2N4957 PNP Transistor

The 2N4957 is a bipolar junction transistor (BJT) with an PNP-type configuration. That means the 2N4957 transistor has a negatively charged layer between two positively charged layers. This transistor has three terminals Base, Collector, and Emitter.

The 2N4957 transistor symbol shows an arrow from the emitter into the base. This means that the current flows from emitter to collector terminal.

Circuit diagram symbol of the 2N4957 transistor as follows.

2N4957 Transistor Specification

Transistor Code		2N4957
Transistor Type		BJT
Transistor Polarity		PNP
Transistor Material		Silicon(SI)
Package		TO72
Collector Power Dissipation (Maximum)	PC	0.2W
Collector-Base Voltage (Maximum)	VCB	20V
Collector-Emitter Voltage (Maximum)	VCE	20V
Collector Current (Maximum)	IC	0.03A
Operating Junction Temperature (Maximum)	TJ	200°C
Emitter-Base Voltage (Maximum)	VEB	3V
Forward Current Transfer Ratio (hFE Value)		20
Transition Frequency	FT	1600MHz
Collector Capacitance	CC	0.4pF

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