KSZ8081RNBIA-TR - 10/100 Ethernet PHY | Microchip | 32-QFN
MPN： KSZ8081RNBIA-TR ✓ 啟用中KSZ8081RNBIA-TR 概覽
An Ethernet physical-layer transceiver, or Ethernet PHY, converts digital data supplied by a media-access controller into electrical signaling suitable for twisted-pair cabling, while receiving and decoding signals returning from the network. The PHY belongs to the Ethernet interface hierarchy: network interface controller, Ethernet transceiver, physical layer, interface IC, and semiconductor. Integrating this function beside a microcontroller, processor, or dedicated MAC reduces board space and the amount of external interface circuitry required.
The KSZ8081 supports 10Base-T and 100Base-TX operation, allowing a single Ethernet connection to negotiate with either 10 Mbps or 100 Mbps network equipment. Its full RMII interface connects the PHY to the digital MAC side of the design. Because RMII timing, voltage levels, clocking, and reset sequencing are design-critical, the host controller and PHY must use compatible timing and a correctly implemented reference circuit.
Typical uses include embedded Ethernet control, industrial networking, communications equipment, USB-to-Ethernet products, set-top boxes, printers, and embedded systems requiring a compact 10/100 network port. CAT-5 UTP is the specified cable medium in the verified manufacturer description; newer cable categories may also support the physical installation, but link capability must be verified in the complete system.
A key design consideration is the relationship between digital RMII signals, the single PHY supply, and the network magnetics or integrated magnetics. The PHY footprint, exposed-pad layout, decoupling, clock source, and Ethernet line-side implementation must follow the manufacturer datasheet exactly. Input voltage limits, absolute maximum ratings, timing values, temperature range, and recommended operating conditions are not present in the supplied verification text and are marked as data needed rather than estimated.
This page combines the verified manufacturer product description with distributor availability, packaging, price references, and application guidance. It also separates confirmed facts from engineering questions that still require review of the manufacturer datasheet, including detailed pin names, electrical limits, and qualification status.
直接替換替代品，適用於 KSZ8081RNBIA-TR — 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： KSZ8081RNBIA-TR （相同外形與佔位） — 差異在於 Package, Product Type.
KSZ8081RNBIA
✅ 直接替換📋 參考替代品（不在目錄中）
KSZ8081RNACA-TR
✅ 直接替換聯絡詢價
查看資料表 →KSZ8081RNB
✅ 直接替換📋 參考替代品（不在目錄中）
KSZ8081RNACA-TR
✅ 直接替換聯絡詢價
查看資料表 →KSZ8081MNXIA
✅ 直接替換📋 參考替代品（不在目錄中）
KSZ8081RNBIA-TR 規格
| Product Type | 10Base-T/100Base-TX Ethernet physical-layer transceiver |
| Supported Ethernet Speeds | 10 Mbps and 100 Mbps |
| MAC Interface | Full RMII |
| Supply Architecture | Single-supply |
| Cable Medium | CAT-5 unshielded twisted pair |
| 封裝 | 32-QFN, 5 x 5 mm |
| 安裝類型 | Surface mount |
| Transceiver Count | 1 transceiver |
| DigiKey Product Classification | Ethernet ICs, 10/100 BASE-TX physical-layer transceiver |
KSZ8081RNBIA-TR 32-qfn, 5 x 5 mm 腳位配置指南
KSZ8081RNBIA-TR（32-qfn, 5 x 5 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： KSZ8081RNBIA-TR.
請參閱 資料表 以查看完整腳位配置。
典型應用
KSZ8081RNBIA-TR 適用於 6 應用s: Embedded Ethernet Control, Industrial Networking Equipment, USB-to-Ethernet Adapter, Communications Equipment, Set-Top and Media Devices, Printer and Network Peripheral.
Embedded Ethernet Control
The KSZ8081RNBIA-TR fits an embedded controller that already provides an RMII-compatible MAC and needs a separate copper-network interface. Its verified 10Base-T and 100Base-TX support covers the two common Fast Ethernet rates, while full RMII provides the digital handoff to the host controller. Place the PHY near the board edge, route its line-side signals toward the network interface, and keep the 50 MHz-class interface timing concerns under control according to the manufacturer guidance. The verified record does not provide the exact reference-clock mode or supply limits, so those values must be confirmed in the datasheet before schematic release.
推薦
Industrial Networking Equipment
KSZ8081RNBIA-TR can provide the Fast Ethernet physical layer in industrial controllers, gateways, and monitoring equipment that connects through CAT-5 UTP. The single-supply architecture and compact 32-QFN 5 x 5 mm footprint help conserve board area compared with discrete transceiver implementations. A production design must still address operating-temperature limits, isolation strategy, grounding, surge protection, magnetics, and enclosure requirements. Those qualifications are not stated in the supplied snippets, so the manufacturer datasheet and product documentation should determine whether the exact ordering code suits the target industrial environment.
