KSC2757YMTF

Overview

The KSC2757YMTF is an NPN epitaxial silicon transistor manufactured by onsemi, originally designed by Fairchild Semiconductor. It operates with a collector-emitter voltage of 15 V and a collector current rating of 50 mA. The device features a typical current gain bandwidth product (fT) of 1100 MHz at 5 mA. Electrical characteristics include a DC current gain ranging from 60 to 240 depending on the classification grade. The component is housed in a SOT-23 surface-mount package and supports a maximum junction temperature of 150 °C.

Feature Summary

• High current gain bandwidth product suitable for VHF tuner mixer oscillator applications
• Low output capacitance for improved high-frequency performance
• Available in multiple hFE classification grades for precise gain control

Applications

• VHF tuner mixer oscillators
• General-purpose amplification circuits
• RF signal processing stages

Procurement Notes

Verify the specific ordering suffix YMTF against official distributor catalogs to confirm the exact tape-and-reel quantity and packaging configuration. Ensure compatibility with existing PCB footprints for the SOT-23 package. Confirm that the supply status aligns with project requirements, as legacy components may have limited availability or obsolescence risks.

Selection Notes

Select this component when a low-voltage NPN transistor with high fT is required for VHF frequencies. Verify that the required hFE gain falls within the available R, O, or Y classification ranges. Ensure the circuit design stays within the 15 V collector-emitter voltage limit and 50 mA collector current constraints to maintain reliability.

Part Context

This part belongs to the family of small-signal NPN transistors optimized for radio frequency applications. Originally produced by Fairchild Semiconductor, the manufacturing rights and product line are now managed by onsemi. The datasheet revision A2 indicates the final specifications before potential lifecycle changes.

Replacement Considerations

Check for direct pin-compatible replacements in the SOT-23 package with similar fT and VCEO ratings. Consult onsemi's official substitution guide for equivalent parts if the KSC2757YMTF is discontinued or unavailable.

FAQ

What is the typical current gain bandwidth product (fT) of the KSC2757?

The typical fT is 1100 MHz when measured at VCE=10V and IC=5mA.

What are the available hFE classification grades?

The device is classified into three grades: R (60-120), O (90-180), and Y (120-240).

What is the maximum collector-emitter voltage (VCEO)?

The absolute maximum rating for VCEO is 15 V.