Testing a 2SD711A. B-E reads 0.25v drop in both directions. Normally I?d throw it in the trash but looking at the equivalent schematic I see a resistor paralleling each B-E junction. Would a healthy device give a v-drop in reverse polarity like I?m seeing?
Those readings sound good. The fact that they differ based on polarity is a good sign. The problem I have is that means the total shunt resistance (wh ich is in series) is low.
The spec sheet says at 6 volts Vebo, Iebo is 50 mA. In a normal transistor this is a leakage spec. but in this case it should tell us the value of tho se resistors. So 6 / 0.05 = 120.
With the 1.1 forward, it is likely good. The EB junction is not open. I ass ume you checked the BC junction and found it open one way and a diode the o ther way. The whole thing is not shorted nor open, the odds are 99.9 % this is a good part.
This is a switching transistor. Not the greatest but good enough for some t hings. Still maintains 50 HFE at 15 amps with Vce 1.5 volts. Back when that thing probably came out is was considered pretty good.
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