WEITRON. C NPN Transistors. Lead(Pb)-Free. Pb . TO 1. 2. 3. 1. EMITTER. 2. COLLECTOR. 3. BASE. 1/4. Page 1 of 5. Tel: ()-TAITRON () () Fax: ()- TAITFAX () () SMD Transistor (NPN). SMD Transistor. C NPN Transistors. ELECTRICAL CHARACTERISTICS (TA=25 C unless otherwise noted) (Countinued) Characteristics Symbol Min Typ Max Unit.

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I’m trying to fix this little electronic toy. It’s really not much, 8 buttons, you push one, the lights go on, and a little melody plays. Now, I really don’t know much about this, but really wanna fix that toy: There is a single controller, splitting to two circuits, one for diode lights, and another one to a speaker.

The way it broke, as it’s there is no sound. There is a transistor or I think it is for each circuit. For each, one right leg is straight to the batteries, the second left leg is to the chip through a resistorand the third one middle is to the outlet from one it’s to the speaker and from another it’s to lights.

I was probing both the transistors to see what’s going on when a toy is “activated”. Dormant, controller leg has the same voltage that is coming from the battery, and the “out” leg has nothing on it.

When the button is pushed, the voltage on the controller leg drops a volt or so, and the “out” leg starts showing some for lights.


C Datasheet(PDF) – List of Unclassifed Manufacturers

The out leg that goes to the speaker doesn’t ever show any voltage, yet its leg that goes to the controller shows different voltage drops I assume that’s the controller “playing” music. I believe the transistor for the speaker circuit just broke IMO, sitting an hour in rain would do it.

But, the only things I see on this transistor again, I don’t know what is it, reallyare: C the first line, and P73C on the second line. There is absolutely no markings on this thing, and it has three legs and black solid body. It very much looks like this: Some of the answers I’ve got tell me this is 2SC, which is then, according to http: If so, and I were to order a replacement from, say RadioShack, how would I find one that would work? I was able to replace this transistor with 2N I should’ve been more careful picking the replacement that had the same order of pins, but hey, this was the cheapest one available.

Thank you for all your help, support, and explanations: It looks a lot like a 2SCwhose TO92 packaging matches the image you posted. By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies. Home Questions Tags Users Unanswered. C P73C Ask Question. Pawel Veselov 1 5. Renan 4, 2 21 Nearly all transistors that are labeled according to the Japanese standard JIS lack the leading “2S”.


Umm, you don’t think 2SC is a little high voltage for battery operated? Or I don’t understand what “LVceo: And what’s with the P73C part?

And also, how do I tell that it would open when the base-emitter voltage drops, not when it will be applied? You need to do some basic reading on transistor parameters. See here page one for LVceo and some other relevant terms.

All right, so just to settle LVceo – 50V min. LVceo means – the minimal collector-emitter voltage to cause a break down is 50V, right?

C945 Transistor

Then the spec for 2SC says: On the other hand, they say Vebo is 5V max I’m sorry, this is confusing: Pawel – Vebo – is the reverse base voltage, negative with respect to the emitter. This is always low, around 5V.

In most applications not relevant. You apply the 3V via a resistor which takes care of the voltage difference.

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