USB2503A-HZE - USB 2.0 3-Port Hub Controller | Microchip
MPN： USB2503A-HZE ✓ 啟用中USB2503A-HZE 概覽
A USB hub controller is a system semiconductor that bridges one upstream USB port to multiple downstream ports while implementing the electrical, protocol, and power-management behavior defined by USB. The USB2503A belongs to the USB interface-controller hierarchy, where USB interface ICs manage host, device, or hub connectivity and help organize peripherals into a tiered USB topology.
The principal documented features include USB 2.0 compliance, three downstream ports, three transaction translators, and support for high-speed, full-speed, and low-speed devices. The hub does not require firmware development, which can simplify product integration and reduce the software validation burden. Its 48-QFN package also supports compact multilayer PCB layouts, although exposed-pad thermal management and careful high-speed layout remain important.
Dynamic power switching allows the controller to monitor the external SELF_PWR signal and detect changes in local power availability. When the power source changes, the hub disconnects downstream devices and the upstream port before reconnecting as either a bus-powered or self-powered hub according to the available power configuration. This behavior helps prevent devices from receiving inadequate current during source transitions.
The SMBus configuration interface uses the SDA/SMBDATA and SCL/SMBCLK/CFG_SELO lines. The manufacturer datasheet requires external pull-up resistors, with 10 kΩ recommended, from those lines to VCC. Designers should follow the SMBus 1.0 Specification and applicable EEPROM manufacturer guidance when the configuration EEPROM is used.
Typical installations include USB docking stations, desktop peripherals, embedded host systems, industrial equipment, and multi-device USB hubs. Application selection must account for upstream and downstream cable length, bus-powered load limits, self-powered operation, EEPROM configuration, and high-speed signal integrity. The available distributor pricing starts at $1.56 as of 2026-10-28, while exact lifecycle, voltage, current, and pin-level details should be confirmed against the manufacturer datasheet and current Microchip product page.
This page consolidates verified manufacturer and distributor information, explicitly identifies unavailable engineering data, and avoids presenting unverified substitutes as guaranteed drop-in replacements. This distinction is important because a USB hub controller replacement must match package geometry, pin functions, electrical limits, configuration interface behavior, and power-management timing—not merely the number of USB ports.
直接替換替代品，適用於 USB2503A-HZE — 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： USB2503A-HZE （相同外形與佔位） — 差異在於 Dynamic Power Switching, Product Type, USB Specification.
USB2503-HZE
✅ 直接替換聯絡詢價
查看資料表 →USB2503A-HZE 規格
| Product Type | USB 2.0 3-port hub controller |
| USB Specification | USB 2.0 |
| Downstream Port Count | 3 ports |
| Upstream Port Count | 1 port |
| Transaction Translators | 3 |
| High-Speed Data Rate | 480 Mbit/s |
| Full-Speed Data Rate | 12 Mbit/s |
| Low-Speed Data Rate | 1.5 Mbit/s |
| Firmware Requirement | No firmware development required |
| Configuration Interface | SMBus-compatible SDA/SMBDATA and SCL/SMBCLK/CFG_SELO interface |
| SMBus Pull-Up Resistor | 10 kΩ recommended |
| Power Supply Input | VCC |
| Dynamic Power Switching | Enabled through external SELF_PWR monitoring |
| Self-Powered Detection | External SELF_PWR pin |
| 封裝 | 48-QFN (7x7 mm) |
| 安裝類型 | Surface Mount |
| Maximum USB Data Rate | 480 Mbit/s |
USB2503A-HZE 48-qfn (7x7 mm) 腳位配置指南
USB2503A-HZE（48-qfn (7x7 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： USB2503A-HZE.
請參閱 資料表 以查看完整腳位配置。
典型應用
USB2503A-HZE 適用於 6 應用s: Desktop USB Docking Station, Industrial USB Equipment Hub, USB-to-Device Fan-Out Hub, Embedded Host Peripheral Hub, Test and Measurement Data Hub, External Storage and Accessory Hub.
Desktop USB Docking Station
The USB2503A-HZE fits a docking station that expands one upstream USB connection into three downstream ports for keyboards, storage devices, network adapters, and peripherals. Its USB 2.0 support covers high-speed 480 Mbit/s, full-speed 12 Mbit/s, and low-speed 1.5 Mbit/s devices, while three transaction translators allow simultaneous downstream traffic. Because no firmware development is required, the hub function can be added without a dedicated device-side software stack. The designer must still provide the documented SMBus pull-ups, use 10 kΩ as the starting recommendation, implement USB routing that meets high-speed layout guidance, and account for the power budget of every attached device.
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Industrial USB Equipment Hub
The USB2503A-HZE can organize several USB peripherals in industrial equipment while retaining support for low-speed, full-speed, and 480 Mbit/s high-speed devices. Three downstream ports and three transaction translators are useful when service interfaces, data loggers, removable storage, and control accessories must share one upstream host connection. Dynamic power switching and external SELF_PWR monitoring help the hub disconnect ports during local power-source changes, reducing the chance that downstream equipment remains energized without adequate power. Final industrial deployment still requires verification of the operating-temperature rating, ESD requirements, isolation strategy, connector retention, and enclosure grounding because those values are not present in the verified excerpts.
