The **CRE08ROTM1S-R** is a specific model of a **Rotary Coded Switch** manufactured by **COPAl Electronics** (now Nidec Components). These components are primarily used to set digital values manually on a circuit board, such as addressing devices or selecting operating modes. --- ### 1. Key Technical Specifications Below are the primary electrical and mechanical characteristics of this part: | Feature | Specification | | :--- | :--- | | **Code Type** | Real Binary (Binary Coded Decimal - BCD) | | **Number of Positions** | 8 Positions (0 through 7) | | **Actuator Style** | Top Actuated / Flat Tool Slot | | **Mounting Type** | Through-Hole (THT) | | **Terminal Pitch** | 2.54 mm (Standard) | | **Voltage Rating** | 50V DC (Non-switching) / 5V DC (Switching) | | **Current Rating** | 100mA (Non-switching) / 20mA (Switching) | | **Operating Temp** | -25°C to +70°C | --- ### 2. Physical Construction The part is designed for durability and ease of integration into industrial or consumer electronics. * **Rotor:** The "ROT" in the part number indicates a rotary mechanism. It usually has a small slot that can be turned using a flat-head screwdriver. * **Housing:** Typically made of high-temperature plastic (PBT or PPS) to withstand soldering processes. * **Sealing:** The "-R" suffix often indicates **RoHS compliance** and, depending on the specific series revision, a "washable" construction (sealed with an O-ring) to protect against flux during soldering. --- ### 3. Pin Configuration & Logic As a **Real Binary** 8-position switch, it translates the physical position of the dial into a 3-bit binary output across its pins. * **Common Pin (C):** The input voltage or ground source. * **Output Pins (1, 2, 4):** These pins represent bits $2^0$, $2^1$, and $2^2$. * **Truth Table Example:** * Position 0: All pins Open (000). * Position 1: Pin 1 Closed (001). * Position 3: Pins 1 and 2 Closed (011). * Position 7: Pins 1, 2, and 4 Closed (111). --- ### 4. Common Applications * **Address Setting:** Used in RS-485 or CAN bus nodes to give each device a unique ID (0-7). * **Configuration:** Selecting internal hardware modes without needing a digital interface or software menu. * **Industrial Controls:** Setting timers, limit thresholds, or channel selection on PLCs and sensors. --- ### 5. Part Number Breakdown While manufacturer codes vary slightly, the CRE series generally follows this logic: * **CRE:** Series name (Coded Rotary Electronics). * **08:** Number of positions (8). * **R:** Real Code (vs. Complementary Code). * **OT:** Top Actuated. * **M1:** Lead shape / terminal style (Through-hole). * **S:** Sealed structure. * **-R:** RoHS Compliant.