The **LK1-2-R** is a specific electronic component, typically categorized as a **Jumper or Shorting Link** (often manufactured by companies like Harwin). These are used to create a semi-permanent connection between two points on a Printed Circuit Board (PCB). --- ### 1. General Specifications The LK1-2-R is designed to provide a low-resistance path between two pads or pins, often replacing a zero-ohm resistor or a switch where adjustments are rarely needed. | Feature | Specification (Typical) | | :--- | :--- | | **Type** | Solderable Jumper / Shorting Link | | **Material** | Phosphor Bronze or Copper Alloy | | **Plating** | Tin (indicated by the "-R" suffix in some catalogs) | | **Current Rating** | Up to 10A (depending on trace width) | | **Mounting Type** | Surface Mount (SMD) or Through-Hole | --- ### 2. Key Electronic Functions The LK1-2-R serves three primary roles in electronic design: 1. **Circuit Configuration:** Used to select hardware options (e.g., setting a device ID or selecting between 3.3V and 5V rails) without needing a physical DIP switch. 2. **Service Links:** It acts as a "break-point" in a circuit. An engineer can remove the link to isolate a sub-circuit for troubleshooting or current measurement. 3. **Programming/Mode Selection:** Often found on development boards to enable or disable "Bootloader" modes. --- ### 3. Physical Attributes * **Dimensions:** These are extremely small components, often designed to bridge a 2.54mm (0.1 inch) pitch gap. * **The "-R" Suffix:** In many electronics naming conventions, "R" signifies **RoHS Compliance**, meaning the part is free from lead and other hazardous substances. * **Form Factor:** It is essentially a "staple-shaped" wire or a flat metal stamping that is soldered directly to the board. --- ### 4. Comparison with Alternatives | Component | Permanence | Cost | Space | | :--- | :--- | :--- | :--- | | **LK1-2-R Jumper** | Semi-Permanent | Very Low | Minimal | | **DIP Switch** | Easily Changed | High | Large | | **0Ω Resistor** | Permanent | Very Low | Minimal | | **Header + Shroud** | Easily Changed | Medium | Tall |