KST42MTF

Single Bipolar Transistors Overview

The KST42MTF is an NPN epitaxial silicon transistor from the KST42 series, manufactured by onsemi. It features a collector-emitter voltage (VCEO) of 300 V and a collector-base voltage (VCBO) of 300 V. The device supports a continuous collector current of 500 mA with a power dissipation rating of 350 mW in a SOT-23 surface-mount package. Key electrical characteristics include a DC current gain (hFE) ranging from 25 to 40, a collector-emitter saturation voltage of 0.5 V at 20 mA, and a transition frequency (fT) of 50 MHz.

Single Bipolar Transistors Feature Summary

• High-voltage capability with 300 V breakdown ratings for collector-emitter and collector-base configurations
• Designed for high-speed switching applications with a 50 MHz current gain bandwidth product
• Optimized for low saturation voltage to minimize conduction losses during operation

Single Bipolar Transistors Applications

• High-voltage switching circuits
• General-purpose amplifier stages
• Driver circuits requiring compact surface-mount packaging

Single Bipolar Transistors Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels due to industry counterfeiting risks. Confirm that the specific ordering suffix matches the required tape and reel packing method. Ensure compliance with RoHS directives and check for any recent Fairchild Semiconductor integration updates regarding part nomenclature changes before finalizing procurement orders.

Single Bipolar Transistors Selection Notes

Select this component when a high-voltage NPN transistor is required in a small SOT-23 footprint. The 300 V rating distinguishes it from standard low-voltage alternatives. Evaluate thermal resistance constraints carefully, as the junction-to-ambient rating limits total power dissipation. Compare against the KST43 variant if a lower 200 V rating suffices for the application design requirements.

Single Bipolar Transistors Part Context

This device belongs to the KST42/KST43 family originally developed by Fairchild Semiconductor and now managed by onsemi following corporate integration. The KST42 specifically denotes the 300 V version, while the KST43 offers a 200 V rating. Both share identical physical dimensions and pinouts within the SOT-23 3L package format.

Single Bipolar Transistors Replacement Considerations

KST43MTF serves as a verified substitute within the same series, offering identical packaging and performance except for a reduced 200 V collector-emitter voltage rating.