NXP Semiconductors MRF300AN-144MHZ

Overview

MRF300AN-144MHZ from NXP Semiconductors is a 144 MHz reference circuit board built around the MRF300AN 300 W RF power LDMOS transistor, operating at 50 Vdc with 320 W CW output, 23.0 dB power gain, and 73.0% drain efficiency. It serves as a validated design platform for HF/VHF broadcast, industrial plasma, and MRI amplifier stages.

For engineers reviewing the MRF300AN-144MHZ datasheet, MRF300AN-144MHZ application, or MRF300AN-144MHZ equivalent, this reference circuit provides verified impedance matching (Z_source = 1.62 + j6.44 Ω, Z_load = 4.32 + j2.06 Ω), component-level BOM, layout, and thermal performance data essential for rapid RF PA development.

Technical Context

This reference circuit implements a common-source Class AB RF power amplifier using the MRF300AN in a TO-247-3L package, optimized for 144 MHz continuous-wave operation. It features a discrete LC input/output matching network, gate biasing via trimmer potentiometer (R4), and DC blocking/RF bypassing with ATC/Murata high-Q capacitors and Coilcraft air-core inductors.

The design delivers stable 320 W CW output under 50 Vdc supply and 100 mA quiescent drain current, with measured input return loss >20 dB and ruggedness validated to >65:1 VSWR at 230 MHz - confirming robust load mismatch tolerance applicable across the 1.8–250 MHz band.

Key Specifications

Availability

MRF300AN-144MHZ is available at Aetrix Electronics and suitable for VHF broadcast transmitters, industrial plasma generators, MRI RF power systems, and aerospace communications requiring stable component supply and proven reference designs.

Supply support for MRF300AN-144MHZ 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 communication markets, with deep expertise in RF power technologies.

The MRF300AN-144MHZ belongs to NXP's wideband RF power LDMOS reference circuit family, designed to accelerate deployment of rugged, high-efficiency amplifiers for ISM, broadcast, and scientific applications from 13.56 MHz to 230 MHz.

FAQ

What is the MRF300AN-144MHZ and how does it differ from the MRF300AN transistor?

The MRF300AN-144MHZ is a fully assembled 144 MHz reference circuit board - not a semiconductor device - built around the MRF300AN RF power transistor. Unlike the bare MRF300AN die-in-package, the MRF300AN-144MHZ includes all matching components, bias network, PCB layout, and thermal interface, delivering verified 320 W CW performance at 144 MHz out-of-the-box.

Does the MRF300AN-144MHZ include the MRF300AN transistor?

Yes, the MRF300AN-144MHZ reference circuit board integrates one MRF300AN RF power LDMOS transistor in a TO-247-3L package, mounted with thermal compound on a copper-clad FR4 PCB. The transistor is soldered in place and forms the active core of the amplifier stage.

What are the key impedance values provided for the MRF300AN-144MHZ reference circuit?

The MRF300AN-144MHZ reference circuit specifies series-equivalent source impedance Z_source = 1.62 + j6.44 Ω and load impedance Z_load = 4.32 + j2.06 Ω at 144 MHz, measured from gate-to-ground and drain-to-ground respectively - critical for designing interstage matching networks or integrating into larger transmitter chains.

Can the MRF300AN-144MHZ be used at frequencies other than 144 MHz?

The MRF300AN-144MHZ is optimized and characterized specifically for 144 MHz CW operation. While the underlying MRF300AN transistor supports 1.8–250 MHz, performance (Pout, Gps, η_D) degrades outside the tuned band; NXP provides separate reference circuits for 13.56 MHz, 27 MHz, 40.68 MHz, 50 MHz, 81.36 MHz, and 230 MHz to maintain full specification compliance.

What thermal management provisions are included in the MRF300AN-144MHZ design?

The MRF300AN-144MHZ uses a 2 oz. copper FR4 PCB with exposed backside (serving as source terminal) for direct heatsink mounting. Its thermal design targets case temperature ≤76°C at 300 W CW, leveraging the MRF300AN's 0.55 °C/W junction-to-case thermal resistance - requiring an external heatsink rated for ≥200 W dissipation with forced-air or liquid cooling.