The **CRE04RRD-L0S-R** is a specific model of a **Rotary Coded Switch** manufactured by **Copal Electronics** (now Nidec Components). These components are commonly used on Printed Circuit Boards (PCBs) to allow users or technicians to set manual configurations (like device IDs or operating modes). --- ### 1. Technical Specifications The following table summarizes the primary electrical and mechanical characteristics of the CRE04RRD-L0S-R: | Feature | Specification | | :--- | :--- | | **Product Type** | Rotary Coded Switch | | **Output Code** | Real Binary Coded Decimal (BCD) | | **Number of Positions** | 4 Positions (0, 1, 2, 3) | | **Actuator Style** | Recessed (requires screwdriver or tool) | | **Mounting Type** | Through-hole (R/A - Right Angle) | | **Contact Rating** | 100mA @ 50V DC (Non-switching) | | **Switching Rating** | 100mA @ 5V DC | | **Operating Temperature** | -40°C to +85°C | | **Washable** | Yes (Process sealed) | --- ### 2. Breakdown of the Part Number The alphanumeric code provides specific details about the switch's construction: * **CRE**: Series name (Copal Rotary Encoder/Switch). * **04**: Number of positions (4 positions). * **R**: Real Code (The output logic matches the physical position). * **RD**: Right-angle terminal configuration. * **L**: Low-profile design. * **0S**: Surface/Actuator type (Recessed slot). * **R**: Packaging type (usually denotes RoHS compliance or specific tray/reel packaging). --- ### 3. Key Electronic Functions #### Binary Coded Decimal (BCD) Output In a 4-position "Real Code" switch, the pins are energized based on the dial position. For a 4-position switch, it typically uses the Common pin and two output pins ($2^0$ and $2^1$): | Position | Logic Output (Binary) | Pins Connected to Common | | :--- | :--- | :--- | | 0 | 00 | None | | 1 | 01 | Pin 1 ($2^0$) | | 2 | 10 | Pin 2 ($2^1$) | | 3 | 11 | Pin 1 + Pin 2 | #### Design Advantages 1. **Process Sealed:** The "S" in the suffix usually indicates a sealed construction, allowing the PCB to be washed after soldering without damaging the internal contacts. 2. **Space Efficiency:** The "L" (Low profile) and "RD" (Right Angle) designations make it ideal for edge-mounting on thin devices where vertical space is limited. 3. **Gold-Plated Contacts:** Most CRE series switches use gold-over-nickel plating to prevent oxidation and ensure high reliability in low-current logic circuits. --- ### 4. Common Applications * **Industrial Controls:** Setting Modbus or CAN bus node addresses. * **Telecommunications:** Configuring channel settings on routers or base stations. * **Consumer Electronics:** Mode selection for hardware that does not require a digital display or menu system.