Understand the difference.

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

WIRED-AND

IEEE / ANSI

ANSI wired-AND connection

A wired-AND connection is formed by joining open-collector or open-drain outputs to a single line with one pull-up. The line is high only when every output is off, so in positive logic the result is the AND of the individual output states. Some schematics draw a small AND outline around the junction to make the implied function visible.

Drawing use

Schematic

Application

Logic & signals

Reference family

IEEE / ANSI / Manufacturer

Form evidence

Open-collector outputs joined to a common pulled-up line. Distinctive-shape form as used in IEEE/ANSI-style schematics and manufacturer data books. Independent educational drawing; exact standard geometry and compliance are not asserted.

A distinction that matters

A wired-OR uses open-emitter outputs with a pull-down; wired-AND uses open-collector outputs with a pull-up.

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OC-BUF

Symbols

Open-collector buffer

Provides a logic output through a transistor pull-down stage requiring the documented external load or pull-up.

Drawing use

Schematic

Application

Logic & signals

Reference family

Manufacturer

A distinction that matters

An open collector can sink current under its limits; it does not actively drive the high state like a push-pull output.

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