Optocoupler relays can be classified according to their different characteristics and applications. The following are some common classification methods:

1. Classified by output type:

-AC output optocoupler relay: The output is an AC signal, suitable for isolation and control of AC circuits.

-DC output optocoupler relay: The output is a DC electrical signal, suitable for isolation and control of DC circuits.

2. Classified by input-output isolation performance:

-High isolation optocoupler relay: With high input-output isolation performance, it is suitable for applications that require high isolation, such as medical equipment.

-Low isolation optocoupler relay: With relatively low isolation performance, it is suitable for some general control and signal transmission scenarios.

3. Classified by transmission rate:

-High speed optocoupler relay: With a fast signal transmission rate, it is suitable for applications that require high-speed switching, such as communication equipment.

-Standard speed optocoupler relay: The transmission rate is average, suitable for general control and signal transmission needs.

4. Classified by working principle:

-Ordinary optocoupler relay: achieves isolation and control of input and output through the principle of photoelectric coupling.

-Photo sensitive optocoupler relay: using photosensitive components such as photoresistors or phototransistors to achieve sensitive detection of input optical signals.

5. Classified by packaging form:

-DIP packaged optocoupler relay: using dual in-line packaging, suitable for installation on general circuit boards.

-SMD packaged optocoupler relay: using surface mount packaging, suitable for compact circuit board design.

6. Classified by application field:

-Optocoupler relay in the field of communication: suitable for isolation and signal control in communication equipment.

-Industrial automation optocoupler relay: used for isolation and signal transmission in industrial control systems.

-Optocoupler relay in the medical field: suitable for signal isolation and control of medical equipment.

These are some common classification methods for optocoupler relays, and different classifications are applicable to different application scenarios and requirements.