STMicroelectronics PD55008TR

Overview

PD55008TR 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 8 W output power at 500 MHz with 17 dB gain and 55% drain efficiency under 12.5 V supply and 150 mA quiescent drain current, optimized for car mobile radio transmitters.

For engineers reviewing the PD55008TR datasheet, PD55008TR pinout, PD55008TR application, or PD55008TR equivalent, this device requires attention to gate-source voltage control (2.0–5.0 V), thermal resistance (1.8 °C/W), RF input/output impedance matching (e.g., ZIN ≈ 1.589 − j1.185 Ω @ 500 MHz), and PowerSO-10RF package mounting per AN1294.

Technical Context

The PD55008TR employs ST's LDMOS technology for high linearity and thermal stability in RF power stages. Its lateral structure enables excellent gain flatness across 480–520 MHz and supports load mismatch tolerance up to 20:1 VSWR at all phase angles.

It operates in common-source mode with fixed 12.5 V drain supply and adjustable gate bias (VGS(Q) = 2.0–5.0 V), delivering stable POUT from 3 W to 13 W depending on VDD and IDQ. Input return loss exceeds 10 dB across 500–900 MHz at typical bias conditions.

Key Specifications

Pinout & Package

PD55008TR is housed in the PowerSO-10RF plastic SMD package (gull-wing formed leads), JEDEC-approved for high-power RF applications. The package features low-inductance source grounding and optimized thermal path via exposed die paddle.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MRF6V2010N and PD57008, PD55008TR offers lower-cost 12.5 V operation and proven reliability in 450–520 MHz mobile radio, while trading off frequency range and GaN-level efficiency.

Availability

PD55008TR is available at Aetrix Electronics and suitable for car mobile radio transmitters, UHF industrial telemetry systems, AM/FM broadcast auxiliary links, and ISM-band signal generators requiring stable component supply and long-term lifecycle support.

Supply support for PD55008TR 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 analog, power, and RF solutions for automotive, industrial, and communications markets.

PD55008TR belongs to ST's LdmoST Plastic family of lateral RF power MOSFETs, engineered specifically for cost-sensitive, thermally constrained UHF transmitter applications demanding high linearity and ruggedness.

FAQ

What is the recommended gate bias voltage for linear operation?

The PD55008TR achieves optimal linearity at VGS(Q) = 3.5 V (typical) with IDQ = 150 mA and VDD = 12.5 V. This bias point yields 17 dB gain and 55% drain efficiency at 500 MHz. Gate voltage must remain within 2.0–5.0 V to avoid cutoff or excessive IDSS leakage, and should be stabilized using a low-noise, low-impedance source per AN1294 guidelines.

Can PD55008TR operate at 900 MHz?

Yes - the PD55008TR delivers 6 W POUT and 12 dB gain at 900 MHz with VDD = 12.5 V and IDQ = 150 mA, as confirmed by S-parameter data (S21 = 1.561 + j2.639 Ω). However, gain and efficiency decline above 520 MHz; for dedicated 800–900 MHz use, ST recommends the PD57008 as a direct-performance successor.

What thermal interface material is required for the PowerSO-10RF package?

A minimum 1.0 W/m·K thermally conductive epoxy or solder (e.g., Sn96.5/Ag3.0/Cu0.5) must bond the exposed thermal pad to a copper heatsink area ≥ 200 mm². Thermal resistance from junction to ambient must stay below 12 °C/W to maintain Tj ≤ 165 °C at 52.8 W dissipation, per the Rth(j-c) = 1.8 °C/W spec and AN1294 mounting instructions.

Is PD55008TR pin-compatible with PD55008S?

Yes - both share identical PowerSO-10RF footprint and pin assignment (GATE–SOURCE–DRAIN), differing only in lead form: PD55008TR uses formed gull-wing leads, while PD55008S uses straight leads. PCB land patterns are identical; reflow profiles differ slightly due to lead geometry, but no redesign is needed for board reuse.