The H21B1 from FAIRCHILD manufacturer is a Optical Sensors - Photointerrupters - Slot Type - Transistor Output with PHOTODARLINGTON OPTICAL INTERRUPTER SWITCH,Photointerruptors INTERUP MOD DARL. The H21B1 is PHOTOINTERRUPTER TRANSMISSIVE 3.3MM PHOTODARLINGTON 4PIN The H21B1, H21B2 and H21B3 consist of a gallium arsenide infrared emitting diode coupled with a silicon photodarlington in a 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. Product Highlights: Opaque housing Low cost .035-inch apertures High IC(O PHOTODARLINGTON- 2 TABS- SLOTTED SWITCH<> OPTO SWITCH, SLOTTED; No. of Channels:1; Output Type:Darlington; Input Current:7.5mA; Voltage, Output Max:30V; Case Style:Slotted Switch; Operating Temperature Range:-55°C to +100°C; Current, If AV:10mA; External Depth:6.35mm; External Length / Height:10.8mm; Fixing Centres:19mm; No. of Pins:4; Optocoupler Type:Opto Switch; Row Pitch:7.2mm; Time, Fall:250s; Time, Rise:45s; Voltage, Vce Sat Max:1V; Width, External:24.7mm; Width, Gap:3.1mm Optoswitch; No. of Channels:1; Optocoupler Output Type:Transistor; Input Current Max:60mA; Output Voltage Max:30V; Leaded Process Compatible:Yes; No. of Pins:4; Operating Temperature Range:-55°C to +100°C; Voltage Rating:30V ;RoHS Compliant: Yes Photointerrupter Transmissive 3.3mm Photodarlington 4-Pin Rail Slotted Optical Switch Infrared Emitter/Sensor Assemblies INTERUP MOD DARL. More details for H21B1 can be seen below.
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