KSC3123YMTF

Overview

The KSC3123YMTF is an NPN epitaxial silicon transistor manufactured by onsemi, housed in a SOT-23 surface-mount package. It is designed for UHF TV tuner mixer applications. Key electrical parameters include a collector-emitter voltage (VCEO) of 20 V and a collector-base voltage (VCBO) of 30 V. The device supports a maximum collector current of 50 mA with a power dissipation rating of 150 mW at 25°C. It features a current gain bandwidth product (fT) ranging from 900 to 1400 MHz and offers conversion gains between 20 and 23 dB at 200 MHz.

Feature Summary

• Optimized for high-frequency mixer operations within UHF television tuner circuits
• Provides stable performance with low reverse transfer capacitance for signal integrity
• Utilizes a compact SOT-23 surface-mount footprint for efficient board space utilization

Applications

• UHF TV tuner mixer stages
• RF signal processing circuits
• High-frequency amplification modules

Procurement Notes

Verify the component status as this part was originally produced by Fairchild Semiconductor prior to its acquisition by onsemi. Confirm that the specific ordering suffix matches the required hFE classification grade (R, O, or Y) to ensure compatibility with circuit gain requirements. Check for availability of original datasheets to validate historical specifications against current inventory.

Selection Notes

Select this transistor when designing UHF tuner mixers requiring an NPN configuration with moderate voltage ratings. Ensure the application operates within the 150 mW power dissipation limit at ambient temperatures up to 25°C. Consider the hFE classification grades to match the specific gain requirements of the RF stage design.

Part Context

This component belongs to the KSC series of small-signal transistors originally developed by Fairchild Semiconductor. Following corporate acquisitions, the product line is now managed under the onsemi brand portfolio. The KSC3123 specifically targets analog RF applications, distinguishing itself through its high transition frequency and low noise characteristics suitable for broadcast reception systems.

Replacement Considerations

Direct substitutes may include other NPN RF transistors in SOT-23 packages with similar VCEO and fT ratings. Verify pinout compatibility and thermal characteristics before implementation. Cross-reference with current onsemi or third-party equivalents ensuring the replacement meets the 200 MHz operational frequency requirements.