The part number **507-059NF04LR** refers to a high-reliability **Micro-D Backshell** manufactured by **Glenair**. While it is not an active electronic component (like a chip), it is a critical mechanical-electronic part used for EMI/RFI shielding and strain relief in D-Subminiature connectors. --- ### Technical Specifications | Feature | Specification | | :--- | :--- | | **Manufacturer** | Glenair | | **Series** | 507 (Micro-D Backshell) | | **Entry Type** | 45-Degree Entry | | **Material / Finish** | Aluminum Alloy / Electroless Nickel (NF) | | **Shell Size** | 04 (Corresponds to 25 Contacts) | | **Hardware Type** | LR (Low Profile Jackscrew, Hex Socket) | | **EMI Shielding** | Yes (Conductive Finish) | --- ### Component Breakdown #### 1. Part Number Deciphering * **507**: The series identifier for Glenair Micro-D backshells. * **059**: Designates the specific body style (45-degree angle cable entry). * **NF**: The finish code. "NF" stands for **Cadmium/Olive Drab over Electroless Nickel**, which provides excellent corrosion resistance and electrical conductivity for shielding. * **04**: The shell size. In the Micro-D world, "04" typically matches a **25-pin** connector layout. * **LR**: The hardware mounting option. "LR" stands for **Low Profile Jackscrew** with a recessed hex head, used to secure the connector to its mate in tight spaces. #### 2. Functional Purpose * **EMI/RFI Protection:** The conductive plating ensures that electrical noise does not escape or enter the cable assembly at the termination point. * **Strain Relief:** It protects the delicate solder or crimp joints of the Micro-D wires from being pulled or damaged. * **Environmental Protection:** Provides a rugged housing for the connector interface in aerospace or defense environments. #### 3. Common Applications Due to its rugged construction and specialized finish, this part is commonly found in: * **Military Avionics:** Flight control systems and radar modules. * **Space Systems:** Satellite wiring harnesses. * **Downhole Drilling:** High-vibration, high-pressure electronic sensors. --- ### Installation Example When assembling this part, the cable shield is typically captured between the backshell halves or secured using a grounding ring to ensure a 360° low-impedance path to ground. ```bash # General Installation Sequence 1. Prepare Micro-D connector (25-pin). 2. Slide backshell over the wire bundle. 3. Terminate wires to connector contacts. 4. Secure backshell to connector body using LR jackscrews. 5. Torque to manufacturer specifications (typically 2.0 - 2.5 inch-pounds). ```