JST GH to RJ45 Ethernet Cable – 4-Pin, 20 cm - 100Mbit

This compact Ethernet cable is intended for embedded 100BASE-TX applications where space and connector size are constrained. It interfaces a JST GH 4-pin (1.25 mm pitch) Ethernet PHY header to a standard RJ45 (8P8C) Ethernet port. The cable is suitable for short-distance, low-noise environments such as laboratory setups, drones, or internal system wiring. Technical Description Ethernet Standard: 100BASE-TX (IEEE 802.3u) Transmission Speed: 100 Mbit/s (full or half duplex) Cable Length: 200 mm ±5 mm Cable Type: Unshielded, custom-terminated Impedance Matching: Not controlled (intended for ≤30 cm use) Twisting: R+/R− and T+/T− signals are individually twisted as differential pairs Connector A: JST GH 4-pin (horizontal mount, 1.25 mm pitch) Connector B: RJ45 (8P8C), standard Ethernet plug, T568B-compatible mechanical interface Signal Pinout (Fixed) RJ45 Pin Signal JST GH Pin Wire Color 1 TX+ 4 White 2 TX− 3 Green 3 RX+ 1 White 6 RX− 2 Red RJ45 pins 4, 5, 7, and 8 are left unconnected (NC). Intended Use Embedded systems with Ethernet PHY routed to JST GH header Drones, sensor systems, and compact robotic platforms Ethernet breakout or adapter cable for internal assemblies Board-to-port bridging in test setups or low-noise enclosures Assembly Notes Each differential pair (TX and RX) is individually twisted to reduce intra-pair skew and minimize crosstalk Not suitable for PoE (Power over Ethernet) Crimped and continuity-tested for reliability Lightweight and flexible for constrained routing paths