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

STMicroelectronics SD2941-10

Name: SD2941-10
Brand: STMicroelectronics
SKU: SD2941-10
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SD2941-10

Manufacturer:: STMicroelectronics

Category:: Single FETs, MOSFETs

Package:: M174

Datasheet:: SD2941-10.pdf

Description:: RF MOSFET 50V M174

Quantity:: RFQ Add To RFQ list

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Product details

Overview

SD2941-10 from STMicroelectronics is a gold-metallized N-channel RF power MOSFET in M174 package, designed for HF/VHF/UHF large-signal amplifier stages operating up to 230 MHz at 28–50 V DC supply. It delivers ≥175 W output power with ≥14 dB gain at 175 MHz/50 V, features 0.45 °C/W junction-to-case thermal resistance, and achieves 25% lower R_DS(on) versus industry standard devices.

For engineers reviewing the SD2941-10 datasheet, SD2941-10 pinout, SD2941-10 application, or SD2941-10 equivalent, this device is selected for high-reliability ISM band amplifiers, broadband RF transmitters, and ruggedized 28–50 V RF power stages where thermal stability, load mismatch tolerance (10:1 VSWR), and low on-resistance are critical design requirements.

Technical Context

The SD2941-10 operates in common-source configuration with gate-controlled RF power switching and linear amplification capability. Its gold metallization ensures stable interconnect performance under thermal cycling, while the M174 non-pedestal epoxy-sealed package enables direct heatsink mounting and minimizes thermal interface resistance.

It supports wideband operation from 30 MHz to 230 MHz with verified impedance matching points: Z_IN = 1.2 – j3.3 Ω at 123 MHz/28 V and Z_DL = 2.0 + j2.4 Ω at 175 MHz/50 V. Load mismatch resilience is confirmed at 10:1 VSWR across all phase angles at full rated P_OUT.

Key Specifications

Parameter	Value and Actual Design Meaning
V_BRDSS	130 V - Withstands 130 V drain-source breakdown at T_J = 150 °C, enabling safe operation in 50 V supply systems with transient margin.
P_OUT	175 W min. @ 175 MHz, 50 V - Delivers usable RF output power for Class AB/C ISM amplifiers without derating.
G_PS	14 dB min. @ 175 MHz, 50 V - Provides sufficient small-signal gain to drive subsequent stages with minimal external amplification.
R_thJC	0.45 °C/W - Enables direct heatsink coupling with predictable junction temperature rise under continuous 389 W dissipation limit.
R_DS(on)	2.0 V @ V_GS = 10 V, I_D = 10 A - Low conduction loss improves efficiency and reduces thermal stress in high-current RF output stages.
CISS	415 pF @ V_DS = 50 V, f = 1 MHz - Defines input capacitance affecting matching network design and gate drive requirements.
Load Mismatch	10:1 VSWR @ 175 MHz, 50 V - Sustains full rated output power into highly reactive or unmatched loads without failure.

Pinout & Package

The SD2941-10 is housed in the thermally enhanced M174 non-pedestal epoxy-sealed package (Ø0.500", 4-lead), optimized for low thermal resistance and direct heatsink mounting. Pin 1 = Drain, Pin 2 = Source, Pin 3 = Gate, Pin 4 = Source (dual-source configuration).

Pin/Terminal	Circuit Role	Design Meaning
1 (Drain)	RF Power Output Terminal	High-current drain connection; electrically and thermally coupled to case for heatsink mounting.
2 (Source)	Common Source Reference	Primary source terminal tied to ground reference in common-source amplifier topology.
3 (Gate)	RF Input Control Terminal	High-impedance control node requiring matched input impedance (Z_IN = 1.2 – j3.3 Ω @ 123 MHz).
4 (Source)	Secondary Source Terminal	Dual-source configuration reduces source inductance and improves high-frequency stability and gain flatness.

Key Features

Feature	Design Value
Gold metallization	Ensures long-term bond-wire reliability and corrosion resistance under thermal cycling in high-power RF environments.
Thermally enhanced M174 packaging	Reduces R_thJC by 25% vs industry standard, lowering junction temperature rise by >10 °C at 175 W output.
Common-source configuration	Supports standard RF amplifier topologies with single-ended input/output and grounded-source biasing.
Low R_DS(on)	2.0 V @ 10 A enables higher efficiency and reduced conduction loss compared to legacy RF MOSFETs.
25:1 VSWR tolerance @ 123 MHz	Allows operation into severely mismatched loads (e.g., antenna detuning) without device degradation or oscillation.

Applications

ISM Band RF Amplifier

Broadband Transmitter Final Stage

Use Scenario: High-power RF amplification in industrial heating systems operating at 13.56 MHz or 27.12 MHz ISM bands.

IC Role / Device Role / Timing Role: Final-stage RF power transistor delivering 175 W output with 14 dB gain and 55–65% drain efficiency.

Use Value: Gold metallization and 200 °C max junction temperature ensure sustained operation under continuous thermal stress in sealed enclosures.

Use Scenario: Multi-band HF/VHF transmitter final amplifier covering 30–230 MHz with fixed-tuned or switched matching networks.

IC Role / Device Role / Timing Role: Common-source N-channel RF power MOSFET providing broadband gain and output power with stable impedance characteristics.

