Malvern, Pa. Vishay Intertechnology, Inc. has extended its family of thickfilm power resistors with the introduction of 30-W, 50-W and 100-W devices in industry-standard TO220 and TO247 packages. The resistors use a ceramic package design (with no metal tab) for direct-mounting onto heat sinks, which improves heat dissipation and reduces board space on PC-boards. In addition, they feature an exceptionally low inductance of less than 0.1 μH, making them suitable for use in power conversion and control applications.
The new Vishay Sfernice devices are available in a wide range of resistance values from 0.010Ω to 550kΩ for the LTO 30 and LTO 50 families, and from 0.015Ω to 1MΩ for the LTO 100. All of the devices have a temperature coefficient of 150 ppm/°C for values above 0.5Ω.
The LTO resistors are designed for use in pulse-loading applications, such as snubber or bleeder resistors, and in a variety of other high-power equipment such as uninterruptible power supplies (UPS), power conversion for traction and industrial drives, and in medical, automotive, and industrial control environments. The company said it uses an optimized process of printed thickfilm technology on an alumina substrate to achieve tolerances as low as ±1 %, and up to ±10 %.
All of the resistors are compatible with tin/lead (Sn/Pb) and lead-free soldering processes, which allows for use by all assemblers transitioning to lead-free processes to meet upcoming legislation and voluntary environmental manufacturing codes. In addition, all devices comply with the EU directives on vehicle end of life, including 2000/53/EC End of Vehicle Life Directive (ELV) and 2000/53/EC Annex II to End of Vehicle Life Directive (ELV II). All devices also meet 2002/95/EC Restriction of the use of Hazardous Substances Directive (RoHS) and 2002/96/EC Waste Electrical and Electronic Equipment Directive (WEEE).
Pricing for U.S. delivery starts at $1.50 each in quantities of 5,000. Samples and production quantities of the LTO resistors are available now, with a lead time of eight weeks for larger orders.
Vishay Sfernice/Spectrol, 1-909-923-3313, ext. 101, www.vishay.com