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| Part Number | QCK4 |
| Datasheet | QCK4 datasheet |
| Description | SWITCH INTERRUPT DARLINGTON SMD |
| Manufacturer | ON Semiconductor |
| Series | - |
| Part Status | Obsolete |
| Sensing Distance | 0.157" (4mm) |
| Sensing Method | Transmissive |
| Output Configuration | Photodarlington |
| Current - DC Forward (If) (Max) | 50mA |
| Current - Collector (Ic) (Max) | 40mA |
| Voltage - Collector Emitter Breakdown (Max) | 30V |
| Response Time | - |
| Operating Temperature | -40°C ~ 100°C |
| Mounting Type | Surface Mount |
| Package / Case | 4-SMD, Gull Wing |