SOURCE: Ametherm


April 09, 2015 11:00 ET

Ametherm Launches Industry-First 277 V Thermistor for LED Lighting, PFC, and Power Supply Applications

New Device Features Industry-Best Current, Energy, and Power Ratings

CARSON CITY, NV--(Marketwired - Apr 9, 2015) - Ametherm today released a new UL-approved circuit protection thermistor that is the industry's first to offer a 277 V rating optimized for applications including LED lighting and ballasts, power factor correction (PFC) circuits, and inrush current control in uninterruptible power supplies (UPS) with ratings under 500 W.

Ametherm's new SL10 10003 thermistor features the highest energy, continuous current, and ambient temperature ratings for any device in its size and class. The device handles steady state current up to 3 A with a maximum received energy rating of 17 J. The device features a dissipation constant of 11 mW/°C and can handle a body temperature of 151°C at 100% of its maximum current rating. Maximum capacitance at the device's 277 V voltage rating is 200 microfarads.

The SL10 10003 provides a more compact alternative to larger NTC devices or the more expensive combination of a power resistor, relay and timer or implementation of the same functionality with active circuits.

"The SL10 10003 thermistor is the simplest and most cost-effective way to limit inrush current in LED driver and ballast circuits, as well as in PFC circuits," said Eric Rauch, president and CEO at Ametherm. "It's a unique made-in-USA, UL-approved way for designers to get the 277 V headroom they need for more reliable LED lighting circuitry and for power supplies with ratings under 500 W."

The SL10 10003 thermistor is available direct or through distributors such as Mouser, Digi-Key, Newark element14, and Farnell. Samples and production quantities of the SL10 10003 are available now, with factory lead times of four to five weeks.

For more information or to request a sample, visit Or call 800-808-2434 (toll free in the United States) or 775-884-2434 from outside the U.S. and Canada.

About Ametherm
Ametherm, headquartered in Carson City, Nev., was founded in 1994 and specializes in inrush current limiting power thermistors for circuit protection in the power market industry. Ametherm's devices are some of the highest rated in the industry and provide the widest range of inrush current protection available. For more information, visit or call 800-808-2434.

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Contact Information

  • Agency Contact:
    Bob Decker
    +1 415 409 0233
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    Ametherm Contact:
    Lori Morton
    +1 775 884 2434
    Email Contact