2×4 Horizontal Tact Switch for Compact Side-Actuated PCB Designs

The 2×4 Horizontal Tact Switch is a compact, side-actuated SMT tactile switch engineered for space-constrained PCB layouts where vertical height is at a premium. Unlike traditional top-actuated switches that require clearance above the PCB, the horizontal (side-push) design allows the button to be accessed from the edge of the board — making it the ideal right angle tactile switch for ultra-thin devices such as Bluetooth earbuds, smartwatches, and portable medical equipment.

This 2 pin horizontal tact switch features a momentary SPST-NO (normally open) circuit with crisp tactile feedback, rated at 50mA / DC 12V. The side actuated tactile switch design is optimized for SMT reflow soldering, enabling high-speed automated assembly and consistent manufacturing quality. With a compact 2×4mm footprint, this switch delivers reliable performance in high-density mounting applications where every millimeter of board space matters.

For engineers and procurement professionals seeking a reliable 2×4 tactile switch solution, this series offers multiple operating force options (180gf / 260gf), mechanical life ratings up to 100,000 cycles, and full RoHS & REACH compliance. Whether you’re designing consumer electronics, industrial controls, or IoT devices, this horizontal tact switch provides the durability and design flexibility your project demands. For a broader understanding of tactile switch technologies, we recommend reviewing the Tactile Switch Guide from Vistar Electronics.

The right angle tactile switch (horizontal) is the preferred choice when your product design requires a side-push button — such as power buttons on the edge of a smartphone, reset switches on a PCB edge, or volume controls on a wearable device. The vertical (top-actuated) switch, on the other hand, is better suited for applications where the button is accessed from the top surface of the device, such as a keypad or membrane interface.

Choose horizontal when: you need edge-mounted access, your device is height-constrained, or you want to minimize PCB footprint. Choose vertical when: you have ample height clearance, the button is accessed from the top, or you’re using a standard through-hole mounting configuration.

Proper PCB layout is critical to ensure reliable operation of the 2×4 horizontal tact switch. Follow these design guidelines for optimal performance:

• Keep-out Area: Reserve adequate clearance around the switch for actuator movement and to prevent interference with adjacent components. Ensure the side-push button has sufficient travel distance without obstruction.
• Button Clearance: For edge-mounted designs, verify that the switch actuator aligns correctly with the product’s external button or housing opening. The horizontal actuation requires precise mechanical alignment for consistent user experience.
• Actuator Alignment: The side-push mechanism relies on accurate alignment between the switch plunger and the external actuator. Consider using a mechanical stop or guide feature in the housing to prevent over-travel.
• SMT Pad Design: Follow the recommended land pattern provided in the datasheet. Ensure pad dimensions and spacing match the switch’s terminal layout for reliable solder joint formation.
• Reflow Soldering: This right angle tactile switch is compatible with standard SMT reflow profiles. Use a no-clean solder paste and follow the recommended temperature profile to avoid damage to the high-temperature thermoplastic housing.
• Mechanical Reinforcement: For applications subject to high actuation forces or repeated use, consider adding additional PCB support or mounting holes near the switch to reduce stress on solder joints.

For comprehensive guidance on tactile switch integration, refer to the Tactile Switch Testing Standards Guide from Vistar Electronics.

Choosing the optimal 2 pin horizontal tact switch for your application requires careful consideration of several key parameters:

• Operating Force: Select between 180gf (lighter touch, 50,000 cycles) and 260gf (firmer feel, 100,000 cycles). Lower force is preferred for consumer devices where user comfort is paramount; higher force is suitable for industrial applications where accidental actuation must be minimized.
• Actuator Height: Ensure the switch’s actuator height matches your product’s external button design. Custom actuator heights may be available for OEM projects.
• Mounting Space: Verify that the 2×4mm footprint fits within your PCB’s available area, with adequate clearance for SMT soldering and reflow processing.
• SMT Compatibility: Confirm that your assembly process supports SMT reflow soldering. This side actuated tactile switch is designed for standard reflow profiles and high-temperature resistance.
• Expected Lifecycle: Choose the operating force based on the expected number of actuations over the product’s lifetime. The 260gf option offers 100,000 cycles for high-use applications.
• Environmental Requirements: The TS-1100E is rated for operation from −25°C to +70°C, suitable for standard indoor environments. For harsh or outdoor conditions, consider Vistar’s IP-rated tactile switch options.

For custom requirements — including unique actuator heights, specific operating forces, or OEM marking — contact Vistar Electronics for engineering support and sample availability.

For engineers and procurement professionals seeking additional technical guidance, we recommend the following authoritative industry resources:

• IPC Standards – PCB assembly and electronic component reliability standards
• IEC Standards – International electrotechnical standards for electronic components
• JEDEC Standards – SMT packaging and reliability for solid-state electronics