NXP Semiconductors MRF300AN-50MHZ

Overview

MRF300AN-50MHZ from NXP Semiconductors is a 50 MHz reference circuit board designed to evaluate the MRF300AN RF power LDMOS transistor in continuous-wave (CW) operation at 50 Vdc, delivering 320 W output power with 27.3 dB power gain and 73.0% drain efficiency. It serves as a validated design platform for industrial plasma, MRI excitation, and broadcast amplifier stages.

For engineers reviewing the MRF300AN-50MHZ datasheet, MRF300AN-50MHZ pinout, MRF300AN-50MHZ application, or MRF300AN-50MHZ equivalent, this reference circuit provides verified impedance matching networks, thermal layout guidance, and component-level bill-of-materials for rapid prototyping of HF/VHF RF power amplifiers operating up to 250 MHz.

Technical Context

The MRF300AN-50MHZ implements a common-source amplifier topology using the MRF300AN transistor in Class AB bias (IDQ = 100 mA), with input/output matching networks optimized for 50 Ω systems. It operates at VDD = 50 Vdc and supports CW signal types only - not pulsed or modulated waveforms per its reference circuit specification.

Impedance transformation is achieved via discrete air-core and chip inductors (L1–L5) and high-Q ATC/Murata capacitors, targeting a source impedance of 6.44 + j12.27 Ω and load impedance of 5.05 + j1.36 Ω at 50 MHz. The PCB uses 2 oz copper on FR4 with εr = 4.8 and 0.087″ thickness for controlled thermal and RF performance.

Key Specifications

Availability

MRF300AN-50MHZ is available at Aetrix Electronics and suitable for industrial plasma etching, medical MRI excitation, and HF broadcast transmitter development requiring stable component supply and proven reference designs.

Supply support for MRF300AN-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 company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and communication applications.

The MRF300AN-50MHZ belongs to NXP's RF Power Transistor Reference Circuit family, engineered to accelerate adoption of the MRF300AN LDMOS device in rugged, high-efficiency HF/VHF amplifier designs for industrial and broadcast infrastructure.

FAQ

What is the MRF300AN-50MHZ used for?

The MRF300AN-50MHZ is a 50 MHz reference circuit board that demonstrates the MRF300AN RF power LDMOS transistor in a fully assembled, tested amplifier configuration. It delivers 320 W CW output at 50 Vdc and is intended for evaluation, prototyping, and design validation in industrial heating, MRI systems, and broadcast transmitters - not for direct end-product integration without further qualification.

Does the MRF300AN-50MHZ include the MRF300AN transistor?

Yes, the MRF300AN-50MHZ includes one MRF300AN RF power LDMOS transistor mounted on the PCB. The transistor is soldered in place and forms the active core of the reference amplifier, with all supporting biasing, matching, and decoupling components populated per Table 16 of the official NXP documentation.

Can the MRF300AN-50MHZ operate at frequencies other than 50 MHz?

No - the MRF300AN-50MHZ is specifically tuned for 50 MHz CW operation. Its input/output matching network, component values, and layout are optimized for that frequency. Operation at other frequencies (e.g., 27 MHz or 144 MHz) requires a different reference circuit such as MRF300AN-27MHZ or MRF300AN-144MHZ, as confirmed by NXP's documented reference circuit series.

What is the recommended gate bias voltage for the MRF300AN on the MRF300AN-50MHZ board?

The MRF300AN-50MHZ is configured for IDQ = 100 mA quiescent drain current, which corresponds to a typical gate-source voltage (VGS(Q)) of 2.5 Vdc per NXP's electrical characteristics table. This is set via the onboard trimming potentiometer R8 (5.0 kΩ multi-turn cermet), allowing fine adjustment during evaluation.

Is thermal management provided on the MRF300AN-50MHZ board?

Yes - the MRF300AN-50MHZ features a TO-247-3L footprint with exposed backside (source terminal) designed for direct mounting to an external heatsink. The PCB layout includes generous copper pour around the transistor pad and thermal vias, consistent with NXP's thermal design guidelines for 300 W CW operation at case temperatures up to +150°C.