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Resistors tolerate >25kV electrostatic discharge

Posted: 24 Nov 2011 ?? ?Print Version ?Bookmark and Share

Keywords:foil resistor? hybrid circuit? high-temperature application?

Vishay Precision Group Inc. has rolled a series of ultra-high-precision Bulk Metal Z1-Foil hybrid chip resistors. According to the company, the devices are designed for hybrid circuits with aluminum wire bonding technology and high-temperature applications to 240C.

The HTHA series is based on the company's Z1-Foil technology that provides an order of magnitude reduction in the Bulk Metal Foil element's sensitivity to temperature changesboth external and internalwhile providing long-term stability in high-temperature environments, noted Vishay. The devices offer TCR of 1ppm/C from -55C to 125C and 2.5ppm/C from -55C to 220C, 25C ref. The resistors feature exceptional load-life stability to 0.05 percent at 220C for 2,000 hours at working power, long-term stability to 0.05 percent at 240C for 2,000 hours (no power), and tight tolerances to 0.02 percent, added the company. The devices are capable of withstanding electrostatic discharges to at least 25kV without degradation.

The HTHA series is offered in six case sizes ranging from 0603 to 2512 and features working power to 150mW at 220C. The devices provide a wide resistance range from 5? to 125k?, with any resistance value within this range available at any tolerance with no additional cost or lead time effect. The resistors feature a rise time of 1ns, with effectively no ringing, a thermal stabilization time of less than one second (nominal value achieved within 10ppm of steady state value), current noise of 0.010?V/rms per volt of applied voltage (less than -40dB), and a voltage coefficient of less than 0.1ppm/V.

Vishay stated that the HTHA series is optimized for many high-temperature applications including geothermal measuring equipment, turbine engine control, and environmental test chambers in military, industrial, automotive and down-hole drilling systems. Many analog circuits in these applications require passive components such as resistors to have a minimal drift from their initial values when operating above 175C and in humid environments. In high-temperature applications, the most important factor is the end-of-life tolerance, and, to a lesser extent, the initial tolerance. HTHA resistors provide stabilities well under the maximum allowable drift required by customers' specifications through thousands of hours of operation under harsh conditions, claimed Vishay.

Samples and production quantities of the HTHA series are available with lead times of five weeks for samples and eight weeks for standard orders.

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