KSZ8721BI-TR - 2.5V 10/100 Ethernet PHY Transceiver | Microchip (Tape & Reel)
Артикул: KSZ8721BI-TR ✓ АктивенKSZ8721BI-TR Обзор
An Ethernet PHY is the analog and digital interface between a host controller and an Ethernet network medium. It converts logical MII or RMII data into differential 10Base-T or 100Base-TX signaling, receives and recovers incoming signals, and provides collision, carrier, and link-status information to the host. The KSZ8721 therefore sits between an Ethernet-capable microcontroller, application processor, or network controller and a magnetics-based Ethernet jack or an external fiber-media interface.
The KSZ8721BI-TR operates at 2.5 V to support low-voltage and low-power system requirements. Distributor records identify a 2.375 V to 2.625 V operating supply range, a 48-SSOP package, MII and RMII protocols, and a tube-style shipping format for the KSZ8721BI-TR ordering code. Its 10/100 capability allows a design to support 10 Mbps or 100 Mbps operation while retaining a conventional MII path and an RMII option for host interfaces with fewer pins.
The MII interface exposes separate control, data, and status signals in a parallel form, while RMII reduces the host-side signal count for a more compact implementation. Host-side selection depends on the controller's supported clock and data arrangement, so designers should verify MII-versus-RMII configuration against the system controller and required operating mode. The PHY also requires an appropriate clock reference and the correct external magnetics or fiber-media interface implementation.
Typical uses include industrial controllers, embedded gateways, set-top boxes, print servers, and legacy Ethernet-equipped embedded systems. In a copper link, the device sits on the line side of an isolation transformer network. In a fiber-oriented design, its 100Base-FX capability can be combined with an external optical transceiver, although fiber-module and magnetics selection remain board-level responsibilities.
The principal design consideration is the separation between host-side digital signals and line-side analog signaling. Keep MII or RMII routing short, provide clean clock distribution, use the required decoupling, and follow the manufacturer's reference layout for the media interface. Verify magnetics, termination, and isolation components against the selected 10Base-T or 100Base-TX network topology.
This page consolidates manufacturer information, distributor pricing, and engineering guidance for the KSZ8721BI-TR. It also documents verified parameter gaps instead of substituting unverified values, helping designers compare the device accurately before committing a PCB layout to production.
Аналоги без доработки для KSZ8721BI-TR — тот же корпус, pin-to-pin совместимость. Компоненты в других корпусах, требующие переработки PCB, исключены.
Варианты в этой серии
Модели той же серии, совместимые без доработки с KSZ8721BI-TR (тот же форм-фактор и посадочное место) — отличается по Device Type.
KSZ8721B
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Открыть даташит →KSZ8721BI-TR Характеристики
| Device Type | 10Base-T/100Base-TX/FX physical-layer transceiver |
| Number of Drivers/Receivers | 1/1 |
| Transceiver Configuration | Full |
| Nominal Operating Voltage | 2.5 V |
| Operating Supply Range | 2.375 V to 2.625 V |
| Host Interface Protocols | MII, RMII |
| Ethernet Support | 10Base-T, 100Base-TX, 100Base-FX |
| Data Rate Support | 10 Mbps and 100 Mbps |
| Корпус | 48-SSOP |
| Package Width | 7.50 mm |
| Package Body Length | 0.295 inch |
| Тип монтажа | Surface mount |
| Shipping Format | Tube |
| Количество выводов | 48 pins |
Руководство по цоколевке KSZ8721BI-TR в корпусе 0.295 inch
Цоколевка для KSZ8721BI-TR (корпус 0.295 inch). Нумерация выводов, функции и схемы подключения определены в техническом описании производителя. Обратитесь к нему для точного посадочного места и рекомендаций по пайке.
Нет подробных данных о распиновке для KSZ8721BI-TR.
Обратитесь к даташиту для полной конфигурации выводов.
Типичное применение
KSZ8721BI-TR подходит для 6 применениеs: Industrial Embedded Ethernet Controller, 10/100 Ethernet Network Gateway, Print Server and Office Peripheral Interface, Set-Top and Media Gateway Platform, Fiber-Attached 100Base-FX Equipment, Data Acquisition Equipment with Ethernet Uplink.
Industrial Embedded Ethernet Controller
The KSZ8721BI-TR is appropriate for an industrial embedded controller that needs a dedicated 10/100 Ethernet interface and a 2.5 V supply budget. Its verified 2.375 V to 2.625 V operating range and support for both MII and RMII allow the same PHY family to serve controllers with either a wider parallel bus or a reduced pin-count interface. The PHY is installed between the host processor and an isolation-transformer network, with the selected operating mode configured for 10 Mbps or 100 Mbps. Before release, verify the controller's clock expectations, the temperature range, and the exact Ethernet magnetics recommended by the manufacturer. Its low-voltage operation also reduces compatibility problems with older 2.5 V processor domains, although the media interface still needs careful layout.
Рекомендуется
10/100 Ethernet Network Gateway
A compact network gateway can use the KSZ8721BI-TR to add legacy copper Ethernet connectivity without moving to a multi-gigabit PHY. The device supports 10Base-T and 100Base-TX operation at a nominal 2.5 V, making it useful where the external network segment is limited to Fast Ethernet. MII provides the conventional parallel connection to an embedded processor, while RMII can reduce host-side wiring where the controller supports it. The PHY still requires the appropriate transformer network and termination arrangement. Board planners should reserve space for filtered supply connections, controlled clock distribution, and test points, and should validate link behavior across the intended cable lengths and temperature range.
