tactile push button 4.5x4.5 SMT button custom

Ultra-compact 4.5×4.5 mm SMT tactile push button designed for industrial control, smart panels, and dense PCBs. Delivers a crisp, consistent click with low profile options, reflow solderability, and wide customization for force, height, actuator style, sealing, and plating. Available in top-actuated and side-actuated variants (3-pin/4-pin).

Key Features

• 4.5×4.5 mm footprint; low-profile heights from ~2.0 to 7.0 mm
• SMT gull-wing terminals; reflow-ready (JEDEC J-STD-020 compliant profile)
• Precise tactile feedback; typical forces 160/240/320/400 gf
• Short travel for fast actuation; consistent bounce performance
• Options: top or side actuation, caps, colors, laser marking
• Mechanical life up to 1,000,000 cycles (variant-dependent)
• Operating temperature -40 to +85°C; standard IP40, optional sealed versions
• RoHS, REACH, halogen-free materials

Applications

• Smart control panels, building automation, HVAC controllers
• Industrial HMIs, measurement instruments, PLC I/O modules
• POS terminals, handheld devices, wearables, consumer electronics
• Automotive interiors (non-safety), medical electronics (non-life-support)
• Networking gear, gateways, smart home hubs

Core Specifications (typical)

• Size: 4.5×4.5 mm body; SMT gull-wing leads
• Poles/Terminals: 3-pin (side-actuated) or 4-pin (top-actuated)
• Actuation force: 160–400 gf selectable
• Travel: ~0.2–0.25 mm, tactile dome
• Rating: 12 VDC, 50 mA (logic level switching)
• Contact resistance: ≤100 mΩ (initial)
• Insulation resistance: ≥100 MΩ at 100 VDC
• Dielectric strength: 250 VAC, 1 min (no breakdown)
• Bounce time: ≤5 ms typical
• Operating temp: -40 to +85°C; storage -40 to +85°C
• Protection: IP40 standard; sealed options available
• Packaging: Tape & reel (8/12 mm), cut tape, or tray

Materials

• Housing: high-temperature thermoplastic (LCP/PA9T), UL94 V-0
• Contacts: copper alloy, silver or gold plating options
• Terminals: copper alloy with matte tin plating (lead-free)
• Spring/dome: stainless steel for stable tactile profile
• Actuator/cap: thermoplastic in black/gray/colored options

Dimensions & PCB

• Body: 4.5×4.5 mm; low standoff for stable reflow
• Actuator: top or side nub; multiple heights for panel alignment
• Recommended PCB pads: designed for solder fillet and inspection (layout file provided)
• PCB libraries: Altium/KiCad/Eagle footprints available
• 3D models: STEP/IGS for enclosure clearance and stack-up checks

Assembly Guidelines

• Reflow soldering only; wave solder not recommended
• JEDEC profile: preheat 150–180°C; peak ≤245°C; follow component-specific curve
• Avoid overtravel during placement; use pick-and-place with soft nozzle tips
• Cleaning: no immersion; use mild, no-residue flux and controlled solvent wipe
• Second reflow: supported; limit mechanical stress between passes

Reliability & Testing

• Mechanical life: up to 1,000,000 actuations (force-dependent)
• Vibration/shock: designed for industrial environments; test to IEC 60068 methods
• Environmental: humidity cycling and thermal shock verified on sealed variants
• Salt spray/corrosion-resistant materials optional for harsh conditions

Customization Options

• Actuation force and travel tuning
• Height, actuator style (top/side), cap shape and color
• Contact plating (Ag/Au) for low-level signal integrity
• Sealing level (dust/moisture), IP-rated versions
• Terminal configuration: 3-pin side-actuated, 4-pin top-actuated
• Packaging format (tape & reel/tray), laser marking/part ID
• Compliance: halogen-free, special material declarations

Ordering & Support

• Samples: available; typical dispatch in 3–5 days
• Lead time: standard 2–4 weeks; expedited builds on request
• MOQ: production lots from 1,000 pcs; small pilot runs supported
• Part numbering: T45-SMT-[Top/Side]-[Force]-[Height]-[Plating]-[Seal]
• Documentation: datasheet, reflow profile, PCB footprint, and STEP files provided

FAQ

• Top vs side actuation: choose top for direct finger input; side for low-profile front-panel alignment.
• Can it be washed after soldering? Use controlled solvent wipe; avoid ultrasonic immersion unless specified for sealed variant.
• LED integration: use external SMD LED/light pipe; this switch has no built-in illumination.
• Can I tune the click feel? Yes—force, dome geometry, and cap design can be customized.