The PS9121 is an optically coupled high-speed, active low type isolator containing a GaAlAs LED on the input side and a photodiode and a signal processing circuit on the output side on one chip. The PS9121 is designed specifically for high common mode transient immunity (CMR) and low pulse width distortion. The PS9121 is suitable for high density application.


  • Low power consumption (VCC = 3.3 V)
  • Pulse width distortion (⏐tPHL − tPLH⏐ = 35 ns MAX.)
  • High common mode transient immunity (CMH, CML = ±15 kV/μs MIN.)
  • Small package (SO-5)
  • High-speed (15 Mbps)
  • High isolation voltage (BV = 3 750 Vr.m.s.)
  • Open collector output
  • Ordering number of taping product: PS9121-F3, F4: 2 500 pcs/reel
  • Pb-Free product
  • Safety standards UL approved: File No. E72422 DIN EN60747-5-2 (VDE0884 Part2) approved No.40008902 (option)

Product Options

Part Number PLP Part Status Pkg. Type Carrier Type Buy Sample
2028-07-01 Active
2028-07-01 Active

Documentation & Downloads

Title Other Languages Type Format File Size Date
Datasheets & Errata
PS9121 DS (PN10502EJ05V0DS) 日本語 Datasheet PDF 293 KB
Application Notes & White Papers
Photocouplers Applications Note Application Note PDF 957 KB
Photocouplers Brochure 日本語 Brochure PDF 4.39 MB
Photocouplers Selction Guide 日本語 Brochure PDF 4.34 MB
PHOTOCOUPLERS Catalog ( R08CP0001EC0100 ) Brochure PDF 9.83 MB