The part number format **121-XXX-R** is a specific nomenclature used primarily by **Kycon**, a leading manufacturer of I/O connectors. Specifically, this series refers to **D-Subminiature (D-Sub) connectors** with a high-profile, right-angle board mount design. --- ### 1. Part Number Breakdown To understand a specific component, you must decode the segments of the part number: | Segment | Meaning | Description | | :--- | :--- | :--- | | **121** | Series Number | Represents Kycon's Right Angle, High Profile D-Sub series. | | **XXX** | Pin Count/Gender | Defines the number of pins (e.g., 009, 015, 025) and the gender (Male/Female). | | **-R** | RoHS Compliance | Indicates the part is lead-free and meets RoHS environmental standards. | ### 2. Physical Characteristics These connectors are designed for **Through-Hole** mounting on Printed Circuit Boards (PCBs). * **Footprint:** Often a .318" or .590" footprint (distance from the edge of the board to the first row of pins). * **Mounting Type:** Right-Angle (90 degrees), allowing the cable to be plugged in parallel to the PCB. * **Shell Material:** Usually Tin-plated steel for EMI/RFI shielding. * **Insulator:** PBT thermoplastic (UL94V-0 rated). ### 3. Technical Specifications Common electrical and mechanical ratings for the 121 series include: | Parameter | typical Rating | | :--- | :--- | | **Current Rating** | 5 Amperes | | **Dielectric Strength** | 1000V AC for 1 minute | | **Insulation Resistance** | > 5000 Megohms | | **Contact Resistance** | < 15 Milliohms | | **Operating Temp** | -55°C to +105°C | ### 4. Common Variations The "XXX" placeholder is typically replaced by these common configurations: * **121-009-R**: 9-pin (Standard Serial Port) * **121-015-R**: 15-pin (Standard VGA/Game Port) * **121-025-R**: 25-pin (Standard Parallel Port) --- ### 5. Implementation Example If you were defining this part in a Bill of Materials (BOM) or footprint software, you might use these parameters: ```yaml Component: D-Sub Connector Manufacturer: Kycon Series: 121 Mounting: PCB Right Angle Plating: Gold Flash (Standard) Compliance: RoHS ```