NXP Semiconductors MRF13750H-915MHZ

Overview

MRF13750H-915MHZ from NXP Semiconductors is a 750 W CW, 50 V N-channel enhancement-mode LDMOS RF power transistor optimized for industrial heating and welding systems at 915 MHz. It delivers 750 W output power with 19.3 dB power gain and 67.1% drain efficiency in narrowband CW operation, and supports pulse mode up to 850 W peak under 10% duty cycle. Its internally input pre-matched design simplifies integration into high-power ISM amplifiers.

For engineers reviewing the MRF13750H-915MHZ datasheet, MRF13750H-915MHZ pinout, MRF13750H-915MHZ application, or MRF13750H-915MHZ equivalent, key selection criteria include ruggedness under >10:1 VSWR load mismatch, thermal resistance of 0.15 °C/W (CW), ESD protection rated to 2500 V HBM, and compatibility with 50 V DC supply and 150–200 mA quiescent current biasing.

Technical Context

The MRF13750H-915MHZ is a dual-gate, dual-drain lateral MOSFET with source connected to package backside. It operates in Class AB or Class C configurations and is characterized for 30–50 V drain supply, supporting both single-ended and push-pull topologies. Its internal input matching eliminates external gate matching networks in 915 MHz reference circuits.

Thermal performance is defined by junction-to-case resistance of 0.15 °C/W under 700 W CW at TC = 82 °C, and junction-to-case thermal impedance of 0.014 °C/W under pulsed conditions (850 W peak, 100 µs, 10% duty). Ruggedness testing confirms no degradation at 50 V with 3 dB overdrive into >10:1 VSWR at all phase angles.

Key Specifications

Pinout & Package

Package: NI-1230H-4S, ceramic/metal air-cavity package with electrically isolated flange and source-connected backside. Dimensions per Figure 1: 32.5 mm × 22.2 mm × 4.2 mm (L × W × H).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MRFE6VP61K25H and CGHV14800F, the MRF13750H-915MHZ offers optimal balance of proven 915 MHz narrowband performance, ruggedness, integrated ESD, and long-term supply assurance - making it the preferred choice for industrial heating and welding where reliability and support lifecycle outweigh marginal efficiency gains.

Availability

MRF13750H-915MHZ is available at Aetrix Electronics and suitable for industrial heating systems, RF welding equipment, and plasma generators requiring stable component supply across multi-year production cycles.

Supply support for MRF13750H-915MHZ 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 leader in high-performance RF power solutions, with deep expertise in LDMOS technology for industrial, scientific, and medical applications.

The MRF13750H-915MHZ belongs to NXP's industrial RF power transistor family, engineered specifically for high-reliability, high-efficiency solid-state replacement of vacuum tubes in 700–1300 MHz ISM systems.

FAQ

What is the maximum continuous drain current rating for the MRF13750H-915MHZ?

The MRF13750H-915MHZ does not specify a maximum continuous drain current (ID) rating. Instead, its safe operating area is defined by total device dissipation (1333 W at TC = 25 °C, derated 6.67 W/°C above), junction temperature limit (–40 to +225 °C), and case temperature range (–40 to +150 °C). Actual ID depends on bias point, VDD, and thermal management - typical quiescent current is 150–200 mA per side under 50 V operation. The MRF13750H-915MHZ must be operated within its SOA curves shown in the datasheet.

Can the MRF13750H-915MHZ be used in Class D or E switching amplifier topologies?

No - the MRF13750H-915MHZ is characterized and optimized for Class AB and Class C linear RF amplification, not hard-switching topologies. Its LDMOS structure, gate charge characteristics, and thermal design target narrowband CW and pulsed operation with analog bias control. Class D/E operation would exceed safe operating limits for dv/dt, di/dt, and junction temperature transients. For switching applications, discrete GaN or SiC devices with specified switching parameters should be selected instead of the MRF13750H-915MHZ.

What is the recommended gate bias sequence during power-up for the MRF13750H-915MHZ?

The MRF13750H-915MHZ requires controlled gate bias sequencing: first apply VGS(Q) ≈ 1.7–2.7 V (typical 2.2 V) while VDD = 0 V, then ramp VDD to 50 V. Reverse sequencing (applying VDD before gate bias) risks uncontrolled turn-on and catastrophic failure. The recommended driver MRFE6VS25GN includes built-in bias sequencing. For discrete bias networks, use active gate controllers with delay timers or dedicated RF power transistor bias ICs. This sequencing is mandatory for reliable operation of the MRF13750H-915MHZ.

Does the MRF13750H-915MHZ require external input matching at 915 MHz?

No - the MRF13750H-915MHZ is internally input pre-matched for 915 MHz narrowband operation, as confirmed in the datasheet's "Features" and verified in the 915 MHz reference circuit (Table 7, Figure 5). External gate matching is unnecessary in standard 50 Ω systems. However, output matching remains required, and the device's series-equivalent source impedance (0.58 + j0.24 Ω at 915 MHz) informs input network design only if deviating from the reference layout. The MRF13750H-915MHZ simplifies design by eliminating gate matching components.

Is the MRF13750H-915MHZ pin-compatible with the MRF13750HS variant?

Yes - the MRF13750H-915MHZ and MRF13750HS share identical pinout, package outline (NI-1230H-4S vs. NI-1230S-4S), and electrical specifications; the HS variant differs only in tape-and-reel packaging (R5 suffix) and screening for enhanced reliability in high-stress environments. Both use the same 4-pin configuration (Drain A, Gate A, Gate B, Drain B) and backside source connection. No PCB changes are required when substituting MRF13750HS for MRF13750H-915MHZ in existing designs.