The part number **641778-1** refers to a specific electrical connector component manufactured by **TE Connectivity (formerly AMP)**. It is a header assembly belonging to the **MTA-156 (Mass Termination Assembly)** product family. --- ### ## Technical Specifications Below is a summary of the key electrical and physical characteristics of the 641778-1: | Property | Specification | | :--- | :--- | | **Connector Type** | Header, Shrouded (Friction Lock) | | **Contact Gender** | Male (Pins) | | **Number of Positions** | 8 | | **Pitch (Spacing)** | 3.96mm (0.156 in) | | **Mounting Type** | Through Hole, Vertical | | **Voltage Rating** | 600 VAC | | **Current Rating** | 7.0 Amperes | | **Contact Plating** | Tin | | **Housing Material** | Nylon (UL 94V-0 Rated) | --- ### ## Key Features 1. **Friction Lock:** The "1" at the end of the base part number often signifies specific configurations. This model includes a locking ramp that ensures the mating female connector stays securely attached under vibration. 2. **Polarization:** The housing is designed to prevent accidental reverse mating with the corresponding socket. 3. **MTA-156 Series Compatibility:** This header is designed to mate with MTA-156 IDC (Insulation Displacement Connector) or crimp-style female connectors. It is widely used for power and signal transmission in industrial and consumer electronics. --- ### ## Common Applications * **Power Supplies:** Used as an output header for internal power distribution. * **Industrial Controls:** Connecting sensors or actuators to a main PCB. * **Appliances:** Internal wiring harnesses for white goods (washers, dryers). * **Vending Machines:** Robust enough for the high-current demands of motors and coin mechs. --- ### ## Schematic Representation If you are adding this to a PCB design software (like Altium, KiCad, or Eagle), use the following footprints: ```text Library Name: TE_641778-1 Footprint: HDRV8W64P396_1X8_3175X450X1000P Pin Configuration: Pin 1: Square Pad (Indicator) Pins 2-8: Round Pads ```