The **JS0208FP4-R** is a specific electronic component belonging to the **DIP (Dual In-line Package) Switch** category, manufactured by **C&K Components** (now part of Littelfuse). It is a low-profile, surface-mount slide switch typically used for configuration settings on printed circuit boards (PCBs). --- ## 1. Technical Specifications The following table outlines the key electrical and physical parameters of the device: | Feature | Specification | | :--- | :--- | | **Switch Type** | DIP / Slide | | **Number of Positions** | 8 | | **Actuator Level** | Flush (Recessed) | | **Circuit** | SPST (Single Pole Single Throw) x 8 | | **Current Rating** | 25mA @ 24VDC (Switching) / 100mA (Steady State) | | **Mounting Type** | Surface Mount (SMT), Gull Wing | | **Pitch** | 1.27mm (Half-Pitch) | | **Operating Temperature** | -40°C to +85°C | --- ## 2. Key Component Features ### Half-Pitch Design Unlike standard DIP switches that use a 2.54mm (0.1 inch) pitch, the JS0208FP4-R utilizes a **1.27mm (0.05 inch) pitch**. This makes it ideal for high-density electronic assemblies where board space is at a premium. ### Flush Actuator The "FP" in the part number indicates a **Flush Actuator**. The slides are recessed within the housing, preventing accidental switching. This design usually requires a small tool (like a stylus or pen tip) to toggle the positions. ### Materials and Durability * **Housing:** High-temperature thermoplastic (UL94V-0), capable of withstanding SMT reflow soldering temperatures. * **Contacts:** Gold over nickel plating to ensure high reliability and resistance to oxidation over time. * **Mechanical Life:** Typically rated for 1,000 to 2,000 cycles. --- ## 3. Pinout and Layout Example Since it is an 8-position SPST switch, it has 16 pins in total (8 inputs and 8 outputs). ```text Top View (1.27mm Pitch) _______________________ | 1 2 3 4 5 ...| <-- Terminals | [ ] [ ] [X] [ ] [X] | <-- Flush Sliders |__8___7___6___5___4__| ``` --- ## 4. Common Applications This part is commonly found in industrial and consumer electronics for: * **Address Setting:** Assigning IDs to devices on a communication bus (e.g., RS-485 or CAN). * **Configuration:** Selecting operation modes or frequency bands on wireless modules. * **Safety/Security:** Enabling or disabling specific hardware features on a motherboard.