PEX8604-BA50BC - 4-Port PCIe Gen 2 Switch | Broadcom
MPN： PEX8604-BA50BC ✓ 啟用中PEX8604-BA50BC 概覽
A PCI Express switch is a semiconductor device that expands one host interface into multiple PCIe connections. Its hierarchy is PCI Express switch, interface IC, semiconductor, and computer connectivity component. By routing traffic among a root complex and multiple endpoints, the switch reduces the need for separate host controllers while preserving the transaction-based PCIe architecture.
Key characteristics include four Gen 2 lanes, up to four ports, 5.0 GT/s signaling, and a 15 x 15 mm BGA footprint. The PEX 8604 family also supports hot-plug controllers for downstream slots, allowing supported modules to be replaced or serviced without powering down the complete system. Its compact package supports constrained consumer, embedded, and expansion systems.
The device follows the PCI Express Base Specification Revision 2.0 and uses a four-lane, four-port topology. This architecture is suited to systems that need fan-out from a host bus to storage, networking, capture, or accelerator endpoints. Exact lane allocation, auxiliary power behavior, reference-clock requirements, and register-level programming details should be confirmed in the manufacturer PEX 8604 BA Data Book before schematic capture.
Typical uses include embedded platforms, industrial controllers, set-top equipment, test systems, and high-availability servers that connect several PCIe endpoints through one switch. Hot-plug support is particularly useful when downstream adapter cards must be maintained while the host remains operational. The four-port topology also permits unused ports to remain unpopulated, depending on the board design and validation results.
The primary PCB consideration is the 196-ball BGA layout. Use the manufacturer package drawing, pinout, reference design, and layer-stack guidance for escape routing, power distribution, and reference-clock implementation. Do not infer BGA ball assignments from the distributor category labels because the switch is a complex interface IC rather than a conventional analog switch.
This page organizes the confirmed device specifications, official documentation links, application guidance, design considerations, and available substitution findings into one engineering reference. It also distinguishes genuine same-footprint replacements from related PCIe switches that are not verified as drop-in compatible.
直接替換替代品，適用於 PEX8604-BA50BC — 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。
此產品無可直接替換的替代品。
申請替代品PEX8604-BA50BC 最大額定值與電氣特性
| Product Type | PCI Express Switch IC |
| PCI Express Generation | Gen 2 |
| Maximum Data Rate | 5.0 GT/s |
| PCI Express Lane Count | 4 lanes |
| Maximum Port Count | 4 ports |
| PCI Express Specification Revision | Revision 2.0 |
| Channel Count | 4 channels |
| 封裝 | 196-BGA |
| Package Dimensions | 15 x 15 mm |
| 安裝類型 | Surface mount |
| Hot-Plug Support | Yes |
| RoHS Compliance | RoHS3 compliant |
| Manufacturer | Broadcom Limited |
| Product Family | ExpressLane PEX 8604 |
| 拓撲 | 4-lane, 4-port |
PEX8604-BA50BC 15 x 15 mm 腳位配置指南
PEX8604-BA50BC（15 x 15 mm 封裝）的腳位配置。 此類比元件具有輸入、輸出與電源腳位。偏移歸零、補償與致能腳位配置請參閱製造商資料表。適用於訊號調理與放大器電路。
無詳細腳位定義資料： PEX8604-BA50BC.
請參閱 資料表 以查看完整腳位配置。
典型應用
PEX8604-BA50BC 適用於 6 應用s: Embedded PCIe Expansion, Industrial Data Acquisition, Network Appliance Expansion, High-Availability Server, PCIe Storage System, Test and Measurement System.
Embedded PCIe Expansion
The PEX8604-BA50BC fits embedded platforms that must fan a host connection out to multiple PCI Express endpoints. Its four Gen 2 lanes, support for up to four ports, and 5.0 GT/s signaling provide a defined PCIe topology without requiring four independent host resources. The 15 x 15 mm 196-BGA package helps conserve board area in compact controllers, but the design must follow the manufacturer escape-routing and reference-clock guidance. Port assignments and unused lanes should be validated against the final endpoint population and firmware requirements.
Industrial Data Acquisition
The PEX8604-BA50BC can support industrial data-acquisition systems that combine multiple PCIe adapters behind one host interface. Four upstream or downstream lanes and as many as four ports allow measurement, digitizer, and communication cards to share a structured PCIe fabric. The Gen 2 rate of 5.0 GT/s is appropriate for many instrumentation workloads, while hot-plug support can simplify maintenance when downstream modules are designed for controlled removal and insertion. Validate operating-temperature, vibration, isolation, and board-level EMC requirements separately.
