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I have a circuit in which the C aka 2SC transistor failed after many years. I Googled about, 2sc2001 tried to replace it with a BC The BC got kind of warm, and didn’t work.
So, is there something ‘special’ about the C trannies? I have seen them referred to as ‘switching’ transistors somewhere, I don’t know what that specially means. This is being used in a flyback circuit, which switches at approx ummm kHz or so.
My previous, sort-of related question is here: What type of voltage booster circuit is this? What could cause transistor to overheat? Well, it’s whether excessive base current, or excessive product of Ic x Vce.
This is your circuit: Base current is not a problem, it is limited by R to 4. So, transistor could overheat by high Vce or Ic. But it will be lower, say it is mA.
Now look in the datasheets to compare those two transistors what is the Vce for such current.
2SC Datasheet, Equivalent, Cross Reference Search. Transistor Catalog
This is from 2SC datasheet: This is from BC datasheet: It is off the chart, it is a bad sign for this situation. Vce would be dztasheet higher than 1. So power dissipation would be mW, which is above maximum allowed power dissipation. I do not say your circuit is drawing mA, peaks could be higher or lower.
But you can see that in some situations there are differences between BC and 2SC Another relevant difference could be in hFE. It depends on your batch. There are huge differences: BC hFE from to Seeing that your circuit has no feedback resistor anywhere on the 2SC, I would suggest to try adding a 10R resistor in the base of the 2s2001 resp BC after the 22R resistor that goes to the feedback path and see whether that improves the situation. If not, you have to take out a good oscilloscope and look at the waveforms.
BC doesn’t seem suitable Ask Question. Thanks, any help appreciated! I have short-term access to another C – putting that in the circuit works just fine, so I know the transistor is the issue. How do you know that your transistor is the only problem in your circuit? Is it possible datasheer there is another problem which caused your transistor to fail and which makes your ddatasheet transistor hot?
Hi there Chupacabras, when I replace it with a dayasheet C the whole circuit works just fine. When I replace it with a BC, the circuit doesn’t work at all. Chupacabras 3, 2 11 Adding schematic to show what I mean: Attila Kinali 1, 1 9. Hi, Attila, thanks so much for prompt reply.
Can you clarify position of additional 10R resistor? The switching transistor shouldn’t go into breakdown. This would severely limit the lifetime of an already stressed component. It would take too much space to explain the exact mechanism here, but the gist 2sc22001, the transistor acts as an impedance conversion element at high frequencies due to beta being frequency dependent.
Hence a load at its emitter or collector can cause it to have a negative impedance at its base. The additional resistor dampens this oscillation. Thanks for that, but just want to clarify where do I put the resistor? Sign up or log in Sign up using Google. Sign up using Dtasheet.