Understand the difference.

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

1

IEC

IEC buffer element (rectangular form)

A rectangular element with the qualifier 1 and no negation simply repeats its input. It is used to show isolation between logic stages, a fan-out point, or an interface where a physical buffer device exists. When the buffer has greater than normal drive capability, an amplifier triangle pointing in the signal direction is added inside the outline.

Drawing use

Schematic

Application

Logic & signals

Reference family

IEC / Manufacturer

Form evidence

Single-input element marked 1 without negation. 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

The same box with output negation is an inverter; the amplifier triangle inside marks increased drive capability.

Full referenceAdd to legend

BUF

Symbols

Non-inverting logic buffer

Transfers a digital state through a non-inverting logic output stage.

Drawing use

Schematic

Application

Logic & signals

Reference family

Manufacturer

A distinction that matters

A buffer can provide drive capability without inversion; it is not a galvanic isolation barrier.

Full referenceAdd to legend

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