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Membrane switch guides

Membrane switch guides and design resources.

Practical membrane switch guides written for the engineers and buyers who have to specify a keypad. Each one covers a single decision, from how the layers stack up to materials, tactile feel, backlighting, connectors and what to send for a quote.

ConstructionMaterialsTactile feelBacklightingConnectorsDesign
Glossary

Membrane switch glossary.

The terms that come up most across our membrane switch guides, each in one plain sentence.

Graphic overlay
The printed top film that carries your artwork and keys, in hardcoated polyester or polycarbonate, around 0.15 mm (0.006 in) thick.
Spacer
The die-cut adhesive layer between the two printed circuits that sets the contact gap and keeps the switch open until a key is pressed.
Metal dome
A stainless steel snap disc, about 2 to 16 mm across, that collapses under roughly 200 to 400 gf to give a crisp tactile click.
Dome retainer
A patterned adhesive layer that holds each metal dome centred over its contact during assembly and use.
Tail
The printed or flexible extension that exits the switch and ends in the connector that mates with your board.
ZIF connector
A zero insertion force socket that clamps a bare flexible tail, used as one termination option alongside pin headers and crimps.
Light guide film
A thin film fed by side-firing LEDs that spreads light evenly across the key face, adding only a fraction of a millimetre.
Dead-front
An overlay treatment where hidden legends or icons stay invisible until a backlight behind them is switched on.
Printed silver circuit
Screen-printed silver conductors with a carbon overprint on the contacts, laid on PET film about 0.125 mm per layer.
Flexible printed circuit
An etched copper circuit on flexible film used in place of printed silver when fine traces or higher current are needed.
Pantone
The colour matching system we print to so your overlay arrives at the exact shade you approve on the proof.

Each entry links through to a fuller treatment in our membrane switch guides.

Where to begin

Start here by topic.

New to membrane switches? Pick the theme that matches your question and jump straight to the right guide.

The basics

How a membrane switch works and where it fits next to other panel controls - what is a membrane switch.

Materials and build

The overlay, circuit, spacer and adhesive layers and the films they use - layers and construction.

Feel and backlight

Choosing a tactile click or a flat surface and lighting the keys - tactile vs non-tactile.

Connectors and design

Tails, terminations and what to put on your drawing - connectors and tail options.

Membrane switch FAQ

Common membrane switch questions.

Short answers to the questions engineers and buyers ask most before they specify a keypad.

What is a membrane switch?

A membrane switch is a thin, sealed control panel that carries the graphics, the keys and the circuit in one bonded laminate. A printed overlay shows your artwork, a printed silver circuit registers each press, and a spacer sets the contact gap. It can be flat or have a tactile click, and it bonds straight onto your product through one tail.

What is the difference between tactile and non-tactile?

A tactile membrane switch uses a stainless metal dome or an embossed poly dome to give a felt, repeatable click, usually around 200 to 400 gf. A non-tactile switch is flat with no raised feel, so it is lower profile, quieter and easy to wipe clean. The right choice depends on how often the keys are pressed and how much feedback the operator needs.

Which overlay material should I use, PET or polycarbonate?

PET polyester is the usual choice for keys pressed often because it holds up well to flexing and embossing over a long life. Polycarbonate gives a hard, clear surface that suits printed windows and larger graphic panels. We can advise on the surface finish too, from matte and gloss to anti-glare and hard-coat anti-scratch.

Can a membrane switch be backlit?

Yes. We backlight keys and legends with surface mount LEDs for spot lighting, or with light guide film for even illumination across the whole key face. Backlighting can be single color or multi color, and we can add a dead-front overlay so hidden legends only appear when lit.

How do I get a membrane switch quote?

Send your drawing or a sample with the panel size in mm or inch, the key layout, the tactile feel you want, any backlight or window needs, the tail and connector, and your quantity. We reply with price, lead time and a sample plan. Prototype lead time is commonly two to three weeks, then production runs to your volume.

Ready to specify your panel?

Send your drawing, sizing and click feel. We will recommend the right membrane switch build and quote it as an OEM / ODM project.