The **G3B15AB-R-XC** is a specific model within the G3B series of ultra-miniature, process-sealed pushbutton switches manufactured by **NKK Switches**. These components are widely used in industrial and consumer electronics for PCB (Printed Circuit Board) mounting. --- ### 1. Key Technical Specifications The model number provides specific details about the part's construction and functionality: | Feature | Specification | Description | | :--- | :--- | :--- | | **Circuit** | SPDT | Single Pole Double Throw | | **Switch Function** | ON-(ON) | Momentary (Spring back to original position) | | **Rating** | 0.4VA Max @ 28V AC/DC | Logic Level (Gold contacts) | | **Mounting Type** | Through-Hole | PC Terminals (Straight) | | **Actuator** | 3.8mm Diameter | Standard Plunger | | **Sealing** | IP64 Equivalent | Process sealed for automated soldering/washing | --- ### 2. Breakdown of the Part Number The alphanumeric code designates specific physical and electrical characteristics: * **G3B**: Series identifier (Ultra-miniature pushbuttons). * **15**: Circuit configuration (SPDT, Momentary). * **AB**: Contact material and terminal type (Gold contacts, straight PC terminals). * **R**: Packaging/Actuator specifics (often refers to the plunger color or style). * **XC**: Special suffix (usually indicates a specific cap color or accessory included, where "C" often denotes a Red cap). --- ### 3. Electronic Design Features #### A. Contact Mechanism The device utilizes **Twin Crossbar (STC) contacts**. This design provides high reliability by ensuring that even if one contact point is obstructed by dust or oxidation, the second point maintains electrical continuity. This is critical for logic-level applications where voltages are too low to "burn off" oxidation. #### B. Environmental Protection * **Heat Resistance:** The housing is made of high-temperature resin (Polyphenylene Sulfide), allowing it to withstand vapor phase and infrared convection reflow soldering. * **Washable:** The switch is fully sealed with an O-ring and ultrasonic welding, allowing the PCB to be washed after soldering without contaminating the internal contacts. #### C. Size and Form Factor The "Ultra-miniature" designation means the body footprint is extremely small (roughly 7mm x 4.5mm), making it ideal for high-density boards where space is at a premium. --- ### 4. Common Applications * **Handheld Devices:** Due to its small size and tactile feedback. * **Reset Buttons:** Used as internal reset or configuration switches on motherboards. * **Medical Instrumentation:** Where reliability and sealing against fluids are required. * **Telecommunications:** Signal switching in networking hardware.