2N4257A PNP Transistor

The 2N4257A is a bipolar junction transistor (BJT) with an PNP-type configuration. That means the 2N4257A transistor has a negatively charged layer between two positively charged layers. This transistor has three terminals Base, Collector, and Emitter.

The 2N4257A 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 2N4257A transistor as follows.

2N4257A Transistor Specification

Transistor Code		2N4257A
Transistor Type		BJT
Transistor Polarity		PNP
Transistor Material		Silicon(SI)
Package		TO18
Collector Power Dissipation (Maximum)	PC	0.2W
Collector-Base Voltage (Maximum)	VCB	6V
Collector-Emitter Voltage (Maximum)	VCE	6V
Collector Current (Maximum)	IC	0.05A
Operating Junction Temperature (Maximum)	TJ	125°C
Emitter-Base Voltage (Maximum)	VEB	4V
Forward Current Transfer Ratio (hFE Value)		30
Transition Frequency	FT	500MHz
Collector Capacitance	CC	3pF

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