ZTX857STZ Discrete Semiconductor Products

Series:	--
Packaging:	Tape & Box (TB)
Part Status:	Active
Transistor Type:	NPN
Current - Collector (Ic) (Max):	3A
Voltage - Collector Emitter Breakdown (Max):	300V
Vce Saturation (Max) @ Ib, Ic:	250mV @ 600mA, 3A
Current - Collector Cutoff (Max):	1µA (ICBO)
DC Current Gain (hFE) (Min) @ Ic, Vce:	100 @ 500mA, 10V
Power - Max:	1.2W
Frequency - Transition:	80MHz
Operating Temperature:	-55°C ~ 200°C (TJ)
Mounting Type:	Through Hole
Package / Case:	E-Line-3, Formed Leads
Supplier Device Package:	E-Line (TO-92 compatible)
Base Part Number:	ZTX857

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Introduction to ZTX857STZ
ZTX857STZ is a single-transistor bipolar junction device specifically designed for high performance applications and is manufactured by ST Microelectronics. The device contains two p-type and two n-type regions and operates as a three-terminal, current-controlled device. It offers excellent gain, operation and voltage characteristics in order to ensure high-accuracy and reliable performance. ZTX857STZ is the ideal choice for medium-to-high-power applications, such as switching regulators, audio amplifiers and motor control applications.

Application Field
The ZTX857STZ can be applied in various electronic circuits. It can be used as a high performance switching device, for example, in switching light dimmers, power supplies and general drives. In audio applications, it can be used as an amplifier to provide a clean sound output. It is also suitable for motor control applications, such as controlling fans and motors, as well as other applications that require high speed and excellent thermal performance. In addition, the ZTX857STZ is ideal for automotive and telecommunication applications, due to its low noise level and low on-resistance feature.

Advantages of ZTX857STZ
The ZTX857STZ offers excellent performance in a wide variety of applications. One of the main benefits of using this device is its low on-resistance. This feature ensures that the functional voltage drop across the transistor is minimized, therefore increasing the overall efficiency of the circuit. The device also has a very fast switching speed, which makes it suitable for high-speed applications. In addition, the device has a low noise level, which makes it ideal for automotive and telecommunication applications.

Characteristics of ZTX857STZ
The ZTX857STZ has a voltage rating of 150V, a current rating of 2A, and a power rating of 2W. The device has a maximum collector-emitter voltage (Vce) of 40V, which prevents it from damaging the circuit. The device also has a minimum collector current (Ic) of 6mA and a maximum emitter current (Ie) of 8mA. The device also has a maximum reverse leakage current of 10μA, which allows low-power circuits to be powered without any additional components.

Working Principle of ZTX857STZ
The ZTX857STZ is a current-controlled device. It works by controlling the current passing through it from the collector to the emitter. The current passing through the ZTX857STZ is determined by the current passing through the base terminal. When the base current is increased, the collector current increases proportionally. Similarly, when the base current is reduced, the collector current also decreases. In this way, the ZTX857STZ acts as a variable current sink/source depending on the applied voltages and currents.

Conclusion
The ZTX857STZ is a single-transistor bipolar junction device specifically designed for high performance applications. The device offers excellent performance in a wide variety of applications, thanks to its excellent characteristics. Its fast switching speed, low on-resistance and low noise levels make it ideal for switching regulators, audio amplifiers, motor control and automotive applications. The device is designed to control the current from the collector to the emitter and is used as a variable current sink/source.

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