BI develops high-reliability resistor networks
BI Electronics
Thin-film resistor networks
BI Technologies offers a series of custom thin-film resistor networks in hermetically-sealed metal or HTCC (high-temperature cofired ceramic) packages.
The Model 144 Series high-reliability resistor networks can be specified with custom schematics, non-standard resistance values and ultra-tight resistance and TCR tolerances to meet the requirements for military electronics systems, avionics and aerospace circuits.
According to Mike Torres, fixed-film product manager for BI Technologies Electronic Components Division, the Model 144 Series thin-film custom resistor networks provide tighter resistance tolerances and TCR tracking performance than other precision networks.
'We can produce custom networks with up to 25 resistors that mix and match resistor values based on the customer's requirements,' he said.
'And, through our processing and packaging, we can achieve ratio tolerances between individual resistors in the network to less than +/-0.01 per cent and TCR tracking tolerances to less than +/-1ppm/C,' he added.
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 flat-pack packages with three to 28 pins, the Model 144 Series networks also features a 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 suitable for a wide range of applications, including instrumentation amplifiers, precision voltage dividers, measurement bridge circuitry, ladder networks and other precision analogue circuits in aerospace and military electronic systems.
The Model 144 Series custom resistor networks feature resistance values from 10ohms to 3Mohms, in tolerances down to +/-0.025 per cent (ratio tolerances to +/-0.01 per cent), in ratio values up to 1:1,000.
Typical TCRs are +/-25ppm/C, with tracking between resistors available to +/-1ppm/C.
Operating temperature range is from -55C to +175C.
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.
Typical lead times for the Model 144 Series custom resistor networks are from 10 to 16 weeks, with no minimum order quantity required.
More stories
Ohmite offers HVC series of terminal chip resistors for medical electronics
The HVC series of wraparound terminal chip resistors from Ohmite have been designed for use as high-voltage resistors within renewable energy, military and medical electronics, as well as in vacuum applications.
Linear Technology resistors suitable for heavy industrial test equipment download
Linear Technology’s LT5400 series of resistors is suitable for signal conditioning applications in difference amplifiers, precision dividers, references and bridge circuits, as well as in test equipment within heavy industrial, military and automotive environments.
AVX offers miniature AC multilayer varistor for use in automotive low-power AC circuits
AVX has introduced the MAV series — a miniature, dual-element AC multilayer varistor (MLV) that is claimed to have an ‘exceptionally high’ ESD value and small footprint, making it suitable for typical automotive and harsh-environment applications.
Isabellenhütte Heusler offers small resistors designed for use in bright LED applications weblink
Isabellenhütte Heusler has introduced the VMK and VLK ranges of resistors, which are designed to be compact and robust to suit use in LED technology.
Digi-Key offers RNV high-voltage resistors suitable for high-humidity environments
Now available from Digi-Key, Stackpole Electronics’ RNV high voltage, anti-moisture, thru-hole resistors are designed to handle high-voltage surges, up to 7KV for 50 surges per IEC 60065.14.1, as well as high humidity without significant resistance shift.
