Date: 29th Jan 09

 Vishay has released a high current inductor and a high tolerant resistor

Vishay Intertechnology has announced the industry’s first winged low-profile, high-current inductor. Designed to be placed on a cut-out PCB, the IHLW-5050CE-01 offers designers a high-current solution using a larger part, without exceeding a profile of 1.2 mm on either side of the PC board.

With a frequency range up to 5 MHz, the new IHLP inductor serves as a high-performing, space- and power-saving solution for voltage regulator module (VRM) and dc-to-dc converter applications in end products including next-generation mobile devices; notebooks, desktop computers, servers, graphic cards, portable gaming devices, personal navigation systems, personal multimedia devices, and automotive systems; low-profile, high-current power supplies and point of load (POL) converters; distributed power systems; and field-programmable gate arrays (FPGAs).

The IHLW-5050CE-01 offers an inductance range from 0.10 µH to 10 µH, a saturation current range from 14.0 A up to 84 A, typical DCR from 0.8 m? to 30.4 m?, and maximum DCR from 0.96 m? to 34.0 m?.

The new inductor handles high transient current spikes without hard saturation. Packaged in an RoHS-compliant, 100 % lead (Pb)-free shielded, composite construction that reduces buzz noise to ultra-low levels, the new device is specified for an operating temperature range of 55 °C to +125 °C, with high resistance to thermal shock, moisture, mechanical shock, and vibration.

Samples and production quantities of the new inductor are available now, with lead times of 10 to 12 weeks for large orders.

Vishay also extended the resistance tolerance of the RNC90Z family of military- established, Bulk Metal Z-Foil reliability resistors down to ±0.005 %.

As “R” level established reliability resistors, RNC90Z devices are military-qualified to MIL PRF 55182/9, the standard for military and aerospace applications requiring long-term stability. The resistors’ ability to retain their initial value through temperature change, load application, frequency shift, and short-time overload is unmatched in the industry. Designers can expect the RNC90Z devices to display parts-per-million changes in service, as opposed to percentage changes that occur with thick and thin film resistors.

The enhanced devices offer a broad resistance range of 30.1 ? to 121 k?, very low TCR values of ±0.2 ppm/°C over an extended temperature range of 55 °C to +175 °C, and a load-life stability of ±0.005 % for 2000 hours at +125 °C. Vishay Foil resistors are not restricted to standard values, and Vishay can supply “as required” values (e.g., 100 k? vs. 100.123 k?) at no extra cost or delivery time. The resistors feature a power rating of 0.6 W at +70 °C and 0.3 W at +125 °C, with a maximum working voltage of 300 V. Each device measures 0.105 in. by 0.300 in. (2.67 mm by 7.62 mm), with a height of 0.326 in. (8.28 mm), and typically weighs 0.6 grams.

While other resistor technologies can take several seconds or even minutes to achieve a steady-state thermal stabilization, the RNC90Z devices have an almost instantaneous thermal stabilization time of < 1 second, and a nearly immeasurable 1.0-ns rise time, effectively without ringing. The ultimate resistors for analog applications, the devices are built to handle unconventional environmental conditions above and below the surface with minimal drift. Their construction guarantees a high level of reliability, and provides high resistance to thermal shock, moisture, mechanical shock, and vibrations. A short-time overload of 6.25 X rated power has no effect on the resistance of RNC90Z resistors once they normalize from the resultant temperature.

Offering the utmost in ESD immunity, the resistors withstand electrostatic discharges up to 25 kV, for increased reliability, and offer a non-inductive (< 0.08 µH), non-capacitive design. The RNC90Z devices are available only with tin/lead alloy terminations, and offer 0.15-in lead spacing, with a 0.2-in version available, the RNC90S.

Prototype samples and production orders of the RNC90Z resistors are available now, with lead times from eight weeks.