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BF421 PNP Transistor

The BF421 is a bipolar junction transistor (BJT) with an PNP-type configuration. That means the BF421 transistor has a negatively charged layer between two positively charged layers. This transistor has three terminals Base, Collector, and Emitter.

The BF421 transistor symbol shows an arrow from the emitter into the base. This means that the current flows from emitter to collector terminal.

Circuit diagram symbol of the BF421 transistor as follows.

Circuit diagram symbol of the BF421 transistor

BF421 Transistor Specification

Transistor Code BF421
Transistor Type BJT
Transistor Polarity PNP
Transistor Material Silicon(SI)
Package TO92
Collector Power Dissipation (Maximum) PC 0.83W
Collector-Base Voltage (Maximum) VCB 300V
Collector-Emitter Voltage (Maximum) VCE 300V
Collector Current (Maximum) IC 0.025A
Operating Junction Temperature (Maximum) TJ 150°C
Emitter-Base Voltage (Maximum) VEB 5V
Forward Current Transfer Ratio (hFE Value) 50
Transition Frequency FT 60MHz
Collector Capacitance CC 1.6pF

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