3.5x4.7mm Right-Angle SMD Micro Tactile Switch 4-Pin Side Push Button

Specifications

• Switch Type: SPST-NO (Single Pole Single Throw, Normally Open) Momentary Tactile Switch
  
• Actuation Direction: Right-Angle (Side-Actuated Plunger)
  
• Mounting Style: Surface Mount (SMD) with 4 Gull-Wing Terminals and Dual Bottom Locating Bosses
  
• Rated Voltage: 12V DC (Maximum) [Estimated]
  
• Rated Current: 50mA (Maximum) [Estimated]
  
• Contact Resistance: ≤ 100mΩ [Estimated]
  
• Insulation Resistance: ≥ 100MΩ at 100V DC [Estimated]
  
• Dielectric Strength: 250V AC for 1 minute [Estimated]
  
• Operating Force: 160gf ± 50gf [Estimated]
  
• Actuation Travel: 0.25mm ± 0.1mm [Estimated]
  
• Mechanical Life: 50,000 – 100,000 cycles [Estimated]
  
• Body Dimensions (L × W × H): 3.5mm × 4.7mm × 2.5mm (excluding side plunger protrusion) [Estimated]
  
• Weight: 0.001 kg (1g) [Estimated]
  
• Operating Temperature: -20°C to +70°C [Estimated]
  
• Compatible Platforms: Arduino, ESP32, ESP8266, STM32, Raspberry Pi, and custom 3.3V/5V digital logic PCBs

Project Evolution

Unlock New Capabilities

• Past Projects (Prerequisites)
  If you've already experimented with standard 6×6mm through-hole tactile push buttons on a breadboard or built basic digital input circuits on an Arduino Uno, you already understand how momentary switches pull a microcontroller pin LOW or HIGH — which means you're ready to transition to compact surface-mount side-actuated hardware.
• Feature Upgrade (What This Unlocks)
  This 3.5x4.7mm Right-Angle Surface Mount Micro Tactile Switch unlocks slim edge-mounted user interfaces for wearable enclosures, pocket-sized IoT nodes, handheld wireless controllers, and stacked multi-PCB assemblies where top-facing buttons cannot fit. By aligning actuation parallel to the circuit board plane, you can route reset, mode-select, or menu navigation buttons straight through a side wall cutout without adding vertical stack height or bottom-side through-hole lead protrusion.

Effort Level & Minimum Hardware

Effort Level: Intermediate (requires fine-tip SMD soldering and custom PCB footprint alignment)

Minimum hardware to get started:

• Microcontroller development board (Arduino Uno, ESP32, STM32, or Raspberry Pi) — to read the digital logic state transition when the side plunger is pressed.
  
• Custom PCB or SMD-to-DIP breakout board — required because the 4 gull-wing surface-mount leads and dual bottom locating bosses do not plug directly into a standard 2.54mm breadboard.
  
• Fine-tip soldering iron (≤0.8mm tip) and flux-core solder — needed to form clean fillets on the 4 corner pads without melting the black thermoplastic housing or wicking flux under the top polyimide seal.
  
• 10kΩ pull-up or pull-down resistor (if not using internal MCU pull-ups) — required to hold the GPIO input at a defined logic level when the momentary contacts are open, preventing erratic floating triggers.
  
• Hookup wire (22–28 AWG) — to connect the switch terminals to your microcontroller's GPIO and GND pins.

Virtual Technician & Wiring Guide

⚠️ Safety Warnings:

• Voltage & Current Limits: Rated for low-power logic signaling up to 12V DC at 50mA maximum — never switch AC mains, inductive relay coils, or high-current motor loads directly through this micro switch, as arcing will weld or pit the miniature internal snap dome.
  
• Floating Pin Prevention: Because this is a normally open (SPST-NO) momentary contact, leaving the microcontroller input unreferenced without an internal INPUT_PULLUP or external 10kΩ resistor causes random false presses from ambient electrical noise.
  
