A miniature rotary encoder is a small incremental encoder that turns shaft rotation into digital pulses for volume, menu and setting controls, in a body small enough for handheld and wearable designs. Swiclick’s smallest is 4.8 x 3.8 mm, an SMD rotary encoder for boards where a standard 11 or 12 mm encoder will not fit.

An incremental rotary encoder reports how far and which way a shaft turns, not its absolute position, using two channels that pulse out of phase. That is enough for the jobs it usually does: turning up a volume, stepping through a menu, trimming a setting. What changes across the range is size, resolution and feel. Swiclick’s GE series runs from the 4.8 x 3.8 mm SMD part, through the 11 mm EC11-standard and 12 mm EC12 sizes, to a 16 mm body, plus a panel-mount version. Resolution covers 12 to 36 pulses per revolution, with detent options of 0, 18, 20 or 30, and shafts in D-cut, flat, plum or knurled forms. The right one is set by how much board space you have, how fine the steps need to feel, and whether it mounts on the board or through a panel.

Size comparison of a 4.8 x 3.8 mm SMD rotary encoder against a standard 11–12 mm panel encoder.

What “miniature” buys you

The 4.8 x 3.8 mm size is the point of difference. A standard 11 or 12 mm encoder does not fit a smartwatch, a hearing aid, or a dense instrument board; a part this small does, and it mounts as SMD straight onto the PCB. Where a design has been built around a larger ALPS, Bourns or CUI encoder and now has to shrink, the size is what opens the layout back up.

Where miniature rotary encoders are used: wearables, hearing aids and robot joints.

Choosing PPR, detents and shaft

Three choices set how the encoder reads and feels:

Incremental rotary encoder construction: code wheel, A/B quadrature channels and shaft.
  • Resolution (PPR). 12 to 36 pulses per revolution. More pulses give finer steps per turn; fewer give coarser, faster stepping.
  • Detents. 0 for a smooth free-spinning control, or 18, 20 or 30 clicks per turn for a defined step you can feel.
  • Shaft and switch. D-cut, flat, plum or knurled shafts, with or without an integrated push switch for press-to-select, and SMD, through-hole or panel mounting.

Cross-referencing an ALPS, Bourns or CUI encoder

Second-sourcing an encoder works like any switch cross-reference: match the electrical and mechanical interface, then confirm on samples. Line up pulses per revolution, detent count, shaft form and length, mounting style, and whether a push switch is present, against the part you are replacing. Swiclick is an independent alternative, not affiliated with those brands; send the encoder you are replacing and our engineers will identify the closest GE-series match and share its specifications.

FAQ

What is the smallest rotary encoder Swiclick makes?

The GE series starts at 4.8 x 3.8 mm, an SMD incremental encoder for wearables and dense boards where a standard 11 or 12 mm part will not fit.

Can the encoder include a push switch?

Yes, on the models that offer it, for press-to-select in the same control. Whether a specific size includes the switch is confirmed per part.

Is it incremental or absolute?

The GE series is incremental: it reports change in position, not absolute angle, which fits volume, menu and setting controls.

Talk to an engineer

Tell us the encoder you are cross-referencing or the resolution, detent and shaft you need, and our engineers will identify the closest GE-series match and share its specifications. Free samples ship 1 to 50 for validation before volume.

Written by Eric Chen, Application Engineer, Swiclick.