TRIAC
TRIAC
A TRIAC is a bidirectional thyristor used for a documented AC switching or control function.
Schematic
Symbols · OPTO-TRIAC
Phototriac optocoupler
An optical isolation device whose output is a light-triggered triac-type switching element.
Schematic · OPTO-TRIAC
What it represents
An optical isolation device whose output is a light-triggered triac-type switching element.
On a schematic, identify the LED input, output main terminals and any zero-cross feature and trace the external AC switching or triggering circuit. Keep the component tag and signal/reference names consistent across the control drawing, terminal schedule and device documentation.
A phototriac driver is not necessarily the load-carrying power TRIAC; zero-cross and random-phase variants need the selected manual.
The preview is an independently drawn educational functional reference. Add the selected component’s actual power pins, terminal numbers, timing or analogue reference details when producing a construction drawing.
How to read it
- Identify the LED input, output main terminals and any zero-cross feature.
- Trace the external AC switching or triggering circuit.
Information to show or reference
- Label the LED input, output main terminals and any zero-cross feature.
- Cross-reference the external AC switching or triggering circuit.
- Add the selected device or circuit documentation revision, power/reference connections and project signal convention.
A distinction that matters
A phototriac driver is not necessarily the load-carrying power TRIAC; zero-cross and random-phase variants need the selected manual.
Sources you can follow
These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.
Optocoupler output-family reference
Public primary manufacturer documentation establishes the component function or circuit/topology relationship. Preview geometry and drafting explanations are independently authored.
About this graphic
This illustration was authored independently by Elora Grid to explain the concept. It is not reproduced from a customer drawing, an official standard graphic or a manufacturer CAD file. Its correspondence to an exact IEC or IEEE symbol identifier has not been certified.
SVG and DXF downloads contain this original artwork. DXF uses unscaled drawing units; a GA envelope supplies no product dimensions, clearances or fabrication information. Original artwork is available under CC BY 4.0. Third-party references retain their own terms.
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