What is the difference between SOP optocoupler and SMT optocoupler

There is actually a certain conceptual overlap and misunderstanding between SOP optocouplers and SMT optocouplers. Firstly, we need to clarify several concepts:
SOP optocoupler
Definition: SOP optocoupler, also known as Small Outline Package optocoupler, is a type of optocoupler that adopts SOP packaging form. SOP packaging is a miniaturized form of plastic packaging with a smaller outline size.
Features: SOP optocouplers have high isolation voltage, high speed, low power consumption, and high reliability. Its miniaturized design makes it very suitable for electronic devices with limited space, such as portable devices, high-density circuit boards, etc.
Application: SOP optocouplers are widely used in various fields such as power control, communication, audio, and video, to achieve optoelectronic isolation and signal transmission in circuits.
SMT optocoupler
Definition: SMT optocoupler actually refers to a optocoupler packaged using surface mount technology (SMT). SMT is a packaging technology that directly attaches electronic components to the surface of a printed circuit board (PCB) and performs soldering.
Features: The characteristic of SMT optocouplers lies in their packaging form, which uses SMT technology for packaging. This packaging technology enables optocouplers to be more tightly mounted on circuit boards, improving the integration and production efficiency of circuit boards. Meanwhile, SMT optocouplers also inherit the optoelectronic isolation and signal transmission characteristics of optocouplers themselves.
Application: SMT optocouplers are also widely used in various electronic devices, especially in situations that require high-density integration and automated production.
The difference between SOP optocoupler and SMT optocoupler
The main difference between SOP optocouplers and SMT optocouplers lies in their different descriptive angles. SOP optocouplers are described from the perspective of packaging form, while SMT optocouplers are described from the perspective of packaging technology or installation method. In fact, SOP optocouplers can be packaged and installed using SMT technology.
Practical application: In practical applications, we may encounter optocouplers that use both SOP packaging and SMT technology, which are both SOP optocouplers and SMT optocouplers. Therefore, when describing an optocoupler, we usually consider both its packaging form and packaging technology.