# Active low-pass filter

Canonical URL: https://eloragrid.ai/symbols/active-low-pass-filter
Publisher: Elora Grid
Updated: 2026-10-14
Lookup label: LPF
Drawing use: Schematic
Reference families: Manufacturer

Passes the intended lower-frequency signal content while attenuating higher-frequency content through an active filter circuit.

## What it represents

Passes the intended lower-frequency signal content while attenuating higher-frequency content through an active filter circuit.
On a schematic, identify the input/output references, filter order and corner-frequency documentation and trace the filtered measurement path and receiving converter. Keep the component tag and signal/reference names consistent across the control drawing, terminal schedule and device documentation.
The LPF label describes a response class; it does not set cutoff, gain, order or component values.
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 input/output references, filter order and corner-frequency documentation.
- Trace the filtered measurement path and receiving converter.

## Information to show or reference

- Label the input/output references, filter order and corner-frequency documentation.
- Cross-reference the filtered measurement path and receiving converter.
- Add the selected device or circuit documentation revision, power/reference connections and project signal convention.

## Important distinction

The LPF label describes a response class; it does not set cutoff, gain, order or component values.

## Facts

- Common schematic mnemonic: LPF — descriptive only; project/device documentation defines reference designations.
- Terminal / interface focus: The input/output references, filter order and corner-frequency documentation
- Artwork scope: Original educational functional/circuit reference; not a selected product pinout.

## Public references

- [Basic Linear Design, Chapter 8: analogue filter response families](https://www.analog.com/media/en/training-seminars/design-handbooks/Basic-Linear-Design/Chapter8.pdf) — Analog Devices. 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.