Understand the difference.

Compare the meaning, drawing context and source references of two entries. A similar graphic or shared abbreviation does not establish equivalence.

SCR

IEEE / ANSI

ANSI/IEEE silicon-controlled rectifier symbol

The SCR form identifies a thyristor power path with a separate gate trigger connection. Following anode, cathode and gate independently explains the difference between the controlled power circuit and its drive circuit.

Drawing use

Schematic

Application

Electronic components

Reference family

IEEE / ANSI / Manufacturer

Form evidence

Autodesk IEEE-oriented Semiconductor Components functional form. Autodesk explicitly publishes this block under IEEE Symbol Preview. The counterpart is the matching functional concept; no equivalence of every detailed standard graphic is asserted.

A distinction that matters

An SCR is different from a bidirectional TRIAC, and a gate lead is not an additional load terminal.

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SCR

Symbols

Silicon-controlled rectifier

An SCR is a thyristor with a gate-controlled triggering function in its documented circuit. Anode, cathode and gate connections must be distinguished to understand the control path.

Drawing use

Schematic

Application

Control circuits

Reference family

IEC / Manufacturer

A distinction that matters

An SCR is not the same as a bidirectional TRIAC.

Full referenceAdd to legend

Original educational previews. Follow the source references on each full entry for the appropriate standard or selected product.