Monday, June 24, 2024

Are there different BD140 transistor pinouts?

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  • #111275

    I need to replace a PNP BD140 (BD140 datasheet) as I’m restoring a power supply, however, the replacement component has its base directly connected to the V+ via the diode bridge. I’m not sure if this is doable. I assumed the collector or emitter would receive the V+.

    Powered by an 18-volt source, a 100-volt transistor

    My suggestion is to connect the transistor “upside down,” with the base on top of the picture, biased by some DC from the massive resistor soldered to the two big locations, and the emitter and collector permitting the DC from the power supply to the power amp IC.

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