NXP Semiconductors MRF101AN-50MHZ

Overview

MRF101AN-50MHZ from NXP Semiconductors is a 50 MHz reference circuit board designed to evaluate the MRF101AN RF power LDMOS transistor in continuous-wave (CW) HF/VHF amplifier applications. It delivers 119 W output power at 22.8 dB power gain and 82.1% drain efficiency under 50 Vdc bias, with validated impedance matching (Z_source = 19.2 + j12.8 Ω, Z_load = 15.8 – j3.2 Ω) for industrial plasma etching systems.

For engineers reviewing the MRF101AN-50MHZ datasheet, MRF101AN-50MHZ pinout, MRF101AN-50MHZ application, or MRF101AN-50MHZ equivalent, this reference design provides verified component values, layout, thermal management guidance, and performance validation data for rapid prototyping of 50 MHz RF power amplifiers in ISM and broadcast transmitters.

Technical Context

This compact 0.7″ × 2.0″ (1.8 cm × 5.0 cm) FR4 PCB implements a single-ended common-source amplifier using the MRF101AN in TO-220-3L package. It operates at 50 Vdc with 100 mA quiescent drain current and supports 0.64 W input drive, delivering linear CW output up to 119 W across the 50 MHz band.

The circuit employs discrete passive matching networks-using ATC and Coilcraft inductors (L1–L4), Murata and AVX capacitors (C1–C13), and a Fair-Rite RF bead (B1)-to transform 50 Ω source/load impedances to the device's optimal Z_source and Z_load, enabling stable high-efficiency operation without external feedback or stabilization components.

Key Specifications

Availability

MRF101AN-50MHZ is available at Aetrix Electronics and suitable for industrial plasma etching, MRI RF power generation, HF broadcast transmitters, and VHF communications infrastructure requiring stable component supply and validated reference designs.

Supply support for MRF101AN-50MHZ 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 IoT applications, with deep expertise in RF power technology.

The MRF101AN-50MHZ belongs to NXP's RF Power LDMOS Transistor Reference Circuit family, engineered to accelerate development of rugged, high-efficiency HF/VHF amplifiers for industrial heating, medical imaging, and broadcast systems.

FAQ

What is the primary function of the MRF101AN-50MHZ reference circuit?

The MRF101AN-50MHZ reference circuit is a fully assembled and characterized evaluation board that demonstrates optimal 50 MHz operation of the MRF101AN RF power LDMOS transistor. It provides validated component values, layout, thermal design, and measured performance data-including 119 W CW output, 22.8 dB gain, and 82.1% efficiency-to enable rapid prototyping of industrial and broadcast amplifiers without custom RF tuning.

Does the MRF101AN-50MHZ include the MRF101AN transistor?

Yes, the MRF101AN-50MHZ reference circuit includes one MRF101AN RF power LDMOS transistor mounted in a TO-220-3L package (Pin 1: Gate, Pin 2: Source, Pin 3: Drain). The transistor is soldered onto the board and integrated into the complete matching network, allowing immediate functional evaluation under 50 Vdc bias.

Can the MRF101AN-50MHZ be used at frequencies other than 50 MHz?

The MRF101AN-50MHZ is specifically optimized and characterized for 50 MHz operation. While the underlying MRF101AN transistor supports 1.8–250 MHz, performance at other frequencies (e.g., 27 MHz or 81.36 MHz) requires different matching networks-validated in separate reference circuits (MRF101AN-27MHZ, MRF101AN-81MHZ). Using MRF101AN-50MHZ outside its designated band risks degraded gain, efficiency, and stability.

What thermal management provisions does the MRF101AN-50MHZ include?

The MRF101AN-50MHZ features an exposed copper pad beneath the MRF101AN's TO-220-3L package, directly connected to the source terminal and designed for mechanical mounting to an external heatsink. This thermal path-combined with the device's 1.1 °C/W junction-to-case thermal resistance-enables reliable 119 W CW operation when paired with a properly sized heatsink and thermal interface material.

Where can I find the bill of materials and layout files for the MRF101AN-50MHZ?

The complete bill of materials (BOM), including part numbers and manufacturers for all 20+ components (e.g., ATC 0805WL101JT inductor, Murata GRM21BR72A103KA01B capacitor, Fair-Rite 2743019447 RF bead), is published in Table 15 of the official NXP MRF101AN data sheet (Rev. 1, 05/2019). The PCB layout (Figure 22) and assembly drawing (Figure 21) are also included in that document.