The **A6A-R** is a series of **Rotary DIP Switches** manufactured by Omron. These components are used to set binary or hexadecimal values on a circuit board manually, often for address setting or mode selection. --- ## 1. Technical Specifications The A6A-R is characterized by its compact size and top-actuated rotary mechanism. | Feature | Specification | | :--- | :--- | | **Manufacturer** | Omron Electronics | | **Output Code** | BCD (Binary Coded Decimal) or Hexadecimal | | **Number of Positions** | 10 (0-9) or 16 (0-F) | | **Mounting Type** | Through-hole (PCB) | | **Actuator Type** | Flat / Screwdriver Slot | | **Contact Rating** | 100mA at 28VDC | | **Dielectric Strength** | 500 VAC for 1 minute | --- ## 2. Pin Configuration and Logic The A6A-R series typically uses a 4-bit output system. Depending on the position of the dial, specific pins are connected to the "Common" pin. ### Truth Table (Example: BCD 10-position) | Dial 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** | --- ## 3. Key Electronic Characteristics * **Subminiature Design:** Measuring approximately 10mm x 10mm, it saves significant PCB real estate. * **Sealed Construction:** Most A6A models are internally sealed to protect contacts from dust and moisture, ensuring high reliability over time. * **Gold-Plated Contacts:** These parts typically feature gold-plated twin contacts to prevent oxidation and ensure stable electrical resistance. * **Life Expectancy:** Mechanical life is usually rated for 10,000 steps or more. --- ## 4. Common Applications * **Industrial Automation:** Setting unique IDs for sensors or actuators on a bus. * **Telecommunications:** Configuring frequency bands or hardware modes. * **Embedded Systems:** Selecting boot modes or debug levels without reflashing firmware. ---