia.org/wiki/DataproductsTheir symbol is familiar. Could DPC be an abbreviation for Data Products Company/Corporation? Coincidence? You decide!

author: ETITsynthesizer
author_rank: Contributor
timestamp: March 17, 2020, 08:34:23 pm
content: compare to the modern off the shelf TO-3 NPN herehttps://www.jameco.com/z/2N3055A-Major-Brands-IC-2N3055A-High-Power-Bipolar-Transistor-100-volt-15-amp-TO-3_211406.html

author: ArthurDent
author_rank: Super Contributor
timestamp: March 17, 2020, 09:02:38 pm
content: Back when the 2N3054 were used in power supplies to drive the 2N3055 pass transistors or alone where far less power was required.

author: Yansi
author_rank: Super Contributor
timestamp: March 18, 2020, 09:33:22 am
content: Quote from: ETITsynthesizer on March 17, 2020, 08:34:23 pmWhat for should I compare them?