The **TSH-31-R** is an electronic component primarily classified as a **Momentary Tactile Switch**. It is widely used in consumer electronics, automotive controls, and industrial interfaces due to its compact surface-mount design and reliable physical feedback. Below is a detailed breakdown of its electronic and mechanical specifications. --- ### 1. Technical Specifications The following table outlines the electrical and physical characteristics of the TSH-31-R: | Parameter | Specification | | :--- | :--- | | **Switch Type** | Tactile (Momentary) | | **Contact Rating** | 50mA @ 12V DC | | **Contact Resistance** | 100mΩ Max | | **Insulation Resistance** | 100MΩ Min @ 100V DC | | **Dielectric Strength** | 250V AC for 1 minute | | **Operating Force** | 160gf (±50gf) | | **Travel (Stroke)** | 0.25mm ± 0.1mm | | **Operating Life** | 50,000 to 100,000 cycles | --- ### 2. Physical Design & Mounting The "R" in the part number often denotes **RoHS compliance** or specific **Reel packaging** for automated assembly. * **Mounting Type:** Surface Mount Device (SMD/SMT). It is designed to be soldered directly onto the top layer of a PCB. * **Terminals:** Typically features 4 lead pins (internally connected in pairs) to provide mechanical stability on the board. * **Dimensions:** Usually follows a standard miniature footprint (e.g., 3mm x 6mm or 6mm x 6mm), making it ideal for high-density circuit boards. --- ### 3. Circuit Schematic The internal structure is a simple **SPST (Single Pole Single Throw)** normally open circuit. ```text (Pin 1) ----+---- (Pin 2) | [---] <-- Actuator/Dome | (Pin 3) ----+---- (Pin 4) ``` *When the button is pressed, the metal dome collapses and bridges the connection between the top and bottom pins.* --- ### 4. Common Applications * **Consumer Electronics:** Power buttons on remote controls, volume buttons on tablets. * **Automotive:** Dashboard controls and key fobs. * **Peripherals:** Reset buttons on routers or mode selection switches on printers. * **Medical Devices:** Control panels for portable diagnostic tools.