The 2.54mm Ejector Header SMT is a shrouded male pin header connector designed for reliable board-to-wire connections in applications requiring secure mating and easy disengagement. As an "Ejector Header" or "Shrouded Ejector Header," this component features a polarized plastic housing that surrounds the male pins, providing mechanical protection against damage and preventing incorrect mating with female IDC sockets or other compatible receptacles. The defining characteristic of this header family is the inclusion of ejector latches or ejector mechanisms on both ends of the connector body. These ejectors serve a dual purpose: when engaged, they lock the mating IDC socket securely in place to prevent accidental disconnection due to vibration or shock; when actuated, they provide a mechanical advantage to gently and evenly separate the socket from the header without stressing the pins or solder joints. This makes the ejector header particularly valuable in applications where cables are frequently connected and disconnected, such as test fixtures, prototyping systems, or field-serviceable equipment.

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The defining characteristic of this model is its 2.54mm (0.100") pitch, which is the industry-standard spacing inherited from legacy DIP (Dual In-line Package) and ribbon cable systems, ensuring broad compatibility with a wide range of mating IDC sockets and flat ribbon cables. This pitch offers a robust balance between contact density and electrical performance, with sufficient spacing to prevent signal interference while maintaining ease of manual assembly. The header is available in both Straight (Vertical/180°) and Right Angle (90°) orientations. The Straight orientation has pins projecting perpendicularly from the PCB surface, making it ideal for applications where the mating cable must be inserted vertically, such as in stacked board configurations or standard ribbon cable connections. The Right Angle orientation has pins exiting parallel to the PCB surface, making it suitable for compact enclosures or edge-card applications where board space is at a premium. The H=5.75mm specification (or similar standard heights) refers to the insulator height from the PCB mounting surface to the top of the housing, providing a standardized profile that ensures compatibility with mating connectors. This connector is offered in Surface Mount Technology (SMT) termination, which supports automated pick-and-place assembly and reflow soldering processes, reducing manufacturing costs compared to through-hole variants.

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Electrical characteristics of the 2.54mm Ejector Header SMT typically include a current rating of 2.0 to 3.0 Amps per contact, insulation resistance of 1000MΩ minimum, contact resistance of 20mΩ maximum, and a withstand voltage of 500V AC/DC. The wide operating temperature range spans from -40°C to +105°C (or up to +125°C for high-performance grades), making this connector suitable for industrial control systems, telecommunications equipment, computer peripherals, instrumentation, and consumer electronics. The housing is molded from high-temperature thermoplastics such as LCP (Liquid Crystal Polymer) or PA6T (Polyamide 6T) with glass fiber reinforcement, rated UL94 V-0 for flame retardancy, ensuring excellent mechanical strength and heat resistance during reflow soldering processes. The contacts are fabricated from brass or phosphor bronze with selective gold or tin plating over nickel to ensure low contact resistance, corrosion resistance, and durability through multiple mating cycles. The ejector latches are typically made of glass-filled PBT or similar rigid materials, providing robust mechanical performance over thousands of actuation cycles.

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Many versions of the 2.54mm Ejector Header SMT also feature polarization slots or guide ribs for accurate placement during automated assembly, and optional mounting pegs or board locks provide secure retention to the PCB prior to soldering. The ejector mechanism itself often includes audible or tactile click feedback to confirm proper locking engagement. Major manufacturers of this connector type include Samtec (EJH Series), TE Connectivity (AMP-LATCH Series), and HARTING (SEK-18 Series), each offering variations in ejector design, plating options, and packaging formats such as Tape and Reel for high-volume SMT assembly. In summary, the 2.54mm Ejector Header SMT is a robust, user-friendly interconnect solution that combines reliable electrical performance with mechanical latching and ejection functionality. Its SMT termination supports modern automated assembly processes, while the ejector mechanism enhances serviceability and connector longevity, making it an industry standard for applications requiring frequent mating and unmating of IDC ribbon cable assemblies.