Würth Elektronik: Photocoupler - Würth Elektronik -Macnica

Product Summary

The Würth Elektronik WL-OCxx series is a photocoupler product group that safely transmits signals between different potentials as an isolated interface used in industrial equipment, power supply circuits, motor control, etc. The series consists of the following three types so that you can select the product that best suits your application.

■ WL-OCPT (phototransistor type)
This is a general-purpose type suitable for isolated power supply feedback and digital signal isolation. It features medium-speed response and low V _CE(sat), making it suitable for isolating microcomputer input signals.

　■ WL-OCDA (Darlington type)
It operates at a high current transfer ratio (CTR) and low input current, enabling applications such as driving large current loads and isolating weak sensor outputs.

　■ WL-OCTR (triac type)
This model has high insulation resistance and is designed to directly control AC loads such as 100V/200V AC. It is ideal for driving heaters and AC motors.

The strength of the WL-OCxx series is that these three types cover a wide range of applications, from "digital signal isolation" to "low-level light detection" and "AC load control."

Product features

The WL-OCxx series is a photocoupler series designed to allow you to select the optimum isolation method for your application. The lineup includes three output methods: phototransistor, Darlington, and triac, and covers a wide range of applications from signal isolation to AC load control.

The features of each series are as follows:

■ Features of WL-OCPT (phototransistor type)
- Phototransistor output method
- Medium speed response
・Low V _CE(sat) (saturation voltage)
・General-purpose type suitable for power supply circuits, microcomputer inputs, and digital signal isolation
- Highly versatile and applicable to a variety of applications

■ Features of WL-OCDA (Darlington type)
- Darlington output method
- Extremely high CTR (current transfer ratio)
・Reliable operation even with weak LED current
・Slow response speed
・ V _CE(sat) High
- For applications such as driving large current loads and detecting weak light

■ Features of WL-OCTR (triac type)
・Common features
- Triac output method
- Direct control of AC100V/200V AC loads
- Supports driving heaters and AC motors
・Zero Cross (zero cross type)
- Switching only when AC voltage is near 0V (zero crossing point)
- Low inrush current
- Low noise (EMI)
- Ideal for turning on/off lamps, heaters, etc.
- Phase control is not possible
・Random Phase (Random Phase Type)
- Instant switching when the input LED lights up
- Phase control is possible (dimming, motor speed control, etc.)
- Fast response
- Switching noise may increase

Series feature comparison

item	WL‑OCPT	WL‑OCDA	WL‑OCTR
Output element	phototransistor	Darlington	Triac
Main features	Medium response speed and low V _CE(sat)	High CTR/high sensitivity/low speed	AC load control possible (Zero Cross / Random Phase)
Special use	Power supply circuit, digital signal isolation	High current load drive, weak light detection	AC ON/OFF, dimming, speed control

Product lineup

WL-OCPT (phototransistor type)
*You will be redirected to the manufacturer's page (English).

WL-OCDA (Darlington type)
*You will be redirected to the manufacturer's page (English).

WL-OCTR (triac type)
*You will be redirected to the manufacturer's page (English).

Target application

The WL-OCxx series is used in a variety of industrial, power supply, and motor control applications that require isolation. Typical application examples are listed below.

Power supply circuit feedback circuit isolation

High voltage motor circuit insulation

Motor phase control isolation

Industrial Equipment Control Isolation

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