2SA1428-Y,T2F(M

Series:	--
Packaging:	Bulk
Part Status:	Obsolete
Transistor Type:	PNP
Current - Collector (Ic) (Max):	2A
Voltage - Collector Emitter Breakdown (Max):	50V
Vce Saturation (Max) @ Ib, Ic:	500mV @ 50mA, 1A
Current - Collector Cutoff (Max):	1µA (ICBO)
DC Current Gain (hFE) (Min) @ Ic, Vce:	70 @ 500mA, 2V
Power - Max:	900mW
Frequency - Transition:	100MHz
Operating Temperature:	150°C (TJ)
Mounting Type:	Through Hole
Package / Case:	SC-71
Supplier Device Package:	MSTM

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2SA1428-Y,T2F(M Application Field and Working Principle

The 2SA1428-Y,T2F(M) is a bipolar junction transistor (BJT) primarily used in audio amplifiers, voltage regulators, and in consumer and automotive electronics. The device comes in a miniature package, which allows for its convenient usage in various consumer electronic items such as TVs and video game consoles. Additionally, this single transistor can be employed in DC-DC converter control circuits and other circuit boards that require high input impedance.This BJT consists of three terminals namely the collector, base, and emitter. The collector forms the output of the transistor and the emitter forms the input. The base is a control input that allows the user to control the current flow between the collector and emitter. Depending on the biasing of the base, the transistor can be used as a switch or an amplifier.In its switch mode of operation, the transistor is considered as an “on-off” switch. Once the base terminal is connected to a voltage source, the collector-emitter current flows, creating a conductive path between the collector and emitter. This allows the flow of current from the collector to the emitter when the voltage is high enough. The intermediary base voltage is known as the cut-off voltage and the biasing with a voltage above this value will create an off state.In the amplifier mode, the transistor is further classified as either an emitter-follower or a common-emitter amplifier. In the common-emitter amplifier, the input signal is applied to the base and the amplified output appears at the collector. The common-emitter amplifier has a relatively high voltage gain and is often used for amplifying audio signals. On the other hand, the emitter-follower amplifier is a voltage amplifier that can be used for buffering, voltage gain, isolation, and impedance matching.In both switch and amplifier modes, the transistor needs to be biased correctly. Biasing is the process of supplying a direct current (DC) voltage to the transistor’s base terminal. This voltage can either be set at a constant value or can be varied depending on the application. The DC voltage applied to the base terminal is used to control the collector-emitter current and amplify signals if the transistor is operating in an amplifier mode.The 2SA1428-Y,T2F(M) bipolar junction transistor (BJT) is a small and reliable device that finds its application in various consumer electronics and other circuits. Its three-terminal construction allows it to be used as a switch or an amplifier depending on the user’s requirements. The device can be used as an amplifier in either the common-emitter or the emitter-follower amplifier configurations. The device requires correct biasing in order to work properly, and the biasing is done through the application of a direct current voltage to the base terminal.

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