(Topic ID: 202884)

Light and SCR question Special Force

By Wisker

6 years ago


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  • 28 posts
  • 6 Pinsiders participating
  • Latest reply 6 years ago by noflip95
  • Topic is favorited by 1 Pinsider

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#3 6 years ago
Quoted from Wisker:

... located the transistor for 3 of them which used the 2n560 transistor and one used the MCR 106 transistor ... So it seems that the new 2n560-730 has different input and output leg. Is that correct do they make more than one 2n560 is might be my issue?

Hi,
Are you sure, that your components are the right ones ?
The driver board doesn't use transistors but thyristors (SCR - PNPN). The board use both 2N5060 and MCR 106, depending on the power needed (2N5060 can drive about 1A, and MCR 106 cand drive about 4A).

For the MCR 106, OK, it's a TO-225AA case, the new component works.
2017-11-17_10h42_56 (resized).png2017-11-17_10h42_56 (resized).png

For the 2N5060, the case is a TO-92, and there is no pining variation.
facing the flat side, from left to righ, you have Cathode, Gate and Anode.
2017-11-17_10h43_19 (resized).png2017-11-17_10h43_19 (resized).png

Be sure that your component is not a 2N560 transistor ! this one has a similar case, but it's a transistor (NPN), not a thyristor (NPNP).
The 2N560 can't replace the 2N5060 !

2 weeks later
#28 6 years ago
Quoted from wxforecaster:

Resolved: After doing some testing, I found that the 703 lot of these SCRs must've been shipped with a factory error (or someone fell asleep at the switch). Instead of it being Cathode, Gate, Anode from left to right (flat facing you) as per the existing SCRs and datasheet, this lot is Gate, Anode, Cathode. Flipping the SCR around and manipulating the legs, I was able to get them working.

It's rare, but I've seen this kind of curiosity, even buying new components from reputable serious sellers: I have, for example, a batch of LEDs where the anode and the cathode are totally reversed, and a 6810 RAM in a DIP-40 package (never manufactured according to the datasheet) !
Normally, these components should be rejected by quality control and put in the trash. But I have the impression that this is not always the case!

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