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| manufacturer | Everlight |
| Manufacturer's name | PT91-21B/F10 |
| Case | Z-Bend |
| Collector emitter voltage at open base [V] | 30 |
| Casing design | black |
| Typ. rise time [µs] | 15 |
| Typ. fall time [µs] | 15 |
| Wavelength of peak sensitivity [nm] | 940 |
| (Max.) collector dark current [nA] | 100 |
| Min. on state collector current [mA] | 1 |