Infineon Technologies PTFA260451E V1

Overview

PTFA260451E from Infineon Technologies is a thermally-enhanced, internally matched 45 W RF LDMOS FET designed for CDMA2000, Super3G, and WiMAX base station power amplifiers operating at 2.62–2.68 GHz. It delivers 10 W average output power with 14 dB gain and –52 dBc ACPR under three-carrier CDMA2000 conditions (28 V, 500 mA, 2680 MHz), and supports 10:1 VSWR tolerance at 45 W CW output.

For engineers reviewing the PTFA260451E datasheet, PTFA260451E pinout, PTFA260451E application, or PTFA260451E equivalent, key selection criteria include drain efficiency (37% typ. @ 45 W PEP), thermal resistance (0.88 °C/W), gate bias stability across temperature, broadband impedance matching (Z_IN ≈ 19 Ω, Z_OUT ≈ 7 Ω at 2680 MHz), and ESD robustness (HBM Class 2).

Technical Context

This LDMOS transistor employs gold-metallized source/drain interconnects and a thermally enhanced H-30265-2 slotted flange package to maximize junction-to-case heat transfer. Its internal matching network enables operation across the full 2.62–2.68 GHz band without external tuning components in typical base station PA stages.

The device operates with fixed 28 V drain supply and gate bias of 2.5 V (typ.) at 500 mA quiescent current. It exhibits low HCI drift and stable gain (±0.3 dB) over case temperature (–20°C to +85°C), supporting high-linearity multi-carrier modulation schemes including 64-QAM WiMAX and CDMA2000.

Key Specifications

Pinout & Package

Package: H-30265-2 - thermally enhanced slotted flange, single-ended, metal-ceramic hybrid with solderable flange and isolated gate terminal.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MRFE6VP6450HR5 and QPD1025, the PTFA260451E offers superior broadband flatness and built-in ESD robustness-critical for multi-standard base stations where layout simplicity and field reliability outweigh marginal efficiency gains.

Availability

PTFA260451E is available at Aetrix Electronics and suitable for CDMA2000 base station power amplifiers, WiMAX outdoor units, Super3G Node B designs, and LTE Band 7 repeaters requiring stable component supply and long-term lifecycle support.

Supply support for PTFA260451E 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 RF LDMOS and GaN technologies for wireless infrastructure.

The PTFA series targets high-reliability, thermally demanding RF power applications in cellular base stations, emphasizing ruggedness, gold metallization, and simplified matching for 2–3.5 GHz bands.

FAQ

What is the recommended gate bias voltage and how does it vary with temperature?

The PTFA260451E specifies a typical gate voltage of 2.5 V at 25°C and 500 mA IDQ. Bias voltage decreases by ~0.5% per 10°C rise in case temperature, remaining within 2.0–3.0 V across –20°C to +85°C. This stability is achieved through integrated gate bias compensation, eliminating need for external thermistors or active regulation circuits.

Can this device be used in Class AB or Class C amplifier configurations?

Yes-the PTFA260451E is characterized and qualified for Class AB operation (IDQ = 500 mA) in CDMA2000 and WiMAX applications. While it can operate in Class C, its internal matching and thermal design are optimized for linear Class AB use; Class C operation would require re-characterization of gain compression and efficiency curves.

What is the maximum safe operating drain voltage and why is it limited to 65 V?

The absolute maximum drain-source voltage is 65 V, defined by the LDMOS epitaxial layer breakdown voltage and gate oxide integrity limits. Exceeding this risks irreversible avalanche failure or gate oxide punch-through, especially under transient VSWR conditions-even if average power remains within ratings.

How does the internal matching affect PCB layout compared to unmatched RF transistors?

The internal matching reduces required external components: no input/output LC networks are needed for 2.62–2.68 GHz operation. Layout must still maintain tight control over gate trace inductance (<0.3 nH) and drain flange thermal resistance (<0.2 °C/W interface), per datasheet reference circuit guidelines-especially for the 0.88 °C/W R_θJC to be realized.