推薦
USB-to-Ethernet Adapter
The KSZ8081RNBIA-TR is suitable for the network-facing section of a compact USB-to-Ethernet adapter when the host controller can drive a full RMII PHY. Its verified 10/100 capability supports compatibility with both 10 Mbps and 100 Mbps links, while the 32-QFN package limits PCB area. Designers should follow the manufacturer’s RMII timing, decoupling, reset, and clock layouts rather than routing the digital interface as ordinary slow-speed logic. Magnetics selection, isolation requirements, USB connector design, and current cable-length performance also need separate verification for the finished adapter.
推薦
Communications Equipment
KSZ8081RNBIA-TR can add a 10/100 copper-network port to communications equipment such as gateways, terminals, and protocol converters. The full RMII interface provides a defined path between the PHY and the digital network controller, while the verified 32-QFN 5 x 5 mm package supports compact designs. Clock sourcing must be selected according to the supported RMII mode, and the MAC must use compatible voltage levels. For equipment intended for long product lifetimes, procurement should also consider lifecycle status, alternate sourcing, and documented traceability rather than relying only on current distributor stock.
推薦
Set-Top and Media Devices
The KSZ8081RNBIA-TR can support network connectivity in compact set-top boxes and media devices requiring 10/100 Ethernet rather than gigabit performance. The PHY uses CAT-5 UTP and connects through full RMII, making it suitable where board space is constrained. The system must respect the device’s verified package and interface requirements, including correct treatment of the 32-QFN exposed pad and the placement of high-speed RMII and line-side connections. Exact temperature, power, and clock specifications are unavailable in the supplied data and should be obtained from the authoritative datasheet before production use.
推薦
Printer and Network Peripheral
KSZ8081RNBIA-TR is applicable to a printer or other Fast Ethernet peripheral when the main controller includes or can communicate with an RMII-compatible MAC. The PHY’s 10/100 support permits interoperability with older 10 Mbps infrastructure as well as 100 Mbps networks. The design team should verify reference-clock support, reset requirements, line-side magnetics, and all 32 package pins against the manufacturer documentation. Because the provided search data does not establish lead-free, RoHS, REACH, or automotive status, regulated production requirements should be checked separately using current Microchip documentation.
推薦
工程參考資料，適用於 KSZ8081RNBIA-TR — 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 | KSZ8081RNBIA | KSZ8081RNA | KSZ8081RNB | KSZ8081RNACA | KSZ8081MNXIA |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 32-QFN 5 x 5 mm | 32-QFN 5 x 5 mm | 32-QFN 5 x 5 mm | 32-QFN 5 x 5 mm | 32-QFN 5 x 5 mm | 32-QFN 5 x 5 mm |
| Ordering Suffix | RNBIA-TR | RNBIA without -TR | RNA | RNB | RNACA | MNXIA |
主要差異化特點
- The target ordering code is explicitly identified as a full-RMII 10/100 Ethernet PHY in a compact 32-QFN package. (對比KSZ8041RNL)
- The -TR ordering code is associated with the tape-and-reel production presentation listed by the distributor search. (對比KSZ8081RNBIA)
- The manufacturer page directly confirms the KSZ8081 family supports CAT-5 UTP and both 10Base-T and 100Base-TX. (對比KSZ8061RNBW)
設計說明
Follow the Microchip KSZ8081 reference layout for the 32-QFN footprint, exposed pad, RMII traces, supply connections, and line-side routing. Keep the PHY and decoupling network close to their relevant pins, provide a low-impedance ground return, and avoid unnecessary stubs. Because the supplied data confirms a 32-QFN 5 x 5 mm package but not exact pin functions, do not release PCB artwork until all pins and exposed-pad requirements have been checked against the manufacturer package drawing.
Treat RMII as a timed digital interface rather than a generic control bus. Confirm whether the design requires a transmitted or received clock, establish the supported clock frequency, and use source-synchronous return-path considerations for the data group. Match trace lengths as recommended by the manufacturer and keep clock routing away from Ethernet magnetics and other high-energy switching nodes. The verified text confirms full RMII but does not specify the exact clock mode.
Design the single-supply rail only after checking the datasheet’s operating range, absolute maximum ratings, startup requirements, and decoupling values. Place bulk and high-frequency bypass capacitors at the locations prescribed by the manufacturer, with low-inductance connections to the supply and ground pins. If the board combines the PHY with switching regulators or processors, verify startup margin and ripple tolerance on the Ethernet rail before relying on the nominal single-supply description.
合規資訊
The supplied verified snippets do not explicitly state compliance for the exact ordering code. Check current Microchip product, material-declaration, quality, and regulatory documents rather than assuming status from the product family or distributor listing.
