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    Thick-Film Power Resistors Enhance Protection Against Transient Pulses

    May 7, 2025
    The automotive-grade resistors from Vishay offer high pulse absorption, power dissipation of 150 W, and a clip-mount package for direct mounting on a heatsink.
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    Vishay Intertechnology expanded its LTO series of thick-film power resistors with a new AEC-Q200-qualified device that delivers higher pulse absorption up to 75 J/0.1 s (30% higher than previous LTO devices) and power dissipation of up to 150 W. Applications include precharge or discharge resistor for controls, 48-V board nets, BMS, fuel cells, and onboard chargers for HEVs, EVs, and low-speed EVs. Other potential fits are energy monitoring and metering systems, industrial motor drives, welding equipment, and power tools.

    Offered in a clip-mount TO-247 package for direct mounting on a heatsink, the LTO 150H offers not only high power dissipation, but low thermal resistance of 0.87°C/W (with 150-W power dissipation) at a +45°C case temperature. The LTO 150H series operates up to +175°C and features a broad range of resistance values from 1 Ω to 2.2 kΩ, as well as tolerances down to ±2 %.

    Samples and production quantities of the LTO 150H are available now, with lead times of 10 weeks. Pricing for U.S. delivery starts at $3.53 per piece in 10,000-piece quantities. Additional information is available here.

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    About the Author

    Lee Goldberg | Contributing Editor

    Lee Goldberg is a self-identified “Recovering Engineer,” Maker/Hacker, Green-Tech Maven, Aviator, Gadfly, and Geek Dad. He spent the first 18 years of his career helping design microprocessors, embedded systems, renewable energy applications, and the occasional interplanetary spacecraft. After trading his ‘scope and soldering iron for a keyboard and a second career as a tech journalist, he’s spent the next two decades at several print and online engineering publications.

    Lee’s current focus is power electronics, especially the technologies involved with energy efficiency, energy management, and renewable energy. This dovetails with his coverage of sustainable technologies and various environmental and social issues within the engineering community that he began in 1996. Lee also covers 3D printers, open-source hardware, and other Maker/Hacker technologies.

    Lee holds a BSEE in Electrical Engineering from Thomas Edison College, and participated in a colloquium on technology, society, and the environment at Goddard College’s Institute for Social Ecology. His book, “Green Electronics/Green Bottom Line - A Commonsense Guide To Environmentally Responsible Engineering and Management,” was published by Newnes Press.

    Lee, his wife Catherine, and his daughter Anwyn currently reside in the outskirts of Princeton N.J., where they masquerade as a typical suburban family.

    Lee also writes the regular PowerBites series. 

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