Network Appliance Expansion
Network appliances can use the PEX8604-BA50BC to add PCIe-attached networking or storage controllers beyond the capabilities of the base platform. The four-port topology supports a combination of endpoint types while keeping the PCIe traffic behind a standardized switch. Hot-plug capability may assist in maintenance-oriented systems, provided the downstream port, power-delivery path, and management software support safe removal. The switch should be placed according to the manufacturer reference design so that clocking, power sequencing, and trace geometry maintain Gen 2 signal integrity.
High-Availability Server
The PEX8604-BA50BC is suited to high-availability server and modular-system designs that use downstream PCIe slots. Broadcom documents hot-plug controller capability for supported downstream ports, allowing qualified modules to be replaced without powering down the complete system. The four-lane, four-port arrangement can connect multiple adapters while preserving a common Gen 2 fabric. A production design must implement the required power-state transitions, connector controls, software enumeration, and fault isolation around each hot-plug port rather than treating hot-plug as a connector-only feature.
PCIe Storage System
The PEX8604-BA50BC can serve as the routing element in a PCIe storage system connecting multiple controllers or adapters to a host processor. Four Gen 2 lanes at up to 5.0 GT/s provide a consistent fabric for widely adopted enterprise and embedded storage adapters. Multiple ports also permit separate endpoint controllers to operate behind one switch instead of consuming separate host lanes. Storage performance still depends on endpoint bandwidth, transaction routing, DMA behavior, and host software; a switch cannot compensate for an endpoint whose throughput is below the system requirement.
Test and Measurement System
The PEX8604-BA50BC can connect several PCIe-based measurement, signal-processing, or capture endpoints to a common host controller in a test system. Its four-port architecture simplifies expansion while the compact 196-BGA footprint supports multi-board instrument designs. Hot-plug support can improve serviceability when the instrument architecture permits controlled module replacement. For precision applications, pay particular attention to reference-clock distribution, lane equalization, power sequencing, and enclosure grounding, because the switch provides connectivity but does not eliminate the channel-level integrity requirements of each PCIe endpoint.
工程參考資料，適用於 PEX8604-BA50BC — 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 |
|---|---|
| Brand | Broadcom |
| Package | 196-BGA (15 x 15 mm) |
| PCI Express Generation | Gen 2 |
| Maximum Data Rate | 5.0 GT/s |
| Lane Count | 4 lanes |
| Maximum Port Count | 4 ports |
| Specification Revision | PCI Express Base Specification Revision 2.0 |
| Hot-Plug Support | Yes |
| RoHS Status | RoHS3 compliant |
主要差異化特點
- Compact four-port PCIe Gen 2 switching function (對比PEX8606-BA50BC)
- Explicit hot-plug capability for supported downstream slots (對比PEX8617-BA50BCG)
- Gen 2 four-lane architecture instead of assuming Gen 3 compatibility (對比PI3HDX1204EZLEX)
設計說明
Treat the 196-BGA land pattern as a high-speed differential routing problem rather than a generic BGA escape exercise. Follow the manufacturer package drawing and reference design for ball assignments, layer transitions, via geometry, return paths, and plane connections. Confirm each lane's reference and ground-plane treatment against the PEX 8604 BA Data Book before releasing the PCB because small routing changes can affect Gen 2 signal integrity.
Separate the switch's core, I/O, and auxiliary supply paths according to the manufacturer power architecture. Review sequencing, current limits, inrush behavior, and downstream hot-plug power delivery in the data book. Use the specified bypass-capacitor network and placement exactly; placing bulk capacitance at the connector rather than at the relevant BGA power balls can allow the switch supply to move outside its intended operating range during system startup.
Implement the reference clock as a controlled, low-jitter source and follow the manufacturer's clock-routing and termination guidance. Keep the clock away from high-speed data lanes where practical, provide continuous reference planes beneath pairs, and validate lane-to-pad transitions with the intended board stack-up. PCIe link training may complete at reduced margins if clock noise, package-transition discontinuities, or return-path discontinuities are not controlled.
Do not classify a related PCIe switch as a drop-in replacement solely because it has a similar BGA package or lane count. The PI3HDX1204EZLEX is explicitly described as not being a direct replacement for the PEX8604-BA50BC, and comparison listings for PEX8606 and PEX8617 do not establish identical ball assignments, power sequencing, or register behavior. Verify the manufacturer pinout, electrical limits, firmware expectations, and reference design before substitution.
合規資訊
The product listing identifies the PEX8604-BA50BC as RoHS3 compliant. Other compliance declarations were not established.