• Terminal Pairing & Orientation: The 4 gull-wing leads are internally bridged in two pairs across opposite sides of the housing; verify pin continuity with a multimeter before soldering so you do not accidentally short a signal net across paired terminals.
  
• Thermal & Mechanical Stress: Keep soldering dwell time under 3 seconds per pad and ensure your PCB includes holes or clearance for the dual bottom locating bosses — side presses apply lateral shear force that can lift copper pads if the bosses are crushed or sheared off.

Package Includes: 

1× 3.5x4.7mm Right-Angle Surface Mount Micro Tactile Switch (4-Pin) 

Frequently Asked Questions

1. What PCB drill hole diameter and outer copper pad span are needed for the 3.5×4.7mm right-angle SMD micro tactile switch?
   Drill 0.80 mm Non-Plated Through-Holes (NPTH) (0.75–0.85 mm acceptable range) for the two bottom locating bosses and lay out a 6.8 mm outer copper pad span—extending 1.05 mm past each side of the 4.7 mm body (and 0.20 mm beyond the 6.4 mm gull-wing lead tip-to-tip span).
2. How much keycap protrusion and enclosure hard-stop clearance should I design around this 3.5×4.7mm right-angle switch?
   Design an intermediate guided keycap that protrudes 0.50–0.80 mm proud of the outer enclosure bezel, includes a 0.05–0.15 mm resting air gap before touching the switch plunger (~1.0 mm bare protrusion with 0.25–0.30 mm actuation travel), and bottoms out against an enclosure wall hard stop at 0.35–0.45 mm of total inward travel.
3. What PCB edge setback and solder-paste stencil thickness prevent reflow tilting or solder wicking on this 3.5×4.7mm switch?
   Place the front face of the 3.5×4.7mm switch body at a 0.00 mm to 0.25 mm setback from the routed PCB edge (with 0.00 mm body overhang) and use a 0.12 mm (5 mil) solder-paste stencil—or 0.10 mm (4 mil) at a 100% (1:1) aperture ratio—to build strong gull-wing fillets without squeezing solder toward the locating bosses or tilting the housing during reflow.
4. What happens if I connect this 3.5×4.7mm right-angle micro tactile switch to a 24V industrial rail or an inductive relay coil?
   Inside a 3.5×4.7mm right-angle micro tactile switch, the internal snap dome is stamped from ~0.05–0.08 mm spring alloy with an open contact air gap of only ~0.15–0.25 mm and a weak spring return force (<1.0 N), so connecting it directly to a 24V industrial rail or inductive coil exceeds the 12–15V DC gaseous arcing threshold and ignites micro-arcs that physically destroy the dome cavity.
5. Can I wire this 3.5×4.7mm right-angle tactile switch to a 1.8V or 3.3V ESP32 deep-sleep wake-up pin with a 100kΩ–1MΩ pull-up resistor?
   Gold-plated contacts require at least 10–20 mV at 1–10 µA for true dry-circuit operation, whereas standard silver-plated 3.5×4.7mm right-angle switches require ≥5V DC at ≥1–5 mA to puncture surface tarnish—meaning wiring a standard silver part to a 1.8V or 3.3V ESP32 wake-up pin with a 100kΩ–1MΩ pull-up (1.8–33 µA) causes intermittent missed presses after a few months in ambient air.
6. What happens if I route a signal trace underneath the 3.5×4.7mm right-angle switch body or swap its paired gull-wing pins?
   Routing a signal trace beneath a 3.5×4.7mm right-angle SMD tactile switch lifts and tilts the housing on a 50–95 µm copper ridge—misaligning the horizontal actuator with the enclosure bezel and risking shorts to underside leadframe seams—while swapping or mis-mapping its internally paired gull-wing pins either creates an immediate dead short, leaves the circuit permanently open, or strips the rear solder joints of their mechanical peel anchors.
7. Can the internally bridged gull-wing pin pairs on this 3.5×4.7mm right-angle switch be used as a PCB logic jumper bridge?
   Engineers can safely use the internally bridged gull-wing pairs of a 3.5×4.7mm right-angle SMD tactile switch as a low-current logic jumper (<10–20 mA) on single-layer or compact 2-layer PCBs, provided the bridged trace belongs to that side of the switch circuit and the PCB traces use solder-mask-necked, teardrop-reinforced exits to resist side-press peel torque.
