STMicroelectronics SD57030-01

Overview

SD57030-01 from STMicroelectronics is an N-channel enhancement-mode lateral MOSFET RF power transistor in the LdmoST family, configured in common source topology, delivering 30 W output power with 13 dB gain at 945 MHz and 50% drain efficiency under 28 V supply, designed for base station amplifiers requiring high linearity up to 1.0 GHz.

For engineers reviewing the SD57030-01 datasheet, SD57030-01 pinout, SD57030-01 application, or SD57030-01 equivalent, key selection criteria include thermal resistance (1.75 °C/W), gate threshold voltage (2.0–5.0 V), drain-source breakdown voltage (65 V), broadband gain flatness, and BeO-free M250 ceramic package compatibility with industrial RF power stages.

Technical Context

This device operates in common-source configuration with fixed 50 mA quiescent drain current, optimized for Class AB linear amplification at 945 MHz. Its lateral MOSFET structure provides excellent thermal stability and high transconductance (1.8 mho) enabling robust RF power delivery without gate current injection.

Designed for broadband operation up to 1 GHz, it features low input/output capacitance (CISS = 58 pF, COSS = 34 pF) and minimal feedback capacitance (CRSS = 2.7 pF), supporting stable wideband matching networks and tolerance to 10:1 VSWR load mismatch across all phase angles.

Key Specifications

Pinout & Package

The SD57030-01 uses the M250 epoxy-sealed ceramic package (0.230 × 0.360 inch, 2-lead non-hermetic with flange), featuring a metalized flange for direct thermal mounting and RF grounding. Pin numbering follows top-view orientation with leads labeled 1–3.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MRF158G, SD57030-01 delivers double output power and superior thermal performance; versus PD57030-E, it trades guaranteed gain floor for legacy qualification status-both share identical pinout and biasing.

Availability

SD57030-01 is available at Aetrix Electronics and suitable for macrocell base stations, ISM industrial RF systems, and public safety radio repeaters requiring stable component supply and long-term obsolescence management.

Supply support for SD57030-01 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, designing and manufacturing analog, power, and RF components for industrial, automotive, and communications markets.

The LdmoST RF power transistor product line targets high-efficiency, high-linearity broadband amplification in wireless infrastructure, emphasizing thermal robustness, BeO-free packaging, and ruggedized operation in harsh environments.

FAQ

What is the recommended gate bias network for SD57030-01?

A stable two-resistor voltage divider with bypass capacitor is recommended: R1 = 18 kΩ from VGG to gate, R2 = 4.7 MΩ from gate to source, plus a 100 nF ceramic capacitor from gate to source. This sets IDQ ≈ 50 mA at VDD = 28 V and ensures immunity to thermal drift per the VGS(Q) range of 2.0–5.0 V.

Can SD57030-01 operate safely with 50 V drain supply?

No. The absolute maximum V(BR)DSS is 65 V, but the device is characterized and qualified only at VDD = 28 V. Operating above 28 V risks exceeding safe SOA limits during RF signal peaks and violates the specified test conditions for POUT, GPS, and ηD - derating is not documented.

Is external ESD protection required on the gate terminal?

Yes. Although IGSS is limited to 1 µA at VGS = 20 V, the gate oxide is susceptible to ESD damage. A 100 Ω series resistor and 100 pF shunt capacitor at the PCB entry point are recommended per STMicroelectronics application note AN280, especially in automated assembly environments.

Does SD57030-01 require RF chokes on drain and gate lines?

Yes. The test circuit uses air-wound inductors (L1/L2) for DC feed and RF isolation. A minimum 10 µH RF choke is required on the drain line to prevent RF leakage into the DC supply, and a 100 µH choke on the gate line ensures stable bias under RF drive - both must be rated for ≥100 mA DC current.