A157 NPN Transistor

The A157 is a bipolar junction transistor (BJT) with an NPN-type configuration. That means the A157 transistor has a positively charged layer between two negatively charged layers. This transistor has three terminals Base, Collector, and Emitter.

The A157 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 A157 transistor as follows.

A157 Transistor Specification

Transistor Code		A157
Transistor Type		BJT
Transistor Polarity		NPN
Transistor Material		Silicon(SI)
Package		TO18
Collector Power Dissipation (Maximum)	PC	0.3W
Collector-Base Voltage (Maximum)	VCB	50V
Collector-Emitter Voltage (Maximum)	VCE	45V
Collector Current (Maximum)	IC	0.1A
Operating Junction Temperature (Maximum)	TJ	175°C
Emitter-Base Voltage (Maximum)	VEB	5V
Forward Current Transfer Ratio (hFE Value)		125
Transition Frequency	FT	150MHz
Collector Capacitance	CC	5pF

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