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Home > Products > Discrete Semiconductor Products > Transistors > FETs, MOSFETs > Single FETs, MOSFETs

STMicroelectronics SD3933

Name: SD3933
Brand: STMicroelectronics
SKU: SD3933
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SD3933

Manufacturer:: STMicroelectronics

Category:: Single FETs, MOSFETs

Package:: M177

Datasheet:: SD3933.pdf

Description:: RF MOSFET 100V M177

Quantity:: RFQ Add To RFQ list

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Inventory:9,258

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Product details

Overview

SD3933 from STMicroelectronics is an N-channel enhancement-mode RF power MOSFET designed for HF/VHF/UHF linear amplifier stages in 100 V DC large-signal applications up to 200 MHz. It delivers ≥350 W output power with 29 dB power gain and 66% drain efficiency at 30 MHz, housed in a hermetically sealed M177 plastic package with five-terminal common-source configuration.

For engineers reviewing the SD3933 datasheet, SD3933 pinout, SD3933 application, or SD3933 equivalent, this device is selected for high-power RF transmitter final stages requiring thermal stability, load mismatch tolerance (3:1 VSWR), and robust avalanche energy rating (1000 mJ).

Technical Context

The SD3933 operates in common-source configuration with gate-controlled enhancement-mode conduction, optimized for Class AB or Class C RF amplification. Its static threshold voltage range (1.5–4.0 V) and transconductance (5–14 S) are sorted across 81 V_GS/g_FS bins to support precise biasing in production systems.

Dynamic performance is characterized at V_DD = 100 V, I_DQ = 250 mA, and f = 30 MHz, where it achieves 350 W P_OUT, 29 dB G_PS, and 66% drain efficiency. Input and load impedance data (e.g., Z_IN = 1.96 – j3.90 Ω, Z_DL = 8.73 + j5.94 Ω at 30 MHz) enable matching network design for broadband operation up to 200 MHz.

Key Specifications

Parameter	Value and Actual Design Meaning
V_(BR)DSS	250 V - Withstands 250 V drain-source breakdown under worst-case junction temperature (T_J = 150 °C), enabling safe operation in 100 V supply RF amplifiers with voltage headroom.
P_OUT @ 30 MHz	≥350 W - Minimum guaranteed RF output power into matched load at 30 MHz, defining usable power ceiling for HF band transmitters.
G_PS @ 30 MHz	25–29 dB - Small-signal power gain range supporting stable wideband amplification without external gain control circuitry.
Drain Efficiency	60–66% - Measured DC-to-RF conversion efficiency at P_OUT = 350 W, directly impacting thermal management and power supply sizing.
R_thJC	0.27 °C/W - Junction-to-case thermal resistance enables direct mounting to heatsinks; limits case temperature rise to ≤65.6 °C at 648 W dissipation.
E_AS	1000 mJ - Single-pulse avalanche energy rating ensures survivability during transient load mismatches or VSWR events up to 3:1.
f_MAX	200 MHz - Maximum usable frequency for large-signal operation, validated by impedance and gain data up to 100 MHz and extrapolated stability margin.

Pinout & Package

The SD3933 uses the M177 epoxy-sealed plastic package with five terminals arranged in a single-row layout. The package features a metal flange for direct thermal coupling to heatsinks and complies with ECOPACK® environmental standards.

Pin/Terminal	Circuit Role	Design Meaning
1	Drain	Main high-current RF output path; electrically and thermally connected to metal flange for low-inductance grounding and heat transfer.
2	Source	Common reference node for gate drive and RF return; tied to ground plane in amplifier PCB layout to minimize source inductance.
3	Gate	High-impedance control input; requires stable DC bias and RF decoupling to prevent oscillation and ensure repeatable transconductance behavior.
4	Source	Second source terminal providing redundant low-inductance connection to ground plane, critical for high-frequency current return paths.
5	Source	Third source terminal enhancing current distribution and reducing parasitic inductance in high-power RF output stage layouts.

Key Features

Feature	Design Value
Common-source configuration	Enables standard RF amplifier topology with grounded source, simplifying impedance matching and bias network implementation.
Excellent thermal stability	Guaranteed parameter consistency over T_J = −65 to +200 °C, minimizing gain drift and distortion in high-duty-cycle transmitters.
Load mismatch tolerance	Rated for continuous operation under 3:1 VSWR at all phase angles, eliminating need for external circulators or protection circuits in antenna-coupled systems.
V_GS/g_FS binning	81 discrete sorting codes (e.g., A1–J9) allow precise selection of threshold voltage (1.5–4.0 V) and transconductance (5–14 S) for production-matched amplifier modules.
Hermetic M177 package	Epoxy-sealed construction provides moisture resistance and mechanical robustness for industrial and broadcast RF environments.

Applications

HF Amateur Radio Transmitter

VHF FM Broadcast Booster

Use Scenario: Final-stage linear amplifier in 1.8–30 MHz HF transceivers delivering 350 W PEP output.

IC Role / Device Role / Timing Role: High-efficiency RF power switch operating in Class AB mode, driven by pre-driver stage and matched via L-network.

Use Value: Enables compact, air-cooled HF amplifiers with 66% efficiency and 29 dB gain-reducing driver stage complexity and power supply requirements.

Use Scenario: 30–100 MHz FM broadcast auxiliary transmitter boosting signal to 350 W ERP for local coverage extension.

