4×3 Matrix 12-Key Membrane Switch Keypad with Ribbon Cable

4×3 Matrix 12-Key Membrane Switch Keypad with Ribbon Cable is a compact, flexible telephone-style matrix keypad featuring 12 tactile keys arranged in 4 rows and 3 columns (digits 0 through 9, *, and #). Terminated with a standard 7-pin 2.54mm pitch DuPont connector and equipped with an adhesive peel-and-stick backing, it provides an intuitive, reliable user input interface for access control, automated dialing, and menu navigation systems.

Key Features:

• Telephone-Style 12-Key Matrix: Standard layout includes digits 0-9, asterisk (*), and hash (#).
• Matrix Pin Economy: 12 independent switches require only 7 microcontroller I/O pins (4 rows and 3 columns).
• Tactile Click Response: Internal metal domes provide clear tactile feedback with audible click confirmation.
• Adhesive Backing: Industrial adhesive backing enables direct flush mounting on plastic enclosures and wall plates.
• Waterproof and Dustproof Overlay: Sealed polyester surface protects underlying traces from dirt and liquid splashes.
• Universal Library Compatibility: Directly supported by standard Arduino Keypad library without modification.

Technical Specifications:

• Maximum Circuit Rating: 35V DC, 100 mA
• Contact Resistance: 10 Ω to 500 Ω
• Insulation Resistance: 100 MΩ at 100V DC
• Contact Bounce Duration: < 5 ms
• Switch Lifespan: Over 1,000,000 cycles per button
• Operating Temperature: -20°C to +40°C

Mechanical Specifications:

• Keypad Structure: Multi-layer sealed PET membrane with metal dome contacts
• Connector Type: 7-Pin 2.54mm pitch female DuPont header connector
• Tail Cable Length: Approximately 85 mm
• Weight: Approximately 7 grams

Dimensions:

• Keypad Width: 51.0 mm
• Keypad Height: 69.0 mm
• Thickness: 0.8 mm

Pinout and Wiring:

• Pins 1 to 4: Rows 1, 2, 3, 4
• Pins 5 to 7: Columns 1, 2, 3

Datasheet Reference:

• Datasheet Reference: Refer to standard telephone matrix keypad scanning documentation and open-source Keypad library tutorials.

Commonly Used in:

• Digital security locks and door entry access panels
• Vending machines and automated ticketing kiosks
• DTMF phone dialers and intercom consoles
• Industrial timer and temperature setpoint controllers

Applications:

• Numeric PIN code entry for electronic doors and lockers
• Menu selection on 16×2 and 20×4 character LCD screens
• Remote robot control command entry
• Educational microcontroller lab experiments

Equivalent Models:

• 4×4 Matrix 16-Key Membrane Keypad
• 4×3 Matrix Rigid PCB Keypad Module
• TTP224 4-Key Capacitive Touch Module

Package Includes:

• 1 × 4×3 Matrix 12-Key Membrane Switch Keypad with Ribbon Cable