VSC8538XHJ - Octal-Port Gigabit Ethernet PHY | Microchip
Référence : VSC8538XHJ ✓ ActifVSC8538XHJ Présentation
A physical-layer transceiver, or PHY, is the interface between a digital network controller and twisted-pair copper cabling. The PHY performs line encoding, signal shaping, clock recovery, and analog termination while the upper network controller handles packet processing. Within the network interface hierarchy, the VSC8538XHJ sits below the MAC layer and above the physical copper medium, making it suitable for multi-port Ethernet aggregation, access equipment, and industrial switching systems.
The principal feature of the VSC8538XHJ is its octal-port configuration, which integrates eight Gigabit Ethernet channels into one package. The integrated line-side termination removes the need for separate external termination networks on each copper pair, while the patented low-EMI driver is intended to reduce electromagnetic emissions. These features support dense designs where board area, cable-channel count, and EMI performance are important constraints.
The operating supply options of 1.8 V, 2.5 V, and 3.3 V allow the PHY to operate alongside processors, FPGAs, and switching silicon that use different core or I/O voltage levels. Its specified 650 mW consumption in 1000BASE-T mode is a critical thermal figure for multi-port deployments because eight active channels can create substantial aggregate heat in a compact system.
Typical uses include eight-port Gigabit Ethernet switches, network interface controllers, routers, industrial Ethernet equipment, test equipment, and access-aggregation hardware. The 444-HSBGA package provides high pin density for parallel data, clock, control, and power connections, but it also requires careful PCB layout, via-in-pad construction, and thermal management.
For PCB design, use the manufacturer datasheet pin-description table and layout guidance when assigning tracks and thermal vias. Place decoupling capacitors close to the supply pins, provide a low-impedance ground reference, and preserve the high-speed differential routing geometry recommended for 1000BASE-T channels.
This page consolidates package, power, interface, and application information with a parameter-level comparison against related Vitesse and Microsemi Ethernet PHYs. It also identifies the thermal, EMI, and layout considerations that determine whether the octal-port architecture is preferable to fewer discrete PHY channels.
Alternatives de remplacement direct pour VSC8538XHJ — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Variantes de cette série
Modèles de la même série directement compatibles avec VSC8538XHJ (même facteur de forme et même empreinte) — différant par Device Type, Number of Drivers/Receivers, Package.
Aucune alternative de remplacement direct disponible pour ce produit.
Demander des alternativesVSC8538XHJ Spécifications
| Number of Drivers/Receivers | 1/1 |
| Device Type | PHY Transceiver |
| Supported Protocol | Gigabit Ethernet |
| Supported Data Rates | 10 Mbps, 100 Mbps, 1000 Mbps |
| Number of Ports | 8 ports |
| Supply Voltage Options | 1.8 V, 2.5 V, 3.3 V |
| Power Consumption | 650 mW per port in 1000BASE-T mode |
| Boîtier | 444-pin HS-BGA with exposed pad |
| Package Size | 27 mm |
| Line Driver | Patented low-EMI line driver |
| Termination | Integrated line-side termination |
| Type de montage | Surface mount |
| Packaging | Tray |
Guide de configuration des broches du VSC8538XHJ 27 mm
Configuration des broches du VSC8538XHJ (boîtier 27 mm). La numérotation des broches, les fonctions et les schémas de connexion sont définis dans la fiche technique du fabricant. Consultez-la pour l'empreinte exacte et les directives de soudage.
Aucune donnée de brochage détaillée disponible pour VSC8538XHJ.
Consultez la fiche technique pour la configuration complète des broches.
Applications typiques
VSC8538XHJ convient pour 6 applications: Eight-Port Gigabit Ethernet Switch, Industrial Ethernet Gateway, Network Interface Controller, Ethernet Access Aggregation Equipment, Telecommunications Line Card, Network Test Equipment.
Eight-Port Gigabit Ethernet Switch
The VSC8538XHJ fits an eight-port Gigabit Ethernet switch because one 444-pin HS-BGA device integrates eight 10/100/1000BASE-T PHY channels. Its integrated line-side termination and low-EMI driver reduce the external circuitry required around each copper channel. The main engineering constraint is heat: at 650 mW per port in 1000BASE-T mode, eight active channels can dissipate about 5.2 W, so the board needs a thermal-via strategy, adequate copper area, and an enclosure path for heat removal.
