Vishay precision resistor network devices

Vishay has released hermetically sealed precision resistor network devices (PRNDs) with a screen/test flow in compliance with EEE-INST-002 (Tables 2A and 3A, film/foil, Level 1) and MIL-PRF-83401.

For high-reliability military and aerospace applications such as satellites, space rovers and deep-space probes, the PRNDs provide low absolute TCR of ±2 ppm/°C typical from -55 to +125°C, +25°C ref.; load-life stability to ±0.05% typical; and a load-life ratio stability of ±0.02% typical at +70°C for 2000 h at rated power.

Custom configured to requested circuit schematics and specifications, the devices are hermetically sealed networks consisting of multiple bulk metal foil hybrid chip resistors connected by gold-wire bonding inside ceramic packages.

Using bulk metal foil technology, they have low TCR, good tolerance matching and tracking, and small drifts with load over time.

Performance is said to be up to 15 times better than the requirements of the MIL-PRF-83401 spec.

The combination of the ceramic package - which has the advantage of electrical isolation on the underside and high heat dissipation capability - hermetic sealing, and the arrangement of the chips within the package, helps preserve uniform conditions inside it for maximum environmental protection.

Offered in dual-in-line, flatpack, gull wing and leadless chip carrier package configurations, they feature a wide resistance range from 5 Ω per chip, with lower and higher values available with tolerance matching to ±0.005%. Any resistance value within this range is available at any tolerance. They have a power rating to 1.4 W per package (150 mW per resistor) at an ambient temperature of +70°C.