Radiation-Tolerant Phototransistor Non-Hermetic Surface-Mount Optocoupler

The OLC249 can be used for large satellite constellation applications that require optical isolation in radiation environments such as gamma, neutron, and proton radiation with a high CTR and low saturation VCE. Each optocoupler consists of an LED and N-P-N silicon phototransistor that is electrically isolated, but optically coupled inside a non-hermetic six-pin Leadless Chip Carrier (LCC) package.

Electrical parameters are similar to the JEDEC registered 4N49 optocoupler, but with a higher CTR and better CTR degradation characteristics due to radiation exposure.

The hermetic surface mount variant of the OLC249 optocoupler is available as the OLS249, both in a non-screened catalog version as well as a high-reliability screened version.

The OLC249 is designed for a low LED operating current while providing excellent radiation tolerance margins.


    • Non-Hermetic SMT package
    • 1000 VDC electrical isolation
    • High CTR
    • Small package size
    • Radiation tolerant

Images & Diagrams

  • OLC249 top angle image
  • OLC249 top angle image
  • OLC249 bottom
  • OLC249 block diagram


    • 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.
    • 1500
    • Package Photo
    • Package Info
    • 6-Lead Non Hermetic LCC
    • Radiation Tolerant
    • Yes
    • No Base Connection

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