Membrane Switches

Membrane Switches
Low-cost, low-profile switches for high reliability applications

Membrane switches are printed circuits made by printing conductive ink onto thin plastic sheets. They are typically used as momentary on/off contact switches. Membrane switches are used in many different types of user interfaces, such as in microwave button panels or flexible keyboards.

Membrane switches operate like normal switches; by touching two contact points together, the switch is turned “on”. However, unlike some mechanical switches, membrane switches are purely momentary switches. They only stay “on” when depressed. In membrane switches, metal domes or printed shorting pads are usually used to short printed traces together to activate the switch when pressed.

Features and Benefits of Membrane Switches


Design Options

FPC is able to provide and customise the following design features to suit your unique application:



 Non-TactilePolydomeMetal Dome
Actuation Force110 – 450g220 – 680g240 – 550g
Switch Travel0.13 – 0.25mm0.5 – 0.8mm0.35 – 0.60mm
Switch Life>3 million>1 million>1 million
Emboss Height=0.5mm=0.5mm=0.5mm
Emboss Spacing>4mm>4mm>4mm
Contact SurfaceCustomer SpecificationSilver, CarbonSilver, Carbon
  Flexible Printed Circuit: CopperFlexible Printed Circuit: Copper
  PCB: Tin/Lead, Carbon, Nickel or Gold-platedPCB: Tin/Lead, Carbon, Nickel or Gold-plated
   Metal Dome: Nickel or Gold Plated
Contact ConfigurationSPST Normally Open
Maximum Operating Voltage30V DC
Maximum Operating Current100mA
LED Operating Voltage1.9 – 4.0 VDC
LED Operating Current20W – 500W
Contact Bounce<6ms
Closed Loop Resistance<100Ω
Insulation Resistance100kΩ (with crossover design)
 10MΩ (without crossover design)
Operating Temperature-20°C to +70°C (Polydome: 0°C to +50°C)
Storage Temperature-40°C to +80°C (Polydome: -30°C to +60°C)
Operating Humidity90% RH
Storage Humidity90%RH