The term **81663** typically refers to a specific electronic component housing or a part number used by major manufacturers like **Molex** or **TE Connectivity**. In the world of electronics, this number is most commonly associated with **connector housings** and **header systems**. Below is a breakdown of the technical specifications and characteristics of the 81663 series components. --- ### 1. General Overview: 81663 Series Connectors These parts are generally part of the **1.27mm (0.050") Pitch** high-density connector family. They are designed for internal board-to-board or wire-to-board connections where space is a constraint. | Feature | Specification | | :--- | :--- | | **Pitch** | 1.27mm (0.050") | | **Common Type** | Header / Receptacle (SCSI Style) | | **Configuration** | Dual Row (usually 50, 68, or 100 pins) | | **Mounting Type** | Through-hole or SMT (Surface Mount) | | **Application** | High-density data transmission, Computing | --- ### 2. Physical Construction The "81663" series is characterized by its robust physical design to prevent misalignment during mating. - **Housing Material:** High-temperature thermoplastic (LCP or PBT), suitable for reflow soldering. - **Contact Material:** Phosphor Bronze or Copper Alloy. - **Plating:** Gold plating is standard on the contact area to ensure low electrical resistance and prevent corrosion. - **Shielding:** Many versions include metal shielding to reduce Electromagnetic Interference (EMI). --- ### 3. Key Electronic Characteristics These parts are engineered for reliability in high-speed environments. ```yaml Electrical_Properties: Current_Rating: 1.0 Amp per contact Voltage_Rating: 30V AC (rms) / DC Insulation_Resistance: 1000 Megohms Min. Dielectric_Withstanding: 500V AC at sea level Contact_Resistance: 25 Milliohms Max. ``` --- ### 4. Common Variants Depending on the manufacturer (e.g., 3M, Molex), the suffix following "81663" determines the specific configuration: 1. **Right-Angle Headers:** Used for connecting two PCBs at a 90-degree angle. 2. **Vertical Headers:** Used for stacking PCBs or connecting ribbon cables vertically. 3. **Latch/Ejector versions:** Some 81663 parts include locking mechanisms to ensure the cable does not disconnect under vibration. --- ### 5. Applications * **Industrial Automation:** Connecting PLCs to sensory modules. * **Computing:** SCSI interfaces or internal drive connections. * **Networking:** Routers and switches for internal signal routing. * **Medical Equipment:** High-density signal routing in portable diagnostic devices.