Рекомендуется
Print Server and Office Peripheral Interface
The KSZ8721BI-TR suits a print-server or office-peripheral controller that needs one Fast Ethernet port and a straightforward processor interface. At 10Base-T and 100Base-TX, it supports equipment networks that commonly operate at 10 or 100 Mbps. RMII can simplify connections to a controller with limited I/O, while MII remains available for designs built around established parallel Ethernet controllers. The board must still implement the external isolation magnetics and line-side network, so the PHY's role ends at the host and media-interface boundaries. Because the verified material does not specify power consumption or operating temperature, both should be reviewed against the enclosure temperature and standby-power target.
Рекомендуется
Set-Top and Media Gateway Platform
The KSZ8721BI-TR can provide a 10/100 network attachment in a set-top box, media gateway, or consumer-network appliance. Its 2.5 V operation is aligned with low-power embedded platforms, while the choice between RMII and MII lets the designer match the host processor rather than redesign the application processor. For a copper connection, place the PHY near the RJ45 and magnetics, then isolate the media-side region from noisy digital circuitry. For a fiber-linked product, the 100Base-FX capability supports an appropriate external media-conversion architecture, but the exact optical and isolation components are not specified in the supplied data and require separate engineering.
Рекомендуется
Fiber-Attached 100Base-FX Equipment
The KSZ8721BI-TR is relevant to equipment that needs a 100Base-FX attachment through an external fiber-media interface. Its 100Base-TX/FX PHY supports 100 Mbps operation, allowing the same host-side MII or RMII connection to be used for copper or fiber variants of a product. The external optical path must be designed with the appropriate driver, receiver, and isolation arrangement, and it must meet the Ethernet link requirements for 100Base-FX. Because the verified data does not specify the precise fiber-mode pin definitions or optical-module interfaces, engineers should use the current Microchip datasheet and reference designs to finalize the fiber implementation.
Рекомендуется
Data Acquisition Equipment with Ethernet Uplink
A data-acquisition or laboratory-instrument controller can use the KSZ8721BI-TR for a 10/100 Ethernet uplink. The 2.5 V supply range and MII/RMII flexibility make the device usable with both legacy acquisition controllers and modern embedded processors. Keeping the PHY and magnetics close to the board edge helps confine high-level media signals to the network section and away from sensitive analog acquisition circuitry. The design should include test access, defined reset or configuration behavior, and a verified clock source. For precision measurement systems, confirm the effect of the PHY's digital switching and supply-current changes on the analog reference and analog-supply domains before production.
Рекомендуется
Сводка рекомендуемых товаров
Справочные инженерные данные для KSZ8721BI-TR — сравнение, рекомендации по проектированию и информация о соответствии.
Руководство по выбору
Сравнение с аналогами
| Параметр | Этот товар | KSZ8721B | KSZ8721BI-TR-TR |
|---|---|---|---|
| Package | 48-SSOP | 48-SSOP | 48-SSOP |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology |
| Device Type | 10Base-T/100Base-TX/FX physical-layer transceiver | 2.5 V 10/100Base-TX/FX MII physical-layer transceiver | Ethernet interface transceiver in the KSZ8721 family |
Ключевые отличия
- Supports both MII and RMII host connections in one 2.5 V PHY (против KSZ8721B)
- Matches the 48-SSOP package and 10/100 Ethernet positioning of the KSZ8721 family (против KSZ8721BI-TR-TR)
- Provides explicit 2.375 V to 2.625 V supply limits (против KSZ8721B)
Заметки по проектированию
Separate the line-side media region from the MII/RMII digital region and place the PHY close to the Ethernet connector and isolation magnetics. Route the differential pairs as controlled-impedance, tightly coupled traces with minimal vias and no stubs. Keep switching regulators, clocks, and high-current digital returns away from the media-side area because those sources can degrade link margin even when the host-side logic operates correctly.
Design the KSZ8721BI-TR supply around its verified 2.375 V to 2.625 V operating range and nominal 2.5 V condition. Place local decoupling at the device's power pins and route it with low impedance, while keeping the supply return path continuous under the package. Confirm the actual PHY current consumption, regulator tolerance, transient response, and startup behavior from the current Microchip datasheet because those values were not supplied in the verified web data.
Provide the PHY with a clean, continuously driven clock source and verify the required frequency, duty cycle, jitter, and relationship to MII or RMII data timing. Avoid using uncontrolled clock sources near sensitive measurement circuitry. If the design operates at 100 Mbps, validate receive sensitivity and transmitter eye performance on the completed layout with the selected magnetics, because board parasitics and component tolerances affect results that cannot be inferred from the basic part description.
Do not assume that every KSZ8721 ordering suffix is automatically interchangeable. The verified data confirms the product family, nominal 2.5 V operation, 48-SSOP format, and MII/RMII capability, but it does not enumerate temperature grades, clock limits, or automotive qualification. Before substituting KSZ8721B or KSZ8721BI-TR-TR, compare the manufacturer ordering information, pin functions, electrical limits, package drawing, and qualification status for the exact suffix.
Информация о соответствии
The supplied verified web data did not state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status. These values remain unknown rather than being inferred from the manufacturer or package.