Radiation Tolerant Phototransistor Hermetic Optocoupler

The OLH249 is designed especially for high-reliability applications that require optical isolation in radiation environments, such as gamma, neutron, and proton radiation with high current transfer ratio (CTR) and low saturation VCE. Each optocoupler consists of an LED and N-P-N silicon phototransistor electrically isolated, but optically coupled inside a hermetic TO-5 package. Electrical parameters are similar to the JEDEC registered 4N49 optocoupler, but have much better CTR degradation characteristics due to radiation exposure. The OLH249 has 100 percent high-reliability screened parts available. Contact us for more details.


    • Radiation-tolerant version of 4N49
    • Current Transfer Ratio (CTR) guaranteed over –55 °C to
    • +100 °C ambient temperature range
    • 1000 VDC electrical isolation
    • High CTR
    • Standard TO-5 hermetic package
    • High reliability screening available

Images & Diagrams


    • Memo
    • Condition
    • CTR @ IF = 1 mA
    • CTR Min.
    • 200
    • CTR Max.
    • 1200
    • BVCEO (V)
    • 40
    • Vcc Max. (V)
    • Switching Time (μs)
    • 25
    • Isolation @ VDC 1 Sec.
    • 1000
    • Package Photo
    • Package Info
    • 6-Lead Hermetic TO-5
    • Radiation Tolerant
    • Yes
    • No Base Connection

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