SMD Tactile Push Button Switch 3×4×2.5mm

Overview

SMD Tactile Push Button Switch 3×4×2.5mm designed for compact electronic circuits, embedded systems, consumer electronics, DIY electronics, IoT devices, and PCB applications. A miniature surface-mount tactile switch providing momentary push-button input with reliable tactile feedback and long mechanical life.

This compact SMD tact switch is commonly used in ESP32 boards, STM32 projects, remote controls, keyboards, wearable electronics, smart home devices, and custom PCB designs where space-saving and reliable operation are important.

Specifications

Parameter	Value
Product Type	SMD Tactile Switch
Size	3mm × 4mm × 2.5mm
Mounting Type	Surface Mount (SMD/SMT)
Switch Type	Momentary Push Button
Contact Type	Normally Open (NO)
Operating Voltage	12V DC max
Rated Current	50mA
Contact Resistance	≤100mΩ
Insulation Resistance	≥100MΩ
Operating Force	~160gf ±50gf
Travel Distance	~0.25mm
Mechanical Life	Up to 100,000 cycles
Operating Temperature	-20°C to +70°C
Terminal Type	SMD Pads
Body Material	High-temperature plastic

Pin Configuration

Pin	Description
Pin 1	Switch Terminal A
Pin 2	Switch Terminal A
Pin 3	Switch Terminal B
Pin 4	Switch Terminal B

Pins on each side are internally connected.

Features

• Ultra compact size — ideal for small PCB layouts
• Surface mount design — suitable for automated SMT assembly
• Momentary tactile feedback — responsive button press feel
• Low profile height — space-saving mechanical design
• Reliable switching performance
• Long mechanical lifespan
• Easy PCB integration
• Low power signal switching
• Compatible with reflow soldering
• Widely used in embedded electronics

Common Applications

• ESP32 development boards
• STM32 embedded systems
• IoT devices
• Smart home products
• Wireless remote controls
• Keypad circuits
• Consumer electronics
• Robotics control panels
• Portable electronic devices
• DIY PCB projects

SMD Tact Switch vs Through-Hole Push Button

Feature	SMD Tact Switch	Through-Hole Button
Mounting	Surface Mount	Through-Hole
PCB Space	Very Small	Larger
Assembly	SMT Reflow	Manual Soldering
Height	Low Profile	Taller
Production	Mass Production	Prototype Friendly
Durability	High	High
Best For	Compact PCBs	Breadboard projects

Typical Wiring Example

Push Button with ESP32

Tact Switch	ESP32
Pin 1	GPIO0
Pin 3	GND

Push Button with STM32

Tact Switch	STM32
Pin 1	PA0
Pin 3	GND

Internal pull-up resistor can be enabled in software.

Basic Arduino Example

#define BUTTON_PIN 4

void setup() {
    Serial.begin(115200);

    pinMode(BUTTON_PIN, INPUT_PULLUP);
}

void loop() {

    if(digitalRead(BUTTON_PIN) == LOW) {
        Serial.println("Button Pressed");
    }

    delay(50);
}

PCB Design Notes

• Use proper SMD footprint matching 3×4×2.5mm package
• Recommended for reflow soldering
• Add software debounce for stable input reading
• Keep pads clean for reliable solder joints
• Avoid excessive mechanical force during assembly

Package Includes

• 1× SMD Tact Switch 3×4×2.5mm

Notes

• This is a momentary switch, not latching
• Suitable for low-current signal applications only
• Not intended for direct AC mains switching
• Store in dry environment before soldering
• Excessive heat may damage plastic housing
• Use debounce circuit or software filtering for stable operation