STMicroelectronics

SD1477

SD1477 Description

The SD1477 from STMicroelectronics is a high-performance NPN RF bipolar transistor designed for demanding RF applications. Packaged in the M111 surface-mount form factor, it offers a collector-emitter breakdown voltage (V_CE) of 18V and a maximum collector current (I_C) of 20A, making it suitable for high-power RF amplification. With a power dissipation capability of 270W and an operating temperature range up to 200°C (T_J), this transistor ensures reliability in harsh environments. Its DC current gain (h_FE) of 10 @ 5A, 5V and 6dB gain highlight its efficiency in signal amplification.

SD1477 Features

• High Power Handling: 270W max power dissipation for robust performance.
• Surface-Mount Design: M111 package enables compact PCB integration.
• Wide Temperature Range: Operates reliably up to 200°C junction temperature.
• Optimized RF Performance: 6dB gain and low-loss characteristics for efficient RF amplification.
• Compliance: ROHS3 Compliant and REACH Unaffected, meeting environmental standards.
• High Current Capability: 20A collector current supports high-power applications.

SD1477 Applications

The SD1477 excels in RF power amplification, particularly in:

• RF Transmitters & Amplifiers: Ideal for industrial and communication systems requiring stable high-power output.
• HF/VHF/UHF Applications: Suitable for radio frequency circuits in broadcast and military equipment.
• RF Switching & Modulation: Used in pulsed RF systems due to its fast switching and thermal resilience.
• Automotive & Aerospace RF Systems: Withstands high temperatures and vibrations, making it suitable for rugged environments.

Conclusion of SD1477

The SD1477 NPN RF transistor is a high-reliability solution for power RF amplification, combining high current handling, thermal stability, and compact packaging. Its obsolete status may limit new designs, but its performance makes it a strong candidate for legacy or specialized systems requiring robust RF transistors. Engineers should evaluate alternatives for future-proofing while leveraging SD1477’s strengths in high-power, high-frequency applications.