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| PartNumber | H21B5 | H21B1 | H21B2 |
| Description | Optical Switches, Transmissive, Phototransistor Output Slotted Opt Switch | Optical Switches, Transmissive, Phototransistor Output INTERUP MOD DARL | Optical Switches, Transmissive, Phototransistor Output INTERUP MOD DARL |
| Manufacturer | ON Semiconductor | ON Semiconductor | ON Semiconductor |
| Product Category | Optical Switches, Transmissive, Phototransistor Output | Optical Switches, Transmissive, Phototransistor Output | Optical Switches, Transmissive, Phototransistor Output |
| RoHS | Y | Y | Y |
| Slot Width | 3.3 mm | 3.3 mm | 3.3 mm |
| Aperture Width | 0.889 mm | 0.889 mm | 0.889 mm |
| Collector Emitter Voltage VCEO Max | 55 V | 30 V | 30 V |
| Maximum Collector Current | 40 mA | 40 mA | 40 mA |
| If Forward Current | 50 mA | 50 mA | 50 mA |
| Minimum Operating Temperature | - 55 C | - 55 C | - 55 C |
| Maximum Operating Temperature | + 100 C | + 100 C | + 100 C |
| Packaging | Tube | Tube | Tube |
| Height | 11 mm | 11 mm | 11 mm |
| Length | 24.7 mm | 24.7 mm | 24.7 mm |
| Output Type | Photodarlington | Photodarlington | Photodarlington |
| Sensing Method | Transmissive, Slotted | Transmissive, Slotted | Transmissive, Slotted |
| Width | 6.35 mm | 6.35 mm | 6.35 mm |
| Brand | ON Semiconductor / Fairchild | ON Semiconductor / Fairchild | ON Semiconductor / Fairchild |
| Number of Channels | 1 Channel | 1 Channel | 1 Channel |
| Pd Power Dissipation | 150 mW | 150 mW | 150 mW |
| Product Type | Optical Switches, Transmissive, Phototransistor Output | Optical Switches, Transmissive, Phototransistor Output | Optical Switches, Transmissive, Phototransistor Output |
| Factory Pack Quantity | 50 | 50 | 50 |
| Subcategory | Optical Switches | Optical Switches | Optical Switches |
| Vr Reverse Voltage | 6 V | 6 V | 6 V |
| Mounting Style | - | Through Hole | - |
| Part # Aliases | - | H21B1_NL | - |