The **CD10RK1-AB-R** is a specific type of coded rotary switch manufactured by C&K (now part of Littelfuse). These components are primarily used to set binary or hexadecimal values manually on a printed circuit board (PCB). ### 1. Component Overview The CD series consists of 10mm subminiature rotary DIP switches. The specific suffix `RK1-AB-R` defines its mechanical and electrical configuration. | Feature | Specification | | :--- | :--- | | **Manufacturer** | C&K / Littelfuse | | **Series** | CD Series | | **Code Type** | Binary Coded Decimal (BCD) | | **Number of Positions** | 10 Positions (0-9) | | **Actuator Style** | Flush Screw Driver Slot | | **Mounting Type** | Through-hole (Right Angle) | --- ### 2. Technical Specifications Understanding the electrical limits is crucial for integrating this part into a circuit: * **Switching Capacity:** 0.4 VA max @ 20 V AC or DC. * **Contact Resistance:** 50 mΩ max (initial). * **Insulation Resistance:** $10^9$ Ω min. * **Dielectric Strength:** 250 V RMS min. * **Operating Temperature:** -25°C to 85°C. * **Process Sealed:** Yes (withstands soldering and cleaning processes). --- ### 3. Pinout and Logic (BCD) As a **BCD (Binary Coded Decimal)** switch, it converts the physical position of the dial into a 4-bit binary output. When you turn the dial to a number, specific pins are connected to the "Common" (C) pin. | Position | Pin 1 ($2^0$) | Pin 2 ($2^1$) | Pin 4 ($2^2$) | Pin 8 ($2^3$) | | :--- | :--- | :--- | :--- | :--- | | **0** | Open | Open | Open | Open | | **1** | **Closed** | Open | Open | Open | | **5** | **Closed** | Open | **Closed** | Open | | **9** | **Closed** | Open | Open | **Closed** | --- ### 4. Part Number Breakdown (Suffix Meaning) * **CD10**: 10mm size, 10-position BCD. * **R**: Right Angle mounting (pins are bent 90 degrees). * **K**: Actuator type (Flush screw-driver slot). * **1**: Standard PC thru-hole terminals. * **AB**: Gold over nickel contact material (ensures high reliability in low-power logic circuits). * **R**: RoHS Compliant / Tape & Reel packaging (depending on context, usually indicates "RoHS"). ### 5. Common Applications * **Address Setting:** Setting unique IDs for devices on a BUS (like RS-485 or CAN). * **Configuration:** Selecting operating modes on industrial controllers. * **Hardware Presets:** Setting timer values or frequency channels on legacy hardware. ---