Found 8 alternatives for H21A3 by Isocom Components 2004 LTD. Optical Sensors Photointerrupters Slot Type Transistor Output — Slotted, PC Pins.
TRANSISTOR OUTPUT SLOTTED SWITCH
TRANSISTOR OUTPUT SLOTTED SWITCH
SENSOR OPT SLOT NPN PC PINS
SENSOR OPT SLOT PHOTOTRAN PC PIN
SENSOR OPT SLOT PHOTOTRAN PC PIN
SENSOR OPT SLOT PHOTOTRAN PC PIN
TRANSISTOR OUTPUT SLOTTED SWITCH
SENSOR OPT SLOT PHOTOTRAN PC PIN