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| PartNumber | OP538FC | OP538FB |
| Description | Phototransistors Photodarlington | Phototransistors Photodarlington |
| Manufacturer | TT Electronics | TT Electronics |
| Product Category | Phototransistors | Phototransistors |
| RoHS | Y | Y |
| Packaging | Bulk | Bulk |
| Brand | Optek / TT Electronics | Optek / TT Electronics |
| Product Type | Phototransistors | Phototransistors |
| Factory Pack Quantity | 100 | 100 |
| Subcategory | Optical Detectors and Sensors | Optical Detectors and Sensors |
| Product | - | Photodarlingtons |
| Package / Case | - | 4.19 mm x 1.85 mm x 3.3 mm |
| Mounting Style | - | Through Hole |
| Peak Wavelength | - | 935 nm |
| Maximum On State Collector Current | - | 20.5 mA |
| Collector Emitter Voltage VCEO Max | - | 30 V |
| Collector Emitter Breakdown Voltage | - | 15 V |
| Collector Emitter Saturation Voltage | - | 1 V |
| Dark Current | - | 225 nA |
| Pd Power Dissipation | - | 100 mW |
| Minimum Operating Temperature | - | - 40 C |
| Maximum Operating Temperature | - | + 100 C |
| Height | - | 3.3 mm |
| Length | - | 4.19 mm |
| Lens Color/Style | - | Black |
| Wavelength | - | 935 nm |
| Width | - | 1.85 mm |
| Half Intensity Angle Degrees | - | 65 deg |