IR-4X series infrared sources

The IR-4X series consists of 4W thin film sources suitable for pulsing

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This infrared source is a thermal emitter with an emissivity of ~80%. It is appropriate for use in laboratory or field instrumentation due to its long life and stable properties.

These thin film units operate at ~600°C when powered with 4 watts for the IR-40 or 1.2 watts for the IR-43. The radiating element is an approximately 1.5 micron thin film of precision laser trimmed resistance material. The IR-40 element is permanently bonded to a flat substrate of alumina forming a stable platform. This contributes to a uniform radiating source. The unit does not require operation in a sealed atmosphere. The thin film design results in a low mass of radiation material.

IR-40 The IR-40 unit is attached to a TO-5 header with high temperature cement. This unit is also offered without a cap (as an IR-40NC) and with a cap and sapphire window (as an IR-40S).

The IR-43 unit is free standing on a TO-5 header. It requires less power to achieve the same temperature as the IR-40. Without a directly connected mass to draw of heat, it is more responsive.

Operating Specifications


  • Voltage: 35 Volts (AC or DC)
  • Temperature: 600°C
  • Current: 115 mA
  • Power: 4.0 Watts
  • Active area: 3.5 mm x 2.5 mm
  • Emissivity: 0.80
  • Lifetime: 3+ years at 600°C, typical


  • Voltage: 14 Volts (AC or DC)
  • Temperature: 600°C
  • Current: 90 mA
  • Power: 1.3 Watts
  • Active area: 1.5 mm x 1.5 mm
  • Emissivity: 0.80
  • Lifetime: 3+ years at 600°C, typical



An interactive pdf data sheet is available for all Hawkeye IR sources ( 8 MB ):

IR source data sheet