The part number **507T175NF1501** refers to a high-performance **Micro-D Backshell** manufactured by **Glenair**. These components are critical in aerospace and defense electronics for providing strain relief and EMI/RFI shielding for D-Subminiature connectors. --- ### 1. Part Number Breakdown To understand the electronic and mechanical properties, we can decode the Glenair nomenclature: | Segment | Value | Description | | :--- | :--- | :--- | | **Series** | 507 | Micro-D Backshell, Top Entry | | **Basic Part No.** | T175 | EMI/RFI Shielding, Integrated Banding Porch | | **Finish Code** | NF | Cadmium, Olive Drab over Electroless Nickel (Conductive) | | **Shell Size** | 15 | Fits 15-contact Micro-D Connectors | | **Hardware** | 01 | Fillister Head Jackscrew (Non-locking) | --- ### 2. Technical Specifications This part is designed to meet or exceed the requirements of **MIL-DTL-83513**. * **Material:** Aluminum Alloy (6061-T6). * **Conductivity:** The "NF" finish is highly conductive, ensuring low-resistance paths for EMI/RFI signals to ground. * **Corrosion Resistance:** Rated for 500 hours of salt spray. * **Entry Style:** Top entry (wires exit straight out the back of the connector). * **Attachment Method:** Features a "Banding Porch" for use with stainless steel Micro-Bands to secure the cable shield. --- ### 3. Key Electronic Functions While the backshell itself is a mechanical housing, it performs several essential electronic roles: #### A. EMI/RFI Shielding Electronic signals in high-density Micro-D connectors are susceptible to interference. The backshell acts as a Faraday cage, preventing external electromagnetic interference (EMI) from disrupting data and preventing the cable's own radio frequency interference (RFI) from leaking out. #### B. Grounding The conductive plating ensures a continuous electrical path from the cable shield to the connector shell and ultimately to the chassis ground. #### C. Environmental & Mechanical Protection * **Strain Relief:** Prevents solder joints or crimp contacts from breaking under vibration. * **Physical Protection:** Guards the delicate rear-end wiring of the Micro-D connector from physical damage. --- ### 4. Common Applications * **Aerospace:** Satellite bus systems and cockpit instrumentation. * **Defense:** Man-portable communication devices and missile guidance systems. * **Industrial:** High-vibration sensors and down-hole drilling equipment.