VSC7398XYU
VSC7398XYU - 8-Port Gigabit Ethernet Switch | Microchip
Microchip Technology VSC7398XYU is an 8-port Gigabit Ethernet switch with integrated PHYs, providing eight tri-speed 10/100/1000 Mbps copper Ethernet ports in a 757-BGA (40x40 mm) package. The device is based on the SparX-G8e enhanced Gigabit Ethernet switching architecture and supports nonblocking wire-speed switching across eight ports. Its copper transceivers are IEEE 802.3ab compliant, allowing the switch to support Gigabit Ethernet links without requiring separate external PHY devices for each copper port.
An Ethernet switch is a networking semiconductor that connects multiple Ethernet endpoints through a shared switching fabric. It inspects incoming Ethernet frames and forwards traffic toward the appropriate destination port, while also handling other Layer 2 functions implemented by the device. The VSC7398XYU sits in the hierarchy of Ethernet interface integrated circuits, network switches, interface ICs, semiconductors, and embedded networking equipment. Integrating the switch function and physical-layer transceivers into one device simplifies hardware design in gateways, industrial controllers, access equipment, and embedded network systems.
The principal verified features are the eight integrated Gigabit Ethernet ports, support for 10, 100, and 1000 Mbps operation, nonblocking wire-speed performance, and IEEE 802.3ab-compliant copper transceivers. All eight ports support copper connectivity through integrated PHYs. This integration reduces the number of separate network interface devices required when several Ethernet connections must terminate on one circuit board. The exact switching fabric throughput, latency, SRAM organization, voltage ratings, and management-interface details are not included in the supplied verified data and therefore require confirmation from the manufacturer datasheet.
The SparX-G8e implementation consolidates switching and transceiver functions within a single highly integrated mixed-signal network IC. This architecture is appropriate for equipment requiring multiple Ethernet ports but limited board space, such as compact access points, industrial communication controllers, and embedded gateways. Because the copper PHYs are integrated, board-level design must account for the device's thermal behavior, high-speed differential routing, magnetics or coupling requirements, controlled impedance, and layout practices specified by Microchip. The supplied data does not provide the complete reference design or pin-level electrical constraints, so those details should be obtained from the official documentation before schematic capture.
Typical applications include eight-port industrial Ethernet switching, embedded control and test systems, telecom access equipment, industrial automation gateways, network appliances, and compact embedded communication platforms. The eight-port configuration is particularly useful when a system must connect controllers, sensors, service equipment, and supervisory computers through isolated Ethernet interfaces. Using a nonblocking, wire-speed switch allows traffic to be aggregated while avoiding the component count of eight standalone Ethernet interface devices.
Designers should obtain the official VSC7398 product brief, datasheet, CAD models, and reference schematic before committing the 757-BGA footprint. The supplied distributor information identifies the package as 757-BGA (40x40), but no verified pinout, power-supply values, maximum copper-cable length, operating-temperature range, or recommended magnetics data were provided. Those parameters must be verified rather than inferred because the Ethernet PHYs, supply rails, clocking, and high-speed copper interfaces determine whether a particular board design will meet system requirements.
This page consolidates the verified manufacturer and distributor findings for the VSC7398XYU, explicitly distinguishes confirmed specifications from missing data, and records the product's NRND status. It also provides engineering-focused application guidance and a source-traceable comparison framework. No unsupported drop-in alternatives, package substitutions, pricing values, pin assignments, or unverified performance claims are presented.
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