Professional IC Distribution & Technical Solutions

The Omron EE-SX1105 is a photomicrosensor (slot-type/transmissive) designed for precise detection applications. Below are its key specifications, descriptions, and features:

Specifications:

• Type: Slot-type (transmissive) photomicrosensor
• Sensing Method: Through-beam
• Light Source: Infrared LED (wavelength: 950 nm)
• Supply Voltage: 5 VDC ±10%
• Current Consumption: 25 mA (max)
• Output Configuration: Phototransistor (NPN open collector)
• Output Current: 50 mA (max)
• Response Time: 0.5 ms (ON), 0.5 ms (OFF)
• Slot Width: 5 mm
• Operating Temperature Range: -25°C to +55°C
• Storage Temperature Range: -30°C to +75°C
• Material: ABS resin housing

Descriptions:

• Compact and lightweight design for space-constrained applications.
• High-speed response suitable for automation and precision detection.
• Infrared light source minimizes interference from ambient light.
• Open-collector output allows easy integration with various circuits.

Features:

• High Sensitivity: Reliable detection of small objects.
• Built-in Amplifier: Simplifies circuit design.
• Durable Construction: Resistant to mechanical stress.
• Snap-in Mounting: Easy installation.
• IP50 Protection: Basic dust resistance.

This sensor is commonly used in printers, copiers, vending machines, and industrial automation systems.

# EE-SX1105 Photomicrosensor: Technical Analysis and Implementation Guide

## Practical Application Scenarios

The OMRON EE-SX1105 is a compact, slot-type photomicrosensor featuring an infrared LED emitter and a phototransistor detector. Its primary function is to detect object presence or motion within its sensing gap, making it ideal for precision applications.

Industrial Automation

In conveyor systems, the EE-SX1105 detects small parts or labels, ensuring proper positioning before robotic assembly. Its fast response time (typically 0.5 ms) prevents bottlenecks in high-speed production lines.

Consumer Electronics

The sensor is widely used in printers and copiers to detect paper jams or media presence. Its small form factor (4.5 mm slot width) allows integration into tight spaces without compromising reliability.

Medical Devices

In infusion pumps or diagnostic equipment, the EE-SX1105 verifies fluid cartridge insertion, preventing operational errors. Its resistance to ambient light interference ensures consistent performance in clinical environments.

## Common Design-Phase Pitfalls and Avoidance Strategies

Misalignment and Optical Interference

Improper alignment between the emitter and detector reduces sensitivity. To mitigate this:

• Use mounting brackets for precise positioning.
• Shield the sensor from external light sources using opaque housings.

Insufficient Current Limiting

Exceeding the LED forward current (50 mA max) shortens lifespan. Implement:

• A series resistor (calculated using \( R = (V_{supply} - V_f) / I_f \)).
• PWM driving to reduce thermal stress.

Electrical Noise Sensitivity

Phototransistor outputs are susceptible to noise in industrial environments. Countermeasures include:

• Adding a 0.1 µF bypass capacitor near the sensor.
• Using shielded cables for long signal runs.

## Key Technical Considerations for Implementation

Optimal Sensing Conditions

• Gap Width: Ensure objects fully interrupt the beam within the 4.5 mm slot.
• Material Transparency: Avoid reflective or IR-absorbent materials that may cause false triggers.

Output Configuration

The phototransistor operates in saturation mode. For digital interfacing:

• Use a pull-up resistor (1–10 kΩ) for logic-level compatibility.
• For analog applications, a current-to-voltage converter may be necessary.

Environmental Durability

While the EE-SX1105 lacks IP-rated sealing, protective coatings can enhance dust and moisture resistance in harsh environments.

By addressing these factors, engineers can maximize the reliability and longevity of the EE-SX1105 in diverse applications.