Vishay Intertechnology Inc. has introduced a power metal strip resistor with a resistance range of 10 milliOhms to 100 milliOhms and 1% tolerance; a new series of tantalum chip capacitors, and two new phototriacs.
The 2 W Vishay Dale WSL2816 power metal strip resistor is optimized for current sensing, voltage division, and pulse applications such as motor controls and dc-to-dc converters in automotive, consumer and industrial systems. The low resistance value of the surface-mount WSL2816 allows designers to use a single resistor instead of multiple higher-value resistors in parallel, or to replace larger, low-value resistors with a smaller 2816 footprint. The WSL2816 operates from –65 °C +170 °C.
Vishay Sprague TR3 series molded tantalum chip capacitors feature ESR values down to 0.035 Ohms and maximum ripple current values up to 2.07 A (100 kHz, 470 microfarads). The capacitors are available in A, B, C, D, and E molded case sizes with 100% tin terminations (RoHS-compliant), or 90/10 Sn/Pb terminations upon request. Capacitance values range from 0.47 µF microfarads to 680 µF with standard capacitance tolerances of ±10% and ±20%. Voltage ratings range from 4 WVdc to 50 WVdc. TR3 series capacitors operate from –55 °C to +85 °C, or +125 °C with voltage derating.
Vishay Semiconductors VO4157 and VO4158 phototriacs feature a trigger of 1.6 mA and a static dV/dt greater than 5 kV/microsecond. Packaged in a six-pin DIP, the zero-crossing (ZC) and non-zero-crossing (NZC) phototriac optocouplers are designed for switching AC loads and driving larger SCRs or TRIACs. The phototriacs consist of a GaAs infrared LED optically coupled to a photosensitive ZC TRIAC detector chip, a design that helps reduce EMI noise harmonics while featuring lower peak operating currents. Devices in the VO4257 and VO4258 series on NZC phototriacs can trigger at any time during the ac phase cycle and turn off at the next zero crossing, which suits them for many phase modulation applications.