The **KASD-41-R** is a specific model of a **Miniature Low Profile DIP Switch** manufactured by components companies like **Kingbright** or **Excel Cell Electronic (ECE)**. It is designed for PCB (Printed Circuit Board) mounting to manually control the logic states of electronic circuits. --- ## 1. Technical Specifications Below are the primary electrical and mechanical characteristics of the KASD-41-R: | Parameter | Specification | | :--- | :--- | | **Switch Type** | DIP (Dual In-line Package) | | **Number of Positions** | 4 Positions (4 individual switches) | | **Actuator Type** | Recessed (Flush with the housing) | | **Contact Rating (Switching)** | 25mA, 24V DC | | **Contact Rating (Non-Switching)** | 100mA, 50V DC | | **Insulation Resistance** | 100MΩ Min. at 500V DC | | **Operating Temperature** | -20°C to +85°C | | **Mounting Type** | Through-Hole (THT) | --- ## 2. Key Features The "R" suffix and the series prefix denote specific design choices: * **Low Profile:** The "recessed" actuator means the switches do not protrude above the plastic housing. This prevents accidental switching and allows for a slim device profile. * **Gold-Plated Contacts:** Ensures high reliability and prevents oxidation, which is critical for low-voltage logic signals. * **Tape Sealed (Optional):** Many "R" models come with a top tape seal, allowing them to withstand wave soldering and aqueous cleaning processes without internal contamination. * **Standard Pitch:** Uses a 2.54mm (0.1 inch) pitch, making it compatible with standard breadboards and universal PCBs. --- ## 3. Circuit Symbol and Operation Each of the 4 switches operates as a simple **SPST (Single Pole Single Throw)** toggle. ```text [ OFF ] |---O O---| <-- Internal Contact Open [ ON ] |---O-O---| <-- Internal Contact Closed ``` ### Common Applications 1. **Address Setting:** Setting unique IDs for devices on a communication bus (like RS-485 or DMX). 2. **Configuration:** Enabling or disabling specific features on a motherboard or industrial controller. 3. **Security Codes:** Setting manual bypass codes or frequency channels in RF remotes. --- ## 4. Part Number Breakdown (KASD Series) * **KA:** Series prefix (often associated with Kingbright/ECE). * **S:** Slide type actuator. * **D:** Dual In-line package. * **4:** 4 independent switch circuits. * **1:** Standard profile or specific revision code. * **R:** **Recessed Actuator** (flush) and often implies RoHS compliance.