Membrane Switch Introduction

We have all used a membrane switch but may not be aware of it. When using a bank automatic teller-machine, microwave oven or gasoline pump keypad you are entering your selection on a membrane switch. This low voltage switching device has replaced conventional mechanical push button assemblies in all types of applications: industrial, medical, appliance, automotive, gaming, banking, training, computers, toys, point of sale, public information, and aviation.

Advantages

Some advantages to using a Membrane Switch over other types of switch devices.

  • Low Cost
  • Thin and flexible
  • Logic level signals
  • Multiplexing
  • Moisture Resistance
  • Versatile
  • Size
  • Switch location
  • Actuation force and snap
  • Back-lighting
  • Durable
  • Decorative
  • Product Identification

Prototypes

Discuss your application with our technical staff as early in the design stage as possible. This will help in specifying a membrane switch that will best satisfy your requirements, while at the same time "designing for manufacturability" to help keep the unit cost as low as possible. The following factors contribute to a successful prototype run:

  1. Identify mechanical, electrical and environmental conditions. Avoid locking-in the design early - get technical help from PadTech
  2. Select the construction that best fits the application - see quotation checklist and design guide for more detailed information
    • Tactile or non-tactile keypad
    • Number of keys - and electrical schematic (pinout)
    • Windows and textures
    • Embossing
    • Tail exit, location and length
    • Connector
    • Backlighting, LEDs
    • Shielding
    • Elastomer or Plastic keys
    • Metal or rigid plastic rigid backing
    • Bezel
    • Printed Circuit Board and value added components
  3. Leave at the minimum .100" between edge of keys and edge of part (.25" is better)
  4. .125" between edge of keys is best (or greater).
  5. Try not to design the tail exit directly under a switch - this will increase cost.
  6. Allow as much time for prototype manufacturing to avoid rush and expediting costs.
  7. Provide as much graphic and mechanical information as possible.
  8. Allow us to specify electrical pinout - to simplify the design and shorten design time.

Go to: Membrane Switch Checklist & RFQ
Go to: Design guide

  © 2004 PadTech Industries Ltd.