LCR-0203 Datasheet PDF – Analog Linear Optocoupler

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LCR-0203 Datasheet PDF learn more.

Part number: LCR0203

Functions: Analog Linear Optocoupler

Package information: Lead wire 4 Pin type

Manufacturer: ETC

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LCR-0203 datasheet pdf

Description

The LCR-0203 is an analog linear optocoupler that uses a CdS photoresistor and LED to achieve current-controlled variable resistance with non-polar output, typically packaged in an aluminum alloy columnar enclosure. It features wide dynamic resistance range, low distortion coupling, excellent isolation, and compatibility with both AC and DC circuits. This device is commonly used in audio control, signal isolation, and industrial automation systems requiring smooth analog resistance control.

Features

  • Analog linear resistance control via LED input current
  • Pure resistive output with non-polarity characteristics
  • Wide resistance range from low “on” to high “off” state
  • High isolation between input and output
  • Low distortion signal coupling
  • Suitable for both AC and DC applications
  • Compact aluminum alloy columnar package
  • Fast response time below 2.5ms

Pinout

optocoupler LCR-0203 pinout

Absolute Maximum Ratings (Tc = 25 °C)

Parameter Symbol Value Unit
Input Current IF 40 mA
Input Voltage VF 2.5 V
Output Resistance (Light) RL 50-1000 Ω
Output Resistance (Dark) RD 1-10 MΩ
Isolation Voltage VISO 2500 VRMS
Output Voltage VOUT 50 V
Power Dissipation PD 100 mW
Operating Temperature TOP -30 to +70 °C

Design Notes

  • LED drive current directly controls output resistance; ensure stable current source design
  • CdS response time is slower than semiconductor devices, consider in high-speed circuits
  • Avoid excessive ambient light exposure for consistent performance
  • Isolation makes it ideal for noise-sensitive analog signal paths
  • Suitable for low-frequency analog signal control applications

Typical Circuit Usage

  • Audio attenuator and volume control circuits
  • Galvanic isolation in analog signal paths
  • Light-controlled dimming systems
  • Motor speed control via analog resistance variation

How to Choose This Part

  • Select when smooth analog resistance control is required
  • Ideal for isolation without introducing polarity constraints
  • Suitable for low-frequency or DC signal applications
  • Choose for audio or signal conditioning circuits requiring low distortion
  • Best fit for compact designs needing simple interface circuitry

Applications

  • Audio protection and level control systems
  • Signal isolation in communication equipment
  • Lighting control and dimming applications
  • Communication transmission and automatic control

Alternative / Equivalent Products

  • VTL5C3
  • NSL-32SR2
  • NSL-32SR3
  • H11F1

[ … ]

LCR-0203 PDF File

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