STMicroelectronics SD57045-01

Overview

SD57045-01 from STMicroelectronics is a common-source N-channel enhancement-mode lateral MOSFET RF power transistor designed for broadband base station amplifiers up to 1.0 GHz. It delivers 45 W output power at 945 MHz with 13 dB gain and 33–40% drain efficiency at 28 V supply, operating with 250 mA quiescent drain current and exhibiting excellent thermal stability in BeO-free packaging.

For engineers reviewing the SD57045-01 datasheet, SD57045-01 pinout, SD57045-01 application, or SD57045-01 equivalent, key selection criteria include its 65 V V(BR)DSS rating, 1.4 °C/W junction-to-case thermal resistance, 93 W power dissipation at T_c = 70°C, and proven linearity (IMD3 = –32 to –28 dBc) in PEP operation for cellular infrastructure.

Technical Context

This device operates exclusively in common-source configuration with fixed gate biasing, optimized for Class AB linear amplification in 925–965 MHz LTE and GSM base station front-ends. Its lateral MOSFET structure enables stable gain flatness (±1 dB over 40 MHz bandwidth) and robust load mismatch tolerance (10:1 VSWR survivability).

The transistor features low feedback capacitance (C_RSS = 3.2 pF), high transconductance (G_FS = 2.0–2.7 mho), and input/output impedance data (e.g., Z_IN = 1.04 + j0.71 Ω at 945 MHz) enabling direct matching network design without external stabilization networks.

Key Specifications

Pinout & Package

SD57045-01 uses the M250 package: a 3-terminal, epoxy-sealed, flanged ceramic-metal hybrid housing measuring 5.71 × 9.40 × 1.70 mm (0.225 × 0.370 × 0.067 in), designed for low-inductance mounting and direct thermal coupling to heatsinks.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MRF6V2010N and BLF6G27LS-150, SD57045-01 offers optimal balance of 45 W output, compact M250 footprint, BeO-free safety, and proven 900 MHz linearity-making it ideal for cost-sensitive, thermally constrained, and regulatory-compliant infrastructure deployments.

Availability

SD57045-01 is available at Aetrix Electronics and suitable for macro base station transmitters, repeaters and distributed antenna systems, public safety radio infrastructure, and ISM band industrial amplifiers requiring stable component supply and long-term lifecycle support.

Supply support for SD57045-01 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 technologies for industrial, automotive, and communications markets.

The LdmoST family-including SD57045-01-is engineered specifically for high-efficiency, high-linearity RF power amplification in commercial wireless infrastructure, emphasizing thermal robustness, broadband matching, and BeO-free manufacturing compliance.

FAQ

What is the recommended gate bias voltage for linear operation at 45 W POUT?

The SD57045-01 achieves optimal linearity and efficiency at 45 W PEP with V_GS ≈ 3.5 V, corresponding to I_DQ = 250 mA at V_DS = 28 V. This bias point is validated in the datasheet's "Output Power vs Gate Bias Voltage" curve (page 4) and maintains IMD3 ≤ –30 dBc across temperature.

Can SD57045-01 operate safely into a 10:1 VSWR load mismatch?

Yes-the device is characterized to survive indefinite operation into 10:1 VSWR at all phase angles at 945 MHz and 45 W PEP, per datasheet page 2. This is enabled by its lateral MOSFET structure and thermal design, eliminating need for external circulators in many base station configurations.

What is the maximum allowable case temperature during continuous 45 W operation?

At 45 W POUT and 28 V supply, the maximum allowed case temperature is 70°C to maintain P_DISS ≤ 93 W (per Absolute Maximum Ratings). Exceeding 70°C reduces safe operating area; derating to 35 W is required at T_c = 100°C, as shown in the Safe Operating Area plot on page 3.

Does SD57045-01 require external gate protection diodes?

No-its gate oxide is rated for ±20 V V_GS, and the device includes integrated ESD protection sufficient for standard PCB handling and RF circuit environments. However, a 100 Ω series gate resistor and DC-blocking capacitor remain mandatory per application circuit guidelines (page 8).