The **WJM-1E5-R** is a specific electronic component, typically categorized as a **Micro-Switch** or **Tactile Switch**, often utilized in consumer electronics, automotive controls, and industrial interfaces. Below is a detailed breakdown of its electronic characteristics and specifications. --- ### 1. General Specifications The WJM series generally refers to sub-miniature switches designed for high-density mounting. | Feature | Specification (Typical) | | :--- | :--- | | **Type** | SPST (Single Pole Single Throw) | | **Contact Material** | Silver-plated or Gold-flashed alloy | | **Operating Force** | 1.6N to 2.5N (varies by sub-model) | | **Switching Voltage** | 12V DC to 24V DC | | **Switching Current** | 50mA (standard for signal level) | | **Mounting Style** | Surface Mount (SMD) or Through-Hole | --- ### 2. Physical & Material Composition The "R" suffix in the part number often indicates compliance with **RoHS** standards or a specific **Tape and Reel** packaging for automated assembly. * **Housing:** High-temperature resistant thermoplastic (LCP or Nylon), allowing the part to withstand reflow soldering temperatures. * **Actuator:** Usually a soft-touch or hard plastic stem that triggers the internal metal dome. * **Terminals:** Copper alloy with lead-free plating to ensure high conductivity and oxidation resistance. --- ### 3. Electrical Performance To ensure reliability in digital circuits, the WJM-1E5-R adheres to strict electrical parameters: * **Contact Resistance:** Usually $\leq$ 100m$\Omega$ initially. * **Insulation Resistance:** $\geq$ 100M$\Omega$ at 100V DC. * **Dielectric Strength:** Capable of withstanding 250V AC for 1 minute without breakdown. * **Bounce Time:** Typically $< 5ms$, requiring software debouncing in microcontroller applications. --- ### 4. Typical Applications The compact footprint and tactile feedback make this part suitable for: 1. **Consumer Electronics:** Power buttons on cameras, smartphones, or wearables. 2. **Automotive:** Steering wheel controls or dashboard interface buttons. 3. **Computing:** Reset switches on Motherboards or PCB-mounted user inputs. --- ### 5. Schematic Representation In a circuit diagram, the part is represented as a simple momentary NO (Normally Open) switch: ```text [ Terminal 1 ] | / (Switch Actuator) | [ Terminal 2 ] ```