Power Electronics

BI Technologies Offers Ultra-Precision High-Reliability Custom Resistor Networks for Military/Aerospace Applications

BI Technologies offers a series of custom thin film resistor networks in hermetically-sealed metal or HTCC (high-temperature configured ceramic) packages. Designated the Model 144 Series, these high-reliability resistor networks can be specified with custom schematics, non-standard resistance values and ultra-tight resistance and TCR tolerances to meet the unique requirements for military electronics systems, avionics and aerospace circuits.

The Model 144 Series thin film custom resistor networks provide tighter resistance tolerances and TCR tracking performance than other precision networks. BI can produce custom networks with up to 25 resistors that mix and match resistor values based on the customer's requirements. With proprietary processing and packaging, they can achieve ratio tolerances between individual resistors in the network down to <±0.01%, and TCR tracking tolerances to <±1ppm/°C."

The networks' construction and packaging is designed specifically for high reliability applications where plastic packaged devices cannot be specified due to elevated temperatures or other harsh environmental conditions. Available in hermetically sealed through-hole DIP and surface mount flatpack packages with 3 to 28 pins, the Model 144 Series networks also feature a proprietary passivation coating over the precision nichrome resistive elements to protect against humid environments, and the package cavity
is filled with inert nitrogen.

The custom high-reliability resistor networks are ideal for a wide range of applications, including instrumentation amplifiers, precision voltage dividers, measurement bridge circuitry, ladder networks and other precision analog circuits in aerospace and military electronic systems.

The Model 144 Series custom resistor networks feature resistance values from 10 ohms to 3Mohms, in tolerances down to ±0.025% (ratio tolerances to ±0.01%), in ratio values up to 1:1000. Typical TCRs are ±25ppm°/C, with tracking between resistors available to ±1ppm/°C. Operating temperature range is from -55°C to +175°C. Screening and testing to MIL-STD-883, MIL-STD-1835, MIL-PRF-38534, MIL-STD-38510 and MIL-STD-202 is available on request. The Model 144 Series networks can also be ordered in RoHS-compliant versions.

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