## Overview of B3W-9002-R2C The **B3W-9002-R2C** is a high-quality, illuminated tactile switch manufactured by **Omron Electronic Components**. This specific part belongs to the B3W-9 series, which is designed to provide both physical feedback (tactile click) and visual feedback through integrated LEDs. --- ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Switch Type** | Tactile Switch (SPST-NO) | | **Illumination** | LED (Red Color) | | **Actuation Force** | 1.57 N (approx. 160 gf) | | **Contact Rating** | 1 to 50 mA, 5 to 24 VDC | | **Mechanical Life** | 300,000 operations (minimum) | | **Mounting Type** | Through-hole | | **Dimensions** | 10mm x 10mm (Square) | --- ### 2. Physical Construction and Components The device is composed of several critical electronic and mechanical sub-parts: 1. **Plunger/Button:** The top moving part. In the "R2C" model, this features a **Clear** cap (indicated by the 'C' suffix) which allows the Red LED light to diffuse through. 2. **Internal LED:** A high-intensity Red LED is embedded within the switch housing. Note that the LED circuit is independent of the switch circuit. 3. **Contact Dome:** A metal snap-action dome that provides the "click" feel and bridges the internal electrical contacts when pressed. 4. **Terminals:** * **Switch Terminals:** Two pins for the SPST (Single Pole Single Throw) normally open circuit. * **LED Terminals:** Two dedicated pins for the LED anode and cathode. --- ### 3. Circuit Configuration The B3W-9002-R2C utilizes a 4-pin or 6-pin layout depending on the specific PCB footprint, but functionally operates as follows: ```cpp // Logic Diagram // Pin 1 & 2: Switch Contact (Normally Open) // Pin 3: LED Anode (+) // Pin 4: LED Cathode (-) ``` > **Important Note:** Always use a current-limiting resistor in series with the LED pins to prevent burning out the internal Red LED. --- ### 4. Applications * **Industrial Controls:** Status indicators for machinery. * **Consumer Electronics:** Power buttons or mode selectors. * **Medical Equipment:** User interface panels requiring high reliability. * **Instrumentation:** Testing and measurement devices.