STMicroelectronics

SD1728

SD1728 Description

The SD1728 from STMicroelectronics is a high-performance NPN RF bipolar transistor designed for demanding RF amplification applications. Packaged in the M177 surface-mount case, it offers a robust 55V collector-emitter breakdown voltage (V_CE), a 40A maximum collector current (I_C), and an impressive 330W power dissipation capability. With a DC current gain (h_FE) of 23 @ 10A, 6V and a gain range of 15dB–17dB, this transistor excels in high-power RF amplification while maintaining efficiency. Its 200°C maximum junction temperature (T_J) ensures reliable operation under thermal stress.

SD1728 Features

• High Power Handling: 330W max power dissipation for demanding RF applications.
• High Current Capability: 40A collector current supports robust signal amplification.
• Optimized Gain: 15dB–17dB gain range ensures efficient RF performance.
• Thermal Resilience: Operates up to 200°C (T_J), ideal for high-temperature environments.
• Surface-Mount Design: M177 package enables compact PCB integration.
• Compliance: ROHS3 compliant and REACH unaffected, meeting environmental standards.
• Obsolete Status: While no longer in production, it remains viable for legacy designs.

SD1728 Applications

The SD1728 is tailored for RF power amplification in:

• Industrial RF Systems: High-power RF drivers and amplifiers.
• Broadcast Equipment: UHF/VHF transmitters and RF stages.
• Military & Aerospace: Ruggedized RF modules requiring high thermal stability.
• Amateur Radio (HAM): Linear amplifiers for high-frequency transmission.
• Medical RF Devices: Where consistent gain and power efficiency are critical.

Conclusion of SD1728

The SD1728 stands out as a high-power RF transistor with exceptional thermal and electrical performance, making it ideal for high-frequency, high-power amplification. Its M177 package and 55V/40A ratings provide a balance of power and efficiency, while its obsolete status suggests suitability for legacy system maintenance rather than new designs. Engineers seeking a reliable, high-gain NPN transistor for RF applications will find the SD1728 a compelling choice, particularly in environments demanding thermal resilience and consistent RF output.