Recommandé
Industrial Ethernet Gateway
The VSC8538XHJ can serve an industrial Ethernet gateway that must expose multiple copper network ports while sharing a processor or FPGA data path. Eight integrated PHY channels reduce the number of discrete interface devices compared with separate single-port PHYs. Industrial implementations should follow the manufacturer layout guidance, provide filtered supplies for each voltage domain, and verify temperature requirements because the operating-temperature limits are not established by the product listing.
Recommandé
Network Interface Controller
The VSC8538XHJ is suitable for a parallel network interface controller requiring several independent 10/100/1000BASE-T ports. Its octal-port arrangement allows one physical-layer device to connect multiple copper interfaces to digital controller logic. Because the package contains 444 pins, the controller PCB must provide adequate escape routing from the BGA and a low-impedance ground structure. Validate the required interface protocol, reference clocking, and software register behavior against the manufacturer documentation.
Recommandé
Ethernet Access Aggregation Equipment
The VSC8538XHJ is appropriate for access-aggregation equipment that concentrates multiple 10/100/1000BASE-T services into an uplink. Eight copper channels in one package can simplify line-card density, while integrated line-side termination reduces the component count around each cable interface. The design must still account for connector magnetics, channel skew, return-loss budgets, and the 650 mW per-port power figure when sizing the power supply and thermal path.
Recommandé
Telecommunications Line Card
The VSC8538XHJ can support copper service interfaces on a telecommunications line card where multiple Ethernet rates must be accommodated. Its per-channel support for 10 Mb/s, 100 Mb/s, and 1000 Mb/s allows one physical-layer family to cover access and aggregation links. The 444-pin HS-BGA demands advanced board-assembly capability, while the exposed pad and eight-channel loading make thermal design and supply integrity critical to reliable operation.
Recommandé
Network Test Equipment
The VSC8538XHJ is useful in Ethernet test equipment that must exercise multiple copper links in parallel. Eight independently terminated channels can shorten test cycles by placing several ports under simultaneous traffic. Integrated line-side termination simplifies fixture and board preparation, and the low-EMI driver supports bench and rack-mounted instrumentation. Calibrate channel insertion loss, return loss, and delay against the manufacturer test conditions before using results for production yield decisions.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour VSC8538XHJ — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | VSC8512XJG-02 | VSC8504XKS-02 | VSC8211XVW |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
Principaux différenciateurs
- Eight Gigabit Ethernet channels in one package (vs VSC8504XKS-02)
- Integrated line-side termination (vs VSC8512XJG-02)
- Low-EMI line-driver implementation (vs VSC8211XVW)
Notes de conception
Estimated: eight ports operating at the manufacturer-specified 650 mW per port in 1000BASE-T mode produce 5.2 W of PHY channel power. This is an arithmetic estimate and excludes additional device or board losses. Connect the exposed pad to a thermal-via array and provide sufficient top- and bottom-layer copper, then verify junction temperature in the assembled enclosure rather than relying on ambient temperature alone.
Use the manufacturer land pattern for the 444-pin HS-BGA and follow its recommended escape-routing, via-in-pad, and exposed-pad instructions. The package contains hundreds of connections, so pad density makes impedance control and assembly yield critical. Place supply decoupling close to the relevant pins, preserve a continuous ground reference beneath routed channels, and validate the design with the manufacturer's PCB guidelines before release.
The integrated line-side termination and low-EMI line driver simplify channel implementation, but system-level emissions still depend on connector and magnetics placement. Route each differential pair as a controlled-impedance pair with symmetric geometry, minimize stubs, maintain continuous return paths, and keep noisy switching circuitry away from copper connections. Verify radiated and conducted emissions on the final product because cable and enclosure construction can dominate the result.
Informations de conformité
Compliance attributes require confirmation from the manufacturer product page or declaration documents. Related-family comparison pages may mention RoHS and REACH, but those records do not establish the status of this exact MPN.
