High-speed Hermetic Optocoupler

The OLH300 is suitable for interfacing Transistor-Transistor Logic (TTL) to Low Power Schottky Transistor-Transistor Logic (LSTTL), TTL, or Complementary Metal Oxide Semiconductor (CMOS), as well as wide bandwidth analog applications.

Each OLH300 has an LED and an integrated photodiode transistor detector that is mounted and coupled in a ceramic substrate inside a hermetic TO-5 package that provides 1000 VDC of electrical isolation between the input and output. The integrated photodiode transistor improves the switching speed by orders of magnitude as compared to standard phototransistors by reducing the base-to-collector capacitance. The internal shield provides excellent common-mode immunity performance.


  • Electrical parameters guaranteed over –55 °C to +125 °C ambient temperature range
  • 1000 VDC electrical isolation
  • High-speed, 1 Mbps typical
  • Open collector output
  • 300 KHz bandwidth
  • TO-5 hermetic package
  • Similar to 6N135/6N136, 4N55
  • Radiation tolerant
  • Offers 100% high-reliability screening
Data Sheets OLH300 Data Sheet OLH300_202681D.pdf (344 KB)
Application Notes Gamma Total Dose Radiation Performance Gamma_total_dose_radiation_performance_204662A_AN.pdf (393 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 Proton Radiation Graph WP_Proton_radiation_graph.pdf (517 KB)
White Paper Discussion of RGA Test for Moisture Content for Isolink Optocouplers WP_RGA_2017_Feb.pdf (123 KB)
ProductName : OLH300
Memo :
Condition : CTR @ IF = 10 mA
CTR Min. : 20
CTR Max. :
Vcc Max. (V) : 18
Propagation Delay : 2µs Max.
Isolation @ VDC 1 Sec. : 1000
Package Photo :
Package Info : 6-Lead Hermetic TO-5
Radiation Tolerant : Yes
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