| PartNumber | OP555A | OP555B | OP555D |
| Description | Phototransistors Photo Transistor | Phototransistors Photo Transistor | Phototransistors Photo Transistor |
| Manufacturer | TT Electronics | TT Electronics | TT Electronics |
| Product Category | Phototransistors | Phototransistors | Phototransistors |
| RoHS | Y | Y | Y |
| Product | Phototransistors | Phototransistors | - |
| Package / Case | Sidelooker | Sidelooker | - |
| Mounting Style | Through Hole | Through Hole | - |
| Collector Emitter Voltage VCEO Max | 30 V | 30 V | - |
| Collector Emitter Breakdown Voltage | 30 V | 30 V | - |
| Collector Emitter Saturation Voltage | 0.4 V | 0.4 V | - |
| Dark Current | 100 nA | 100 nA | - |
| Pd Power Dissipation | 100 mW | 100 mW | - |
| Minimum Operating Temperature | - 40 C | - 40 C | - |
| Maximum Operating Temperature | + 100 C | + 100 C | - |
| Packaging | Bulk | Bulk | Bulk |
| Type | NPN Silicon Phototransistor | NPN Silicon Phototransistor | - |
| Wavelength | 935 nm | 935 nm | - |
| Brand | Optek / TT Electronics | Optek / TT Electronics | Optek / TT Electronics |
| Product Type | Phototransistors | Phototransistors | Phototransistors |
| Factory Pack Quantity | 500 | 500 | 100 |
| Subcategory | Optical Detectors and Sensors | Optical Detectors and Sensors | Optical Detectors and Sensors |
| Peak Wavelength | - | 935 nm | - |
| Maximum On State Collector Current | - | 4.7 mA | - |
| Height | - | 6.22 mm | - |
| Length | - | 4.57 mm | - |
| Lens Color/Style | - | Blue | - |
| Width | - | 2.67 mm | - |
| Half Intensity Angle Degrees | - | 28 deg | - |