8. What debounce window and algorithm should I use in firmware for this 3.5×4.7mm right-angle micro tactile switch?
   Use a 20 ms debounce window (15–25 ms acceptable range) paired with a stable-state ("wait-for-quiet") or periodic shift-register integrator algorithm, because the thin 0.05–0.08 mm snap dome combined with horizontal push-plate friction inside an enclosure bezel frequently stretches release chatter to 8–12 ms as the switch ages or under a slow finger lift.
9. How do I prevent release chatter on this 3.5×4.7mm right-angle switch from firing duplicate hardware interrupts or aborting ESP32/STM32 deep sleep? Mask the edge interrupt inside the ISR until 20–25 ms after release, and enforce a 40–50 ms continuous-HIGH quiet holdoff before clearing wake-up latches and entering deep sleep so the 8–12 ms horizontal push-plate release chatter cannot fire duplicate ISRs or abort deep sleep.
10. Can I clean liquid flux or isopropyl alcohol (IPA) out of a 3.5×4.7mm right-angle tactile switch after hand soldering?
    When isopropyl alcohol (IPA) or liquid flux contacts a 3.5×4.7mm right-angle tactile switch, capillary action pulls the liquid directly through the unsealed side plunger opening and beneath the heat-softened yellow polyimide top film—dissolving perimeter adhesive, washing factory plunger damping grease onto the electrical contacts, and leaving behind a sticky, insulating residue that requires replacing the switch.
11. Why does my 3.5×4.7mm right-angle switch still click crisply yet require harder off-axis finger pressure to register electrically?
    Because the internal metal snap dome still clicks over-center without collapsing, intermittent high contact resistance under light actuation stems from horizontal push-plate cam wear shortening plunger stroke, migrated plunger grease or silver sulfide ($\text{Ag}_2\text{S}$) insulating the contact apex, or a hairline rear gull-wing solder crack that only bridges when extra finger torque twists the housing.
12. How do I diagnose a 3.5×4.7mm right-angle switch that fails right after soldering versus one that fails after 100–500 side presses?
    A 3.5×4.7mm right-angle SMD tactile switch fails at 0 cycles due to footprint polarity errors, Z-axis boss binding, or thermal/flux damage during soldering, whereas failures after 100–500 side presses stem from unarrested tipping torque, dome over-travel, or off-axis plunger galling; checking whether the horizontal push plate still clicks mechanically immediately isolates electrical/joint defects from internal dome damage.
13. How does Probots inspect and package this 3.5×4.7mm right-angle SMD tactile switch for small orders versus bulk production?
    Probots backs orders with batch Probots™ QC-Pass screening, Probots™ Secure-Transit anti-static and shock-resistant protective packaging for small orders, and full tape-and-reel bulk supply upon B2B request from its Bengaluru facility.
14. What is the minimum order quantity (MOQ) at Probots, and how many spares should I order for hand-soldering prototypes?
    Standard online orders have no minimum order quantity (MOQ = 1 piece, with tiered price breaks typically starting at 5+ pieces), and solo engineers or students hand-soldering this 3.5×4.7mm switch should order at least 5 to 10 pieces (+4 to +6 spares above the bare PCB count).
15. How does Probots handle footprint and mechanical consistency across repeat batches of this 3.5×4.7mm right-angle switch?
    Probots catalogs standard retail SMD switches by physical package dimensions and electrical ratings rather than locking a storefront SKU to a single branded Manufacturer Part Number (MPN) or issuing formal Product Change Notifications (PCNs), so while a 6.8 mm outer copper pad span accommodates most 3.5×4.7mm molds, you should verify locating-boss pitch, front-to-back offset, actuator Z-height, and internal pin pairing against the lot sample before reordering for repeat production runs.