Optek / TT Electronics OPB88/89-Z Photointerrupters
Optek / TT Electronics OPB88/89-Z Series Photointerrupters consist of transmissive (slotted) photointerrupters that integrate an infrared LED emitter and an NPN silicon phototransistor in a single through-beam package. These slotted optical switches are designed for non-contact detection of motion or object interruption using a mechanical flag, encoder wheel, or similar interrupter element. The OPB88 and OPB89 families share a common optical platform, with variations in lead configuration, mechanical form factor, and aperture options, depending on the specific variant. Both series provide an open-collector phototransistor output requiring an external pull-up resistor for digital interface operation.
The OPB88/89-Z photointerrupters from Optek / TT Electronics feature a typical 3.18mm slot width for standard encoder compatibility and use an infrared emitter with an approximate 890nm peak wavelength. These devices are rated for industrial operation from -40°C to +85°C and are optimized for stable switching performance in motion-sensing and position-detection applications.
Features
- Integrated infrared LED emitter and NPN silicon phototransistor detector
- Transmissive (slotted) optical geometry for interruption-based sensing
- Standard slot width of 3.18mm (family-dependent mechanical consistency)
- Phototransistor output (open collector configuration)
- 30V maximum collector-emitter voltage rating
- 20mA maximum forward LED current
- ~890nm infrared peak wavelength (typical, family dependent)
- Through-hole wire lead construction for mechanical robustness
- Multiple mechanical variants for mounting flexibility
- -40°C to +85°C operating temperature range
Applications
- Rotary and linear optical encoders
- Speed and position sensing systems
- Office automation equipment (printers, copiers)
- Industrial motion detection and limit sensing
- Appliance motor feedback systems
- Non-contact object detection and indexing
Schematic
