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SD2931-11MR
SD2931-11MR
| Part Number | SD2931-11MR |
|---|---|
| Manufacturer | STMicroelectronics |
| Category | Discrete Semiconductor Products > Transistors > FETs, MOSFETs > RF MOSFETs |
| Description | 150W HF/VHF N-Channel Enhancement Mode RF Power DMOS Transistor, 50V Operation, M174 Moisture Resistant Hermetic Flange Package. |
| Stock Status | In Stock |
| Origin | Original Factory |
Product Overview
The SD2931-11MR is a gold-metallized N-channel vertical RF power DMOS transistor from STMicroelectronics. The suffix “MR” represents Moisture Resistant. Its optimized packaging tolerates humidity cycling and harsh storage conditions, delivering around 25% lower thermal resistance than standard SD2931-10 / SD2931-11. Designed for high-reliability CW and pulsed HF/VHF amplifiers, it provides minimum 150W RF output power up to 230MHz at 50V supply voltage.
Core Advantages
Moisture Resistant Hermetic Packaging
M174 (SOT121A) epoxy hermetic flange package, adapted for harsh environments to boost long-term stability.
Excellent Load Mismatch Ruggedness
Supports 20:1 full-phase VSWR tolerance, protecting the chip against antenna open/short circuit faults.
Low Thermal Resistance
0.45°C/W junction-to-case thermal resistance, outstanding heat dissipation for continuous power operation.
Stable Electrical Performance
Gold metallization & common-source layout, consistent gain and efficiency over HF and VHF bands.
Key Specifications
| Brand | STMicroelectronics |
|---|---|
| RoHS Status | RoHS Compliant / Lead-Free / Green |
| EDA/CAD | Symbol, Footprint & 3D Model Available |
| Warranty | 1-Year Standard Quality Warranty |
| Package / Case | M174 (SOT121A) Hermetic Moisture Resistant Ceramic Flange Package, 4 pins |
| Mounting Type | Chassis Mount / Flange Bolt-Down Mounting |
| Surface Marking / Silkscreen | SD2931-11MR Marking |
| Transistor Technology | N-Channel Enhancement Mode DMOS Silicon MOSFET, Gold Metallization |
| Drain-source Voltage (Vdss) | 125 V |
| Gate-source Voltage (Vgss) | ±20 V |
| Continuous Drain Current (Id) | 20 A |
| Power Dissipation (Pd) | 389 W (Tc=25°C) |
| Junction-to-Case Thermal Resistance (Rth(jc)) | 0.45 °C/W |
| Frequency Range | HF / VHF Spectrum (DC to 230 MHz) |
| Output Power | 150 W (Min. at VDD = 50V, f = 175MHz) |
| Operating Drain Voltage | 50 V DC (Nominal) |
| Power Gain | Typ. ≥ 14 dB @ 175 MHz |
| Drain Efficiency | Typ. ≥ 55% @ 175 MHz |
| Operating Junction Temperature | -65°C ~ +200°C |
| Storage Temperature | -65°C ~ +150°C |
| Pin Definition | 1-Drain, 2-Source, 3-Gate, 4-Source |
| Packaging Format | Tray / Anti-Static Protective Box |
Typical Applications
- HF/VHF commercial broadcast RF power amplifiers
- ISM band industrial high-power RF generators
- Amateur radio linear power amplifiers
- Pulsed & Continuous-wave high reliability RF transmission equipment
- Military and marine communication HF/VHF power modules
Order & Shipping Info
| Minimum Order Quantity (MOQ) | 1 Piece |
|---|---|
| Lead Time | Ship within 1-2 working days |
| Transit Time | 3-7 working days worldwide |
| Shipping Options | DHL, UPS, FedEx, EMS |
| Payment Options | T/T, PayPal, Credit Card, Western Union |
Technical Support
Please use our inquiry form to request datasheets, sample quotation, BOM matching or bulk pricing. We will reply within 24 hours.
Frequently Asked Questions
Q1: What is the operating voltage of SD2931-11MR?
A1: Nominal operating drain voltage is 50V DC. The maximum drain-source breakdown voltage is 125V to resist transient surges.
Q2: What is the working frequency range?
A2: Stable operation up to 230MHz. Key performance parameters are tested at 175MHz (VHF band).
Q3: Difference between SD2931-11MR and SD2931-10 / SD2931-11?
A3: -MR stands for Moisture Resistant hermetic version. Thermal resistance reduces by about 25% with superior humidity tolerance. Electrical parameters are consistent, can be used as upgraded alternative for high-reliability projects.
Q4: Can SD2931-11MR directly replace SD2931-12MR?
A4: Yes. They are electrically identical and pin-to-pin compatible. Only factory internal order marking differs, no circuit modification required.
Q5: What similar models can be used as alternatives?
A5: SD2932, SD2933 are optional alternatives. Note the differences in power, gain and impedance. Matching network retuning and prototype testing are necessary before replacement.
Q6: Can the device withstand antenna short-circuit failure?
A6: It supports 20:1 full-phase VSWR mismatch. Adequate heatsink is required under long-time extreme mismatch to avoid overheating damage.
Q7: What are the temperature limitations?
A7: Operating junction temperature: -65°C ~ +200°C; Storage temperature: -65°C ~ +150°C. Do not exceed the max junction temperature for longer service life.
Q8: Is M174 package interchangeable with M244?
A8: No. SD2931-11MR adopts M174 (SOT121A) flange package. M244 is an independent package used for SD2931-11W, mechanically incompatible.
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