BD221 NPN Transistor

The BD221 is a bipolar junction transistor (BJT) with an NPN-type configuration. That means the BD221 transistor has a positively charged layer between two negatively charged layers. This transistor has three terminals Base, Collector, and Emitter.

The BD221 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 BD221 transistor as follows.

BD221 Transistor Specification

Transistor Code		BD221
Transistor Type		BJT
Transistor Polarity		NPN
Transistor Material		Silicon(SI)
Package		TO220
Collector Power Dissipation (Maximum)	PC	36W
Collector-Base Voltage (Maximum)	VCB	60V
Collector-Emitter Voltage (Maximum)	VCE	40V
Collector Current (Maximum)	IC	4A
Operating Junction Temperature (Maximum)	TJ	130°C
Forward Current Transfer Ratio (hFE Value)		30
Transition Frequency	FT	0.8MHz

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