BF491K PNP Transistor

The BF491K is a bipolar junction transistor (BJT) with an PNP-type configuration. That means the BF491K transistor has a negatively charged layer between two positively charged layers. This transistor has three terminals Base, Collector, and Emitter.

The BF491K 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 BF491K transistor as follows.

BF491K Transistor Specification

Transistor Code		BF491K
Transistor Type		BJT
Transistor Polarity		PNP
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	6V
Forward Current Transfer Ratio (hFE Value)		25
Transition Frequency	FT	50MHz
Collector Capacitance	CC	1.6pF

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