The **CRE10RRD-M0S-R** is a specific type of **Rotary Coded Switch** manufactured by **Copal Electronics** (now Nidec Components). These switches are used to convert a physical rotational position into a binary output, typically for setting addresses or modes on a circuit board. --- ### 1. Technical Specifications The part number can be broken down to understand its physical and electrical characteristics: | Feature | Specification | | :--- | :--- | | **Part Series** | CRE Series (Coded Rotary Switches) | | **Positions** | 10 Positions (0-9) | | **Output Code** | Real Binary Coded Decimal (BCD) | | **Actuator Type** | Recessed / Flush (Screwdriver slot) | | **Mounting Type** | Surface Mount (SMD / SMT) | | **Terminal Shape** | Gull-wing (R-bend) | | **Operating Temperature** | -40°C to +85°C | --- ### 2. Pinout and Logic Table As a BCD (Binary Coded Decimal) switch with 10 positions, it typically has 4 data pins plus a common pin. The output corresponds to the binary representation of the dial number. **Truth Table Example:** | Position | Pin 1 (1) | Pin 2 (2) | Pin 3 (4) | Pin 4 (8) | | :--- | :--- | :--- | :--- | :--- | | **0** | OFF | OFF | OFF | OFF | | **1** | **ON** | OFF | OFF | OFF | | **2** | OFF | **ON** | OFF | OFF | | **5** | **ON** | OFF | **ON** | OFF | | **9** | **ON** | OFF | OFF | **ON** | --- ### 3. Key Electronic Characteristics #### A. Contact Rating * **Switching:** Usually 5V DC, 100mA. * **Non-Switching:** Up to 50V DC, 100mA. * The low current rating indicates this is a **signal-level switch**, not intended to drive high-power loads directly. #### B. Durability and Sealing * **Washability:** These switches are often "process sealed" (using an O-ring), meaning they can withstand aqueous cleaning or wave soldering processes without internal contamination. * **Mechanical Life:** Typically rated for 10,000 to 20,000 steps. #### C. Footprint (SMD) * The "M0S" designation refers to the specific physical dimensions and the "R" at the end usually denotes **Tape and Reel** packaging for automated pick-and-place machines. --- ### 4. Common Applications * **Industrial Controls:** Setting a unique ID or address for a device on a bus (like RS-485 or CAN bus). * **Telecommunications:** Mode selection or configuration settings. * **Security Systems:** Manual hardware-based code entry or zone settings. ---