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| PartNumber | PT91-21B/TR9 | PT91-21B/TR7 | PT91-21B |
| Description | Phototransistors IR Phototransistor | Phototransistors IR Phototransistor | Phototransistors IR Phototransistor |
| Manufacturer | Everlight | Everlight | Everlight |
| Product Category | Phototransistors | Phototransistors | Phototransistors |
| RoHS | Y | Y | Y |
| Product | Phototransistors | Phototransistors | Phototransistors |
| Maximum On State Collector Current | 20 mA | 20 mA | 20 mA |
| Packaging | Reel | Reel | - |
| Brand | Everlight | Everlight | Everlight |
| Moisture Sensitive | Yes | Yes | - |
| Product Type | Phototransistors | Phototransistors | Phototransistors |
| Factory Pack Quantity | 1000 | 1000 | 1000 |
| Subcategory | Optical Detectors and Sensors | Optical Detectors and Sensors | Optical Detectors and Sensors |
| Package / Case | - | Gull Wing SMD/SMT | - |
| Mounting Style | - | SMD/SMT | - |
| Peak Wavelength | - | 940 nm | - |
| Collector Emitter Voltage VCEO Max | - | 30 V | - |
| Collector Emitter Breakdown Voltage | - | 30 V | - |
| Collector Emitter Saturation Voltage | - | 0.4 V | - |
| Dark Current | - | 100 nA | - |
| Rise Time | - | 15 us | - |
| Fall Time | - | 15 us | - |
| Pd Power Dissipation | - | 75 mW | - |
| Minimum Operating Temperature | - | - 25 C | - |
| Maximum Operating Temperature | - | + 85 C | - |
| Height | - | 2.7 mm | - |
| Length | - | 2.5 mm | - |
| Lens Color/Style | - | Black | - |
| Type | - | 1.9 mm Round Subminiature Gull Wing Lead Phototransistor | - |
| Wavelength | - | 940 nm | - |
| Width | - | 2 mm | - |
| Half Intensity Angle Degrees | - | 35 deg | - |