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USB-to-Device Fan-Out Hub
The USB2503A-HZE is appropriate for a fan-out hub that connects one upstream host to up to three downstream USB devices. The three transaction translators provide a practical benefit when several peripherals exchange data at the same time, rather than forcing a shared single-channel path. The controller supports the full USB 2.0 speed set of 480 Mbit/s, 12 Mbit/s, and 1.5 Mbit/s, allowing legacy and modern devices to coexist on the same hub tier. Designers should size upstream and downstream power distribution, preserve the specified SMBus pull-ups, and validate signal integrity over the intended connector and cable lengths before production release.
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Embedded Host Peripheral Hub
The USB2503A-HZE can extend an embedded host platform with three USB peripheral ports without requiring a custom hub firmware. This makes it suitable for control panels, test equipment, and compact embedded systems that need to connect storage, communications, or human-interface devices to one host port. The controller's three transaction translators help maintain downstream throughput when multiple devices are active, and dynamic power switching provides defined behavior when the SELF_PWR source changes. Board implementation should follow the manufacturer layout guidance, preserve high-speed trace geometry, provide adequate bypass and power distribution, and include the external SMBus pull-ups specified by the datasheet.
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Test and Measurement Data Hub
The USB2503A-HZE can provide a three-port USB aggregation point for test and measurement equipment that combines a control computer with peripherals such as instruments, adapters, and data loggers. High-speed 480 Mbit/s operation supports USB 2.0 test accessories, while full-speed and low-speed support permits legacy devices to remain attached. The absence of a firmware-development requirement can shorten integration, and the three transaction translators may improve behavior when several devices communicate concurrently. Measurement accuracy still depends on clean power, short controlled traces, suitable USB cable qualification, and the use of isolated or protected interfaces where ground offsets could affect equipment.
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External Storage and Accessory Hub
The USB2503A-HZE supports an external hub dedicated to removable storage and general-purpose accessories, with three downstream ports operating under USB 2.0 rules. High-speed 480 Mbit/s operation allows suitable storage devices to retain their USB 2.0 transfer capability, while transaction translators support concurrent traffic from multiple peripherals. The hub does not need custom firmware, reducing development effort for enclosure-based accessories. The implementation should account for hot-plug transients, upstream and downstream current limits, self-powered versus bus-powered operation, the SELF_PWR transition sequence, and the 10 kΩ recommended pull-ups on the SMBus configuration lines.
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工程參考資料，適用於 USB2503A-HZE — 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 | USB2503-HZE |
|---|---|---|
| Package | 48-QFN (7x7 mm) | 48-QFN (7x7 mm) |
| Brand | Microchip Technology | Microchip Technology |
| Product Type | USB 2.0 3-port hub controller | USB hub controller |
主要差異化特點
- Three independent downstream transaction translators (對比USB2503-HZE)
- Complete USB 2.0 speed coverage (對比USB2503-HZE)
- No custom hub firmware required (對比USB2503-HZE)
- Verified family-package match (對比USB2503-HZE)
設計說明
Place the 48-QFN exposed-pad thermal area on a continuous ground or power plane as directed by the manufacturer layout guidance. Keep USB high-speed traces short, matched, and free of unnecessary stubs, and route them away from switching nodes and power inductors. The supplied excerpts establish the 48-QFN package and USB 2.0 functionality but do not provide the complete recommended land pattern, so the manufacturer package drawing must govern copper spacing and exposed-pad geometry.
Design the power tree around both bus-powered and self-powered operation because the controller monitors the external SELF_PWR signal and changes its attach behavior when local power availability changes. Verify downstream-current limits, inrush behavior, hot-plug transients, and the sequencing of downstream and upstream disconnects using the manufacturer datasheet. Do not assume that the three supported USB speeds imply that all three ports can draw maximum high-speed current simultaneously from a single upstream source.
Do not omit the external pull-ups on SDA/SMBDATA and SCL/SMBCLK/CFG_SELO. The verified datasheet excerpt recommends 10 kΩ to VCC and refers to the SMBus 1.0 Specification and EEPROM manufacturer guidelines. Confirm the final values against the selected EEPROM, account for bus capacitance, and avoid long configuration traces. Incorrect pull-up selection can prevent reliable enumeration or configuration even when the USB data paths themselves are correctly routed.
A USB 2.0 hub is a high-speed multi-branch structure, so enclosure exits and external cables can introduce radiated noise and ESD events. Keep connector-to-controller routing compact, provide a continuous return path, use appropriately terminated protection devices, and observe common-mode-choke or filtering needs dictated by system EMC testing. These are implementation practices rather than verified USB2503A-HZE specifications, and qualification should be performed on the complete enclosure, cable, and power configuration.
合規資訊
The verified excerpts do not provide explicit RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals declarations. Compliance must be confirmed on the current Microchip product page or product-change notices.
