Found 4 alternatives for PC3SD11NTZBH by SHARP/Socle Technology. Optoisolators Triac Scr Output — 4-DIP (0.300", 7.62mm).
OPTOISOLATOR 2.5KV TRIAC 4DIP
OPTOCOUPLER PHOTOTRIAC 800V DIP4
PHOTOTRIAC COUPLER 600V 4DIP
OPTOISOLATOR 5KV TRIAC 4DIP