KST4126MTF

Single Bipolar Transistors Overview

The KST4126MTF is a PNP epitaxial silicon transistor manufactured by onsemi, housed in an SOT-23-3 surface-mount package. It features a maximum collector-emitter voltage of -25 V and a continuous collector current rating of -200 mA. The device provides a DC current gain (hFE) ranging from 60 to 360 at specific test conditions and exhibits a transition frequency (fT) of 250 MHz. Power dissipation is rated at 350 mW with a thermal resistance junction-to-ambient of 357 °C/W.

Single Bipolar Transistors Feature Summary

• General-purpose PNP transistor design suitable for switching and amplification applications
• High-frequency performance characterized by a 250 MHz transition frequency
• Low noise figure specification for signal integrity in sensitive circuits

Single Bipolar Transistors Applications

• General purpose switching circuits
• Amplifier stages requiring low noise characteristics
• Signal processing applications utilizing high-frequency response

Single Bipolar Transistors Procurement Notes

Verify the component status carefully as this part may be obsolete or discontinued by the original manufacturer Fairchild Semiconductor. Confirm that onsemi has assumed production rights if sourcing from them. Ensure the SOT-23-3 footprint matches your PCB layout requirements. Check datasheet revisions for any parameter updates compared to legacy documentation.

Single Bipolar Transistors Selection Notes

Select this component when a small-form-factor PNP transistor is required for general-purpose tasks. Consider the -25 V voltage rating and -200 mA current limit against circuit demands. Evaluate the 350 mW power dissipation capability relative to thermal management constraints in the SOT-23-3 package. Verify compatibility with operating temperatures and signal frequencies up to 250 MHz.

Single Bipolar Transistors Part Context

This component belongs to the family of general-purpose bipolar junction transistors designed for compact electronic designs. Originally produced by Fairchild Semiconductor, it represents a standard solution for low-power switching and amplification needs in consumer and industrial electronics before potential obsolescence.

Single Bipolar Transistors Replacement Considerations

Public confirmed substitute part numbers are not available in the provided source material.