Use Value: Verified Z_IN and Z_DL data at 123/175 MHz enable accurate matching network design without empirical tuning.

Medical Diathermy System

Avionics HF Communication Amplifier

Use Scenario: RF energy delivery in therapeutic diathermy equipment requiring high reliability and load mismatch resilience.

IC Role / Device Role / Timing Role: Primary RF power switch in Class AB amplifier stage, driven by low-phase-noise oscillator and modulator.

Use Value: 10:1 VSWR tolerance at full power prevents fault conditions during variable tissue coupling and ensures patient safety compliance.

Use Scenario: Line-replaceable RF power module in airborne HF communication transceivers (2–30 MHz).

IC Role / Device Role / Timing Role: Ruggedized RF output transistor supporting MIL-STD-810G environmental profiles and EMI-hardened operation.

Use Value: M174 package meets mechanical shock/vibration requirements; 25% lower R_DS(on) extends MTBF in cyclic thermal environments.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SD2931-10	20% lower P_SAT, 25% higher R_DS(on), same M174 package and pinout.	Limited to ≤140 W output at 123 MHz/28 V; less suitable for 50 V ISM systems requiring >175 W.	Select when cost sensitivity outweighs peak power demand and thermal margin is constrained.
MRF158	Higher R_thJC (0.65 °C/W), lower P_OUT (120 W @ 175 MHz), TO-220AB package with insulated tab.	Requires isolation hardware and larger heatsink; not drop-in compatible due to different thermal path and pin layout.	Choose only if legacy board layout prohibits M174 footprint or if voltage rating <130 V suffices.

Compared with SD2931-10 and MRF158, the SD2941-10 provides superior thermal performance and output power headroom in the same footprint, making it optimal for new ISM and broadband designs where reliability under mismatched loads is mandatory.

Availability

SD2941-10 is available at Aetrix Electronics and suitable for ISM band amplifiers, broadband HF/VHF transmitters, and medical diathermy systems requiring stable component supply, long-lifecycle support, and traceable sourcing.

Supply support for SD2941-10 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, designing and manufacturing analog, microcontroller, power, and RF solutions for industrial, automotive, and consumer markets.

The SD2941-10 belongs to ST's high-power RF MOSFET product line, engineered specifically for ruggedized, high-efficiency amplifier stages in industrial, medical, and communications infrastructure where thermal robustness and load tolerance are non-negotiable.

FAQ

What is the maximum safe operating frequency for the SD2941-10?

The SD2941-10 is characterized and qualified for reliable operation up to 230 MHz, with full performance data provided at 30 MHz, 123 MHz, and 175 MHz. Its impedance and gain behavior remain stable across this range, and the device has been validated for broadband use in ISM and HF/VHF transmitters without frequency-dependent derating.

Does the SD2941-10 require external gate protection?

Yes - although the device specifies ±40 V gate-source voltage rating, its gate oxide is sensitive to ESD and transient overvoltage. ST recommends using a 10–22 Ω gate stopper resistor in series with the driver and a 12 V Zener clamp (e.g., BZX84-C12) between gate and source to prevent damage during hot-switching or mismatch events.

Can the SD2941-10 be used in Class D or E RF amplifier topologies?

No - the SD2941-10 is optimized for linear Class AB and Class C operation, with verified gain, efficiency, and load mismatch behavior in those modes. Its gate charge profile and output capacitance are not characterized for zero-voltage or zero-current switching transitions required in Class D/E, and no application notes support such usage.

Is the M174 package RoHS-compliant and lead-free?

Yes - the SD2941-10 is offered in ECOPACK®-compliant M174 packaging, meeting RoHS Directive 2011/65/EU and REACH SVHC requirements. The device carries the "ECOPACK2" designation per ST's environmental compliance documentation, with lead-free terminations and halogen-free molding compound.

SD2941-10 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: M174

Packaging:: Box

Product Status:: Obsolete

Technology:: MOSFET (Metal Oxide)

Configuration:: N-Channel

Frequency:: 175MHz

Gain:: 15.8dB

Voltage - Test:: 50 V

Current Rating (Amps):: 20A

Noise Figure:: -

Current - Test:: 250 mA

Power - Output:: 175W

Voltage - Rated:: 130 V

Grade:: -

Qualification:: -

Mounting Type:: -

Supplier Device Package:: M174

SD2941-10 FAQ

1.How can I place an order for SD2941-10 through Aetrix?

Please submit a Request for Quotation (RFQ) for SD2941-10 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 SD2941-10 reliable?

The price and inventory of SD2941-10 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SD2941-10 is usually 5 days.

3.What payment methods are accepted for SD2941-10?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SD2941-10 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SD2941-10?

SD2941-10 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SD2941-10 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 SD2941-10?

For technical support, including SD2941-10 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SD2941-10 requirements.

6.How does Aetrix verify that SD2941-10 is sourced from the original manufacturer or authorized distributors?

All SD2941-10 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 SD2941-10 meets industry standards.

7.What is the process for return or replacement of SD2941-10?

All SD2941-10 units undergo pre-shipment inspection (PSI). If there is an issue with SD2941-10, 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 SD2941-10 part is unused and in its original packaging.

Return procedure for SD2941-10:

1.Submit a request within 90 days.

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

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