Limited Stock

STMicroelectronics SD2931-10 RF Power MOSFET Pair – Tested Close-Reading Pair

RF Transistors and Finals • SKU SKU RFB-SD2931-10-PAIR-003

$175.00

STMicroelectronics SD2931-10 RF power MOSFET pair, sold as a tested close-reading surplus pair for RF amplifier repair, HF final-stage service, radio restoration, and technician repair stock.

Each device was checked individually with a component analyzer and the readings are documented below. The two devices showed very close threshold, current, transconductance, resistance, and body-diode readings.

These devices are sold as premium RF repair stock, not as new factory-matched components. Buyer must verify compatibility, bias setup, mounting, thermal handling, and installation procedure before use

Vintage Semiconductor History – STMicroelectronics SD2931 RF Power MOSFET

The SD2931 RF power MOSFET family was developed by STMicroelectronics, one of the world's leading semiconductor manufacturers. STMicroelectronics was formed in 1987 through the merger of Italy's SGS Microelettronica and France's Thomson Semiconducteurs, combining decades of European semiconductor expertise into a global technology company.

Introduced as part of STMicroelectronics' high-power RF transistor product line, the SD2931 family became widely used in commercial communications equipment, broadcast transmitters, industrial RF systems, amateur radio amplifiers, and other demanding RF power applications. The device earned a strong reputation for ruggedness, reliability, and excellent RF performance.

Over the years, several versions of the SD2931 were produced, including devices optimized for different power levels and operating requirements. The transistor family became particularly popular among amateur radio amplifier manufacturers and was frequently selected for high-performance RF amplifier designs because of its ability to deliver substantial RF output power while maintaining dependable operation.

Although many original SD2931 variants are now considered legacy or obsolete devices, they remain highly sought after by repair technicians, amplifier builders, radio restorers, and collectors maintaining older communications equipment. Original STMicroelectronics devices are especially valued when repairing equipment designed around the SD2931 platform.

Many amateur radio operators recognize the SD2931 family as one of the classic RF power MOSFET series that helped bridge the transition from earlier bipolar RF power transistor designs to modern high-performance RF MOSFET technology.

RF Boneyard™ Note: The SD2931 represents an important milestone in RF power semiconductor development and remains one of the most recognized RF power MOSFET families among amplifier builders, service technicians, and radio enthusiasts worldwide.