BU121 NPN Transistor

The BU121 is a bipolar junction transistor (BJT) with an NPN-type configuration. That means the BU121 transistor has a positively charged layer between two negatively charged layers. This transistor has three terminals Base, Collector, and Emitter.

The BU121 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 BU121 transistor as follows.

BU121 Transistor Specification

Transistor Code		BU121
Transistor Type		BJT
Transistor Polarity		NPN
Transistor Material		Silicon(SI)
Package		TO3
Collector Power Dissipation (Maximum)	PC	50W
Collector-Base Voltage (Maximum)	VCB	200V
Collector-Emitter Voltage (Maximum)	VCE	200V
Collector Current (Maximum)	IC	10A
Operating Junction Temperature (Maximum)	TJ	150°C
Emitter-Base Voltage (Maximum)	VEB	8V
Forward Current Transfer Ratio (hFE Value)		7
Transition Frequency	FT	4MHz

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