KST42 NPN Transistor

KST42 Transistor
KST42 Transistor
KST42 Transistor Pinout
KST42 Transistor
KST42 Transistor Pinout

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The KST42 is a SMD package NPN Transistor that has high collector emitter voltage of 300V and a collector current of 500mA. The transistor is a general purpose transistor and can be used for both switching and amplification purpose.


Pin Configuration

Pin Number

Pin Name




Current Drains out through emitter, normally connected to ground



Controls the biasing of transistor, Used to turn ON or OFF the transistor



Current flows in through collector, normally connected to load



·         General Purpose NPN Transistor

·         Current Gain (hFE), 40

·         Continuous Collector current (IC) is 500mA

·         Collector-Emitter voltage (VCEO) is 300 V

·         Collector-Base voltage (VCB0) is 300V

·         Emitter Base Voltage (VBE0) is 6V

·         Transition Frequency 50MHz

·         Available only in SOT23 SMD Package


Note: Complete Technical Details can be found at the KST42 Transistor datasheet given at the end of this page.


Equivalent for KST42:  CHT42GP, FJV42MTF, STR1550


Complementary PNP for KST12: KST92


Brief Description of KST42

The KST12 is a high voltage NPN Transistor that can be used to switch high voltage applications. The transistor has a collector emitter voltage of 300V and a base trigger voltage of 6V. The maximum collector current through the transistor is 500mA. It also has a gain value of 40 and hence can be used in low audio amplifier designs.

Since the transistor also has its complementary PNP part, the KST92 both can be combined to build push pull circuits and other amplifier circuits. The transistor is available only in SMD package and has a marking “D1” on top of it for identification.


2N7002 Applications

·         High Voltage switching applications

·         Microphone Amplifiers

·         Low Power amplifiers

·         Application where low on-state resistance is required.

·         Power management applications



The Mosfet is available in SOT23 SMD Package, the dimensions of the SOT 23 package is shown below. Refer the datasheet below for other dimensions.

KST42 NPN Transistor 2-D Model 


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