BD509 NPN Transistor

The BD509 is a bipolar junction transistor (BJT) with an NPN-type configuration. That means the BD509 transistor has a positively charged layer between two negatively charged layers. This transistor has three terminals Base, Collector, and Emitter.

The BD509 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 BD509 transistor as follows.

BD509 Transistor Specification

Transistor Code		BD509
Transistor Type		BJT
Transistor Polarity		NPN
Transistor Material		Silicon(SI)
Package		TO202
Collector Power Dissipation (Maximum)	PC	10W
Collector-Base Voltage (Maximum)	VCB	50V
Collector-Emitter Voltage (Maximum)	VCE	40V
Collector Current (Maximum)	IC	2A
Operating Junction Temperature (Maximum)	TJ	150°C
Emitter-Base Voltage (Maximum)	VEB	5V
Forward Current Transfer Ratio (hFE Value)		40
Transition Frequency	FT	50MHz

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