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From the Q&A

With TJ Byers


Free Power Transistors

Question:

 I am working on some projects that need power drivers. I have a bunch of NPN Darlington arrays that I have salvaged from old dot matrix printers, but I don't have the pinouts or voltage/current ratings for these devices. Here are a couple of the more popular numbers: FT5761 and MP4501. There is also an MTA001 that appears to have nine Darlingtons in it. Any help would be much appreciated.

Bill Mayhar
via Internet


Answer:

These are very interesting, versatile, and free devices that can be used in a wide variety of experiments and applications. As a rule, the transistors (Darlington, all) are rated three amps at 100 volts, with a gain of about 2000. Here are the pinouts for the MP4501; the pinouts are almost identical for similar devices.


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