VSC8538XHJ - Octal-Port Gigabit Ethernet PHY | Microchip
MPN： VSC8538XHJ ✓ 啟用中VSC8538XHJ 概覽
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.
直接替換替代品，適用於 VSC8538XHJ — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： VSC8538XHJ （相同外形與佔位） — 差異在於 Device Type, Number of Drivers/Receivers, Package.
此產品無可直接替換的替代品。
申請替代品VSC8538XHJ 規格
| 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 |
| 封裝 | 444-pin HS-BGA with exposed pad |
| Package Size | 27 mm |
| Line Driver | Patented low-EMI line driver |
| Termination | Integrated line-side termination |
| 安裝類型 | Surface mount |
| Packaging | Tray |
VSC8538XHJ 27 mm 腳位配置指南
VSC8538XHJ（27 mm 封裝）的腳位配置。 腳位編號、功能與連接圖定義於製造商資料手冊中。請參閱該手冊以取得確切的封裝尺寸與焊接指引。
無詳細腳位定義資料： VSC8538XHJ.
請參閱 資料表 以查看完整腳位配置。
典型應用
VSC8538XHJ 適用於 6 應用s: 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.
推薦
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.
推薦
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.
推薦
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.
推薦
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.
推薦
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.
推薦
推薦產品摘要
工程參考資料，適用於 VSC8538XHJ — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | VSC8512XJG-02 | VSC8504XKS-02 | VSC8211XVW |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
主要差異化特點
- Eight Gigabit Ethernet channels in one package (對比VSC8504XKS-02)
- Integrated line-side termination (對比VSC8512XJG-02)
- Low-EMI line-driver implementation (對比VSC8211XVW)
設計說明
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.
合規資訊
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.
