HP Photo Interrupter - Slotted Optical Switch, Phototransistor Output, 3.18 mm Slot

The HP Photo Interrupter (WG8-5849-000CN) is a high-quality slotted optical switch designed for precise position sensing and object detection. Featuring a transmissive sensing method with an infrared LED emitter and phototransistor output, this component delivers reliable performance in a compact through-hole package. With a slot width of 3.18 mm and fast 15 µs rise/fall times, it is ideal for applications requiring accurate interruption detection.

Advantages

This photo interrupter offers excellent sensitivity and stability, with a minimum on-state collector current of 1.6 mA and an ultra-low off-state leakage of 100 nA. Its wide operating temperature range from -55 to +100 °C ensures dependable operation in harsh environments. The opaque plastic package provides robust protection against ambient light interference.

Suitable for

• Position and limit sensing in printers, copiers, and industrial equipment
• Object detection in automation systems
• Encoder and speed measurement applications
• End-of-travel detection in robotics

Key specifications

• Product Type: Slotted Optical Switch
• Output Type: Phototransistor
• Sensing Method: Transmissive
• Slot Width: 3.18 mm (0.125 inch)
• Max Collector-Emitter Voltage: 30 V
• Max Collector Current: 50 mA
• Typical LED Forward Voltage: 1.5 V @ 20 mA
• Max LED Forward Current: 50 mA
• On-State Collector Current: 1.6 mA (min) @ If=20 mA, Vce=5 V
• Off-State Collector Current: 100 nA (max) @ Vce=30 V
• Rise/Fall Time: 15 µs typical
• Operating Temperature: -55 to +100 °C
• Mounting Type: Through Hole
• Number of Pins: 4
• Package Material: Opaque Plastic

Recommendations

For optimal performance, ensure proper alignment of the slot and use appropriate current-limiting resistors for the LED. This component is a direct replacement for many standard slotted optical switches and is RoHS compliant.