2x4x3.5mm Side Tactile Push Button Switch with Bracket SMD

Specifications

• Switch Type: Tactile Push Button Switch
  
• Mounting Type: Surface Mount Device (SMD / SMT)
  
• Actuation Direction: Side-Actuated / Right-Angle Edge Mount
  
• Alignment / Retention: Dual Molded PCB Locating Posts & Reinforced Side Solder Bracket
  
• Circuit / Contact Form: Single Pole Single Throw - Normally Open (SPST-NO)
  
• Dimensions (L × W × H): 4.0mm × 2.0mm × 3.5mm [Estimated]
  
• Contact Rating: 50mA @ 12V DC Max
  
• Contact Resistance: 100mΩ Max
  
• Insulation Resistance: 100MΩ Min @ 100V DC
  
• Dielectric Withstanding Voltage: 250V AC for 1 minute
  
• Operating Force: 160gf ± 50gf
  
• Travel / Stroke: 0.25mm ± 0.1mm
  
• Operating Life: 50,000 to 100,000 cycles
  
• Terminal Configuration: 2-Pin SMD Solder Leads + Side Bracket Anchor Pads
  
• Operating Temperature: -20°C to +70°C
  
• Compatible Platforms: Custom PCBs, Wearables, Key Fobs, IoT Hardware, Handheld Devices

Project Evolution

Unlock New Capabilities

• Past Projects (Prerequisites)
  If you've already experimented with standard 6x6mm through-hole tactile buttons on breadboards or edge-mounted switches without mechanical brackets, you've likely encountered broken solder pads or wobbly button actuation. Transitioning to this 2x4x3.5mm side tactile switch with an integrated bracket is the next step for moving from fragile desktop prototypes to rugged, edge-actuated handheld electronic designs.
• Feature Upgrade (What This Unlocks)
  This 2x4x3.5mm side tactile switch unlocks robust right-angle side actuation along the outer perimeter of your circuit boards. Featuring dual molded PCB locating alignment posts and a reinforced metal side-retention bracket, it absorbs lateral pressing forces directly into the board assembly, enabling ultra-reliable side-mounted power, reset, and selection buttons that withstand tens of thousands of presses without tearing off the copper pads.

Effort Level & Minimum Hardware

Effort Level: Intermediate

Minimum hardware to get started:

• Custom PCB with Compatible SMT Footprint & Alignment Holes — required because this switch utilizes sub-miniature edge solder leads and dual underside alignment pegs that must seat into dedicated PCB guide holes.
• Fine-Tip Temperature-Controlled Soldering Station & Flux — required to solder the miniature surface-mount leads and structural side bracket tabs without overheating the internal contact dome.
• Microcontroller Development Board (Arduino Uno, ESP32, or RP2040) — required to provide the digital logic pull-up voltage and read button state transitions in firmware.

Virtual Technician & Pinout Guide

⚠️ Safety Warnings:

• Soldering Thermal Limits: Do not exceed 260°C for more than 5 seconds during hand or reflow soldering; excessive thermal exposure will melt the internal plastic housing and destroy the tactile snap dome.
  
• Mechanical Alignment First: Ensure both molded locating posts are fully seated flat into their corresponding PCB alignment holes before applying solder; soldering a tilted switch will cause severe lateral stress on the leads.
  
• Floating Input Prevention: Always configure the microcontroller GPIO pin with an internal pull-up resistor (or install an external 10kΩ pull-up resistor); leaving the input pin floating will cause random false triggers from electrical noise.

Package Includes: 

1× 2x4x3.5mm Side Tactile Push Button Switch with Bracket SMD

Frequently Asked Questions

1. Can this 2x4x3.5mm side tactile switch be used directly on a solderless breadboard? No, it features miniature SMD solder leads and bottom plastic alignment posts designed exclusively for custom PCBs; it cannot plug into standard 2.54mm breadboard tie-points.

2. Is this switch compatible with 3.3V and 5V microcontrollers like Arduino, ESP32, and Raspberry Pi Pico? Yes, as a passive mechanical dry-contact momentary switch, it interfaces seamlessly with 1.8V, 3.3V, and 5V logic inputs using internal microcontroller pull-up resistors.

3. Can this switch be used in slim handheld electronics, key fobs, and custom remote controls? Yes, its compact 2.0×4.0×3.5mm footprint and right-angle edge actuation make it ideal for low-profile enclosures requiring perimeter buttons.

4. What is the maximum electrical voltage and current rating for this tactile switch? The switch is rated for a maximum of 12V DC at 50mA, specifically engineered for low-power logic-level digital signaling and microcontroller GPIO sensing.

5. Can I use this tactile switch to switch power directly to a motor, solenoid, or high-power LED? No, attempting to switch loads drawing over 50mA will pit the internal contact dome; use the switch to signal a MOSFET, transistor, or relay instead.

6. How do I connect this 2-pin side switch to an Arduino GPIO pin? Connect Terminal 1 to any digital GPIO pin configured with INPUT_PULLUP in code, and connect Terminal 2 directly to circuit ground (GND).

7. Do the bottom plastic locating posts require electrical solder connections? No, the dual underside pegs are non-conductive plastic locating pins that seat into non-plated PCB alignment holes to provide mechanical shear stability.

8. Do I need a special Arduino library to detect button presses with this switch? No, you can read the state directly using standard digitalRead(), though implementing a simple debounce routine or using the Bounce2 library ensures clean triggers.

9. What debounce delay is recommended in firmware for this tactile switch? A software debounce delay between 10ms and 20ms in your microcontroller loop reliably eliminates mechanical contact chatter upon pressing and releasing.

10. Why is my microcontroller registering erratic or false button presses when the switch is untouched? This occurs if the GPIO pin is floating; ensure the microcontroller's internal pull-up resistor is enabled in code or wire an external 10kΩ pull-up resistor.

11. Why does the switch feel mushy or fail to click after soldering? Excessive soldering heat above 260°C or iron contact exceeding 5 seconds melts the internal plastic guide; always use light, quick iron touches under 3 seconds.

12. What should I do if the switch wobbles or lifts off the board when pressed? Ensure both plastic locating posts are fully flush inside their PCB holes and verify that the side metal bracket tabs are solidly wetted to grounded PCB solder pads.

13. Are these bracketed tactile switches batch inspected at Probots? Yes, every batch undergoes visual QC inspection at Probots in Bangalore to verify pin coplanarity, intact locating posts, and crisp tactile snap feedback.

14. Can OEMs, educational labs, and startups purchase these switches in volume quantities? Yes, Probots supports tiered bulk volume pricing and rapid shipping across India for prototyping labs, IoT startups, and electronics manufacturing OEMs.

15. Does Probots stock SMD soldering tools, flux pens, and precision tweezers for mounting this switch? Yes, we carry temperature-controlled soldering stations, no-clean SMD flux pens, fine 0.3mm solder wire, and anti-static ESD tweezers in our Bangalore warehouse.