5mm LDR

The 5mm LDR (Light Dependent Resistor) is a passive photo-sensitive component whose resistance changes according to the intensity of light falling on its surface. As light increases, the resistance decreases; in darkness, the resistance rises significantly. Compact in size and highly reliable, this 5mm LDR is widely used in light-sensing, automation, and electronic control applications.

Key Features

• Standard 5mm round photoresistor

• Resistance varies automatically with light intensity

• High sensitivity to visible light

• Fast response and recovery time

• Low power consumption

• Long operational life and stable performance

Technical Specifications

• Type: Light Dependent Resistor (LDR)

• Diameter: 5 mm

• Dark Resistance: ≥ 1 MΩ (approx.)

• Light Resistance: 5–20 kΩ (approx. at 10 lux)

• Operating Voltage: ≤ 150V DC

• Power Consumption: ≤ 100 mW

• Spectral Peak: ~540 nm (visible light)

• Lead Type: Axial leads

• Operating Temperature: -30°C to +70°C

(Values may vary slightly by manufacturer)

Applications

• Automatic street light systems

• Light-activated switches

• Day/night sensors

• Solar garden lights

• Alarm and security systems

• Robotics and DIY electronics projects

• Arduino and microcontroller projects

Advantages

• Simple to use with analog and digital circuits

• Cost-effective light sensing solution

• Ideal for beginners, students, and professionals

• Compatible with breadboards and PCBs