The **RTF-16-R0AR** is a specific model of a **Rotary Coded Switch** (DIP Switch style) manufactured by companies like **Copal Electronics** (now Nidec Components). It is commonly used in industrial control panels, telecommunications, and circuit board configuration. --- ## 1. Technical Specifications The "16" in the part number indicates it is a **Hexadecimal** switch, providing 16 distinct positions (0-9 and A-F). | Feature | Specification | | :--- | :--- | | **Number of Positions** | 16 (Hexadecimal) | | **Output Code** | Real Code (Binary Coded Hexadecimal) | | **Actuator Type** | Flat Slot (Flush) or Knob | | **Terminal Type** | Through-hole (Right Angle) | | **Contact Rating** | 100mA @ 5V DC (Switching) / 100mA @ 50V DC (Non-switching) | | **Operating Temperature** | -25°C to +70°C | | **Rotational Torque** | 20 mN·m | --- ## 2. Pin Configuration and Truth Table The device converts the physical position of the dial into a 4-bit Binary Coded Hexadecimal (BCH) output. It typically has 5 pins: one **Common (C)** pin and four **Data (1, 2, 4, 8)** pins. ### Hexadecimal Truth Table | Dial Position | Pin 1 (2⁰) | Pin 2 (2¹) | Pin 4 (2²) | Pin 8 (2³) | | :---: | :---: | :---: | :---: | :---: | | **0** | OFF | OFF | OFF | OFF | | **1** | **ON** | OFF | OFF | OFF | | **7** | **ON** | **ON** | **ON** | OFF | | **9** | **ON** | OFF | OFF | **ON** | | **F** | **ON** | **ON** | **ON** | **ON** | --- ## 3. Key Electronic Components & Materials * **Contacts:** Usually gold-plated to ensure low contact resistance and prevent oxidation over long periods of inactivity. * **Housing:** High-temperature plastic (often PPS or PBT) to withstand wave soldering. * **Rotor:** The internal mechanical disc that bridges the common pin to the specific output pins based on the physical angle. * **Sealing:** These units are often "washable," meaning they have an O-ring or epoxy seal to allow board cleaning after soldering without damaging the internals. --- ## 4. Part Number Breakdown: RTF-16-R0AR * **RTF:** Series name (Rotary Coded Switch). * **16:** Number of positions (16 = Hexadecimal). * **R:** Code type (R = Real Code; C = Complementary Code). * **0:** Actuator style (0 = Flat/Flush type). * **A:** Terminal pin shape (A = Right Angle / Side entry). * **R:** Packaging (R = RoHS Compliant / Tray or Reel). ---