BD257 NPN Transistor

The BD257 is a bipolar junction transistor (BJT) with an NPN-type configuration. That means the BD257 transistor has a positively charged layer between two negatively charged layers. This transistor has three terminals Base, Collector, and Emitter.

The BD257 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 BD257 transistor as follows.

BD257 Transistor Specification

Transistor Code		BD257
Transistor Type		BJT
Transistor Polarity		NPN
Transistor Material		Silicon(SI)
Package		TOP3
Collector Power Dissipation (Maximum)	PC	125W
Collector-Base Voltage (Maximum)	VCB	45V
Collector-Emitter Voltage (Maximum)	VCE	45V
Collector Current (Maximum)	IC	25A
Operating Junction Temperature (Maximum)	TJ	150°C
Forward Current Transfer Ratio (hFE Value)		10
Transition Frequency	FT	3MHz

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