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BD142 NPN Transistor

The BD142 is a bipolar junction transistor (BJT) with an NPN-type configuration. That means the BD142 transistor has a positively charged layer between two negatively charged layers. This transistor has three terminals Base, Collector, and Emitter.

The BD142 transistor symbol shows an arrow from the base into the emitter. This means that the current flows from collector terminal to emitter terminal.

Circuit diagram symbol of the BD142 transistor as follows.

Circuit diagram symbol of the BD142 transistor

BD142 Transistor Specification

Transistor Code BD142
Transistor Type BJT
Transistor Polarity NPN
Transistor Material Silicon(SI)
Package TO3
Collector Power Dissipation (Maximum) PC 117W
Collector-Base Voltage (Maximum) VCB 50V
Collector-Emitter Voltage (Maximum) VCE 40V
Collector Current (Maximum) IC 45A
Operating Junction Temperature (Maximum) TJ 200°C
Emitter-Base Voltage (Maximum) VEB 5V
Forward Current Transfer Ratio (hFE Value) 13
Transition Frequency FT 0.7MHz

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