Infineon Technologies PTFA240451E V1 R250

Overview

PTFA240451E from Infineon is a thermally-enhanced, internally matched LDMOS RF power transistor designed for base station final-stage amplification in CDMA2000 and WiMAX systems operating from 2420–2480 MHz. It delivers 45 W average output power at 28 V, 450 mA quiescent current, with 14 dB typical gain and –45 dBc adjacent channel power ratio under three-carrier CDMA2000 conditions.

For engineers reviewing the PTFA240451E datasheet, PTFA240451E pinout, PTFA240451E application, or PTFA240451E equivalent, key selection criteria include broadband internal matching (2420–2480 MHz), 10:1 VSWR ruggedness at 45 W CW, integrated Class 2 HBM ESD protection, thermal resistance of 0.89 °C/W, and gold-metallized reliability for high-reliability RF infrastructure.

Technical Context

This LDMOS FET operates as a single-ended, high-efficiency RF power amplifier stage with fixed gate biasing (V_GS = 2.0–3.0 V at I_DQ = 450 mA). Its internal broadband matching eliminates external input/output matching networks across 2420–2480 MHz, enabling compact PCB layouts in macrocell and microcell base station transceivers.

The device uses full gold metallization and thermally-enhanced H-30265-2 slotted-flange packaging to sustain junction temperatures up to 200 °C. It supports multi-tone, OFDM, and CDMA modulation schemes with verified IMD performance (–30 dBc third-order at 45 W PEP) and stable gain flatness (±0.5 dB over 60 MHz bandwidth).

Key Specifications

Pinout & Package

Package: H-30265-2 - Thermally-enhanced slotted flange, single-ended metal-ceramic package with solderable flange for direct heatsink mounting and low-inductance source grounding.

Key Features

Applications

Equivalent & Alternatives

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

Compared with PTFA240451F, the PTFA240451E offers identical RF performance but slightly higher thermal resistance-acceptable for most macrocell deployments where heatsink design accommodates 0.04 °C/W difference. Against MRF6VP2450HR5, it provides superior broadband matching and better ACPR at 2450 MHz but lacks extended voltage rating.

Availability

PTFA240451E is available at Aetrix Electronics and suitable for CDMA2000 base stations, WiMAX fixed wireless access nodes, and microcell small cell amplifiers requiring stable component supply, long-lifecycle support, and traceable sourcing for telecom infrastructure programs.

Supply support for PTFA240451E 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 leadership in high-reliability RF power solutions for telecommunications infrastructure.

The PTFA series targets high-efficiency, thermally robust RF power transistors for 4G/LTE and pre-5G base station applications, emphasizing broadband matching, ruggedness, and gold-metallized longevity in outdoor environments.

FAQ

What is the recommended gate bias voltage range for linear operation?

The PTFA240451E requires a gate-source voltage of 2.0–3.0 V at 450 mA quiescent drain current for optimal linearity in CDMA2000 and WiMAX modes. Bias stability is maintained across –20°C to +100°C case temperature, with normalized V_GS drift < ±3% over that range per the datasheet's bias voltage vs. temperature curve.

Can this device be used in pulsed RF applications?

Yes-the PTFA240451E supports pulsed operation with duty cycles down to 10% and pulse widths ≥10 µs, provided peak drain current remains within 196 W total dissipation limits and gate drive avoids negative voltage excursions beyond –0.5 V. Pulse testing data is documented in Infineon's characterization reports for radar and TDD-LTE use cases.

Is external input/output matching required?

No-internal broadband matching covers 2420–2480 MHz fully, as confirmed by S-parameter measurements in the datasheet. The reference circuit shows only DC blocking, bias filtering, and harmonic suppression; no impedance transformers or stubs are needed for nominal operation in this band.

What is the maximum safe operating drain voltage?

The absolute maximum drain-source voltage is 65 V, but continuous operation above 28 V is not recommended for linear RF amplification due to accelerated HCI degradation and reduced reliability. The device is characterized and qualified for 28 V supply in all published RF performance data.