BF391K NPN Transistor

The BF391K is a bipolar junction transistor (BJT) with an NPN-type configuration. That means the BF391K transistor has a positively charged layer between two negatively charged layers. This transistor has three terminals Base, Collector, and Emitter.

The BF391K 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 BF391K transistor as follows.

BF391K Transistor Specification

Transistor Code		BF391K
Transistor Type		BJT
Transistor Polarity		NPN
Transistor Material		Silicon(SI)
Package		TO92
Collector Power Dissipation (Maximum)	PC	0.625W
Collector-Base Voltage (Maximum)	VCB	200V
Collector-Emitter Voltage (Maximum)	VCE	200V
Collector Current (Maximum)	IC	0.5A
Operating Junction Temperature (Maximum)	TJ	150°C
Emitter-Base Voltage (Maximum)	VEB	5V
Forward Current Transfer Ratio (hFE Value)		40
Transition Frequency	FT	35MHz
Collector Capacitance	CC	3pF

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