Miniature Tactile Push Button Switch For Bluetooth Electronics

A compact, low-profile SMT tactile switch engineered for Bluetooth-enabled devices and wearables. Its 3.5 × 2.6 mm footprint, multiple height options, and crisp tactile feedback make it ideal for earbud charging cases, BLE module reset/boot, headphones, trackers, and other space-constrained electronics. Designed for high reliability with up to 1,000,000 mechanical cycles and optional sealing for improved environmental resistance.

Key Features

• Ultra-compact footprint: 3.5 × 2.6 mm (SMT, top-actuated)
• Low profile heights: 1.5 mm, 1.8 mm, 2.0 mm
• Tactile force options: 150 gf, 230 gf, 320 gf
• Short travel with distinct click for precise user feedback
• Long mechanical life: up to 1,000,000 cycles (application dependent)
• Electrical rating: 12 VDC, 50 mA (max)
• Optional IP67 variant for splash and dust resistance
• RoHS and REACH compliant; halogen-free
• Gull-wing terminals for stable reflow soldering
• Suitable for automated pick-and-place; tape-and-reel packaging

Typical Applications

• Earbud/earphone charging case buttons (pairing/reset/open-lid detect)
• Bluetooth headphone and headset controls
• BLE module reset/boot configuration
• Wearables (rings, bands, trackers, medical/fitness devices)
• Smart tags, beacons, and small remote controllers
• Hearing aids and compact consumer electronics
• IoT nodes and handheld gadgets

Electrical Specifications

• Rated voltage/current: 12 VDC, 50 mA (max)
• Contact resistance: ≤ 200 mΩ (initial)
• Insulation resistance: ≥ 100 MΩ at 100 VDC
• Dielectric strength: 250 VAC for 1 minute
• Bounce time: typically ≤ 5 ms (depends on force/travel)

Mechanical Specifications

• Dimensions: 3.5 × 2.6 mm body; heights 1.5/1.8/2.0 mm
• Actuation forces: 150/230/320 gf (± tolerance)
• Travel: ~0.20 mm typical short travel
• Operation life: up to 1,000,000 cycles (force-dependent)
• Operating temperature: -40 °C to +85 °C
• Actuation type: top-press; tactile dome mechanism

Materials and Finish

• Actuator: high-temperature LCP or equivalent
• Base/housing: engineering thermoplastic
• Contacts: copper alloy with protective plating
• Terminals: Pb-free Sn plating (solderable), compatible with SAC alloys

Reliability and Compliance

• Environmental tests: thermal cycling, vibration, and humidity (e.g., 85 °C/85% RH)
• Optional sealed version (IP67) for splash/dust-prone use cases
• Compliant with RoHS and REACH; halogen-free
• Lot traceability and process controls for consistent performance

Soldering and Assembly Guidelines

• Reflow soldering: lead-free profile, peak 245 °C max; follow standard SAC profiles
• Reflow cycles: up to 2 passes recommended
• Preheat: 150–180 °C; avoid rapid thermal shocks
• Hand soldering: 350 °C max, 3 seconds per terminal; avoid side-load on actuator
• Cleaning: aqueous cleaning acceptable for sealed variant; avoid solvent ingress on unsealed parts
• Placement: use vacuum nozzle; avoid pressing the actuator during pick-and-place
• Keep-out: maintain mechanical clearance above actuator to prevent preloading

Packaging

• Tape-and-reel for automated assembly (8 mm embossed tape)
• Typical reel count: 3,000–4,000 pcs per reel
• Orientation marks and lot/date codes included
• Standard moisture barrier bag as applicable

Ordering Information

• Example part number: MT-3526-H18-F230-IP0-T
• MT: Miniature Tactile series
• 3526: 3.5 × 2.6 mm footprint
• H18: 1.8 mm height (H15/H20 available)
• F230: 230 gf actuation force (F150/F320 available)
• IP0: unsealed (IP7: sealed)
• T: tape-and-reel packaging
• Custom variants available on request

Customization Options

• Actuation force tuning (approx. 100–500 gf)
• Height adjustments (1.3–2.5 mm, subject to tooling)
• Sealed (IP67) construction and extended environmental ratings
• Contact plating upgrades (e.g., gold flash for low-level signals)
• Actuator profile/feel optimization, travel tuning
• Laser marking or custom orientation indicators
• Tailored tape-and-reel orientation and packaging quantities

Design Resources

• 2D drawings and 3D STEP models available
• Recommended PCB footprint and stencil guidelines (Altium/KiCad files)
• Application notes for earbud case integration and BLE reset circuits

Notes

• Final performance depends on PCB layout, solder profile, and mechanical stack-up
• Validate tactile feel and life in the end product; force choice impacts longevity and click
• Avoid continuous side-loads or preloads on the actuator after assembly