HKD 4x4 Membrane Keypad Matrix with 8-Pin Dupont Flex Cable

The HKD 4x4 Membrane Keypad is a compact, lightweight, and reliable matrix keypad input module designed for DIY electronics, microcontroller projects, embedded systems, and automation applications. Featuring a 4×4 key layout (16 keys total), this keypad provides a simple and efficient human-machine interface for entering commands, passwords, menu navigation, access codes, and control inputs.

Built using membrane switch technology, the keypad offers silent operation, low power consumption, and long service life, making it ideal for both prototyping and permanent installations. The flat, flexible design allows it to be easily mounted onto panels, enclosures, control boxes, or project cases using adhesive or simple mechanical fixing.

The keypad uses a matrix configuration and connects via an 8-pin Dupont connector on a flexible flat cable, allowing easy integration with development boards and microcontrollers such as:

• Arduino
• ESP32 / ESP8266
• Raspberry Pi
• STM32
• PIC / AVR microcontrollers
• Custom embedded control systems

Thanks to the 2.54mm pitch connector, it is fully compatible with standard breadboards, jumper wires, and header pins, making wiring quick and simple for both beginners and professionals.

Designed for durability, the keypad supports over one million press cycles, ensuring long-term reliability in high-use applications such as access control systems, control panels, vending machines, automation interfaces, and educational electronics projects.

The electrical design supports low-voltage, low-current operation, making it safe for direct connection to logic-level electronics and microcontroller GPIO pins without additional interface circuits.

Key Features

• 4×4 matrix keypad (16 keys total)
• Membrane switch technology for silent operation
• 8-pin Dupont connector on flexible flat cable
• 2.54mm pin pitch - breadboard and GPIO compatible
• Ultra-slim, lightweight, and flexible design
• Easy to mount on panels and enclosures
• Long lifespan - 1,000,000 key presses
• Low power consumption
• Ideal for:
  Arduino & ESP projects
  IoT devices
  Access control systems
  Control panels
  Robotics
  Embedded systems
  DIY electronics

Mechanical Specifications

• Dimensions: 76.5mm × 69mm
• Cable Type: Flexible flat cable
• Connector Type: 8-pin Dupont
• Pin Pitch: 2.54mm

Electrical Specifications

• Operating Temperature: Up to 60 C
• Circuit Rating: 35V DC, 100mA, 1W
• Contact Resistance: 10 ~ 500
• Insulation Resistance: 100M @ 100V
• Dielectric Strength: 250V RMS (50-60Hz, 1 minute)
• Electric Shock Jitter: < 5ms
• Lifespan: 1,000,000 operations (tactile type)

Applications

• Password/keypad entry systems
• Access control panels
• Arduino input interfaces
• Smart home controllers
• Robotics control panels
• Vending machines
• Educational electronics kits
• Industrial control panels
• IoT devices

The HKD 4x4 Membrane Keypad is a simple, reliable, and professional input solution for any project requiring compact user input, durability, and easy microcontroller integration, making it a must-have component for makers, students, engineers, and developers building modern electronic systems.

What's in the box
1 x HKD 4x4 Membrane Keypad Matrix with 8-Pin Dupont Flex Cable