How does a transistor's current rating affect performance?
I have a NPN transistor rated for 200mA connected to a motor. The motor needs 1.5A to run effectively. When the motor and 1.5A are connected to the transistor the motor works, but very slowly. Would this be because of the transistor's 200mA rating? I would have thought it would just blow the transistor rather than just reducing the current to 200mA. Any help?
Asked By: Chris L - 10/1/2008
Best Answer - Chosen by Asker
If the motor is attempting to draw an amp and a half, you certainly aren't doing transistor with a collector current rating of 200mA a whole lot of good. It's sort of the same theory as shorting out a battery. While you're not guaranteed that it's going to leak or explode, you are still trying to draw more current... More
Answered By: Adam F - 10/3/2008
Additional Answers (1)
Why would you use a transistor rated at 200ma in a 1.5 amp load? You are lucky it didn't blow out! I'd have to see the circuit to understand why. The transistor probably still has some gain at higher currents, and that is what is making the motor move. you want help? get a properly rated transistor!! .
Answered By: billrussell42 - 10/1/2008
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