Found 4 alternatives for IS281-4 by Isocom Components 2004 LTD. Optoisolators Transistor Photovoltaic Output — 16-SOIC (0.173", 4.40mm Width).
OPTOISO 2.5KV 4CH TRANS 16-SSOP
OPTOISO 2.5KV 4CH TRANS 16SOIC
OPTOISO 2.5KV 4CH TRANS 16SOIC
OPTOISOLTR 2.5KV 4CH DARL 16SOIC