STMicroelectronics PD55003S

Overview

PD55003S from STMicroelectronics is an N-channel enhancement-mode lateral MOSFET RF power transistor in common-source configuration, designed for broadband commercial and industrial RF amplification up to 1 GHz. It delivers 3 W output power with 17 dB gain at 500 MHz under 12.5 V supply and 50 mA quiescent drain current, featuring excellent thermal stability and linearity optimized for car mobile radio transmitters.

For engineers reviewing the PD55003S datasheet, PD55003S pinout, PD55003S application, or PD55003S equivalent, key selection criteria include its PowerSO-10RF straight-lead package thermal resistance (3.0 °C/W), 40 V drain-source breakdown voltage, 1.0 mho forward transconductance, 36 pF input capacitance at 12.5 V, and verified 52% drain efficiency at 3 W output.

Technical Context

The PD55003S operates in common-source mode with gate-controlled lateral conduction, leveraging ST's LDMOS technology for high gain and linearity across 480–900 MHz bands. Its S-parameter data confirms stable small-signal gain (17–26 dB) and input return loss >10 dB up to 1 GHz at multiple bias points (IDQ = 0.15 A, 0.8 A, 1.5 A).

Thermal design is anchored by a 3.0 °C/W junction-to-case resistance and 165 °C maximum junction temperature, enabled by the PowerSO-10RF straight-lead plastic package - ST's first JEDEC-approved high-power SMD RF package, optimized for RF impedance matching and reflow compatibility.

Key Specifications

Pinout & Package

PD55003S uses the PowerSO-10RF straight-lead plastic package - a JEDEC-qualified, surface-mount RF power package with gull-wing–compatible lead geometry, optimized for thermal performance and RF impedance control. Dimensions: 9.5 mm × 15.4 mm × 3.5 mm (L × E × A2), with 0.8–1.1 mm lead length and 0.23–0.32 mm lead thickness.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MRF300AN and PD55008S, PD55003S offers optimal balance of 3 W output, 17 dB gain, and 3.0 °C/W thermal resistance in a compact SMD package - making it uniquely suitable for space-constrained, battery-adjacent, and thermally isolated RF modules where efficiency and size are prioritized over raw power.

Availability

PD55003S is available at Aetrix Electronics and suitable for car mobile radio transmitters, UHF land mobile radio base stations, VHF aircraft communication transceivers, and industrial wireless sensor network hubs requiring stable component supply across extended production lifecycles.

Supply support for PD55003S 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 solutions for automotive, industrial, and communications markets.

PD55003S belongs to ST's LdmoST Plastic family of RF power transistors - engineered specifically for high-efficiency, broadband, thermally robust amplification in mobile and infrastructure radio equipment.

FAQ

What is the recommended gate bias voltage for PD55003S in Class AB operation?

The datasheet specifies V_GS(Q) = 2.0–5.0 V at I_D = 50 mA and V_DS = 10 V. For stable Class AB operation at 12.5 V drain supply, a nominal gate bias of 3.5 V is used with a 15 Ω series gate resistor and 0.1 µF bypass capacitor to suppress oscillation and ensure thermal stability across temperature.

Can PD55003S be used at 900 MHz with 3 W output?

Yes - measured data shows P_OUT = 2.8 W and G_P = 12 dB at 900 MHz under identical 12.5 V/50 mA conditions. The device maintains >10 dB input return loss and 40% drain efficiency, confirming usability in GSM/EDGE base station driver stages with minor output matching adjustment.

How does the PowerSO-10RF straight-lead package differ electrically from the formed-lead version?

Electrical performance is identical between PD55003 (formed lead) and PD55003S (straight lead); only mechanical dimensions differ - notably E (overall width) increases from 14.1 mm to 15.4 mm. Straight-lead variant improves solder joint reliability in high-vibration environments but requires adjusted stencil aperture for reflow.

Is external harmonic filtering required for FCC Part 90 compliance?

Yes - while PD55003S achieves –40 dBc second-harmonic suppression at 500 MHz, FCC Part 90 mandates <–60 dBc for narrowband FM transmitters. A two-pole LC low-pass filter (e.g., 12 nH + 12 pF) after the output matching network is required to meet spectral mask requirements in licensed land mobile bands.