Friday, July 19, 2024

Rad-Hard MOSFETs For Improved Performance Of Space Power Systems

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  • IR HiRel presents new QPL-qualified radiation-hardened MOSFETs for satellite bus power distribution systems and payload power supplies 
  • Has the ability to maintain system reliability by offering a direct thermal path for heat transfer

Attaching surface mount hermetic power packages to PCBs in an effective manner is a common challenge faced by space system designers. Very often, different thermal coefficients lead to an expansion mismatch of different materials. IR HiRel, an Infineon Technologies company, aims to solve this issue with fourteen new QPL-qualified radiation-hardened (rad-hard) MOSFETs housed in an innovative direct-to-PCB mounting package. The SupIR-SMD enables higher performance for space power systems such as satellite bus power distribution systems, payload power supplies, space-grade DC-DC converters and other high-switching designs.

With a capability of attaching directly to the PCB, the SupIR-SMD design has been optimised for surface mount attachments and meets stringent reliability testing in this configuration. The SupIR-SMD delivers a 37 per cent smaller footprint, 34 per cent lighter mass and 33 per cent higher current density while offering a more direct thermal path for heat transfer as compared to typical packaging solution used in space applications.

Better heat dissipation

Traditionally, designers resort to a ‘dead bug’ and lead configuration, where the packages are flipped upside down and soldered to the PCB via leads. Dead bug soldering dissipates heat sub-optimally and decreases MOSFET power capacity. Now, system designers can get improved power system efficiency by directly mounting the SupIR-SMD package to the PCB, thus enabling the shortest thermal conduction path without any compromise in system reliability.

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The SupIR-SMD package is JANS-qualified to MIL-PRF-19500. JANS is the most rigorous level of screening and acceptance requirements available to assure the performance, quality and reliability of discrete semiconductors intended for space flight. The new rad hard MOSFETs are also QPL-qualified under the Qualified Products List (QPL) for space applications.

The new SupIR-SMD QPL-qualified rad hard MOSFETs are available now with the MIL-PRF-19500 package identifier ‘U2A.’

“With this, the SupIR-SMD package is testament to IR HiRel’s commitment to deliver innovation that exceeds the specific requirements of the space market,” said Eric Toulouse, Vice-President and General Manager of IR HiRel.


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