AF257 PNP Transistor

The AF257 is a bipolar junction transistor (BJT) with an PNP-type configuration. That means the AF257 transistor has a negatively charged layer between two positively charged layers. This transistor has three terminals Base, Collector, and Emitter.

The AF257 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 AF257 transistor as follows.

AF257 Transistor Specification

Transistor Code		AF257
Transistor Type		BJT
Transistor Polarity		PNP
Transistor Material		Germanium(GE)
Package		U21
Collector Power Dissipation (Maximum)	PC	0.03W
Collector-Base Voltage (Maximum)	VCB	25V
Collector-Emitter Voltage (Maximum)	VCE	18V
Collector Current (Maximum)	IC	0.01A
Operating Junction Temperature (Maximum)	TJ	90°C
Forward Current Transfer Ratio (hFE Value)		28
Transition Frequency	FT	170MHz

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