DESCRIPTION
The H21A Slotted Optical Switch is a gallium arsenide light emitting diode coupled to a silicon phototransistor in plastic housing. The packaging system is designed to optimize the mechanical resolution, coupling efficiency, ambient light rejection, cost and reliability. The gap in the housing provides a means of interrupting the signal with an opaque material, switching the
output from an “ON” to an “OFF” state.

FEATURES
• Opaque housing
• Low cost
• .035” apertures
• High IC(ON)