STMicroelectronics SD2933W

Overview

SD2933W from STMicroelectronics is a gold-metalized N-channel RF power MOSFET in M177 hermetic package, designed for 50 V DC large-signal amplification up to 150 MHz. It delivers ≥300 W output power with ≥20 dB gain at 30 MHz, features 0.27 °C/W junction-to-case thermal resistance, and supports 3:1 load mismatch tolerance - deployed in industrial ISM RF heating systems.

For engineers reviewing the SD2933W datasheet, SD2933W pinout, SD2933W application, or SD2933W equivalent, key selection criteria include RF power handling at HF/VHF frequencies, thermal robustness under sustained duty cycles, gate drive voltage range (±40 V), and common-source configuration compatibility with broadband matching networks.

Technical Context

This device operates in common-source configuration with gold metallization ensuring stable interconnect performance under thermal cycling. Its low R_thJ-C (0.27 °C/W) enables high-power operation without external heatsink derating in forced-air-cooled ISM transmitters.

At 30 MHz, it achieves 300–400 W P_OUT, 20–23.5 dB power gain, and 50–65% drain efficiency with 250 mA quiescent drain current. Input impedance is 1.8 − j0.2 Ω; drain load impedance is 2.8 + j2.3 Ω - enabling direct integration into 50 Ω push-pull or single-ended amplifier stages.

Key Specifications

Pinout & Package

The SD2933W uses the M177 epoxy-sealed, 4-lead metal-ceramic hermetic package with flange mounting. Thermal path is optimized via direct case-to-heatsink conduction through the flanged base.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar RF power MOSFET applications.

Compared with BLF244 and MRF158, SD2933W uniquely balances 300 W output, 0.27 °C/W thermal resistance, and 3:1 VSWR tolerance - making it the only option qualified for unattended 24/7 operation in sealed industrial RF heating cabinets.

Availability

SD2933W is available at Aetrix Electronics and suitable for industrial RF heating systems, ISM band amplifiers, HF broadcast transmitters, and amateur radio linear amplifiers requiring stable component supply across extended production lifecycles.

Supply support for SD2933W includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in power management, analog, MEMS, and RF solutions for industrial, automotive, and consumer markets.

The SD2933W belongs to ST's high-reliability RF power transistor product line, engineered specifically for ruggedized operation in industrial ISM applications where thermal stability and load mismatch resilience are non-negotiable.

FAQ

What is the maximum safe operating temperature for SD2933W junction?

The SD2933W has a maximum operating junction temperature (T_J) of 200 °C, verified per absolute maximum ratings in Table 2. Operation above this threshold risks irreversible gate oxide damage and bond wire failure. For reliable 10-year field life, ST recommends limiting T_J to ≤150 °C using thermal modeling with the published R_thJ-C = 0.27 °C/W and actual case temperature measurements.

Can SD2933W be operated in Class D or E switching mode?

No - the SD2933W is characterized and qualified exclusively for linear Class AB/C RF amplifier operation at frequencies up to 150 MHz. Its SOA curve, avalanche ratings, and thermal model assume sinusoidal large-signal excitation. Switching-mode use violates safe operating area limits and voids ST's reliability guarantees due to uncharacterized turn-off energy dissipation and di/dt-induced voltage overshoot.

Is the M177 package RoHS-compliant?

Yes - the SD2933W M177 package meets RoHS Directive 2011/65/EU requirements per ST's ECOPACK® program. The device carries the "ECOPACK2" designation, indicating lead-free terminations, halogen-free molding compound, and compliance with JEDEC J-STD-020 reflow profiles. Full compliance documentation is available in ST's ECOPACK® database under order code SD2933W.

How is GFS sorting implemented on SD2933W units?

GFS sorting is performed during final test using standardized 10 A/10 V conditions per Table 4, with bins labeled A–H corresponding to 10–18 mho ranges (Table 5). The sort code appears as a laser-marked alphanumeric character (e.g., "B") adjacent to the part marking on the package flange, enabling gain-matched pairing for push-pull amplifier layouts without post-assembly characterization.