Product Specification
Product Description
Application Field
Why Choose Us
Product Description
This SMD tactile switch is engineered for Bluetooth-enabled devices that demand long life, crisp tactile feel, and ultra-compact size. With reflow-solderable gull‑wing terminals, low profile options, and multiple actuation forces, it integrates seamlessly into wearables, true wireless earbuds, smart trackers, remote controls, gamepads, styluses, and portable speakers.
Key features
- Long operating life: up to 1,000,000 cycles (variant-dependent)
- Compact SMD footprint for dense PCB layouts
- Low profile heights available (approx. 1.7–4.3 mm)
- Consistent tactile feedback with audible click options
- Multiple operating forces: 160/260/320 gf (custom on request)
- Short, controlled travel for fast, precise actuation
- Reflow solder compatible per JEDEC profiles
- Gold or silver contact plating for low contact resistance
- ESD robustness for consumer electronics integration
- Tape-and-reel packaging for automated pick-and-place
- RoHS and REACH compliant; halogen-free options
Typical applications
- Bluetooth earbuds/charging cases (pair/reset buttons)
- Wearables and smart bands
- Bluetooth remote controllers and gamepads
- Portable/Bluetooth speakers and smart home buttons
- Trackers, tags, and key finders
- Digital pens/styluses and e-ink note devices
- IoT sensors, beacons, and gateways
Electrical and Mechanical Specifications
- Function: momentary, normally open (SPST-NO)
- Rating: 12 VDC, 50 mA (signals/logic level)
- Contact resistance: ≤100 mΩ (initial)
- Insulation resistance: ≥100 MΩ at 100 VDC
- Dielectric strength: 250 VAC for 1 minute
- Operating force options: 160/260/320 gf (±20%)
- Travel: 0.15–0.35 mm (variant-dependent)
- Operating life: up to 1,000,000 actuations
- Bounce time: ≤5 ms
- Operating temperature: −40 to +85 °C
- Storage temperature: −40 to +85 °C
Mechanical and Construction
- Mounting: surface mount, gull‑wing terminals
- Actuation: top-actuated (side-actuated versions available)
- Heights: approx. 1.7 / 2.0 / 2.5 / 4.3 mm options
- Body sizes: popular footprints such as 3.5×2.6 mm, 4.2×3.2 mm, 6.0×3.5 mm (consult drawing)
- Contacts: Ag or Au over Ni
- Dome: stainless steel tactile dome
- Housing: heat-resistant thermoplastic (UL94 V-0)
- Sealing: IP40 standard; optional dust/washable film on select variants
Reliability and Compliance
- Thermal shock: −40/+85 °C, 5 cycles (pass typical)
- Damp heat: 85 °C/85% RH, 96 h (functional pass typical)
- Vibration: 10–55 Hz, 1.5 mm amplitude (no electrical discontinuity)
- ESD: up to ±8 kV air / ±4 kV contact (IEC 61000-4-2, device-level design dependent)
- Environmental: RoHS, REACH; halogen-free options available
Soldering and Assembly Guidelines
- Reflow soldering per JEDEC J-STD-020; peak 245–255 °C, ≤10 s above 245 °C
- Hand soldering not recommended; avoid wave solder
- Clean with no-residue flux; avoid ultrasonic cleaning if sealed film not specified
- Place keep-out under actuator to prevent mechanical interference
- Design for minimal side load on actuator in enclosure fit-up
Packaging
- Tape-and-reel for automated assembly
- Typical quantities: 2,000–5,000 pcs/reel (size-dependent)
- Moisture sensitivity level: MSL 1 (unless otherwise noted)
Design Benefits for Bluetooth Devices
- Long cycle life reduces field failures in high-use controls
- Low profile supports slim industrial designs
- Stable click force enhances perceived quality and usability
- Low contact resistance ensures reliable wake/pair/reset signals at low current
- ESD robustness helps protect sensitive RF SoCs during user interaction
Customization options
- Actuation force and travel tuning
- Gold plating thickness for low-level signal reliability
- Actuator height, cap interface, and color options
- Side-actuated versions for edge buttons
- Protective film for splash/dust resistance
- Pre-applied adhesive films or alignment fixtures
Ordering example
- Part: STS-42A-260F-2.0H-G-T/R
- STS: SMD tactile switch series
- 42A: 4.2×3.2 mm footprint, top-actuated
- 260F: 260 gf operating force
- 2.0H: 2.0 mm height
- G: gold-plated contacts
- T/R: tape-and-reel
