NXP Semiconductors MRF101AN-27MHZ

Overview

MRF101AN-27MHZ from NXP Semiconductors is a 27 MHz reference circuit board designed to evaluate the MRF101AN RF power LDMOS transistor in high-efficiency, high-ruggedness HF/VHF amplifier applications. It delivers 125 W CW output at 50 Vdc supply, 24.9 dB power gain, and 79.6% drain efficiency under specified test conditions, targeting industrial plasma etching and broadcast transmitter final stages.

For engineers reviewing the MRF101AN-27MHZ datasheet, MRF101AN-27MHZ pinout, MRF101AN-27MHZ application, or MRF101AN-27MHZ equivalent, this reference design provides verified impedance matching networks (Z_source = 28.9 + j14.7 Ω, Z_load = 12.9 – j5.3 Ω), thermal management layout, and component BOM for rapid prototyping of 27 MHz RF power amplifiers.

Technical Context

The MRF101AN-27MHZ implements a compact 0.7″ × 2.0″ FR4 PCB layout optimized for single-ended Class AB operation of the MRF101AN transistor at 27 MHz. It integrates input/output matching networks using Murata and ATC chip capacitors and Coilcraft/ATC inductors, with gate bias set via external DC feed and source-grounded through the TO-220-3L package tab.

Thermal design centers on direct mounting of the MRF101AN's exposed backside (source terminal) to an external heatsink, leveraging its 1.1 °C/W junction-to-case thermal resistance. The circuit operates at 100 mA quiescent drain current and supports CW signal excitation only - no pulse or broadband modulation capability is implemented in this variant.

Key Specifications

Availability

MRF101AN-27MHZ is available at Aetrix Electronics and suitable for industrial plasma generators, HF broadcast transmitters, and medical MRI RF subsystems requiring stable component supply and proven reference design validation.

Supply support for MRF101AN-27MHZ 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

NXP Semiconductors is a global semiconductor leader specializing in secure connectivity solutions for automotive, industrial, and communications markets, with deep expertise in RF power device design and ruggedized packaging.

The MRF101AN-27MHZ belongs to NXP's RF Power LDMOS Transistor Reference Circuit family, engineered to accelerate development of high-efficiency, high-reliability HF/VHF amplifiers for industrial heating, broadcast, and scientific instrumentation.

FAQ

What is the primary function of the MRF101AN-27MHZ?

The MRF101AN-27MHZ is a dedicated 27 MHz reference circuit board that implements a complete, validated amplifier stage for the MRF101AN RF power transistor. It provides matched input/output networks, thermal interface design, and a tested BOM to enable rapid evaluation and integration into industrial and broadcast systems operating at exactly 27 MHz.

Can the MRF101AN-27MHZ be used at frequencies other than 27 MHz?

No - the MRF101AN-27MHZ is specifically tuned for 27 MHz operation. Its matching networks, component values (e.g., 160 pF C4/C5, 270 nH L1), and layout are optimized for that single frequency. Performance degrades sharply outside ±0.5 MHz; it is not a broadband or tunable solution.

Does the MRF101AN-27MHZ include the MRF101AN transistor?

Yes - the MRF101AN-27MHZ board includes one mounted MRF101AN RF power LDMOS transistor in TO-220-3L package (pin 1: gate, pin 2: source, pin 3: drain), with the exposed backside electrically connected to the source and thermally coupled to the PCB ground plane for heatsink mounting.

What thermal requirements apply when using the MRF101AN-27MHZ?

The MRF101AN-27MHZ requires mechanical attachment of the transistor's exposed backside (source terminal) to an external heatsink. To maintain safe junction temperature (<175°C), the heatsink must provide ≤0.5 °C/W thermal resistance to ambient, given the board's 125 W CW dissipation and the MRF101AN's 1.1 °C/W R_θJC.

Is the MRF101AN-27MHZ compatible with the MRF101BN transistor?

No - the MRF101AN-27MHZ is designed exclusively for the MRF101AN (gate-source-drain pinout). The MRF101BN uses a mirror pinout (drain-source-gate), making it incompatible without PCB redesign. Using MRF101BN would reverse DC biasing and cause immediate failure.