## Technical Overview: CD10RM0AK-R The **CD10RM0AK-R** is a specific model of a **Rotary Coded DIP Switch** manufactured by **C&K** (now part of Littelfuse). These components are widely used to set binary-coded decimal (BCD) values on a circuit board manually. --- ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Manufacturer** | C&K (Littelfuse) | | **Switch Type** | Rotary Coded DIP | | **Number of Positions** | 10 Positions (0-9) | | **Output Code** | BCD (Binary Coded Decimal) | | **Actuator Style** | Flush, Screwdriver Slot | | **Mounting Type** | Through-hole, Right Angle | | **Voltage/Current Rating** | 0.4VA @ 20V AC/DC | | **Contact Plating** | Gold over Nickel | --- ### 2. Breakdown of the Part Number The alphanumeric code provides specific details about the component's physical and electrical configuration: * **CD Series:** Subminiature 8mm Rotary DIP Switch. * **10:** 10 positions (BCD code). * **RM:** Right-angle, PC thru-hole mounting. * **0:** Flush actuator (requires a screwdriver to turn). * **A:** Process sealed (can withstand wave soldering and cleaning). * **K:** Contact material (Gold). * **R:** Tape and reel packaging (or specific suffix for RoHS compliance/Right angle orientation). --- ### 3. Electrical Function (BCD Coding) As the dial is turned from 0 to 9, the internal contacts close to represent the number in 4-bit binary. The pins are usually labeled **1, 2, 4, 8, and C (Common)**. **Truth Table Example:** | Dial Position | Common to Pin 1 | Common to Pin 2 | Common to Pin 4 | Common to Pin 8 | | :---: | :---: | :---: | :---: | :---: | | **0** | Open | Open | Open | Open | | **1** | **Closed** | Open | Open | Open | | **2** | Open | **Closed** | Open | Open | | **5** | **Closed** | Open | **Closed** | Open | | **9** | **Closed** | Open | Open | **Closed** | --- ### 4. Common Applications * **Industrial Controls:** Setting Modbus or CAN bus node IDs. * **Telecommunications:** Configuring addresses on rack-mounted hardware. * **Consumer Electronics:** Selecting modes or channels on a PCB that should not be changed by the end-user frequently. * **Security Systems:** Setting hard-coded zone identifiers. --- ### 5. Physical Characteristics * **Compact Size:** The 8mm square footprint saves significant board space compared to standard toggle DIP switches. * **Reliability:** The gold contacts ensure high reliability in low-voltage logic circuits where oxidation could otherwise cause signal failure. * **Environmental Protection:** The "A" designation indicates it is process-sealed with an O-ring, allowing it to be washed after soldering without damaging the internals.