BF221 NPN Transistor

The BF221 is a bipolar junction transistor (BJT) with an NPN-type configuration. That means the BF221 transistor has a positively charged layer between two negatively charged layers. This transistor has three terminals Base, Collector, and Emitter.

The BF221 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 BF221 transistor as follows.

BF221 Transistor Specification

Transistor Code		BF221
Transistor Type		BJT
Transistor Polarity		NPN
Transistor Material		Silicon(SI)
Package		TO18
Collector Power Dissipation (Maximum)	PC	0.3W
Collector-Base Voltage (Maximum)	VCB	30V
Collector-Emitter Voltage (Maximum)	VCE	30V
Collector Current (Maximum)	IC	0.1A
Operating Junction Temperature (Maximum)	TJ	185°C
Emitter-Base Voltage (Maximum)	VEB	6V
Forward Current Transfer Ratio (hFE Value)		20
Transition Frequency	FT	70MHz
Collector Capacitance	CC	5.6pF

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