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High Temperature Feed-Through EMI Filters

High Temperature Feed-Thruough Filters

API’s high temperature epoxy sealed, bolt-in style EMI feedthrough filters are capable of continuous operation at 175˚C with an average coefficient of -25% at max operating temperature.



  • Consistent operating properties from -55 to +175˚C
  • Meet applicable requirements of MIL-PRF-15733, including mechanical shock, vibration and 1000 hour life testing at +175˚C
  • Temperature coefficient at +175˚C is ±25%
  • Capacitance and voltage rating can be configured to meet customer requirements
  • Available in the same performance range as API’s existing EMI feedthrough offerings, which allows for convenient drop in replacement for existing designs that now require higher temperature performance
  • RoHS compliant


  • Down hole Oil & Gas
  • Engine controls - jet or reciprocating engines
  • Heavy industrial sensors
  • Power conversion and generation


High Temperature EMI Filter Specifications
Lead Finish Silver
Bushing Finish Silver
Circuit Feed-thru
Capacitance Up tp 1µf
Temp. Range -55°C to +175°C
Current Range Up to 25 Amps
Working Voltage Up to 500 VDC