Precision SMT Tact Switch For Smart Agriculture Terminals

A low-profile, high-precision surface-mount tactile switch engineered for rugged smart agriculture devices. Delivers crisp, repeatable feedback with tight actuation-force tolerance, wide operating temperature, and sealed options for dust and moisture. Optimized for compact handhelds, gateways, and sensor nodes exposed to field environments and frequent actuation.

Key Features

• Precision actuation: tight force tolerance for consistent user feel
• Low profile: as low as 1.85 mm height for slim enclosures
• Long life: up to 1,000,000 cycles (variant-dependent)
• Sealed variants: top-sealed to IP67 for dust and splashes
• Wide temperature range: -40 to +85°C standard; +105°C on request
• Reflow-ready: SMT, JEDEC-compliant lead-free reflow
• Multiple forces: 160/200/260/320 gf options with 0.2–0.5 mm travel
• Durable dome: stainless steel snap dome for crisp tactile feedback
• Corrosion-resistant finishes: gold or silver over nickel
• Compatible with overlays: works under membrane/keypad films and operator panels
• Tape-and-reel packaging for automated pick-and-place

Target Applications

• Smart agriculture handheld terminals and data loggers
• Field gateways and edge controllers
• Soil nutrient/moisture measurement devices
• Irrigation controllers and pump stations
• Greenhouse/HVAC controllers
• Livestock RFID readers and weigh-scale panels
• Drone/UAV ground-control accessories and portable chargers

Electrical Specifications

• Contact arrangement: SPST-NO (momentary)
• Rated load: 12 VDC, 50 mA max (resistive)
• Contact resistance: ≤100 mΩ initial; ≤200 mΩ after life
• Insulation resistance: ≥100 MΩ at 100 VDC
• Dielectric withstanding voltage: 250 VAC for 1 minute
• Bounce time: ≤5 ms typical
• LED option: available on select 6 x 6 mm variants (center- or side-LED)

Mechanical Specifications

• Operating force options: 160 gf (1.6 N), 200 gf (2.0 N), 260 gf (2.6 N), 320 gf (3.2 N)
• Total travel: 0.2–0.5 mm (variant-dependent)
• Actuator type: short plunger; extended caps available
• Operating life: 200,000 to 1,000,000 actuations (based on force, size, and sealing)
• Mechanical strength: withstands ≥30 N static load on actuator (momentary)

Environmental & Reliability

• Operating temperature: -40 to +85°C (standard); -40 to +105°C (on request)
• Storage temperature: -40 to +85°C
• Seal rating (sealed variants): IP67 top seal (dust-tight, temporary immersion)
• Vibration: 10–55 Hz, 1.5 mm DA, 2 hours per axis; no electrical discontinuity
• Mechanical shock: 100 G, 6 ms half-sine; functional
• Damp heat: 96 hours at 40°C, 95% RH; meets electrical criteria
• Salt spray (select metal-cap variants): 48 hours per ASTM B117; no red rust on metallic parts

Materials & Finish

• Housing: high-temperature thermoplastic (PBT or LCP), UL94 V-0
• Plunger/seal (sealed versions): silicone rubber
• Dome: SUS301 stainless steel snap dome
• Fixed/movable contacts: gold-over-nickel or silver-over-nickel
• Terminals: copper alloy, matte tin over nickel for solderability

Dimensions & Package Options

• Footprints compatible with industry-standard 3.5 x 2.8, 4.5 x 4.5, and 6 x 6 mm layouts
• Heights from 1.85 mm to 5.0 mm with cap options for panel interface
• Optional center post or side-actuation versions for tight layouts

PCB Footprint & Mounting

• Surface-mount gull-wing terminals; recommended land patterns provided in datasheet
• Keep-out zone around plunger to prevent overlay interference
• Use stiffeners or support under switch for thin PCBs (<1.0 mm) to ensure actuation consistency
• Ground plane under switch permissible; avoid solder mask openings beneath plunger cavity

Soldering & Reflow Profile

• Lead-free reflow per JEDEC J-STD-020: peak 250–260°C for ≤10 s, time above 217°C 60–90 s, ≤3 reflow cycles
• MSL: Level 1 (unsealed packaging)
• Hand soldering not recommended; if unavoidable, ≤350°C for ≤3 s, single touch, no side load on actuator
• Preheat per standard reflow curve; avoid localized hot-air rework directly on the plunger

Cleaning & Handling

• Sealed variants withstand IPA spray cleaning; do not immerse non-sealed types
• Avoid ultrasonic cleaning to prevent internal dome deformation
• Do not press actuator during board depaneling or while hot
• Storage conditions before use: 10–30°C, 30–70% RH, original tape-and-reel, away from solvents

Compliance & Certifications

• RoHS compliant (Directive 2011/65/EU and (EU) 2015/863)
• REACH compliant; SVHC screening on request
• Halogen-free options available
• Conflict minerals policy compliant; CMRT available
• Housing materials UL94 V-0 rated

Customization Options

• Actuation force and travel tuning for specific tactile feel
• Gold vs. silver contact plating for low-level vs. general-purpose switching
• Sealed (IP67) or non-sealed constructions
• Height, cap geometry, and color for panel integration
• LED integration (6 x 6 mm family); multiple colors
• Special lubricants for low-temperature or silent actuation
• Extended temperature materials up to +105°C
• Packaging quantities and reel widths per project needs

Typical Tape-and-Reel

• EIA-481 compliant
• 8 mm tape (3.5 x 2.8 and 4.5 x 4.5); 12 mm tape (6 x 6)
• 2,000–4,000 pcs per reel depending on size

Why It Fits Smart Agriculture

• Robust tactile feedback that remains consistent across temperature swings
• Sealed options resist dust, mud splashes, and field humidity
• Low-profile construction enables compact, glove-friendly HMI stacks with membrane overlays
• Long life and corrosion-resistant finishes suited to frequent use in outdoor terminals

Warranty & Support

• 12-month limited warranty against manufacturing defects
• Application engineering support: footprint reviews and overlay stack-up guidance
• PPAP and reliability test reports available for qualified projects