OPB826S Dual-Channel Slotted Optical Switch, Phototransistor Output
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Prices updated: 13 Oct 2026
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About this product
The OPB826S is a transmissive slotted optical switch with two phototransistor channels in one housing. An infrared emitter and detector face each other across a 2.54 mm slot, so an object passing through the gap interrupts the beam. It is used for position sensing, limit detection and reading rotary encoder discs.
Specifications
- Slot width
- 2.54 mm
- Aperture width
- 1.02 mm
- Collector-emitter voltage (VCEO max)
- 30 V
- Forward current (IF)
- 20 mA
- Power dissipation
- 100 mW
- Wavelength
- 890 nm
- Operating temperature
- -40 °C to +85 °C
- Number of channels
- 2
Frequently asked questions
How do I wire the phototransistor output to a microcontroller?
Connect the emitter to GND and pull the collector up to VCC through a resistor, then read the collector node with a digital input. A value around 10 kΩ is a common starting point. The emitter-side LED must be driven through a series resistor so the current stays at or below 20 mA.
Can it be used to read a rotary encoder?
Yes. The two channels allow a slotted encoder disc to produce two offset signals, which is the basis of quadrature decoding for direction and position.
