Product Summary

The H21A1 is a phototransistor optical interrupter switch. It consists of a gallium arsenide infrared emitting diode coupled with a silicon phototransistor in a plastic housing. The packaging system of H21A1 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.

Parametrics

H21A1 absolute maximum ratings: (1)Operating Temperature: -55 to +100 ℃; (2)Storage Temperature: -55 to +100 ℃; (3)Soldering Temperature (Iron)(2,3 and 4): 240 for 5 sec ℃; (4)Soldering Temperature (Flow)(2 and 3): 260 for 10 sec ℃; (5)Continuous Forward Current: 50 mA; (6)Reverse Voltage: 6 V; (7)Power Dissipation: 100 mW; (8)Collector to Emitter Voltage: 30 V; (9)Emitter to Collector Voltage: 4.5 V; (10)Collector Current: 20 mA; (11)Power Dissipation (TC = 25℃): 150 mW.

Features

H21A1 features: (1)Opaque housing; (2)Low cost; (3).035" apertures; (4)High IC(ON).

Diagrams

H21A1 schematic diagram

Image Part No Mfg Description Data Sheet Download Pricing
(USD)
Quantity
H21A1
H21A1

Fairchild Semiconductor

Optical Switches, Transmissive, with Phototransistor Output INTERUP MOD TRANS

Data Sheet

Negotiable 
H21A1_Q
H21A1_Q

Fairchild Semiconductor

Optical Switches, Transmissive, with Phototransistor Output INTERUP MOD TRANS

Data Sheet

Negotiable