4 Pin SMT Tact Switch — 3x3x0.8mm Miniature Top Push Button

The 3x3x0.8 SMD tactile switch is one of the smallest standard tactile switch formats available, with a body height of only 0.8mm. This ultra-low profile makes it suitable for PCB assemblies where vertical clearance is extremely limited, such as wearables, TWS earbud charging cases, and compact portable electronics.

The TS-3308 is a miniature SMD push button that combines a 3×3mm footprint with a 0.8mm height. Despite its small size, it provides a clear tactile response with a specified travel of 0.15±0.10mm. The switch is available in two operating force options — 180gf and 260gf — allowing designers to select a lighter or firmer press feel depending on the application.

As a surface mount tact switch, the TS-3308 is designed for automated pick-and-place assembly and reflow soldering. Its 4-pin configuration provides two electrical terminals plus two mechanical anchor pins, improving PCB retention compared to 2-pin alternatives. Manufactured in an ISO 9001:2015 certified facility, it is fully compliant with RoHS 3 and REACH regulations.

Below are the published specifications for the 4 pin tactile switch SMT TS-3308. Verify all values against the latest engineering drawing before production release.

Operating force, mechanical life, and other performance characteristics may depend on the selected version. Confirm the corresponding specifications with Vistar before placing a production order.

The 3x3x0.8 SMD tactile switch format is designed for applications where the PCB height budget is extremely tight. With a body height of just 0.8mm, this switch can fit underneath components, within stacked board assemblies, or inside enclosures that would not accommodate a standard 1.5mm or 2.0mm tactile switch.

Typical applications for this ultra-compact format include TWS earbud charging cases, smartwatches, fitness trackers, hearing aids, and other wearable devices. The switch is also suitable for compact medical devices, portable instruments, and any PCB design where board real estate and vertical clearance are both at a premium.

When integrating the 3x3x0.8 SMD tactile switch into a PCB design, engineers should verify the complete land pattern from the manufacturer’s drawing. The small pad geometry requires careful stencil design and solder paste volume control to ensure reliable solder joints. For guidance on land pattern design, refer to the IPC standards organization recommendations for surface-mount components.

A miniature SMD push button with a 4-pin configuration offers mechanical advantages over 2-pin alternatives. In the TS-3308, two pins serve as electrical contacts while the other two act as mechanical anchors. This four-point soldering creates a more stable joint on the PCB, resisting the rocking and pad-lifting that can occur under repeated actuation.

The 4-pin design also improves thermal distribution during reflow soldering. With four pads instead of two, heat is distributed more evenly, resulting in more consistent solder fillets and higher first-pass assembly yields. For high-volume production, this can reduce rework and improve overall manufacturing efficiency.

When selecting a miniature SMD push button for a new design, engineers should compare the footprint, operating force, travel, and expected life against the application requirements. The TS-3308 is available with 180gf and 260gf operating force options and 50,000 or 100,000-cycle life ratings. The appropriate combination depends on the intended user interface and usage frequency.

A surface mount tact switch is designed for direct soldering onto the PCB surface using reflow processes. Unlike through-hole switches, SMT components sit entirely on one side of the board, enabling higher circuit density and automated pick-and-place assembly. The TS-3308 is supplied in tape-and-reel packaging for high-speed placement equipment.

During PCB layout, the switch footprint should be created from the manufacturer’s recommended land pattern. The 3×3mm body size does not define the complete pad geometry — pad dimensions, spacing, and orientation must be taken from the technical drawing. For additional guidance on surface-mount land pattern design, engineers can refer to the IPC-7351 land pattern standard.

Reflow soldering conditions should follow the component manufacturer’s recommended profile. The switch housing and internal contacts are designed to withstand standard lead-free reflow temperatures, but excessive heat or prolonged exposure can affect mechanical performance. Sample boards should be assembled and inspected before mass production.

Selecting the right 4 pin tactile switch SMT for an application requires matching the switch specification to the electrical, mechanical, and environmental requirements of the finished product.

Electrical Requirements

The TS-3308 is rated for 50mA at 12V DC. Compare this rating against the actual circuit voltage and current. The switch is suitable for signal-level switching and low-power control functions. It should not be used as a substitute for a dedicated high-current power switch. Transient conditions, switching frequency, and load characteristics should also be considered.

