BF109 NPN Transistor

The BF109 is a bipolar junction transistor (BJT) with an NPN-type configuration. That means the BF109 transistor has a positively charged layer between two negatively charged layers. This transistor has three terminals Base, Collector, and Emitter.

The BF109 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 BF109 transistor as follows.

BF109 Transistor Specification

Transistor Code		BF109
Transistor Type		BJT
Transistor Polarity		NPN
Transistor Material		Silicon(SI)
Package		TO5
Collector Power Dissipation (Maximum)	PC	2.5W
Collector-Base Voltage (Maximum)	VCB	135V
Collector-Emitter Voltage (Maximum)	VCE	110V
Collector Current (Maximum)	IC	0.05A
Operating Junction Temperature (Maximum)	TJ	175°C
Emitter-Base Voltage (Maximum)	VEB	2V
Forward Current Transfer Ratio (hFE Value)		20
Transition Frequency	FT	80MMHz
Collector Capacitance	CC	3pF

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