The main classification of optocouplers

Photocoupler

Due to the variety and types of optocouplers, there are more than a thousand models in the Optoelectronics DATA Handbook, which can usually be classified as follows:
(1) According to the optical path, it can be divided into an external optical path photocoupler (also known as a photoelectric intermittent detector) and an internal optical path photocoupler. The external optical path photocoupler is further divided into a transmissive type and a reflective type photocoupler.

(2) According to the output form, it can be divided into:
a, photosensitive device output type, including photodiode output type, phototransistor output type, photocell output type, optical thyristor output type.
b, NPN triode output type, including AC input type, DC input type, complementary output type.
c, Darlington triode output type, including AC input type, DC input type.
d, logic gate circuit output type, including gate output type, Schmitt trigger output type, three-state gate output type.
e, low conduction output type (output low level of millivolts).
f, optical switch output type (on-resistance is less than 10Ω).
g, power output type (output such as IGBT/MOSFET).

(3) According to the package form, it can be divided into coaxial type, dual in-line type, TO package type, flat package type, chip package type, and optical fiber transmission type.

(4) According to the transmission signal, it can be divided into digital optocoupler (OC gate output type, totem pole output type and tri-state gate output type) and linear optocoupler (can be divided into low drift type, high linearity) Type, wideband type, single power type, dual power type, etc.).

(5) According to the speed, it can be divided into low-speed photocoupler (phototransistor, photocell and other output type) and high-speed optocoupler (photodiode with signal processing circuit or photosensitive integrated circuit output type).

(6) According to the channel, it can be divided into single channel, dual channel and multi channel optocoupler.

(7) According to the isolation characteristics, it can be divided into common isolation optocouplers (general optical glue potting is less than 5000V, air seal is less than 2000V) and high voltage isolation optocoupler (can be divided into 10kV, 20kV, 30kV, etc.).

(8) According to the working voltage, it can be divided into low power supply voltage type photocoupler (generally 5~15V) and high power supply voltage type photocoupler (generally greater than 30V).