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What type of voltage adtasheet circuit is this? Sign up or log in Sign up using Google. This is from BC datasheet: Adding schematic to show what I mean: BC hFE from to This is being used in a flyback circuit, which switches at approx ummm kHz or so.

I Googled about, and tried to replace it with a BC Well, it’s whether excessive base current, or excessive product of Ic x Vce.

Seeing that your circuit has no feedback resistor anywhere on the 2SC, 2dc2001 would suggest to try adding a 10R resistor in the base of the 2SC resp BC after the 22R resistor that goes to the feedback path and see whether that improves the situation.

Can you clarify position of additional 10R resistor? This is from 2SC datasheet: So, transistor could overheat by high Vce or Ic.


Datasheet «2SC2001»

Hi there Chupacabras, when I replace it with a good C the whole circuit works just fine. So power dissipation would be mW, which is above maximum allowed power dissipation. Hence a load at its emitter or collector can cause it to have a negative impedance at its base. There are huge differences: Email Required, but never shown.

2SC2001 Datasheet PDF

Vce would be much higher than 1. Post Your Answer Discard 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.

My previous, sort-of related datasueet is here: The BC got kind of warm, and didn’t work. Attila Kinali 1, 1 9. The switching transistor shouldn’t go into breakdown.

It would take too much space to explain the exact mechanism here, but the gist is, the transistor acts as an impedance conversion element at high frequencies 2ssc2001 to beta being frequency dependent. When I replace it with a BC, the circuit doesn’t work at all. What could cause transistor to overheat? If not, you have to take out a good oscilloscope and look at the waveforms.


Home Questions Tags Users Unanswered. Thanks, any help appreciated! Hi, Attila, thanks so much for prompt reply.

2SC Datasheet, Equivalent, Cross Reference Search. Transistor Catalog

Ratasheet would severely limit the lifetime of an already stressed datashwet. Is it possible that there is another problem which caused your transistor to fail and which makes datazheet new transistor hot? Post as a guest Name. Chupacabras 3, 2 11 BC doesn’t seem suitable Ask Question. Sign up using Facebook. I have seen them referred to as ‘switching’ transistors somewhere, I don’t know what that specially means.

It is off the chart, it is a bad sign for this situation. But it will be lower, say it is mA. Base current is not a problem, it is limited by R to 4. It depends on your batch. Sign up using Email and Password. So, is there something ‘special’ about the C trannies? Thanks for that, but just want to clarify where do I put the resistor? I do not say your circuit is drawing mA, peaks could be higher or lower.