Dual Channel, Radiation Tolerant, Phototransistor Hermetic Surface Mount Optocoupler

The OLS2449 is specifically designed 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 channel consists of an LED and N-P-N silicon phototransistor that is electrically isolated, but optically coupled inside a hermetic 8-pin leadless chip carrier (LCC) package.

The electrical parameters are similar the JEDEC registered 4N49U optocoupler, but with a higher CTR and better CTR degradation characteristics due to radiation exposure.

The OLS2449 has 100 percent high-reliability screening parts available. Contact us for more details.


Product LifecycleIn Production
MemoDual Channel
ConditionCTR @ IF = 1 mA
CTR Min.1500
CTR Max.4000
Vcc Max. (V)
Switching Time (μs)25
Isolation @ VDC 1 Sec.1500
Package Photo
Package Info8-Lead Hermetic Ceramic LCC
Radiation TolerantYes
No Base ConnectionYes


  • Same reliable processing and construction as the OLS049, but with a higher current transfer ratio (CTR)
  • CTR is:
    • Guaranteed over –55 °C to +100 °C ambient temperature range
    • High at low LED currents
  • High BVCEO, 65V minimum
  • 1500 VDC electrical isolation
  • High-reliability screening is available

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