Tact switch side push 2pin SMT

A side actuated tact switch is a momentary push button that is pressed from the side rather than the top. This makes it fundamentally different from standard 6×6mm or 12×12mm tactile switches, which are actuated perpendicular to the PCB. In a side push tact switch, the actuator extends outward from the board edge, allowing the button to be mounted flush against an enclosure wall. This orientation is essential for smartphones, where volume and power buttons sit along the device edge, as well as for Bluetooth earbuds, remote controls, and handheld medical instruments. The TS‑1100A takes this concept to its smallest practical form: a 2×4mm body that occupies less than 8mm² of board space while still providing a distinct tactile click. Its two‑pin SMT footprint eliminates through‑hole drilling entirely, making it compatible with high‑speed pick‑and‑place lines and lead‑free reflow soldering.

Inside every 2 pin SMT tact switch is a stainless‑steel metal dome that rests above a set of stationary contacts. When the side actuator is pressed, the force is transmitted perpendicular to the dome, causing it to collapse and bridge the two terminals. This snap action produces the characteristic audible click and tactile sensation. When pressure is released, the dome’s spring force returns it to its original convex shape, breaking the circuit. The entire mechanism is sealed within a high‑temperature LCP housing that withstands reflow temperatures up to 260°C. Because this side push tact switch uses only two pins—one for each side of the SPST‑NO circuit—it is the simplest possible tactile switch configuration. The absence of extra mechanical anchoring pins means the PCB pad design must provide sufficient adhesion, which is why the recommended land pattern uses slightly oversized pads and a solder mask defined (SMD) layout. For designs that experience unusually high side‑loading, a 4‑pin SMT tact switch may be preferred, but for applications where space is the absolute priority, a 2 pin SMT tact switch is the lightest and smallest option available.

An SMD side push switch offers three distinct advantages over top‑actuated alternatives. First, it enables edge‑mounted user interfaces, which is the standard configuration for smartphone volume rockers, e‑reader page‑turn buttons, and wearable device controls. The actuator can protrude through a precisely cut slot in the enclosure, while the switch body remains entirely within the PCB footprint—no additional bracket or flex cable is required. Second, the surface‑mount package eliminates through‑hole drilling, reducing PCB manufacturing cost and allowing the underside of the board to be used for additional routing. Third, the side‑actuated orientation naturally protects the switch from accidental top‑down impacts; the actuator is shielded by the device enclosure, so dropping the product rarely results in a damaged switch. The TS‑1100A exemplifies these advantages in an ultra‑miniature 2×4mm format. As a SMD side push switch, it is supplied in tape‑and‑reel packaging with a moisture sensitivity level (MSL) of 1, meaning no pre‑bake is required before reflow. This simplifies logistics and reduces the risk of solder defects caused by moisture absorption.

Selecting the right side push tact switch requires evaluating five key parameters. Body size is the first constraint: the TS‑1100A’s 2×4mm footprint is among the smallest available, but larger 3×4mm or 3×6mm options offer greater mechanical stability if space permits. Actuation force should match the intended user—160gf for light‑touch consumer devices, 260gf for industrial or gloved‑hand use. Actuator length must be chosen to protrude correctly through the enclosure wall; too short and the button feels recessed, too long and it may be accidentally pressed. Life cycle rating of 50,000 to 100,000 cycles is sufficient for most applications, but high‑use devices like gaming controllers may benefit from a 200,000‑cycle variant. Reflow compatibility is essential: the LCP housing of the TS‑1100A withstands lead‑free reflow up to 260°C, and its MSL 1 rating means no moisture baking is required. Finally, verify the recommended land pattern from the datasheet to ensure adequate pad size for the expected mechanical load. For a broader comparison of tactile switch types, see our Tact Switch Types Guide.

Side push tact switches are compact momentary switches designed for applications where top‑actuated switches cannot be used because of enclosure or PCB layout constraints. Their side‑actuated design provides reliable tactile feedback while minimizing board space. As a specialized side push tact switch manufacturer, Vistar Electronics offers a complete range of SMT side push tactile switches with multiple sizes, operating forces, and actuator heights for consumer electronics, industrial equipment, and OEM projects. Whether you need a side actuated tact switch for a new smartphone design or a micro tactile switch for a medical wearable, we provide free samples, fast lead times, and custom options including actuator length, plating material, and force profile. All products are RoHS and REACH compliant, with full test documentation available for your certification package.

Explore our complete tactile switch portfolio: Tactile Switch Category,  3×6mm Tact Switch, 6×6mm Tact Switch SMT, Waterproof Tact Switch, and 4 Pin SMT Tact Switch. For technical guidance, read our articles on What Is a Tact Switch?,  and How Does a Tact Switch Work?. For industry standards, refer to IEC Standards and RoHS Compliance Guide. To request a free sample of the TS‑1100A or discuss your requirements, contact sales@vistarelectronics.com.