# Phototransistor optocoupler

Canonical URL: https://eloragrid.ai/symbols/phototransistor-optocoupler
Publisher: Elora Grid
Updated: 2026-10-14
Lookup label: OPTO-TR
Drawing use: Schematic
Reference families: Manufacturer

An optical isolation component using an input light emitter and a transistor output on the isolated side.

## What it represents

An optical isolation component using an input light emitter and a transistor output on the isolated side.
On a schematic, identify the emitter current circuit, output collector/emitter and isolation boundary and trace the isolated input status or feedback path. Keep the component tag and signal/reference names consistent across the control drawing, terminal schedule and device documentation.
Optical isolation separates electrical domains; the current-transfer behaviour and output polarity are component-specific.
The preview is an independently drawn educational functional reference. Add the selected component’s actual power pins, terminal numbers, timing or analogue reference details when producing a construction drawing.

## How to read it

- Identify the emitter current circuit, output collector/emitter and isolation boundary.
- Trace the isolated input status or feedback path.

## Information to show or reference

- Label the emitter current circuit, output collector/emitter and isolation boundary.
- Cross-reference the isolated input status or feedback path.
- Add the selected device or circuit documentation revision, power/reference connections and project signal convention.

## Important distinction

Optical isolation separates electrical domains; the current-transfer behaviour and output polarity are component-specific.

## Facts

- Common schematic mnemonic: OPTO-TR — descriptive only; project/device documentation defines reference designations.
- Terminal / interface focus: The emitter current circuit, output collector/emitter and isolation boundary
- Artwork scope: Original educational functional/circuit reference; not a selected product pinout.

## Public references

- [Optocoupler output-family reference](https://www.vishay.com/en/optocouplers/) — Vishay. Public primary manufacturer documentation establishes the component function or circuit/topology relationship. Preview geometry and drafting explanations are independently authored.

## Graphic scope

Independent original educational concept illustration by Elora Grid. Not a certified standards graphic or manufacturer footprint. Unitless; not to scale. Original artwork licence: https://creativecommons.org/licenses/by/4.0/. Publisher material is linked only.