NXP Semiconductors MRF300AN

Overview

MRF300AN from NXP Semiconductors is a high-ruggedness, 300 W CW, 50 V RF power LDMOS transistor optimized for 230 MHz pulsed operation in industrial and broadcast amplifiers. It delivers 330 W peak output power at 230 MHz with 20.4 dB power gain and 75.5% drain efficiency under 100 µsec/20% duty cycle conditions, and sustains >65:1 load VSWR without degradation - making it suitable for plasma etching and HF/VHF broadcast transmitters.

For engineers reviewing the MRF300AN datasheet, MRF300AN pinout, MRF300AN application, or MRF300AN equivalent, this page provides verified package mapping (TO-247-3L), validated 230 MHz fixture performance, ruggedness test results, thermal impedance (0.13 °C/W pulse), and direct alternatives for wideband RF amplifier design.

Technical Context

The MRF300AN operates as a common-source RF power amplifier stage with enhancement-mode lateral MOSFET architecture. Its gate threshold voltage (1.7–2.7 V) and low on-resistance (V_DS(on) = 0.16 V) enable stable Class AB or Class C biasing at 50 V supply, while integrated ESD protection supports robust handling in high-power RF environments.

Thermal design is enabled by a low junction-to-case thermal impedance of 0.13 °C/W under pulsed conditions (100 µsec, 20% duty cycle) and a maximum junction temperature rating of +175 °C. The device is characterized across 30–250 MHz and exhibits consistent 330 W peak output capability up to 230 MHz in NXP's validated fixture.

Key Specifications

Pinout & Package

Package: TO-247-3L (lead-free, RoHS-compliant). Exposed backside serves as source terminal. Mounting surface must be electrically connected to source potential for optimal thermal and RF performance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar RF power amplifier applications.

Compared with MRF300BN, the MRF300AN offers gate-leading pinout for single-ended designs and simplified gate drive routing; compared with MRFE6VP6300H, it delivers superior 230 MHz efficiency (75.5% vs. 71%) and lower thermal impedance, making it more cost-effective for fixed-frequency industrial amplifiers.

Availability

MRF300AN is available at Aetrix Electronics and suitable for plasma etching, VHF broadcast transmitters, and industrial RF heating systems requiring stable component supply and long-term lifecycle assurance.

Supply support for MRF300AN 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 focused on secure connectivity solutions for automotive, industrial, and IoT markets.

The MRF300AN belongs to NXP's RF Power LDMOS transistor family, designed specifically for rugged, high-efficiency wideband amplification in industrial, scientific, medical, and broadcast applications from 1.8 MHz to 250 MHz.

FAQ

What is the maximum continuous drain current rating for the MRF300AN?

The MRF300AN does not specify a maximum continuous drain current (I_D) rating directly; instead, its safe operating area is defined by maximum ratings including V_DSS = +133 Vdc, total device dissipation P_D = 272 W @ T_C = 25 °C, and junction temperature limit of +175 °C. Actual current depends on operating voltage, duty cycle, and thermal management - for example, at 50 Vdc and 300 W CW, average I_D ≈ 6 A, but pulsed operation at 230 MHz allows higher peak currents.

Does the MRF300AN require external gate protection diodes?

No, the MRF300AN includes integrated ESD protection rated to HBM Class 2 (2500 V) and CDM Class C3 (1200 V), eliminating the need for external gate protection diodes in standard handling and circuit operation. This integration reduces board space, parasitic capacitance, and risk of RF input mismatch - confirmed in NXP's application notes and reliability testing.

What is the recommended gate bias voltage for linear operation of the MRF300AN?

The MRF300AN's gate quiescent voltage (V_GS(Q)) is specified as 2.5 Vdc typical at V_DD = 50 Vdc and I_DQ = 100 mA. For linear Class AB operation, NXP recommends setting V_GS(Q) between 2.3 V and 2.7 V using a stable, low-noise bias network - as implemented in all reference circuits (e.g., 13.56 MHz, 40.68 MHz, and 230 MHz fixtures) with trimmer potentiometers for precise adjustment.

Can the MRF300AN be used in Class C mode for high-efficiency RF heating?

Yes, the MRF300AN is explicitly characterized for Class C operation, supported by its extended negative gate-source voltage range (–6.0 Vdc) and ruggedness under overdrive conditions. In the 230 MHz fixture, it withstands 3 dB overdrive (6 W peak input) with no degradation at >65:1 VSWR - confirming suitability for non-linear, high-efficiency RF heating applications such as industrial drying and plasma ignition where harmonic content is managed externally.

What thermal interface material is recommended for mounting the MRF300AN in high-power applications?

NXP specifies that the MRF300AN's exposed backside serves as the source terminal and primary thermal path. A thermally conductive, electrically isolating interface material with ≤0.15 °C·in²/W thermal resistance is recommended - such as Bergquist Sil-Pad 400 (0.005" thick) or Parker Chomerics Thermonamic 3000. Mechanical mounting must ensure uniform pressure (35–50 psi) and flatness <0.002" across the TO-247-3L flange to maintain the specified 0.13 °C/W pulsed thermal impedance.