SD2902

Overview

The SD2902 is a gold metallized N-channel MOS field-effect RF power transistor designed for large-signal applications up to 500 MHz. It operates at a drain-source voltage of 28 V and delivers 15 W output power with a minimum gain of 12.5 dB at 400 MHz. The device supports Class A or AB operation and features excellent thermal stability. Key electrical parameters include a breakdown voltage of 65 V, a maximum junction temperature of 200°C, and a junction-to-case thermal resistance of 3.0°C/W. It utilizes an M113 epoxy-sealed package.

Feature Summary

• Gold metallization provides enhanced thermal stability and reliability for high-frequency operations.
• Designed for common source configuration in HF, VHF, and UHF bands.
• Capable of handling large-signal applications across a wide frequency range.

Applications

• RF power amplification in HF/VHF/UHF transmitters
• Large-signal linear amplifier stages operating in Class A or AB modes
• Broadband communication systems requiring stable performance up to 500 MHz

Procurement Notes

Verify the component authenticity by checking the marking code against the official datasheet specifications. Ensure the package type matches the required mechanical dimensions for your heatsink interface. Confirm that the supplier provides traceability documentation consistent with STMicroelectronics manufacturing standards. Validate that the device meets the specified absolute maximum ratings for your intended operating conditions.

Selection Notes

Select this component when designing circuits requiring high thermal stability and reliable performance in the HF to UHF spectrum. Consider the 28 V supply requirement and the need for appropriate biasing networks for Class A or AB operation. Evaluate the thermal management solution based on the specified junction-to-case thermal resistance to ensure the junction temperature remains within safe limits during continuous operation.

Part Context

The SD2902 belongs to STMicroelectronics' portfolio of RF power transistors utilizing gold metallization technology. This series is engineered for robustness in demanding radio frequency environments. The device complements other models in the lineup by offering specific performance characteristics tailored for mid-power applications in the 2-500 MHz range.

Replacement Considerations

Consult the official STMicroelectronics replacement guide for verified cross-reference part numbers. Ensure any substitute device matches the pinout configuration, package dimensions, and critical electrical parameters such as breakdown voltage and output power capabilities.

FAQ

What is the maximum operating frequency for the SD2902?

The SD2902 is rated for operation up to 500 MHz.

What is the typical power gain at 400 MHz?

The typical power gain is 13.5 dB, with a minimum specification of 12.5 dB at 400 MHz under standard test conditions.

What package type does the SD2902 use?

The device uses an M113 epoxy-sealed package.