Thermistors Deliver Energy Ratings to 12 J and Current to 4 A

Ametherm recently released a new series of UL-approved circuit protection thermistors with high energy and steady state current ratings for inrush current limiting in power supplies from 50 W to 200 W, 1/8 HP motors and small pumps, lighting, and audio charging stations for portable consumer devices.

The new SL08 series thermistors feature maximum received energy ratings from 8 J to 12 J and handle steady state currents up to 4 A. The devices offer a wide range of resistance values from 2.5 W to 220 W, dissipation constants from 5.2 mw/°C to 90 mw/°C, and thermal time constants down to 8 s. The thermistors can handle body temperatures up to 158 °C at 100% of their maximum current rating.

Offering diameters from 7.5 mm to 9.0 mm and low profiles down to 2.8 mm, SL08 series devices provide designers with a more compact and cost-effective alternative to combining a power resistor, relay, and timer on one circuit to achieve the same functionality.

SL08 thermistors are available direct from Ametherm or through distributors such as Mouser, Digi-Key, Newark element14, and Farnell. Samples and production quantities of the devices are available now, with factory lead times of four to five weeks. Volume pricing for U.S. delivery starts at $0.20 per piece.