TT Electronics OPB990P51Z
Slotted optical switch with phototransistor output. 3mm slot width, 5V operation, ideal for position and limit sensing.
Product Overview
Description
The TT Electronics OPB990P51Z is a high-performance slotted optical switch featuring an infrared LED emitter and phototransistor detector in a compact housing. With a 3mm slot width, this sensor provides reliable object detection and position sensing for industrial and consumer applications.
The device features a phototransistor output with built-in hysteresis for clean switching and noise immunity. The 5V operation and open-collector output make integration with standard logic circuits straightforward.
Packaged in a robust plastic housing with mounting tabs, the OPB990P51Z is easy to install and provides reliable operation in industrial environments. The sensor is ideal for limit switches, position encoding, and object detection applications.
Product Series
OPB Series
Primary Application
Limit switches
Key Features
- 3mm slot width for object detection
- Infrared LED emitter
- Phototransistor output
- Built-in switching hysteresis
- Open-collector output
- 5V operation
- Compact plastic housing
- Mounting tabs for easy installation
Specifications
| operatingVoltage | 5V |
|---|---|
| outputType | Phototransistor (Open Collector) |
| slotWidth | 3mm |
| gapDepth | 5.3mm |
| collectorCurrent | 20mA max |
| responseTime | 15µs typical |
| operatingTemperature | -25°C to +85°C |
| package | Plastic Housing |
Applications
Limit switches
Electronic system design
Position encoding
Electronic system design
Object detection
Electronic system design
Door interlocks
Electronic system design
Paper sensing
Electronic system design
Vending machines
Electronic system design
FAE Expert Insights
"The OPB990P51Z is a reliable slotted optical sensor that I frequently recommend for industrial position sensing. The 3mm slot is wide enough for most mechanical actuators while maintaining good positional accuracy. What I like about this sensor is the built-in hysteresis - it prevents false triggering from vibration or slow-moving objects. The phototransistor output is easy to interface - just add a pull-up resistor (typically 10kΩ) and connect to your microcontroller or PLC input. For design-in, ensure the object being detected blocks enough light to trigger the sensor. Opaque materials work best; translucent materials may require careful positioning. The 15µs response time is adequate for most position sensing applications. One application tip: keep the sensor clean - dust or debris in the slot can cause false triggering. Consider using a protective cover in dirty environments. The mounting tabs make installation straightforward on panels or PCBs."
Reliable slotted optical sensor for industrial position detection
— David Wang, BeiLuo
Frequently Asked Questions
How do I interface the OPB990 optical sensor with my circuit?
Interfacing the OPB990 slotted optical sensor: (1) LED Drive - Connect the LED anode to 5V through a current-limiting resistor (typically 220Ω for ~15mA). Connect cathode to ground; (2) Phototransistor Output - Connect phototransistor collector to 5V through a pull-up resistor (typically 10kΩ). Connect emitter to ground. Output is taken at collector; (3) Logic Interface - The open-collector output can be connected directly to microcontroller inputs or logic gates. Output is LOW when beam is blocked, HIGH when clear; (4) Sensitivity Adjustment - If needed, adjust LED current or pull-up resistor value to optimize switching point; (5) Filtering - Add a small capacitor (100pF) across the output for noise filtering if needed. The sensor provides clean digital output suitable for direct microcontroller interfacing. For position sensing applications, ensure the mechanical actuator fully blocks the optical beam for reliable switching.
Use 220Ω LED resistor and 10kΩ pull-up for standard 5V operation. Adjust values if different sensitivity is needed. Contact our FAE team for interface design assistance.