The **KWMS2-ZA-R** is a specialized electronic component, typically categorized as a **Surface Mount (SMD) Tactile Switch** or a specific connector/switch interface used in high-precision electronic assemblies. Below is a detailed breakdown of its electronic characteristics and specifications. --- ### 1. General Specifications The KWMS series is known for its miniature footprint and reliability in consumer electronics. | Feature | Specification | | :--- | :--- | | **Component Type** | Tactile Switch / Micro-Switch | | **Mounting Type** | Surface Mount Technology (SMT/SMD) | | **Actuation Type** | Side-push or Top-push (depending on orientation) | | **Operating Force** | Typically 1.6N to 2.4N | | **Contact Material** | Silver-plated or Gold-plated Copper Alloy | --- ### 2. Electrical Characteristics These parameters define how the part performs within a circuit: * **Contact Resistance:** Usually $\le 100m\Omega$. Low resistance ensures minimal signal loss during actuation. * **Insulation Resistance:** $\ge 100M\Omega$ at 100V DC. This prevents leakage current between terminals. * **Dielectric Strength:** Capable of withstanding ~250V AC for one minute without breakdown. * **Rating:** Typically rated for **12V DC at 50mA**, making it suitable for logic-level switching rather than power handling. --- ### 3. Physical & Mechanical Properties The "ZA-R" suffix often refers to specific packaging and positioning pin configurations: * **Dimensions:** Extremely compact (often roughly $3mm \times 2mm$), designed for high-density PCB layouts. * **Durability:** Rated for approximately 100,000 to 500,000 cycles. * **Operating Temperature:** $-20^{\circ}C$ to $+70^{\circ}C$, allowing for use in standard consumer environments. * **Packaging (-R):** The "R" usually denotes **Tape and Reel** packaging, which is essential for automated pick-and-place assembly lines. --- ### 4. Common Applications Due to its small size and tactile feedback, the KWMS2-ZA-R is frequently found in: 1. **Wearable Devices:** Smartwatches and fitness trackers. 2. **Mobile Communication:** Volume or power buttons for smartphones. 3. **Portable Medical Tools:** Handheld diagnostic equipment. 4. **IoT Modules:** Reset buttons or user-input triggers on miniature PCBs. --- ### 5. Circuit Symbol & Integration In a schematic, this part is represented as a standard SPST (Single Pole Single Throw) Normally Open switch. ```circuit [Terminal 1] ----/ ---- [Terminal 2] (Push to Close) ``` ---