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BU221 NPN Transistor

The BU221 is a bipolar junction transistor (BJT) with an NPN-type configuration. That means the BU221 transistor has a positively charged layer between two negatively charged layers. This transistor has three terminals Base, Collector, and Emitter.

The BU221 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 BU221 transistor as follows.

Circuit diagram symbol of the BU221 transistor

BU221 Transistor Specification

Transistor Code BU221
Transistor Type BJT
Transistor Polarity NPN
Transistor Material Silicon(SI)
Package TO3
Collector Power Dissipation (Maximum) PC 100W
Collector-Base Voltage (Maximum) VCB 800V
Collector Current (Maximum) IC 15A
Operating Junction Temperature (Maximum) TJ 200°C
Emitter-Base Voltage (Maximum) VEB 6V
Forward Current Transfer Ratio (hFE Value) 5

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