Side-by-side reference

Understand the difference.

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

First referenceCompare with

OC-NOT

IEEE / ANSI

ANSI open-collector inverter

This is an inverter whose output transistor can only pull low. On distinctive-shape schematics the triangle and bubble are retained and an open-collector or open-drain mark, often the underlined diamond, is placed inside or beside the outline. A pull-up resistor or load to a supply completes the circuit.

Drawing use: Schematic
Application: Logic & signals
Reference family: IEEE / ANSI / Manufacturer
Form evidence: Inverter triangle with bubble and open-circuit output marking. 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

The non-inverting open-collector buffer has no output bubble.

Full reference

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.

Full reference

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