Radiation Tolerant, Phototransistor Hermetic Surface Mount Optocoupler

The OLS049 is specifically designed for high-reliability applications that require optical isolation in radiation environments such as gamma, neutron, and proton radiation with a high current transfer ratio (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 hermetic, 4-pin leadless chip carrier (LCC) package.

Electrical parameters are similar to the JEDEC registered 4N49U optocoupler, but with better CTR degradation characteristics due to radiation exposure. The OLS049 has 100 percent high reliability screened parts available.

The device mounting for the OLS049 is achieved with reflow soldering or conductive epoxies.


  • Miniature hermetic surface mount package
  • Radiation tolerant
  • High CTR guaranteed over –55 °C to +125 °C ambient temperature range
  • 1000 VDC electrical isolation
  • High reliability screening is available
Data Sheets OLS049 Data Sheet OLS049_202469E.pdf (253 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 : OLS049
Memo :
Condition : CTR @ IF = 1 mA
CTR Min. : 200
CTR Max. : 1200
BVCEO (V) : 60
Vcc Max. (V) :
Switching Time (μs) : 25
Isolation @ VDC 1 Sec. : 1000
Package Photo :
Package Info : 4-Lead Hermetic Ceramic LCC
Radiation Tolerant : Yes
No Base Connection : Yes
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