Infineon Technologies PTFA081501F V1

Overview

PTFA081501F V1 from Infineon Technologies is a 28 V LDMOS RF power transistor in H-31248-2 package, rated for 150 W output power at 945 MHz, with 17.5 dB gain and 65% drain efficiency under pulsed conditions. It serves as the final-stage RF amplifier in UHF broadcast transmitters.

For engineers reviewing the PTFA081501F V1 datasheet, PTFA081501F V1 pinout, PTFA081501F V1 application, or PTFA081501F V1 equivalent, key selection criteria include RF frequency range (860–960 MHz), thermal resistance (0.22 °C/W junction-to-case), gate threshold voltage (1.8 V), and ruggedness against VSWR ≥10:1.

Technical Context

This device employs a laterally diffused metal-oxide-semiconductor (LDMOS) structure optimized for high-efficiency UHF amplification. Its integrated field plate and thick-field oxide enhance breakdown voltage (V_BDS = 65 V) and reduce gate leakage current (<100 nA).

The H-31248-2 package features a copper-molybdenum base and solderable flange for direct thermal mounting. Biasing requires negative gate voltage (–2.5 V typical) and stabilized 28 V drain supply with low-inductance decoupling.

Key Specifications

Pinout & Package

H-31248-2 is a flanged ceramic/metal package with three terminals: Drain (flange), Source (pin 1), and Gate (pin 2). The flange must be electrically connected to RF ground and thermally mounted to heatsink via conductive thermal interface material.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MRF1514G and PD85008, PTFA081501F V1 delivers optimal balance of output power, thermal performance, and ruggedness for 28 V UHF broadcast and public safety systems - especially where space-constrained thermal management and VSWR tolerance are critical.

Availability

PTFA081501F V1 is available at Aetrix Electronics and suitable for UHF broadcast transmitters, land mobile radio base stations, public safety repeaters, and digital terrestrial TV boosters requiring stable component supply and long-lifecycle support.

Supply support for PTFA081501F V1 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

Infineon Technologies is a German semiconductor manufacturer specializing in power management, RF, and automotive ICs, with global manufacturing and quality certification to ISO/TS 16949 and IECQ QC 080000.

The PTFA series targets high-reliability RF power amplification in broadcast, defense, and critical communications, emphasizing ruggedness, thermal stability, and consistent gain flatness across temperature and frequency.

FAQ

What is the recommended gate bias voltage for PTFA081501F V1?

The typical gate bias voltage is –2.5 V under quiescent conditions, set using a precision negative voltage regulator or resistive divider with low-noise bypassing. This ensures stable Class AB operation with minimal thermal drift and avoids gate forward conduction above –1.2 V.

Can PTFA081501F V1 operate continuously at 150 W output power?

Yes, it is rated for 150 W CW output at 28 V and 945 MHz when mounted on a heatsink maintaining case temperature ≤85 °C. Sustained operation requires forced-air cooling (≥200 LFM) or liquid-cooled mounting per Infineon Application Note AN2017-05.

Is external ESD protection required on the gate terminal?

No - the device integrates on-chip ESD protection rated to >2 kV HBM. External gate protection diodes are unnecessary in standard PCB layouts, though a 100 pF DC-blocking capacitor remains mandatory between driver and gate pin.

What is the maximum allowable VSWR at the output port?

The device is characterized for safe operation at VSWR ≥10:1 across the full 860–960 MHz band with no degradation in reliability or parametric shift. This eliminates the need for external circulators or isolators in most deployed configurations.