Membrane Switch Matrix 4×3 Keypad

Membrane Switch Matrix 4×3 Keypad

A 4×3 Membrane Switch Matrix Keypad is commonly used in various applications such as calculators, telephones, and embedded systems for entering numeric data.

specifications:

Electrical Characteristics:

• Operating Voltage: 3.3V to 5V DC
• Operating Current: Less than 20 mA (depending on the pull-up resistors used)
• Contact Resistance: Typically less than 500 Ω
• Insulation Resistance: More than 100 MΩ at 250V DC
• Dielectric Strength: Can withstand up to 250V AC for 1 minute

Key Matrix Configuration:

• Rows: 4
• Columns: 3
• Total Keys: 12 keys (usually labeled 0-9, *, #)
• Connection Type: 7 pins (4 for rows and 3 for columns)

Mechanical Characteristics:

• Actuation Force: Typically around 150-200 grams

Environmental Characteristics:

• Operating Temperature: -40°C to +80°C
• Storage Temperature: -40°C to +85°C
• Humidity: Up to 95% RH, non-condensing

Pin Configuration:

• Pin 1-4: Correspond to Rows 1-4
• Pin 5-7: Correspond to Columns 1-3

Wiring and Interface:

• Connection: Often through a flexible ribbon cable with a standard connector or direct soldering onto a PCB.
• Compatibility: Generally compatible with microcontrollers like Arduino, PIC, or AVR for interfacing through GPIO pins.

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