STMicroelectronics PD57018S

Overview

PD57018S from STMicroelectronics is an N-channel enhancement-mode lateral MOSFET RF power transistor in common-source configuration, designed for 925–960 MHz base station amplifiers. It delivers 18 W output power at 945 MHz with 16.5 dB power gain and 53% drain efficiency under 28 V supply and 100 mA quiescent current, housed in the JEDEC-approved PowerSO-10RF straight-lead plastic package.

For engineers reviewing the PD57018S datasheet, PD57018S pinout, PD57018S application, or PD57018S equivalent, key selection criteria include its 65 V drain-source breakdown voltage, 3.0 °C/W junction-to-case thermal resistance, 34.5 pF input capacitance, gate-source voltage range of ±20 V, and verified S-parameter performance up to 1.5 GHz under multiple bias conditions.

Technical Context

This device implements ST's LDMOS technology optimized for broadband RF power amplification in cellular infrastructure. Its lateral structure provides excellent thermal stability and linearity-critical for multi-carrier GSM/UMTS base station transmitters operating under high VSWR (10:1) conditions.

The PowerSO-10RF straight-lead package enables surface-mount assembly while maintaining low-inductance source grounding and efficient heat transfer via exposed drain pad. Impedance data (e.g., Z_IN = 0.53 − j0.86 Ω at 945 MHz) supports matching network design for narrowband and broadband PA stages.

Key Specifications

Pinout & Package

PD57018S uses the PowerSO-10RF straight-lead plastic package (JEDEC MO-235), featuring an exposed drain pad for thermal conduction and three main terminals: Gate (G), Source (S), and Drain (D). The package measures 9.5 mm × 15.4 mm × 1.67 mm (L × E × A2) with gull-wing–compatible lead geometry optimized for RF layout integrity.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MRF6V2150N and PD57003S, PD57018S uniquely balances 18 W output, proven LDMOS ruggedness, JEDEC-standard SMD packaging, and straightforward 28 V/Class AB biasing-making it optimal for mid-power 900 MHz infrastructure where reliability, manufacturability, and thermal simplicity are prioritized.

Availability

PD57018S is available at Aetrix Electronics and suitable for cellular base station transmitters, industrial RF heating systems, land mobile radio repeaters, and broadband wireless infrastructure requiring stable component supply and long-lifecycle support.

Supply support for PD57018S 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 technologies for industrial, automotive, and communications markets.

PD57018S belongs to ST's LdmoST Plastic family of RF power transistors, engineered specifically for high-efficiency, high-linearity amplification in 400 MHz–2.5 GHz cellular infrastructure equipment.

FAQ

What is the maximum safe operating drain voltage for PD57018S?

The absolute maximum drain-source voltage (V_(BR)DSS) is 65 V at T_CASE = 25 °C with V_GS = 0 V and I_DS = 10 mA. Operation above 28 V DC supply is permissible only during transient conditions within SOA limits; sustained operation must remain within 28 V for rated P_OUT and thermal safety.

Does PD57018S require external gate protection diodes?

No-PD57018S integrates internal gate protection and is rated for ±20 V gate-source voltage. However, external RC snubbers (e.g., 10 Ω + 100 pF) are recommended at the gate input to suppress RF-induced ringing and improve stability in broadband matching networks.

How does PD57018S differ from PD57018 (formed-lead version)?

PD57018S uses straight leads for standard SMT placement, while PD57018 uses formed (gull-wing) leads. Both share identical die, electrical specs, and thermal performance. Mechanical dimensions differ slightly-E dimension is 15.4 mm (PD57018S) vs. 14.1 mm (PD57018)-requiring separate PCB footprints.

Can PD57018S operate reliably at 1.2 A quiescent current?

Yes-S-parameter data confirms stable small-signal gain (S₂₁) and return loss (S₁₁) at I_DQ = 1.2 A and V_DS = 28 V across 50–1500 MHz. However, thermal derating is required: at 1.2 A, P_DISS rises significantly, limiting usable P_OUT unless case temperature is maintained below 55 °C.