ZTX457

Series:	--
Packaging:	Bulk
Part Status:	Active
Transistor Type:	NPN
Current - Collector (Ic) (Max):	500mA
Voltage - Collector Emitter Breakdown (Max):	300V
Vce Saturation (Max) @ Ib, Ic:	300mV @ 10mA, 100mA
Current - Collector Cutoff (Max):	100nA (ICBO)
DC Current Gain (hFE) (Min) @ Ic, Vce:	50 @ 50mA, 10V
Power - Max:	1W
Frequency - Transition:	75MHz
Operating Temperature:	-55°C ~ 200°C (TJ)
Mounting Type:	Through Hole
Package / Case:	E-Line-3
Supplier Device Package:	E-Line (TO-92 compatible)
Base Part Number:	ZTX457

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Introduction

The ZTX457 transistor is a part of the popular Zetex bipolar transistor family. It is designed for general-purpose switching and amplification applications. The ZTX457 is a PNP Small-Signal transistor with features which accommodate a wide range of applications. This article will discuss the application field and the working principle of the ZTX457 transistor.

ZTX457 Applications

The ZTX457 transistor is widely used in a variety of electronic applications, including amplifier circuits, switch circuits, and, depending on the operating current, audio application circuits. It can also be used in relay circuits or as a buffer amplifier. In addition, the ZTX457 transistor can be used in circuits such as DC motors, mixers, and pulse width modulators.

ZTX457 Working Principle

The ZTX457 is a PNP bipolar junction transistor (BJT) which is designed to amplify, switch, and control electric signals. The working principle of the ZTX457 is that a small base current is used to control a larger collector-emitter current. The transistor consists of three regions called the emitter, base, and collector. When a small base current is applied to the base-emitter junction, it creates an electric field between the two that increases the current flow through the base-emitter junction. This process is known as “normally-on” operation and is responsible for the characteristic of the transistor.In examples of normally-on operation, when the small base current is applied, the current flow increases through the collector-emitter junction, and the transistor is activated. When the base current is removed, the transistor switches “off” and the current flow ceases.The ZTX457 transistor also has an active mode of operation called “normally-off”. In this mode, a current flow through the collector-emitter junction is blocked until a small current is introduced to the base-emitter junction. This creates an electric field that opens the switch allowing collector-emitter current to flow.

Conclusion

The ZTX457 is a versatile and reliable PNP transistor with a wide variety of applications. It works on the principle of a small base current controlling a larger collector-emitter current through the use of an electric field created between the two. This allows for both “normally-on” and “normally-off” operation allowing the transistor to switch, amplify, and control electric signals depending on the application.

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