STMicroelectronics PD55003

Overview

PD55003 from STMicroelectronics is a common-source, N-channel enhancement-mode lateral MOSFET RF power transistor designed for broadband commercial and industrial applications 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, features 40 V drain-source breakdown voltage, 31.7 W power dissipation at 70°C case temperature, and is optimized for car mobile radio amplification.

For engineers reviewing the PD55003 datasheet, PD55003 pinout, PD55003 application, or PD55003 equivalent, this device is selected for high-linearity RF final-stage amplification in VHF/UHF transceivers, where thermal stability, SMD assembly compatibility, and load mismatch tolerance (20:1 VSWR) are critical design requirements.

Technical Context

The PD55003 employs ST's LDMOS technology in a lateral structure, enabling excellent thermal stability and high gain across 50–1500 MHz. Its common-source configuration supports broadband matching via microstrip networks, with measured S-parameters confirming >17 dB power gain and <−10 dB input return loss at 500 MHz under 12.5 V/50 mA bias.

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

Key Specifications

Pinout & Package

The PD55003 is housed in the PowerSO-10RF plastic package (formed-gull-wing lead), a JEDEC-qualified SMD RF power package with integrated thermal pad and optimized RF lead inductance. Dimensions include overall width 9.5 mm (max), length 14.1 mm (typ), and stand-off height ≤0.1 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MRF6V2010NT1, PD55003 offers lower-voltage operation and SMD compatibility for compact mobile designs; compared with PD57003, it trades 2 W output and 5% efficiency for proven field reliability and cost-sensitive production readiness.

Availability

PD55003 is available at Aetrix Electronics and suitable for car mobile radio transmitters, VHF/UHF land mobile radios, ISM band industrial amplifiers, and RF test equipment drivers requiring stable component supply across multi-year production cycles.

Supply support for PD55003 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, digital, and mixed-signal ICs for automotive, industrial, and consumer markets.

The PD55003 belongs to ST's LdmoST Plastic family of RF power transistors, engineered specifically for high-gain, high-linearity, thermally robust amplification in commercial and industrial wireless infrastructure.

FAQ

What is the recommended gate bias network for PD55003 in Class AB operation?

The official test circuit uses a 15 Ω series resistor (R1), parallel 0–20 pF trimmer capacitor (C2/C3), and 1 kΩ pull-down (R2) to set V_GS ≈ 2.5–3.5 V for 50 mA I_DQ. Gate voltage must remain within ±20 V absolute maximum, and DC blocking capacitors (C9/C16) isolate RF from bias lines.

Can PD55003 operate reliably at 860 MHz, and what output power is achievable?

Yes - datasheet Figure 8 confirms 3 W P_OUT at 860 MHz with 12.5 V supply and 50 mA bias. Measured drain efficiency drops to ~40%, and gain decreases to ~14 dB, but the device remains fully functional and thermally stable per its 165°C T_j rating.

How does the PowerSO-10RF package differ from standard SO-10 or TO-252 in RF applications?

PowerSO-10RF integrates an exposed thermal pad, controlled lead inductance (<0.5 nH per lead), and optimized die attach for RF impedance control. Unlike SO-10, it supports >30 W power dissipation and is JEDEC-qualified for RF; unlike TO-252, it enables automated SMD assembly without wire bonding.

Is PD55003 suitable for pulsed RF operation, and what are the key derating considerations?

Yes - absolute maximum ratings allow 2.5 A pulsed drain current. For pulsed operation, average power must stay below 31.7 W at T_c = 70°C, duty cycle must limit junction temperature rise, and gate drive must avoid exceeding ±20 V during transitions. Thermal transient response is governed by R_th(j-c) = 3.0 °C/W.