Triac and SCR output photocouplers are also known as triac and SCR output optocouplers. They are semiconductor devices that combine the functionality of an opto-triac or an opto-SCR with a power triac. They provide electrical isolation between a low voltage input and a high voltage output, whilst being able to switch the high voltage output. This is important in electrical equipment because isolation prevents catastrophic or dangerous faults that can occur in such scenarios where the higher voltage accidentally couples onto the low voltage circuit. This could lead to the destruction of the associated circuits or even electrocution. Such isolation is mandated in government type approval compliance requirements for certain equipment.
These isolating switches contain a low voltage input connected to a simple photo diode circuit. When a small current flows through the photodiode, it generates a beam of light which travels across an electrically insulating barrier or gap and detected by a receiving photodiode. The light beam can be modulated on and off by the input current , typically less than 10mA. This current is known as the LED trigger current. An LED photodiode current is modulated by changing the voltage presented across the diode, crossing the LED Forward Voltage (typically around 0.9-1.4V) as long as the photodiode is presented with voltages that can turn it on and off. This is typically around the 1-1.4V.
The sensing photodiode, in this case, is a photo-triac or a photo-SCR. Triac stands for triode for alternating current and is a device that can conduct current in either direction when it is triggered, or turned on by detecting a light beam on its trigger junction (gate). An SCR is similar to a triac, except that is conducts only in one direction. When used in AC switching applications it is typical to find dual-power SCRs, and a zero crossing detector are used instead of a single triac to allow bidirectional current switching.
These devices are used in applications like high voltage AC switching, gas pumps, washing machines, microwave ovens and water heaters. They are commonly used anywhere where there is a need to protect and electrically isolate two circuits in a switching application.

Market Analysis and Insights: Global Triac and SCR Output Photocouplers Market
The global Triac and SCR Output Photocouplers market was valued at US$ XX in 2020 and will reach US$ XX million by the end of 2027, growing at a CAGR of XX% during 2022-2027.

Global Triac and SCR Output Photocouplers Scope and Market Size
The global Triac and SCR Output Photocouplers market is segmented by company, region (country), by Type, and by Application. Players, stakeholders, and other participants in the global Triac and SCR Output Photocouplers market will be able to gain the upper hand as they use the report as a powerful resource. The segmental analysis focuses on sales, revenue and forecast by region (country), by Type and by Application for the period 2016-2027.

Segment by Type
DIP
SMD
SOIC
SOP
Others

Segment by Application
Commercial
Industrial
Household Electric Appliances
Automotive

The Triac and SCR Output Photocouplers market is analysed and market size information is provided by regions (countries). Segment by Application, the Triac and SCR Output Photocouplers market is segmented into North America, Europe, China, Japan, Southeast Asia, India and Other Regions.

By Company
Isocom Components
ON Semiconductor
Toshiba
Vishay
Central Semiconductor
Everlight Electronics
Lite-On Technology
NTE Electronics
Panasonic
Electric Works
QT-Brightek
Sharp