The TE Connectivity 5557563-1 is a 5-port modular jack with an 8P8C (RJ45) interface, right-angle orientation, and through-hole mounting. It sits in TE's broad modular jack family, unshielded and without integrated LEDs, targeting cost-sensitive multiport Ethernet applications where EMI containment is handled at the system level rather than the connector. The Cat4 rating means it is specified for data rates up to 20 MHz — sufficient for legacy Ethernet (10BASE-T) and ISDN, but not for 100BASE-TX or Gigabit signaling.
Pinout, Orientation, and Board Fit
The 8P8C pinout follows standard wiring; the right-angle mounting places the jack parallel to the PCB, and the tab-down orientation means the locking tab on the plug faces the board when mated.
Cat4 Rating vs. Faster Ethernet
The Cat4 rating is the limiting spec for data throughput. Cat4 supports a maximum frequency of 20 MHz, enough for 10BASE-T and ISDN but not for 100BASE-TX (Cat5, 100 MHz) or Gigabit Ethernet (Cat5e/Cat6, 125+ MHz). For 10BASE-T or voice-only runs, the 5557563-1 is a functional fit at lower cost than a Cat5 rated jack.
No last-time-buy window is on record. No official cross-reference or second-source number is listed in the product documentation.