OLH5500 / OLH5501
Hermetic High-speed Optocouplers

The OLH5500/5501 are hermetic 8-pin DIP optocouplers for wide bandwidth analog applications, as well as for interfacing Transistor-to-Transistor Logic (TTL) to Low-Power Schottky Transistor-Transistor Logic (LSTTL) or Complementary Metal Oxide Semiconductors (CMOS). The OLH5501 product is a 100 percent high-reliability screened version of the OLH5500.

Each unit consists of an Aluminum Gallium Arsenide (AlGaAs) LED optically coupled to an integrated photodiode transistor detector. The separate photodiode and transistor configuration improves speed performance significantly over phototransistors. The base of the transistor is available for gain and bandwidth adjustments.

The OLH5500/5501 products are functionally compatible to 6N135, 6N136, 4N55, and HCPL5500/5501 optocouplers, but with better common mode transient immunity. Special Current Transfer Ratio (CTR) selection or no-transistor base connection versions for improved noise immunity is available upon request.

The performance of the OLH5500/5501 under a radiation environment is significantly improved over standard phototransistors.


  • Rugged, reliable hermetic Dual Inline Package (DIP)
  • Performance guaranteed over full military temperature range
  • High isolation voltage, 3000 VDC
  • High-speed, 400 Kbps typical
  • Open collector output
  • High common mode transient immunity >10,000 V/μs at VCM = 350 V
  • Radiation tolerant design
Data Sheets OLH5500/5501: Hermetic High-Speed Optocouplers OLH5500_5501_202295D.pdf (263 KB)
ProductName : OLH5500 / OLH5501
Memo :
Condition : TBD
CTR Min. : TBD
CTR Max. : TBD
Vcc Max. (V) : TBD
Propagation Delay : TBD
Isolation @ VDC 1 Sec. : TBD
Package Photo :
Package Info : 8-Lead Hermetic Dip
Radiation Tolerant : Yes
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