Infineon Technologies PTFA240451E V1

Overview

PTFA240451E V1 from Infineon is a thermally-enhanced, internally matched LDMOS RF power transistor designed for high-efficiency 2420–2480 MHz broadband amplification in CDMA2000 and WiMAX base station final stages. It delivers 45 W average output power at 28 V, 450 mA bias, 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 its 0.89 °C/W junction-to-case thermal resistance, 65 V drain-source breakdown rating, 10:1 VSWR ruggedness, and gold-metallized H-30265-2 slotted-flange package optimized for high-power RF thermal management.

Technical Context

This LDMOS FET operates as a Class AB RF power amplifier stage with fixed gate bias (V_GS = 2.5 V typ.) and requires external broadband matching networks. Its internal matching targets 50 Ω source/load impedances across 2420–2480 MHz, enabling simplified PCB layout while maintaining stable gain flatness (±0.5 dB) and efficiency consistency (31% typ. drain efficiency).

The device integrates ESD protection per HBM Class 2 (≥2 kV), exhibits low hot-carrier injection drift, and sustains full 45 W CW output into 10:1 VSWR loads without damage-critical for deployed infrastructure where antenna mismatch events occur.

Key Specifications

Pinout & Package

H-30265-2 is a thermally enhanced slotted flange, single-ended metal-ceramic package with integrated source-tab grounding and isolated drain pad. The flange is electrically connected to source and serves as primary thermal path and RF ground reference.

Key Features

Applications

Equivalent & Alternatives

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

Compared with PTFA240451F V1, this part offers identical RF performance with legacy qualification status; versus MRF6P24140HR5, it trades raw power for integration, thermal efficiency, and smaller footprint-ideal for space-constrained 2.4 GHz fixed wireless nodes.

Availability

PTFA240451E V1 is available at Aetrix Electronics and suitable for WiMAX base stations, CDMA2000 macro-cell transmitters, ISM-band infrastructure amplifiers, and fixed wireless access transmitters requiring stable component supply across multi-year deployment cycles.

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

The PTFA series belongs to Infineon's GOLDMOS® LDMOS portfolio, engineered specifically for broadband, high-efficiency, thermally robust RF power amplification in 2–3.8 GHz wireless infrastructure applications.

FAQ

What is the recommended gate bias voltage and stability requirement for PTFA240451E V1?

The device operates at a typical gate-source voltage of 2.5 V with ±0.5 V tolerance, requiring a low-noise, well-regulated bias supply. Gate current is <1 µA, so bias resistors must minimize thermal drift; a 1.3 kΩ/1.2 kΩ divider with 0.001 µF bypass is specified in the reference circuit for stable 2.5 V at 450 mA IDQ.

Can PTFA240451E V1 be used outside its specified 2420–2480 MHz band?

While small-signal gain extends beyond 2.4 GHz, full 45 W output power and –45 dBc ACPR are only guaranteed within 2420–2480 MHz. At 2500 MHz, gain drops ~0.8 dB and efficiency falls to 29%; operation below 2400 MHz risks impedance mismatch and reduced VSWR tolerance-use only with re-optimized matching networks.

What thermal interface material is recommended between the H-30265-2 flange and heatsink?

Infineon specifies a minimum thermal interface conductance of 1.2 W/(cm²·°C). Recommended materials include 0.08 mm thick graphite foil (e.g., Laird T-flex 400) or phase-change thermal pads (e.g., Henkel Gap Pad VOX 100) with 15–25 psi clamping pressure. Avoid silicone-based greases due to pump-out risk under thermal cycling.

Does PTFA240451E V1 require external ESD protection in the final PCB layout?

No-integrated HBM Class 2 ESD protection (≥2 kV) covers handling and board-level transients. However, RF input and output traces must remain short and shielded; gate bias lines require local 0.001 µF ceramic decoupling within 5 mm of the G pin to suppress RF-induced gate oscillation and transient coupling.