Radiation Tolerant Phototransistor Hermetic Surface Mount Optocoupler

The OLF249 consists of an LED that is optically coupled to an N-P-N silicon phototransistor mounted in an 8-pin hermetic surface mount flat-pack package. The leads can be formed to provide compliant solder connections to the mounting substrate.

Electrical parameters are similar to the JEDEC registered 4N49 optocoupler, but with much better current transfer ratio (CTR) degradation characteristics due to radiation exposure. Special electrical parametric selections are available on request.


  • Hermetic SMT package
  • Compliant surface mounting leads
  • High current transfer ratio
  • Small package size
  • High reliability and rugged construction
  • High-reliability screening available
  • Radiation tolerant
Data Sheets OLF249 Data Sheet OLF249_202233C.pdf (282 KB)
Application Notes Skyworks Optocouplers vs. Pulse Transformers Optocouplers_vs_Pulse_Transformers_204659A_AN.pdf (108 KB)
White Paper Optocouplers for the Hybrid industry WP_Optocouplers_for_the_Hybrid_industry.pdf (322 KB)
White Paper Discussion of RGA Test for Moisture Content for Isolink Optocouplers WP_RGA_2017_Feb.pdf (123 KB)
ProductName : OLF249
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. : 1000/3000
Package Photo :
Package Info : 8-Lead Hermetic Ceramic Flat
Radiation Tolerant : Yes
No Base Connection :
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