Molex KK Connectors

Molex KK Interconnection System consists of connectors that form the building block for creating thousands of different configurations. This system offers polarization features that ensure correct mating. The system incorporates offset header entry holes that provide +180°C polarization and allows both power and signal to carry through the same housing. This connector system also enables loading with optional polarization keys and pegs that ensure the one-way mating of headers and housings. Molex KK Interconnection System comes with customizable KK headers that offer more polarization options and design configurations. These include headers with voided pins, customized pin lengths, kinked PC tails, and varying tin or gold plating options.

Molex Reflow Process Compatible (RPC) headers are available in both signal and power applications and handle up to 260°C solder temperature. The signal application KK 254 connectors deliver up to 5A and 250V per circuit in a 2.54mm centerline pitch. The KK 396 connectors deliver 13A and 600V per circuit in a 3.96mm centerline pitch.


  • Friction lock headers and friction lock ramp housings
  • Polarizing back walls, housings, and pegs
  • Kinked PC tails
  • Various terminal designs with extra contact points
  • Vertical and right-angle headers
  • Top, bottom, and right-angle PCB receptacles
  • Ensures secure mating
  • Prevents mismating
  • Ensures good contact with the PCB
  • Ideal for high-vibration environments
  • Design flexibility


  • Automotive
    • Control modules
    • Interior lighting
    • Side/back window defrosters
    • Stereos
  • Consumer
    • Coin changers
    • Fire alarms/smoke detectors
    • Gaming machines
    • Garage doors
    • Home appliances
    • Home security
    • Lottery machines
    • Scoreboards
    • Set-top boxes
    • Slot and gaming consoles
    • Vending machines
    • White goods
  • Industrial Automation
    • Automation equipment
  • Data/communications
    • Copiers
    • Desktop computers and motherboards
    • Mainframes
    • Multi-function scanners
    • Power stations
    • Printers
    • Workstations
  • Medical
    • Blanket warmers
    • Blood warming bags
    • Heart monitors
    • Patient monitors
    • Pulse oximeters
    • Respirators
  • Networking
    • 1U rack boxes
    • Blade servers
    • Rack-mount servers


Power Products

Chart - Molex KK Connectors
Published: 2012-06-01 | Updated: 2022-10-31