The **S02-03-R** is a specific electronic component typically identified as a **tactile switch** (often manufactured by companies like Multicomp or specific specialized switch vendors). It is a surface-mount or through-hole mechanical switch used for user input in electronic devices. --- ### 1. Key Technical Specifications The "S02-03-R" designation usually follows a standard naming convention for small-format switches. Below are the typical technical parameters: | Parameter | Standard Value | | :--- | :--- | | **Switch Type** | Tactile / Momentary | | **Contact Arrangement** | SPST-NO (Single Pole Single Throw - Normally Open) | | **Current Rating** | 50mA | | **Voltage Rating** | 12V DC | | **Operating Force** | 160gf to 260gf (Grams-force) | | **Actuator Style** | Round Button / Stem | | **Mounting Type** | SMT (Surface Mount) or Through-Hole (Model specific) | --- ### 2. Physical Construction The part is composed of four main electronic/mechanical sections: 1. **Actuator (Stem):** The physical part the user presses. In the S02-03-R, this is usually a short, rigid plastic stem. 2. **Contact Dome:** A precision-engineered metal alloy dome. When pressed, it collapses to provide tactile feedback ("click") and completes the electrical circuit. 3. **Housing/Base:** Usually made of high-temperature thermoplastic (like LCP) to withstand soldering temperatures. 4. **Terminals:** Silver or gold-plated leads that interface with the Printed Circuit Board (PCB). --- ### 3. Connection Diagram (Internal Logic) The switch is a "Normally Open" device. This means the circuit is broken until the button is physically depressed. ```text Pin 1 ----| |---- Pin 2 | / | | / | (Switch Mechanism) Pin 3 ----| |---- Pin 4 ``` *Note: In most 4-pin tactile switches, Pin 1 is internally connected to Pin 2, and Pin 3 is connected to Pin 4. Pressing the button bridges the gap between the 1-2 pair and the 3-4 pair.* --- ### 4. Common Applications * **Consumer Electronics:** Volume buttons, power buttons on cameras, or remote controls. * **Industrial:** Reset switches on microcontrollers (Arduino/ESP32 boards). * **Computing:** Mouse buttons or keyboard auxiliary keys.