NXP Semiconductors MRF1K50H-88MHZ

Overview

MRF1K50H-88MHZ from NXP Semiconductors is a high-ruggedness, 1500 W CW, 50 V RF power LDMOS transistor optimized for broadband industrial, broadcast, and aerospace applications in the 1.8–500 MHz range. It delivers 1475 W output at 87.5–108 MHz with 23.3 dB power gain and 83.4% drain efficiency under CW conditions, and supports pulse operation up to 1500 W peak at 230 MHz. Its dual-gate/dual-drain structure enables push-pull or single-ended configurations in VHF TV broadcast transmitters.

For engineers reviewing the MRF1K50H-88MHZ datasheet, MRF1K50H-88MHZ pinout, MRF1K50H-88MHZ application, or MRF1K50H-88MHZ equivalent, this device is selected for high-VSWR resilience (>65:1 at 230 MHz), avalanche energy tolerance, and thermal robustness (R_θJC = 0.10 °C/W) in demanding RF power amplifier stages requiring stable 50 V operation and wideband impedance matching.

Technical Context

The MRF1K50H-88MHZ is a laterally diffused MOSFET with high-energy avalanche capability and integrated ESD protection (HBM Class 2, MM Class B). Its unmatched input/output design eliminates external tuning networks across 1.8–500 MHz, supporting both narrowband (e.g., 81.36 MHz, 230 MHz) and broadband (87.5–108 MHz) reference circuits.

It operates in enhancement-mode with gate threshold voltage of 1.7–2.7 Vdc and exhibits low on-resistance (V_DS(on) = 0.15 Vdc at V_GS = 10 Vdc, I_D = 2.4 A), high transconductance (g_fs = 33.5 S), and low capacitances (C_iss = 664 pF, C_oss = 205 pF, C_rss = 3.48 pF) - enabling efficient broadband amplification with minimal harmonic distortion.

Key Specifications

Pinout & Package

Package: NI-1230H-4S - ceramic/metal air-cavity package with source-connected backside, rated for 1500 W CW operation and optimized for forced-air or liquid-cooled heatsink mounting.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MRF1K50N, the MRF1K50H-88MHZ trades 0.02 °C/W higher thermal resistance for broader legacy compatibility and lower cost; versus MRFE6VP61K25H, it offers superior ruggedness below 500 MHz and seamless integration into existing 50 V LDMOS infrastructure without gate-drive redesign.

Availability

MRF1K50H-88MHZ is available at Aetrix Electronics and suitable for FM radio broadcast transmitters, VHF TV amplifiers, industrial plasma generators, and aerospace VOR beacons requiring stable component supply over extended production lifecycles.

Supply support for MRF1K50H-88MHZ 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, specializing in LDMOS and GaN technologies for mission-critical wireless infrastructure and industrial systems.

The MRF1K50H-88MHZ belongs to NXP's high-ruggedness RF power LDMOS family, engineered specifically for industrial heating, broadcast transmission, and aerospace communications where reliability under extreme VSWR and thermal stress is non-negotiable.

FAQ

What is the maximum continuous drain current rating for the MRF1K50H-88MHZ?

The MRF1K50H-88MHZ does not specify a maximum continuous drain current (I_D) as a standalone parameter. Instead, its safe operating area is defined by maximum drain-source voltage (V_DSS = +135 Vdc), total device dissipation (P_D = 1667 W @ T_C = 25°C), and junction temperature limit (T_J = +225°C). In practice, quiescent drain current per side is characterized at 100–200 mA for typical broadband operation, with peak pulsed current reaching ~36 A under 1500 W output conditions.

Does the MRF1K50H-88MHZ require external gate protection diodes?

No, the MRF1K50H-88MHZ integrates ESD protection meeting HBM Class 2 (2500 V), MM Class B (250 V), and CDM Class IV (2000 V) standards. Its gate-source voltage rating of –6.0 to +10 Vdc and built-in negative gate tolerance support robust Class C operation without external clamping diodes - provided gate drive remains within these limits and layout avoids parasitic ringing.

Can the MRF1K50H-88MHZ be operated at 50 V with a 10% duty cycle pulse waveform?

Yes, the MRF1K50H-88MHZ is fully characterized for pulsed operation at 50 Vdc, including 100 µsec pulse width and 20% duty cycle at 230 MHz, delivering 1500 W peak output. At 10% duty cycle, thermal constraints relax further, allowing sustained peak power operation - though gate bias and matching network must be re-optimized per pulse fidelity and spectral purity requirements.

What is the recommended heatsink mounting torque for the MRF1K50H-88MHZ NI-1230H-4S package?

NXP specifies a mounting torque of 20–25 in·lb (2.26–2.83 N·m) for the four M3 screws securing the NI-1230H-4S package to the heatsink. Uniform torque application is critical to ensure consistent thermal contact across the entire baseplate; deviation risks localized hot spots and premature failure. Thermal interface material (e.g., silver-filled grease or phase-change pad) must be applied per AN1908 guidelines.

Is the MRF1K50H-88MHZ pin-compatible with earlier MRF1K50 variants like MRF1K50HR5?

Yes, the MRF1K50H-88MHZ shares identical NI-1230H-4S mechanical footprint, pinout, and terminal assignments with all MRF1K50H variants including MRF1K50HR5. The "-88MHZ" suffix denotes characterization and optimization focus at 88 MHz (within the 87.5–108 MHz broadband band), but electrical and mechanical compatibility is maintained across the MRF1K50H family for drop-in replacement in existing designs.