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1.5kW RF transistor from NXP operates up to 500MHz

Posted: 18 Apr 2016 ?? ?Print Version ?Bookmark and Share

Keywords:NXP Semiconductors? RF transistor? amplifier? welding machine?

NXP Semiconductors has unveiled what it boasts as the most powerful RF transistor in any technology operating at any frequency that combines remarkable RF output power with superior ruggedness and thermal performance. Geared to deliver 1.5kW CW at 50V, the MRF1K50H can slash the number of transistors in high-power RF amplifiers, which decreases amplifier size and BOM.

The MRF1K50H operates up to 500MHz for a range of applications from laser and plasma sources to particle accelerators, industrial welding machines, radio and VHF TV broadcast transmitters, and amateur radio linear amplifiers.

Like all rugged LDMOS transistors, the MRF1K50H is expected to survive a VSWR of 65:1 but can absorb 50 per cent more energy than its predecessor, the 1.25kW MRFE6VP61K25H. This level of ruggedness increases reliability, which makes the transistor an excellent alternative to vacuum tubes.


The MRF1K50H is housed in a standard air cavity ceramic package, and is impedance compatible with existing high-power transistors on the market today: it can simply be dropped into existing systems, without the need to redesign the PCB, requiring only light retuning.

Even greater reliability can be achieved with the over-moulded plastic version of the transistor, the MRF1K50N, which reduces the thermal resistance by 30 per cent compared to the MRF1K50H. NXP's plastic packaging technology helps extract more performance from RF transistors, while simplifying amplifier manufacturability thanks to tighter dimensional tolerances and better solder connections.

Specifications for both versions include efficiency of 80 per cent at 100MHz, gain of 23.5dB, and minimum breakdown voltage of 135V. Once in production, the transistors will be part of NXP's product longevity programme, ensuring availability for at least 15 years.

The MRF1K50H and MRF1K50N are sampling, and production is expected in July 2016. Reference circuits for various frequencies are available.

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