AC121-4 PNP Transistor

The AC121-4 is a bipolar junction transistor (BJT) with an PNP-type configuration. That means the AC121-4 transistor has a negatively charged layer between two positively charged layers. This transistor has three terminals Base, Collector, and Emitter.

The AC121-4 transistor symbol shows an arrow from the emitter into the base. This means that the current flows from emitter to collector terminal.

Circuit diagram symbol of the AC121-4 transistor as follows.

AC121-4 Transistor Specification

Transistor Code		AC121-4
Transistor Type		BJT
Transistor Polarity		PNP
Transistor Material		Germanium(GE)
Package		TO1
Collector Power Dissipation (Maximum)	PC	0.9W
Collector-Base Voltage (Maximum)	VCB	20V
Collector-Emitter Voltage (Maximum)	VCE	20V
Collector Current (Maximum)	IC	0.3A
Operating Junction Temperature (Maximum)	TJ	90°C
Emitter-Base Voltage (Maximum)	VEB	10V
Forward Current Transfer Ratio (hFE Value)		30
Transition Frequency	FT	1MHz
Collector Capacitance	CC	40pF

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