DC 12V 1x4 Key Matrix Membrane Switch Keypad

Add simple multi-button user input to your electronics projects with the DC 12V 1x4 Key Matrix Membrane Switch Keypad. Featuring a sleek, ultra-thin adhesive-backed design, this 4-button single-row keypad provides tactile user feedback for microcontrollers. With a flexible ribbon cable terminated in a standard 0.1" (2.54mm) pitch 5-pin female header, it connects effortlessly to Arduino, ESP32, Raspberry Pi, and PIC control boards. Operating at up to DC 12V 35mA, it is the perfect solution for security PIN panels, menu navigation controls, and DIY custom interfaces.

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Tags 1x4 Membrane Keypad 1x4 Matrix Keyboard 4 Key Matrix Switch DC 12V Keypad Arduino Membrane Keypad ESP32 4 Button Keypad 1x4 Push Button Strip Microcontroller Keypad

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Product Details :

The DC 12V 1x4 Key Matrix Membrane Switch Keypad is a lightweight, ultra-thin user input interface designed for microcontroller-based projects requiring discrete button inputs. Arranged in a single horizontal or vertical line of 4 keys (labeled 1, 2, 3, 4 or K1, K2, K3, K4 depending on the production batch), this module provides a clean and compact alternative to bulky panel-mount mechanical switches.

Built with flexible, multi-layer printed circuit traces beneath a durable plastic overlay, each button provides tactile "click" feedback when pressed. The back of the keypad features a peel-and-stick 3M adhesive backing, allowing you to mount it flat against enclosures, control boxes, or project panels. A flexible 5-wire ribbon cable connects the keypad to a standard 0.1" (2.54mm) female header, making it pin-compatible with standard breadboards and male jumper wires.

Key Features and Benefits

Ultra-Thin & Flexible: Low-profile membrane structure allows flush-mounting on project enclosures without taking up internal space.
Peel-and-Stick Mounting: Equipped with a high-tack self-adhesive back panel for instant installation on flat surfaces.
Standard 2.54mm Interface: Features a 5-pin female header that connects directly to standard male jumper wires and microcontroller development boards.
Simple 1-Common or Matrix Layout: Easy to program using standard Keypad libraries on Arduino, ESP32, STM32, and Raspberry Pi platforms.
Durable & Splash-Resistant: Sealed membrane layer protects internal contacts against dust, moisture, and general surface wear.

Technical Specifications

Feature Component	Specification Details
Circuit Rating	$35 ext{V DC}$ , $100 ext{mA}$ (Maximum)
Operating Voltage Range	Up to $12 ext{V DC}$ (Typically used at $3.3 ext{V} - 5 ext{V}$ for microcontrollers)
Dielectric Withstand Voltage	$250 ext{V VRMS}$ ( $50-60 ext{Hz}$ , $1 ext{ minute}$ )
Contact Resistance	$le 100 Omega$
Insulation Resistance	$ge 100 ext{ M}Omega$ at $100 ext{V DC}$
Bounce Time	$le 5 ext{ ms}$
Operating Life Expectancy	$ge 1 ext{ Million}$ actuations per key
Connector Type	5-Pin Dupont Female Header ( $2.54 ext{mm}$ pitch)
Operating Temperature	$-20^circ ext{C to } +40^circ ext{C}$

Pinout & Wiring Guide

The 1x4 membrane keypad exposes 5 conductors on its ribbon cable. Depending on the internal wiring variant (Common-Bus vs. 1x4 Matrix), the pins correspond to either a single common pin with 4 individual signal lines, or a 1-Row by 4-Column matrix:

Standard 5-Pin Layout:

Pin 1: Common Line / Row 1
Pin 2: Key 1 / Column 1
Pin 3: Key 2 / Column 2
Pin 4: Key 3 / Column 3
Pin 5: Key 4 / Column 4

Programming Tip: Connect Pin 1 to a digital pin (or Ground if using internal pull-up resistors), and Pins 2–5 to microcontroller digital input pins. Use internal pull-up resistors (INPUT_PULLUP in Arduino) to reliably detect button presses when a key pulls the input pin low.

Applications

Menu Navigation Systems: Up, Down, Select, and Back controls for LCD and OLED display menus.
Security & Access Control: Password and PIN code entry panels for electronic door locks and safes.
Mode Selectors: Switching operating modes on robotics, 3D printers, and test equipment.
DIY Smart Home Controllers: Custom wall-mounted lighting and scenario trigger switches.