Description
The RPR220 is a reflective photosensor (photoreflector) that combines an infrared emitting diode (IRED) and a high-sensitivity phototransistor in a single compact DIP package. The IRED emits light at a peak wavelength of 940nm, and the phototransistor detects the light reflected back from an object. This reflective sensing principle allows non-contact detection of objects, proximity, and surface characteristics .
The device is optimized for a recommended operating distance of 6mm, with a typical detectable range of 4–15mm depending on the target surface and external circuitry . The phototransistor’s peak sensitivity wavelength is 800nm, and the package includes a visible light filter to minimize interference from ambient lighting . The compact DIP package measures approximately 6.4 × 4.9mm (excluding leads) and is RoHS compliant .
Critical limitations: The RPR220 is a bare sensor, not a self-contained switch. It requires external resistors to limit LED current and to convert the phototransistor’s current output to a voltage. The output is analog (phototransistor collector current varies with reflected light intensity), so a comparator circuit or ADC is required for threshold-based detection. Detection performance depends heavily on target reflectivity—light-colored surfaces reflect more strongly than dark surfaces .
Features
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Integrated IRED + Phototransistor: Compact 4-pin DIP package combines emitter and detector .
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Reflective Sensing Principle: Detects objects via reflected infrared light without contact.
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940nm Emission Wavelength: Standard IR wavelength for reflective sensing .
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Visible Light Filter: Built-in filter reduces interference from ambient lighting .
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Recommended 6mm Operating Distance: Optimized for short-range detection .
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High Sensitivity: Phototransistor provides good response to reflected light .
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Compact DIP Package: Approximately 6.4 × 4.9mm, suitable for space-constrained designs .
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RoHS Compliant: Meets environmental regulations .
Technical Specifications
| Parameter | Specification (Bare RPR-220) |
|---|---|
| Sensor Type | Reflective photosensor (IRED + phototransistor) |
| Package | DIP, 4-pin |
| Recommended Operating Distance | 6mm |
| Detectable Range (with suitable circuit) | Approx. 4–15mm |
| IRED Peak Emission Wavelength | 940nm |
| Phototransistor Peak Sensitivity | 800nm |
| IRED Forward Current (Absolute Max) | 50mA |
| Collector-Emitter Voltage (Max) | 30V |
| Collector Current | 0.08–0.8mA (typical output range) |
| Dark Current (Max) | 0.5µA |
| Operating Temperature | -25°C to +85°C |
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