BF257S NPN Transistor

The BF257S is a bipolar junction transistor (BJT) with an NPN-type configuration. That means the BF257S transistor has a positively charged layer between two negatively charged layers. This transistor has three terminals Base, Collector, and Emitter.

The BF257S 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 BF257S transistor as follows.

BF257S Transistor Specification

Transistor Code		BF257S
Transistor Type		BJT
Transistor Polarity		NPN
Transistor Material		Silicon(SI)
Package		TO39
Collector Power Dissipation (Maximum)	PC	0.5W
Collector-Base Voltage (Maximum)	VCB	140V
Collector-Emitter Voltage (Maximum)	VCE	140V
Collector Current (Maximum)	IC	0.1A
Operating Junction Temperature (Maximum)	TJ	125°C
Emitter-Base Voltage (Maximum)	VEB	5V
Forward Current Transfer Ratio (hFE Value)		25
Transition Frequency	FT	55MHz
Collector Capacitance	CC	7pF

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