NXP Semiconductors MRF1K50H-TF5

Overview

MRF1K50H-TF5 from NXP Semiconductors is a high-ruggedness, 1500 W CW, 50 V RF power LDMOS transistor designed for broadband operation from 1.8 to 500 MHz in industrial, broadcast, aerospace, and mobile radio amplifiers. It features dual-gate/dual-drain architecture, 78.3% drain efficiency at 27 MHz, 25.9 dB power gain, and >65:1 load VSWR tolerance at 230 MHz under pulsed overdrive.

For engineers reviewing the MRF1K50H-TF5 datasheet, MRF1K50H-TF5 pinout, MRF1K50H-TF5 application, or MRF1K50H-TF5 equivalent, this device is selected for high-reliability RF final-stage amplification where wideband matching, avalanche energy handling, and thermal robustness at TC = 150°C are critical design requirements.

Technical Context

The MRF1K50H-TF5 implements a lateral N-channel enhancement-mode LDMOS structure with integrated ESD protection, characterized across 30–50 V operating voltage and rated for TJ up to +225°C. Its unmatched input/output impedance enables stable broadband operation without external harmonic traps in narrowband (81.36 MHz) and broadband (87.5–108 MHz) reference circuits.

Thermal performance is defined by RθJC = 0.10°C/W (CW, 78°C case), ZθJC = 0.028°C/W (pulse), and ruggedness validated at >65:1 VSWR with no degradation at 50 VDD and 13 W peak input. Gate threshold is 1.7–2.7 Vdc, with quiescent gate voltage of 1.9–2.9 Vdc at IDQ(A+B) = 100 mA.

Key Specifications

Pinout & Package

Package: NI-1230H-4S, ceramic/metal air-cavity package with source-connected backside flange. Dimensions per NXP drawing: 38.1 mm × 38.1 mm × 9.65 mm (1.5″ × 1.5″ × 0.38″), flange-mounted for RF grounding and thermal conduction.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MRF1K50H-TF5, MRF1K50N offers superior thermal performance for identical RF output, while MRFE6VP61K25H trades bandwidth for reduced power and higher-frequency capability-neither is pin-compatible nor drop-in, but both share the same mounting footprint and biasing scheme.

Availability

MRF1K50H-TF5 is available at Aetrix Electronics and suitable for industrial plasma etching, broadcast radio transmitters, and aerospace VOR beacon systems requiring stable component supply over extended production lifecycles.

Supply support for MRF1K50H-TF5 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 high-performance RF, automotive, and secure connectivity solutions, with core expertise in gallium nitride and silicon LDMOS power devices.

The MRF1K50H-TF5 belongs to NXP's high-ruggedness RF power LDMOS family, engineered specifically for mission-critical amplification in ISM, broadcast, and aerospace systems where reliability under extreme VSWR and thermal stress is non-negotiable.

FAQ

What is the maximum continuous drain current rating for the MRF1K50H-TF5?

The MRF1K50H-TF5 does not specify a maximum continuous drain current in its datasheet. Instead, it defines absolute maximum ratings via voltage (VDSS = +135 Vdc), power dissipation (PD = 1667 W @ TC = 25°C), and junction temperature (TJ = +225°C). Actual operating current depends on bias point, frequency, and thermal management-typical IDQ(A+B) ranges from 100 mA to 200 mA in reference circuits, with peak pulsed current exceeding 100 A under 1500 W output conditions. The MRF1K50H-TF5 must be operated within its safe operating area (SOA) curves.

Can the MRF1K50H-TF5 be used in Class C amplifier configurations?

Yes, the MRF1K50H-TF5 supports Class C operation due to its extended negative gate-source voltage range (VGS = –6.0 Vdc) and integrated ESD protection, which improve turn-off robustness during high-efficiency switching. However, its primary characterization and reference circuits target Class AB and linear Class B operation. For Class C use, gate drive must be carefully limited to avoid exceeding VGS(th) hysteresis and ensure stable turn-on/turn-off timing-application notes AN1908 and AN1955 provide layout guidance for such implementations. The MRF1K50H-TF5 is not optimized for digital modulation schemes requiring ultra-fast switching.

What is the recommended gate bias network for the MRF1K50H-TF5 in broadband operation?

The MRF1K50H-TF5 requires a low-inductance, broadband gate bias network with separate DC feed and RF choke paths for each gate (A and B). NXP reference designs use 10 Ω chip resistors (CRCW120610R0JNEA) in series with gate leads and parallel 1000 pF ATC capacitors to RF ground. Bias voltage is applied through ferrite beads or 17.5 nH inductors (B06TJLC) to suppress VHF/UHF oscillation. The MRF1K50H-TF5 gate quiescent voltage is 1.9–2.9 Vdc at IDQ(A+B) = 100 mA, and stability depends critically on minimizing loop inductance below 1 nH per gate path.

Does the MRF1K50H-TF5 require external harmonic filtering in 87.5–108 MHz FM broadcast applications?

No, the MRF1K50H-TF5 achieves –46 dBc 4th-harmonic suppression at 87.5 MHz in NXP's broadband reference circuit without external harmonic filters. This performance stems from its intrinsic device capacitances (Ciss = 664 pF, Crss = 3.48 pF) and balanced push-pull topology, which inherently cancel even-order harmonics. However, regulatory compliance (e.g., FCC Part 73) may still require output low-pass filtering to meet spectral mask limits-NXP's reference design includes discrete LC networks optimized for 87.5–108 MHz, and the MRF1K50H-TF5's unmatched ports simplify integration into such networks.

How does the thermal performance of the MRF1K50H-TF5 compare to the MRF1K50N variant?

The MRF1K50H-TF5 has RθJC = 0.10°C/W (CW) and ZθJC = 0.028°C/W (pulse), while the MRF1K50N improves to RθJC = 0.08°C/W-representing a 20% reduction in steady-state thermal resistance. Both share identical pinout, voltage ratings, and RF performance, but the MRF1K50N's enhanced thermal path allows higher power density in space-constrained heatsinks or elevated ambient temperatures. The MRF1K50H-TF5 remains preferred where legacy qualification or specific ruggedness validation (e.g., >65:1 VSWR at 230 MHz) is mandated, whereas the MRF1K50N targets next-generation thermal-limited designs.