H21A1 datasheets – compare manufacturers

Manufacturer Part Number Description
Fairchild Semiconductor Logo Fairchild H21A1 PHOTOTRANSISTOR OPTICAL INTERRUPTER SWITCH
QT Optoelectronics Logo QT Optoelectronics H21A1 SLOTTED OPTICAL SWITCH
ISOCOM Logo ISOCOM H21A1 Photointerrupters