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Product Description
An ultra-thin, flat membrane matrix keypad module featuring a 16-key layout, ideal for sleek user interfaces and numeric input in Arduino and ESP32 projects. This flexible, low-profile keypad utilizes a sub-millimeter adhesive backing that allows it to be mounted flush against any flat enclosure or control panel surface. By arranging its 16 tactile contact switches in an efficient 4×4 matrix, it maps a full alphanumeric input array down to just 8 digital microcontroller pins. Designed with water-resistant membrane overlays and a bounce-resistant matrix layer, it offers an incredibly durable, dust-proof, and space-saving human-machine interface (HMI) for compact electronic systems and security enclosures.
Pinout / Layout Connections
The module breaks out its internal switch grid via a flat, flexible 8-pin female DuPont ribbon connector:
Pins 1 to 4 (Rows R1, R2, R3, R4): Connect to four digital I/O microcontroller pins to scan the horizontal matrix lines.
Pins 5 to 8 (Columns C1, C2, C3, C4): Connect to four digital I/O microcontroller pins to scan the vertical matrix lines.
Applications
Flush-Mount Security Panels: Perfect for building flat, weather-resistant digital combinations for outdoor keyless entries and smart lockers.
Compact Instrument Enclosures: Excellent for integrating clean, dust-resistant menu control pads onto handheld testing devices or portable diagnostic units.
Industrial Control Interfaces: Ideal for sleek user-input terminals on automated machines requiring easily cleanable, flat command surfaces.
Compatibility
The 4×4 Flat Membrane Keypad utilizes purely passive mechanical contacts, making it universally compatible with any development platform supporting digital logic:
Arduino Board Series (Uno, Mega, Nano, Pro Micro) utilizing the standard Matrix Keypad library.
ESP32 and ESP8266 boards (Fully compatible with both 3.3V and 5V digital input pins).
Raspberry Pi and Raspberry Pi Pico boards.
Standard Industrial PLCs and MCUs (STM32, PIC, AVR).
Technical Specifications
| Parameter | Value / Specification |
| Product Type | Ultra-Thin Flat Membrane Matrix Keypad |
| Total Keys | 16 Buttons (0-9, A-D, *, #) |
| Interface Type | 8-Pin Flex Ribbon Header (4 Rows x 4 Columns) |
| Max Operating Voltage | DC 35 V |
| Max Operating Current | 100 mA |
| Dielectric Strength | 250 Vrms (50-60Hz, 1 min) |
| Contact Bounce Time | $\le 5\text{ ms}$ |
| Operating Life | Greater than 1 million closures per key |
| Operating Temperature Range | -20 °C to +75 °C |
What’s in the Box
1 x 4×4 Flat Membrane 16-Key Matrix Keypad with integrated flexible ribbon cable and self-adhesive backing.
Available now from Pro Tronix with guaranteed quality and fast delivery nationwide.
