Matrix 4×4 16 Keypad Keyboard Module is a rugged 16-key matrix keyboard module on an FR-4 printed circuit board. Featuring 16 durable tactile pushbuttons in a 4-row by 4-column matrix, this module delivers crisp mechanical clicks and superior longevity. Unlike flexible membrane keypads, this PCB board employs tactile pushbuttons with metal snap domes. Consequently, users receive unmistakable physical click feedback with every key actuation, ensuring reliable entry in high-tempo operations. By utilizing a 4×4 matrix, microcontrollers like Arduino, STM32, and ESP32 can scan all 16 buttons using eight GPIO pins (four row drive pins and four column sense pins). Furthermore, the rigid PCB features mounting holes at each corner, enabling sturdy fastening into panels. Additionally, silkscreen markings identify connections across a standard 8-pin 2.54 mm header. Therefore, this 4×4 tactile keyboard module is an outstanding choice for numeric security entry, CNC jog pendants, and embedded menu systems.
Key Features of the Matrix 4×4 16 Keypad Keyboard Module:
- Rigid FR-4 PCB Construction: High-strength printed circuit board construction provides exceptional rigidity and impact resistance.
- 16 Tactile Micro Switches: Independent tactile pushbuttons deliver sharp mechanical snap clicks on every actuation.
- Eight-Pin Multiplexed Matrix: Scans 16 discrete buttons using only eight microcontroller GPIO pins via 4×4 row-column scanning.
- Four Corner Mounting Holes: Includes precision mounting holes for secure screw fastening inside enclosures and panels.
Technical Specifications:
- Operating Supply Voltage: 3.3 V DC to 5.0 V DC (logic level compatible)
- Key Matrix Topology: 4 Rows × 4 Columns (16 independent tactile push buttons)
- Maximum Switch Contact Current: 50 mA at 12 V DC
- Closed Contact Resistance: <= 50 mΩ
- Insulation Resistance: >= 100 MΩ at 100 V DC
- Mechanical Actuation Lifespan: >= 100,000 switching operations per button
- Physical Board Dimensions: 43 mm × 39 mm × 11 mm
Mechanical Specifications:
- Substrate / Package: High-grade FR4 double-sided PCB or molded protective casing
- Terminal Connection: Standard 2.54 mm pitch through-hole solder pins or screw terminal block
- Mounting Support: Integrated chassis mounting holes compatible with M2.5 / M3 hardware
- Form Factor: Low-profile footprint engineered for tight embedded enclosures
Dimensions:
- Body Length: Standard miniature hardware dimensions
- Body Width: Optimized narrow profile for modular stacking
- Pin Pitch: 2.54 mm (0.1 inch) breadboard-compatible spacing
- Net Weight: Ultra-lightweight construction for portable and mobile robotics
Pinout and Wiring:
- R1: Row 1 scanning input pin connecting across keys in Row 1.
- R2: Row 2 scanning input pin connecting across keys in Row 2.
- R3: Row 3 scanning input pin connecting across keys in Row 3.
- R4: Row 4 scanning input pin connecting across keys in Row 4.
- C1: Column 1 sensing output pin connecting to microcontroller digital input.
- C2: Column 2 sensing output pin connecting to microcontroller digital input.
- C3: Column 3 sensing output pin connecting to microcontroller digital input.
- C4: Column 4 sensing output pin connecting to microcontroller digital input.
Datasheet Reference:
Commonly Used in:
- Security PIN Keypads: Entering numerical access codes on electronic door strike controllers and gates.
- CNC Milling Machine Pendants: Commanding axis inching, spindle speeds, and feed rate overrides on milling machines.
- Industrial Batch Counters: Setting production batch targets and cycle parameters on manufacturing floors.
Applications:
- Vandal-Resistant Enclosures: Serving as heavy-duty front-panel keypads for public ticketing and parking kiosks. Browse our comprehensive selection of keypad and touch modules to discover complementary user interface components.
- Educational Microcontroller Lab Trainers: Teaching engineering students row-column matrix scanning and debounce algorithms.
- Electronic Musical Keyboards: Creating durable 16-step polyphonic rhythm sequencers and MIDI synthesizers.
Equivalent Models:
- Pin-Compatible Industry Equivalent: Standard commercial equivalent module with matched pinouts and voltage ratings.
- Integrated Breakout Alternative: Surface-mount IC alternative offering equivalent functional performance.
- High-Precision Variant: Alternative sensor series offering calibrated digital bus communication, whereas this module provides straightforward plug-and-play operation.
Package Includes:
- 1 x Matrix 4×4 16 Keypad Keyboard Module
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