Infineon Technologies PTFA211801E V4

Overview

PTFA211801E from Infineon is a thermally-enhanced, internally matched LDMOS RF power transistor designed for WCDMA base station final-stage amplification. It delivers 45.5 dBm average output power at 2140 MHz with 15.5 dB linear gain, 27.5% drain efficiency, and –36 dBc intermodulation distortion under two-carrier 3GPP signal conditions (V_DD = 28 V, I_DQ = 1.2 A). Its primary system role is high-efficiency, broadband RF power amplification in 2110–2170 MHz infrastructure transmitters.

For engineers reviewing the PTFA211801E datasheet, PTFA211801E pinout, PTFA211801E application, or PTFA211801E equivalent, key selection criteria include its 180 W CW P_–1dB capability at 2170 MHz, 65 V V_(BR)DSS, 0.31 °C/W thermal resistance, 10:1 VSWR ruggedness, and gold-metallized construction for reliability in continuous high-power operation.

Technical Context

This device is a single-ended, enhancement-mode N-channel LDMOS FET optimized for wideband WCDMA linear amplification. Its internal broadband matching covers 2110–2170 MHz without external tuning, and it operates with fixed gate bias (V_GS = 2.0–3.0 V typical at I_DQ = 1.2 A), enabling stable Class AB operation in multi-carrier environments.

The transistor features integrated ESD protection (HBM Class 2), low HCI drift, and robust thermal design via slotted flange package (Outline 30260). Its R_DS(on) of 0.05 Ω and junction temperature rating of 200 °C support high-reliability deployment in outdoor macrocell and distributed antenna systems.

Key Specifications

Pinout & Package

PTFA211801E uses a thermally-enhanced slotted flange package (Infineon Outline 30260), with metal tab serving as drain connection and thermal path to heatsink. The flange is electrically isolated from the drain via ceramic substrate.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MRF6P21190HR5 and PD85018STR, PTFA211801E offers superior thermal robustness (0.31 °C/W vs. 0.45–0.52 °C/W), built-in ESD protection, and optimal balance of efficiency and linearity specifically for 2110–2170 MHz WCDMA-making it preferred for macrocell infrastructure where reliability and thermal margin are paramount.

Availability

PTFA211801E is available at Aetrix Electronics and suitable for macrocell base stations, remote radio heads, distributed antenna systems, and WCDMA repeater units requiring stable component supply and long-lifecycle support.

Supply support for PTFA211801E 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 devices for wireless infrastructure.

The PTFA series belongs to Infineon's GOLDMOS LDMOS product line, engineered specifically for linear, high-efficiency WCDMA and LTE base station amplifiers demanding ruggedness, thermal stability, and long operational life.

FAQ

What is the recommended gate bias voltage for PTFA211801E in WCDMA operation?

The datasheet specifies a typical gate-source voltage of 2.5 V (range 2.0–3.0 V) at I_DQ = 1.2 A and V_DD = 28 V. This bias point ensures optimal linearity and efficiency for two-carrier WCDMA signals. Stable regulation is critical: variation beyond ±0.1 V degrades ACPR by >1.5 dB. A low-noise, current-limited bias supply with RC filtering is mandatory.

Can PTFA211801E be used in LTE applications?

Yes-its 2110–2170 MHz characterization and linear performance (–36 dBc IMD, 27.5% efficiency at 45.5 dBm) meet LTE Band I (2110–2170 MHz) requirements for 20 MHz channel bandwidth and 8 dB PAPR. However, it is not characterized for 256-QAM EVM or 3GPP Release 10+ test models; validation under actual LTE signal conditions is required.

What thermal interface material is recommended for the slotted flange?

Infineon recommends a thermally conductive, electrically insulating pad (e.g., Bergquist Sil-Pad 2000) or grease (e.g., Dow Corning TC-5022) with thermal resistance ≤0.15 °C/W at 50 psi clamping pressure. The flange surface must be flat (≤0.05 mm warp) and cleaned with isopropyl alcohol before mounting to avoid air gaps that increase R_θJA.

Is there a drop-in replacement for PTFA211801E with improved efficiency?

No direct drop-in replacement exists with higher efficiency in the same package and pinout. The PTFA211801F (Outline 31260) offers identical RF specs but uses an earless flange; efficiency remains 27.5%. Newer GaN alternatives (e.g., CGHV1F025D) offer >45% efficiency but require full circuit redesign due to different biasing, matching, and thermal requirements.