2SD257 NPN Transistor

The 2SD257 is a bipolar junction transistor (BJT) with an NPN-type configuration. That means the 2SD257 transistor has a positively charged layer between two negatively charged layers. This transistor has three terminals Base, Collector, and Emitter.

The 2SD257 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 2SD257 transistor as follows.

2SD257 Transistor Specification

Transistor Code		2SD257
Transistor Type		BJT
Transistor Polarity		NPN
Transistor Material		Silicon(SI)
Package		TO66
Collector Power Dissipation (Maximum)	PC	25W
Collector-Base Voltage (Maximum)	VCB	90V
Collector-Emitter Voltage (Maximum)	VCE	65V
Collector Current (Maximum)	IC	4A
Operating Junction Temperature (Maximum)	TJ	150°C
Emitter-Base Voltage (Maximum)	VEB	7V
Forward Current Transfer Ratio (hFE Value)		40
Transition Frequency	FT	4MHz

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