Product Datasheet
Download the attached PDF/image reference for pinout, specs, service notes, or bench reference.
Open Datasheet / PDFSD2918 RF MOSFET Driver
$75.00
This listing is for one ST SD2918 RF MOSFET driver transistor
The SD2918 is a hard-to-find RF MOSFET commonly sought after for HF radio repair, RF driver stages, amplifier work, and technician bench stock. This part is being sold as old stock and has been checked on a bench semiconductor analyzer for basic MOSFET health.
The device was detected as showing normal N-channel MOSFET behavior. Bench readings showed 0 µA gate leakage, low off-current, normal body diode response, and stable small-signal test results.
This part has not been RF load tested. RF output power, gain, bias stability under load, and installed equipment performance are not guaranteed unless specifically stated. Buyer must verify compatibility, mounting, bias setup, and installation requirements before use.
Because RF MOSFETs can be damaged by static, improper biasing, bad soldering, poor grounding, mismatch, high SWR, or incorrect installation, this item is sold for qualified technicians, radio repair use, and experienced electronics buyers.
Compatible Radios / Boards
Compatablie radios yeasu FtDX9000 FTDX 5000
Vintage Semiconductor History – STMicroelectronics SD2918 RF Power MOSFET
The SD2918 RF power MOSFET 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 single global company.
The SD2918 became a widely respected high-power RF transistor used in commercial communications equipment, broadcast transmitters, industrial RF systems, amateur radio amplifiers, and other demanding RF power applications. Its rugged construction, reliability, and RF performance helped establish it as a popular choice among equipment manufacturers and amplifier designers.
Today the SD2918 is considered an obsolete semiconductor and is no longer in regular production. Original devices remain sought after by repair technicians, amplifier builders, radio restorers, and collectors maintaining legacy RF equipment. The device family is particularly well known within the amateur radio community, where it appeared in numerous high-performance RF amplifier designs and transceiver power amplifier stages.
Many amateur radio operators recognize the SD2918 as the RF power device used in several premium transceivers and amplifier designs from the late 1990s and 2000s, further contributing to its reputation among enthusiasts and service technicians.
RF Boneyard™ Note: The SD2918 represents an important chapter in the evolution of modern RF power MOSFET technology and remains a recognized part among technicians servicing classic amateur radio, commercial communications, and broadcast equipment.
RF Boneyard Bench Notes
SD2918 RF Boneyard Bnech Test Measured Results:
Vgs(on): 2.877 V
Ip: 5.03 mA
Ig: 0 µA
Vgs(off): 2.037 V
Leakage / low-current reading: 4.8 µA
gm: 23.9 mA/V
Additional Id/Ip reading: 3.0 mA to 5.0 mA test range
Rds(on): 1.5 ? at Ip = 5.0 mA
GS test voltage: 8.0 V
Body diode Vf: 0.65 V
Short product-page version:
Bench screened by RF Boneyard. Vgs(on) 2.877 V @ Ip 5.03 mA; Ig 0 µA; Vgs(off) 2.037 V; leakage 4.8 µA; gm 23.9 mA/V; Rds(on) 1.5 ? @ Ip 5.0 mA; GS 8.0 V; body diode Vf 0.65 V. No obvious short observed during basic electrical screening. Verify compatibility before installation.
Important: This is a bench-analyzer health check only. It does not prove RF output power, RF gain, bias stability under load, or authenticity under RF operating conditions.
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