NXP Semiconductors MRF101AN-40MHZ

Overview

MRF101AN-40MHZ from NXP Semiconductors is a 40.68 MHz reference circuit board built around the MRF101AN RF power LDMOS transistor, delivering 120 W CW output at 50 Vdc with 23.8 dB power gain and 81.5% drain efficiency in a compact 0.7″×2.0″ FR4 layout for industrial plasma etching systems.

For engineers reviewing the MRF101AN-40MHZ datasheet, MRF101AN-40MHZ pinout, MRF101AN-40MHZ application, or MRF101AN-40MHZ equivalent, this reference design provides validated impedance matching (Z_source = 24.0 + j12.6 Ω, Z_load = 14.2 – j2.5 Ω), thermal management for 150°C case operation, and ruggedness testing at >65:1 VSWR under 3 dB overdrive at 40.68 MHz.

Technical Context

This board implements a single-ended, common-source Class AB amplifier topology optimized for continuous-wave operation at 40.68 MHz, using discrete surface-mount passive components including ATC and Coilcraft inductors and Murata capacitors to achieve broadband input/output matching across the ISM band.

The circuit operates at V_DD = 50 Vdc with I_DQ = 100 mA quiescent current, supports 0.5 W input drive, and integrates ESD-protected gate biasing via a 75 Ω chip resistor and short RF bead (Fair-Rite 2743019447) for transient suppression on the gate path.

Key Specifications

Availability

MRF101AN-40MHZ is available at Aetrix Electronics and suitable for industrial plasma etching, medical MRI subsystems, and broadcast auxiliary transmitters requiring stable component supply and pre-validated RF performance at 40.68 MHz.

Supply support for MRF101AN-40MHZ 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 high-performance RF power solutions for industrial, medical, and broadcast applications, with deep expertise in LDMOS technology and reliability engineering.

The MRF101AN-40MHZ belongs to NXP's wideband RF power transistor reference circuit family, designed to accelerate development of robust, high-efficiency amplifiers for ISM-band applications up to 250 MHz.

FAQ

What is the primary function of the MRF101AN-40MHZ reference circuit?

The MRF101AN-40MHZ reference circuit is a fully assembled, tested 40.68 MHz RF power amplifier board centered on the MRF101AN LDMOS transistor. It delivers 120 W CW output with 23.8 dB gain and 81.5% efficiency, intended for rapid prototyping and production validation in industrial plasma and medical RF systems. The board includes all matching components, bias network, and thermal interface design per NXP's published layout.

Does the MRF101AN-40MHZ include the MRF101AN transistor?

Yes, the MRF101AN-40MHZ reference circuit includes one MRF101AN RF power LDMOS transistor mounted on the board. It uses the TO-220-3L package with mirror pinout (Pin 1: Gate, Pin 2: Source, Pin 3: Drain), and the device is soldered and tested as part of the complete assembly per NXP's reference design documentation.

Can the MRF101AN-40MHZ be used at frequencies other than 40.68 MHz?

The MRF101AN-40MHZ is specifically tuned and characterized for optimal performance at 40.68 MHz. While the underlying MRF101AN transistor operates from 1.8–250 MHz, the board's matching network (including 150 nH and 110 nH air-core inductors, 82 pF/200 pF capacitors) is fixed for 40.68 MHz. Operation outside ±1 MHz requires redesign of L/C values and revalidation of Z_source/Z_load per NXP AN1955 guidelines.

What thermal performance can be expected from the MRF101AN-40MHZ board?

The MRF101AN-40MHZ board supports case temperatures up to +150°C and junction temperatures to +175°C. With its 2 oz. copper FR4 construction and exposed source tab (backside thermal pad), it achieves R_θJC = 1.1 °C/W under CW conditions. For sustained 120 W output, a heatsink maintaining T_C ≤ 77°C is required to ensure MTTF > 1 million hours per NXP's reliability calculator.

Is the MRF101AN-40MHZ RoHS-compliant and qualified for industrial use?

Yes, the MRF101AN-40MHZ reference circuit uses only RoHS-compliant components (Murata, ATC, Coilcraft, KOA Speer, Fair-Rite) and conforms to NXP's industrial qualification standards. It is rated for –40°C to +150°C case operating temperature and included in NXP's product longevity program with assured supply for ≥15 years post-launch.