Mechanical Requirements

The 3×3×0.8mm body size and 0.15mm travel make this switch suitable for compact designs. However, engineers should verify the actuator height, external button alignment, and clearance around the component. The external button or keypad mechanism must provide sufficient travel without applying continuous preload to the actuator.

Operating Life

The TS-3308 is available with 50,000 or 100,000-cycle life ratings. For applications with frequent button presses — such as wearables or portable devices — the higher-life version may be more appropriate. For less frequently operated controls, the 50,000-cycle version may be sufficient.

Assembly Process

Confirm that the tape-and-reel packaging is compatible with the pick-and-place equipment and that the reflow profile meets the component specification. For prototype and low-volume production, bag packaging is also available.

For switch qualification and international electronics production, the following official references provide useful background information:

• International Electrotechnical Commission (IEC) — standards for electrical and electronic equipment
• IPC — Association Connecting Electronics Industries — land pattern and assembly standards
• European Commission — RoHS Directive
• European Chemicals Agency — REACH

These references are provided for engineering and compliance background. The applicable requirements for the finished equipment should be determined according to the product category, destination market, and customer specifications.

What Is a 4 Pin SMT Tact Switch?

A 4 pin SMT tact switch is a surface-mount momentary push button with four terminals arranged in a compact package. Two terminals provide the electrical switching function, while the other two serve as mechanical anchors that improve PCB retention. The TS-3308 is a 3×3×0.8mm version rated for 50mA at 12V DC, with 0.15±0.10mm travel and selectable operating forces.

Because of its ultra-low profile and compact footprint, this switch format is commonly considered for wearables, TWS earbud charging cases, portable medical devices, and other compact electronics where board space and vertical clearance are both limited.

3x3x0.8 SMD Tactile Switch — Ultra-Compact Format

The 3x3x0.8 SMD tactile switch format is one of the smallest standard tactile switch sizes. The 0.8mm body height allows the switch to be integrated into PCB assemblies that cannot accommodate taller components. This makes it suitable for stacked board designs, wearable electronics, and slim portable devices.

When integrating an ultra-compact SMD tactile switch into a PCB design, engineers should pay particular attention to the land pattern and stencil design. The small pad geometry requires careful solder paste volume control to ensure reliable solder joints. The manufacturer’s recommended land pattern should be followed rather than derived from the nominal body size alone.

Miniature SMD Push Button — 4 Pin Configuration Benefits

A miniature SMD push button with a 4-pin configuration offers mechanical advantages over 2-pin alternatives. The additional two pins act as mechanical anchors, providing a more stable solder joint and reducing the risk of pad lifting under repeated actuation. This is particularly important for switches that will be operated frequently by the end user.

The 4-pin design also improves thermal distribution during reflow soldering. With four pads, heat is distributed more evenly across the component, resulting in more consistent solder fillets and potentially higher first-pass assembly yields.

Surface Mount Tact Switch — PCB Assembly Considerations

A surface mount tact switch is designed for automated pick-and-place assembly and reflow soldering. The TS-3308 is supplied in tape-and-reel packaging, making it compatible with high-speed placement equipment. During PCB layout, the footprint should be created from the manufacturer’s recommended land pattern, and the reflow profile should follow the component specification.

For high-volume production, sample boards should be assembled and inspected before mass production. This helps identify any footprint or soldering issues early in the process.

Applications Across Industries

This 4 pin tactile switch SMT is found across wearables, TWS earbud charging cases, portable consumer electronics, medical devices, IoT hardware, gaming peripherals, and OEM control assemblies. Typical applications include reset buttons, mode selection inputs, setup keys, and compact user interface controls where a small, top-actuated momentary switch is required.

Why Choose Vistar as Your Tactile Switch Supplier

Vistar Electronics is a trusted manufacturer and supplier of tactile switches serving customers in consumer electronics, industrial automation, and communication equipment. Our tactile switch lineup covers 3×3mm, 4×4mm, 4.5×4.5mm, 6×6mm, and 12×12mm configurations with various pin counts, operating forces, and mounting options.

With ISO 9001:2015 certification and a commitment to continuous improvement, Vistar is your reliable partner for high-quality switching solutions. For more technical resources, including PCB layout guidelines and switch selection guides, visit our technical blog or contact our engineering support team directly.

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