Radiation Tolerant Phototransistor Hermetic Optocoupler

The OLH1249 is designed especially for high-reliability applications that require optical isolation in radiation environments such as gamma, neutron, and proton radiation with high CTR and low saturation VCE. The OLH1249 consists of an LED and N-P-N silicon phototransistor mounted and coupled in an 8-pin hermetically sealed DIP package. Electrical parameters are similar to the OLH1049 and 4N49, but have much better CTR degradation characteristics due to radiation exposure.

High-reliability screening and special CTR selections are available (contact Isolink for more information).


  • Current Transfer Ratio (CTR) guaranteed over –55 °C to
  • +100 °C ambient temperature range
  • 3000 VDC electrical isolation
  • Standard 8-pin DIP configuration
  • Radiation tolerant version of OLH1049
Data Sheets OLH1249: Radiation-Tolerant Phototransistor Hermetic Optocouplers OLH1249_202293E.pdf (276 KB)
ProductName : OLH1249
Memo :
Condition : TBD
CTR Min. : TBD
CTR Max. : TBD
Vcc Max. (V) : TBD
Switching Time (μs) : TBD
Isolation @ VDC 1 Sec. : TBD
Package Photo :
Package Info : 8-Lead Hermetic Dip
Radiation Tolerant : Yes
No Base Connection :
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