The **M2RS1-40-R** typically refers to a high-density, square-post male header strip (often associated with manufacturers like Sullins Connector Solutions or Samtec equivalents). It is a fundamental passive component used to create electrical connections between two Printed Circuit Boards (PCBs) or between a cable and a PCB. --- ### 1. Key Technical Specifications | Parameter | Specification | Details | | :--- | :--- | :--- | | **Component Type** | Male Header / Pin Header | Unshrouded, straight orientation | | **Pitch** | 2.00 mm (0.079") | Smaller than the standard 2.54mm pitch | | **Number of Rows** | 2 Rows (Dual Row) | "2R" or "2" in prefix usually denotes rows | | **Total Pins** | 40 Pins | Arranged in a 2x20 configuration | | **Mounting Type** | Through-Hole (THT) | Pins pass through the board for soldering | | **Contact Material** | Phosphor Bronze / Brass | Usually gold or tin plated | | **Termination** | Right Angle (R) | The "R" suffix indicates a 90-degree bend | --- ### 2. Breakdown of Part Number Logic While specific vendors vary slightly, the nomenclature generally follows this pattern: * **M2**: Series designation (2.00mm pitch series). * **RS1**: Row spacing or specific insulator material (e.g., Nylon 6T or PBT). * **40**: Total pin count (20 pins per row). * **R**: **Right Angle.** This means the pins exit the side of the connector, allowing for horizontal board-to-board mating or "edge" connections. --- ### 3. Physical & Electrical Characteristics #### Electrical * **Current Rating:** Typically **2A per contact**. * **Insulation Resistance:** 5000 MΩ minimum. * **Dielectric Withstanding Voltage:** 500V AC at sea level. * **Contact Resistance:** 20 mΩ maximum. #### Mechanical * **Operating Temperature:** -40°C to +105°C (standard) or +125°C for high-temp versions. * **Profile:** Low-profile design to save vertical space in compact electronics. --- ### 4. Common Applications 1. **Embedded Systems:** Connecting a microcontroller "shield" or daughterboard to a mainboard. 2. **Industrial Controllers:** Used in PLCs where vertical space is limited, requiring right-angle headers. 3. **Consumer Electronics:** Found inside routers, modems, and IoT devices for debugging ports or internal expansion. 4. **Ribbon Cable Interface:** Mates with 2.00mm pitch female IDC sockets. ---