Understand the difference.

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

&

IEC

IEC NAND gate (rectangular form)

In the IEC rectangular system there is no separate NAND qualifier. The element is an & box whose output carries a logic negation circle, or in data-book practice a polarity triangle marking the output as active-low. The output therefore stands at its external 0 state only when all inputs are active.

Drawing use

Schematic

Application

Logic & signals

Reference family

IEC / Manufacturer

Form evidence

& rectangular element with output negation circle. Qualifying-symbol and dependency conventions as explained in TI's public overview of IEEE Std 91-1984, which incorporates IEC 617-12 work. Independent educational drawing; not certified IEC geometry or an IEC database identifier. The counterpart is the matching functional concept; no equivalence of every detailed standard graphic is asserted.

A distinction that matters

An & box with a negated input rather than a negated output is a different function (an inhibit-type AND), not a NAND.

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NAND

Symbols

NAND gate

A logic gate that inverts the result of an AND operation.

Drawing use

Schematic

Application

Logic & signals

Reference family

Manufacturer

A distinction that matters

The inversion bubble concerns logical polarity; it does not identify a normally-closed physical contact.

Full referenceAdd to legend

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