The **5HT1.6-R** is a specific model of an **SMD (Surface Mount Device) Tactile Switch**. These components are fundamental in electronics for providing user input and tactile feedback in compact devices. --- ### 1. Technical Specifications Below are the typical electrical and mechanical characteristics for the 5HT1.6-R series: | Feature | Specification | | :--- | :--- | | **Type** | Tactile Switch (Momentary) | | **Mounting Type** | Surface Mount (SMD / SMT) | | **Height** | 1.6mm (Ultra-thin profile) | | **Operating Force** | Typically 160gf or 240gf (grams-force) | | **Contact Rating** | 50mA @ 12V DC | | **Insulation Resistance** | 100MΩ min. at 100V DC | | **Dielectric Strength** | 250V AC for 1 minute | | **Operating Life** | 100,000 to 500,000 cycles | --- ### 2. Physical Construction The "1.6" in the part number specifically refers to the **height** of the switch from the PCB base to the top of the actuator. * **Actuator:** The button pressed by the user. In the 1.6mm version, this is usually a flush or slightly raised hard plastic stem. * **Contact Dome:** A stainless steel or copper alloy dome that collapses when pressed, creating the "click" feel and completing the circuit. * **Terminals:** Lead-free, silver-plated terminals designed for reflow soldering. * **Base:** Heat-resistant thermoplastic (usually LCP or Nylon) to withstand soldering temperatures. --- ### 3. Circuit Diagram Most 5HT series switches are **SPST (Single Pole Single Throw)**, normally open. ```text Terminals 1 & 2 (In) | +-----o-----+ | | | / | <-- Momentary Contact (Dome) | o | +-----o-----+ | Terminals 3 & 4 (Out) ``` --- ### 4. Common Applications Due to its low profile (1.6mm), this part is primarily used in space-constrained consumer electronics: * **Wearables:** Smartwatches and fitness trackers. * **Mobile Devices:** Volume or power buttons for smartphones and tablets. * **Medical Gear:** Portable diagnostic handhelds. * **Automotive:** Key fobs and slim interior control panels. ---