MM421 NPN Transistor

The MM421 is a bipolar junction transistor (BJT) with an NPN-type configuration. That means the MM421 transistor has a positively charged layer between two negatively charged layers. This transistor has three terminals Base, Collector, and Emitter.

The MM421 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 MM421 transistor as follows.

MM421 Transistor Specification

Transistor Code		MM421
Transistor Type		BJT
Transistor Polarity		NPN
Transistor Material		Silicon(SI)
Package		TO-39
Collector Power Dissipation (Maximum)	PC	0.8W
Collector-Base Voltage (Maximum)	VCB	350V
Collector-Emitter Voltage (Maximum)	VCE	325V
Collector Current (Maximum)	IC	0.1A
Emitter-Base Voltage (Maximum)	VEB	6V
Forward Current Transfer Ratio (hFE Value)		25
Transition Frequency	FT	15MHz
Collector Capacitance	CC	12pF

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