The **CS-12A-R/E** is a precision **rotary DIP switch** manufactured by **Nidec Components (formerly Copal Electronics)**. These switches are commonly used on Printed Circuit Boards (PCBs) to set configurations, addresses, or modes. --- ### ## Technical Specifications Below is a breakdown of the electronic and physical characteristics of the CS-12A-R/E: | Feature | Specification | | :--- | :--- | | **Product Type** | Rotary Coded Switch | | **Circuit Type** | Real Code (Binary Coded Decimal - BCD) | | **Number of Positions** | 10 (0 through 9) | | **Mounting Type** | Surface Mount (SMD / Gull-wing) | | **Actuator Type** | Flat (Flush) - requires a screwdriver | | **Terminal Pitch** | 2.54 mm | | **Operating Temperature** | -40°C to +85°C | | **Switching Rating** | 0.5 VA (Max) / 25mA at 20V DC | | **Seal Quality** | Washable (O-ring sealed) | --- ### ## Key Electronic Features #### 1. Binary Coded Decimal (BCD) Output The "12A" designation indicates the coding scheme. In this model, the switch outputs a **Real Code**. - As you rotate the dial from 0 to 9, specific pins are connected to the "Common" pin to represent that number in binary. - This allows a microcontroller to read 4 pins and determine one of ten possible settings. #### 2. Surface Mount Technology (SMT) The **"R/E"** suffix refers to the packaging and lead style: - **R:** Indicates **Tape and Reel** packaging, suitable for automated pick-and-place assembly machines. - **E:** Specifies the lead shape and specific environmental compliance (RoHS). #### 3. High Reliability Construction - **Gold-plated contacts:** Ensures low contact resistance and prevents oxidation over long periods. - **Wiping Mechanism:** The internal contacts "wipe" across each other during rotation to remove dust and debris. - **Sealed Structure:** The unit is dust-proof and can withstand aqueous or chemical cleaning after soldering. --- ### ## Common Applications * **Industrial Automation:** Setting Modbus or CAN bus node IDs. * **Telecommunications:** Configuring hardware addresses on backplanes. * **IoT Devices:** Manual mode selection (e.g., selecting between Test, Production, and Setup modes). * **Appliances:** Internal service settings that shouldn't be changed by the end-user. ---