IC Role / Device Role / Timing Role: Final RF power stage biased for high linearity and spectral purity, with harmonic filtering integrated post-drain.

Use Value: Delivers certified spectral mask compliance at full power due to stable g_FS and low intermodulation distortion across temperature.

UHF Land Mobile Radio Base Station

RF Plasma Generator Driver

Use Scenario: 400–500 MHz repeater output stage in public safety radio infrastructure requiring high reliability and thermal resilience.

IC Role / Device Role / Timing Role: Switch-mode RF power device operating in pulsed Class C mode with duty cycle up to 50%, controlled by baseband envelope modulation.

Use Value: Survives repeated 3:1 VSWR events during antenna switching or cable fault conditions without degradation, extending field service life.

Use Scenario: 13.56 MHz or 27.12 MHz RF power stage in industrial plasma etching and coating systems demanding continuous 350 W delivery.

IC Role / Device Role / Timing Role: High-current RF switch modulating 100 V DC supply into resonant tank circuit, synchronized to plasma ignition timing.

Use Value: 1000 mJ avalanche energy rating prevents failure during plasma arc re-ignition transients, eliminating need for external snubbers.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MRF151G	Lower P_OUT (200 W @ 30 MHz), higher R_thJC (0.35 °C/W), TO-247 package with 3 pins.	Limited to medium-power HF amplifiers; lacks multi-source-pin layout for low-inductance VHF/UHF grounding.	Select when cost sensitivity outweighs power/thermal performance; verify matching network redesign for lower gain and impedance.
BLF188XR	Higher frequency rating (up to 1 GHz), GaN-on-SiC process, 400 W P_OUT but requires −2.5 V gate bias and complex gate driver.	Suitable for UHF/SHF broadband amplifiers; incompatible with legacy 0–10 V gate drive architectures.	Choose only for new designs targeting >500 MHz operation; avoid drop-in replacement due to gate polarity and thermal interface differences.

Compared with MRF151G and BLF188XR, the SD3933 offers optimal balance of proven HF/VHF power density, simple positive-gate biasing, and five-source-pin layout for minimal layout-induced instability-making it preferred for industrial RF amplifiers where reliability and design reuse are critical.

Availability

SD3933 is available at Aetrix Electronics and suitable for HF amateur radio transmitters, VHF broadcast boosters, and UHF land mobile radio base stations requiring stable component supply across extended production lifecycles.

Supply support for SD3933 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, analog, MEMS, and microcontroller technologies for industrial, automotive, and communications markets.

The SD3933 belongs to ST's high-voltage RF power MOSFET product line, engineered specifically for ruggedized HF/VHF/UHF transmitter final stages where thermal stability, avalanche robustness, and production binning are essential.

FAQ

What is the maximum safe operating frequency for the SD3933 in large-signal RF applications?

The SD3933 is characterized and rated for large-signal operation up to 200 MHz, with verified performance data (gain, efficiency, impedance) provided through 100 MHz and validated stability margin beyond. Operation above 200 MHz is not supported by datasheet specifications and risks gain collapse or thermal runaway.

Can the SD3933 be used in Class D or E switching configurations?

No-the SD3933 is optimized for linear Class AB and Class C RF amplification, not hard-switching topologies. Its body diode recovery characteristics and gate charge profile are not specified for zero-voltage or zero-current switching, and using it in Class D/E may cause excessive switching losses or failure.

How does the five-terminal source configuration improve RF performance?

The three dedicated source terminals (pins 2, 4, 5) reduce total source inductance by distributing high-frequency return current across parallel paths, minimizing unwanted phase shift and gain peaking. This layout is critical for maintaining stability and consistent S-parameters above 30 MHz.

Is the SD3933 RoHS-compliant and lead-free?

Yes-the SD3933 is manufactured in ST's ECOPACK®-compliant M177 package, meeting RoHS Directive 2002/95/EC and subsequent amendments. Lead-free soldering profiles and halogen-free materials are fully documented in ST's ECOPACK® specification reports.

SD3933 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: M177

Packaging:: Tray

Product Status:: Active

Technology:: MOSFET (Metal Oxide)

Configuration:: N-Channel

Frequency:: 30MHz

Gain:: 29dB

Voltage - Test:: 100 V

Current Rating (Amps):: 20A

Noise Figure:: -

Current - Test:: 250 mA

Power - Output:: 350W

Voltage - Rated:: 250 V

Grade:: -

Qualification:: -

Mounting Type:: -

Supplier Device Package:: M177

SD3933 FAQ

1.How can I place an order for SD3933 through Aetrix?

Please submit a Request for Quotation (RFQ) for SD3933 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for SD3933 reliable?

The price and inventory of SD3933 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SD3933 is usually 5 days.

3.What payment methods are accepted for SD3933?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SD3933 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SD3933?

SD3933 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SD3933 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for SD3933?

For technical support, including SD3933 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SD3933 requirements.

6.How does Aetrix verify that SD3933 is sourced from the original manufacturer or authorized distributors?

All SD3933 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SD3933 meets industry standards.

7.What is the process for return or replacement of SD3933?

All SD3933 units undergo pre-shipment inspection (PSI). If there is an issue with SD3933, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The SD3933 part is unused and in its original packaging.

Return procedure for SD3933:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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