BF858A NPN Transistor

The BF858A is a bipolar junction transistor (BJT) with an NPN-type configuration. That means the BF858A transistor has a positively charged layer between two negatively charged layers. This transistor has three terminals Base, Collector, and Emitter.

The BF858A 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 BF858A transistor as follows.

BF858A Transistor Specification

Transistor Code		BF858A
Transistor Type		BJT
Transistor Polarity		NPN
Transistor Material		Silicon(SI)
Package		TO202
Collector Power Dissipation (Maximum)	PC	1.8W
Collector-Base Voltage (Maximum)	VCB	270V
Collector-Emitter Voltage (Maximum)	VCE	250V
Collector Current (Maximum)	IC	0.1A
Operating Junction Temperature (Maximum)	TJ	150°C
Emitter-Base Voltage (Maximum)	VEB	5V
Forward Current Transfer Ratio (hFE Value)		25
Transition Frequency	FT	90MHz
Collector Capacitance	CC	4.2pF

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