Part Number Search

Cross Reference Search

About information presented in this cross reference

The information presented in this cross reference is based on TOSHIBA's selection criteria and should be treated as a suggestion only. Please carefully review the latest versions of all relevant information on the TOSHIBA products, including without limitation data sheets and validate all operating parameters of the TOSHIBA products to ensure that the suggested TOSHIBA products are truly compatible with your design and application.
Please note that this cross reference is based on TOSHIBA's estimate of compatibility with other manufacturers' products, based on other manufacturers' published data, at the time the data was collected.
TOSHIBA is not responsible for any incorrect or incomplete information. Information is subject to change at any time without notice.

Keyword Search

Parametric Search

Stock Check & Purchase

Select Product Categories

Select Application

Find everything you need for your next product design. Simply select an application and click through to the block diagram to discover our semiconductor solutions.

New Products / News

Innovation Centre

At the Toshiba Innovation Centre we constantly strive to inspire you with our technologies and solutions. Discover how to place us at the heart of your innovations.

Chapter V : Optical Semiconductors : What Is a Photocoupler?

Photocoupler:
A photocoupler is a device incorporating a light-emitting diode (LED) and a photodetector in one package. Unlike other optical devices, light is not emitted outside the package. The external appearance is similar to that of non-optical semiconductor devices. Although a photocoupler is an optical device, it does not handle light, but handles electrical signals.

Examples of a photocoupler’s operation:

(1)The LED turns on (0 ⇒ 1).
(2)The LED light enters the phototransistor.
(3)The phototransistor turns on.
(4)Output voltage changes 0 ⇒ 1.

(1)The LED turns off (1 ⇒ 0).
(2)The LED stops light emission to the phototransistor.
(3)The phototransistor turns off.
(4)Output voltage changes 1 ⇒ 0.

*The cutaway image on the right shows a transistor-output photocoupler of the transmissive type in a double-mold structure.

What Is a Photocoupler?

Chapter V : Optical Semiconductors

Related information

A new window will open