| Pin | Description |
| 1 | LED (Anode) |
| 2 | LED (Cathode) |
| 3 | Phototransistor (Emitter) |
| 4 | Phototransistor (Collector) |
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| Pin | Description |
| 1 | LED (Anode) |
| 2 | LED (Cathode) |
| 3 | Phototransistor (Emitter) |
| 4 | Phototransistor (Collector) |
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