4×4 Matrix 16-Key Rigid Plastic Matrix Keyboard Keypad Module

Description

This heavy-duty 4×4 Matrix Keypad is engineered for projects that require a professional-looking, robust user input panel. Built with hard-wearing plastic keycaps housed in a solid structural frame, it handles continuous wear and tear much better than soft membrane sheets or bare PCB switches.

Key Features:

Professional, High-Contrast Keycaps: Molded with bold, clear white lettering (1–9, 0, *, #, A, B, C, D) that won’t fade or wear away easily with frequent use.
Industrial/Enclosure-Friendly Design: Features dedicated perimeter mounting holes on the outer frame, making it perfect for flush panel-mounting onto project boxes or custom control faces.
Tactile and Silent Feedback: Provides a sturdy, responsive mechanical key travel with a quiet press action compared to loud clicking metal tactile domes.
Pin-Saving 4×4 Matrix Output: Saves significant microcontroller pin space by routing 16 separate inputs through a standard 8-pin interface header using row/column matrix scanning.

Technical Specifications:

Feature	Specification
Keyboard Layout	4 Rows x 4 Columns Matrix (16 Keys)
Key Legends	0 to 9, A, B, C, D, *, #
Keycap Material	Rigid ABS Plastic / Semi-rigid Industrial Rubber
Interface	8-Pin Output Header (Male Solder Pads / Pin Rows)
Pin Pitch	Standard 2.54 mm (0.1″)
Max Contact Rating	24V DC / 20mA
Insulation Resistance	>100mega ohms at 100V
Dielectric Strength	250V Rms (50-60Hz, 1 min)
Mechanical Life	$\ge 1,000,000$ operations per key
Operating Temperature	-20°C to +60°C
Dimensions	Approx. 65mm x 60mm (Compact frame size)

Pinout Configuration (8 Pins)

The module breaks out to an 8-pin interface representing the overlapping grid:

Pins 1–4: Row Lines (R1, R2, R3, R4)
Pins 5–8: Column Lines (C1, C2, C3, C4)

Common Applications:

Security & Access Systems: Digital pin-code entry panels for automated door locks or gates.
Industrial Equipment: Menu navigation and numerical data input on commercial machines.
ATM/Vending Machine Emulators: Simulating point-of-sale terminal keypads.
Advanced Arduino/MCU Projects: Custom control desks, home security setups, and standalone computing inputs.