SD1224

Overview

The SD1224 is an epitaxial silicon NPN planar transistor designed primarily for 28 V FM Class C RF amplifiers utilized in ground station transmitters. It operates as a high-power RF device with a maximum collector current of 5 A and a breakdown voltage of 35 V. The component supports frequencies up to 175 MHz and delivers 60 W of power output. It utilizes a chassis mount M135 package configuration suitable for robust thermal management in transmitter applications.

Feature Summary

• Epitaxial silicon NPN planar construction optimized for RF performance
• Designed specifically for 28 V FM Class C amplifier stages
• Capable of handling high peak currents and substantial power dissipation
• Utilizes a chassis mount package for efficient heat transfer

Applications

• Ground station transmitter RF amplification
• FM broadcast transmitter driver stages
• High-power RF signal generation circuits
• Class C linear amplifier modules

Procurement Notes

Verify the specific datasheet revision and manufacturer documentation prior to procurement, as Microsemi Corporation components may have undergone corporate transitions affecting availability and specification updates. Confirm that the M135 chassis mount package matches the thermal design requirements of the target application. Ensure compliance with relevant environmental regulations and check for any obsolescence notices or lifecycle status changes associated with this specific part number before finalizing supply chain decisions.

Selection Notes

Select the SD1224 when designing 28 V FM Class C RF amplifier systems requiring high power output and robust thermal handling. The 35 V breakdown voltage and 5 A current rating provide sufficient headroom for standard transmitter operations. Consider the chassis mount M135 package for integration into larger transmitter assemblies where direct mounting to heatsinks is necessary. Evaluate the 175 MHz frequency limit against the specific carrier frequency requirements of the intended broadcast or communication system.

Part Context

The SD1224 belongs to the category of bipolar RF transistors manufactured by Microsemi Corporation. It is distinct from other Microsemi products such as the DSC1224DE2 MEMS oscillator or the NSD1224 half-bridge driver, serving a specialized role in high-power analog RF transmission rather than digital timing or motor control. Its design focuses on linearity and power efficiency in continuous wave FM applications.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided source material. Verify compatibility with existing thermal interfaces and mounting hardware if sourcing from alternative distributors or considering legacy stock.