LAN8741AI-EN - 10/100 Ethernet PHY | Microchip Technology
MPN： LAN8741AI-EN ✓ 啟用中LAN8741AI-EN 概覽
An Ethernet physical-layer transceiver, commonly called an Ethernet PHY, converts between digital MAC signals and analog signals carried over twisted-pair cabling. Within the network hierarchy, LAN8741AI-EN belongs to the Ethernet interface IC category and implements the physical layer required by a 10/100 Fast Ethernet MAC. It adds negotiated speed and duplex selection, HP Auto-MDIX cable handling, Energy Efficient Ethernet support, and power-saving sleep functions to the basic physical-layer function.
The LAN8741AI-EN supports IEEE 802.3az Energy Efficient Ethernet, full-duplex 10BASE-T and 100BASE-TX links, automatic speed and duplex negotiation, and HP Auto-MDIX. HP Auto-MDIX allows a direct-connect or crossover cable to be used without manually reconfiguring the PHY. The manufacturer also identifies deterministic loopback delay as a feature for real-time system performance, making the device relevant to deterministic embedded networking designs.
Communication with the Ethernet MAC is performed through standard MII or RMII interfaces. IEEE 802.3u-compatible MII operation provides a parallel digital interface, while RMII reduces the number of required signals. The interface choice allows the PHY to be paired with an embedded controller, microcontroller, application processor, or other MAC-capable host according to the system clocking and signal-count requirements.
Typical uses include industrial control equipment, embedded Ethernet gateways, factory automation nodes, building automation controllers, network-connected sensors, and compact communication modules. The industrial temperature range supports designs expected to operate across extended commercial environments, although system designers must also verify thermal, isolation, magnetics, and regulatory requirements for their installation environment.
PCB implementation should account for the 5 mm by 5 mm SQFN footprint, exposed-pad thermal management, short high-speed traces, controlled return paths, and the external magnetics required by the Ethernet physical layer. Keep the digital MAC interface separated as far as practical from the analog network-side circuitry, and use the manufacturer’s reference layout and component guidance to preserve signal integrity and reliable auto-negotiation.
This product page organizes the LAN8741AI-EN’s interface capabilities, package information, operating ranges, available drop-in alternative, application guidance, and design considerations. It also identifies the engineering details that require confirmation against the manufacturer datasheet, particularly pin assignments and detailed electrical limits.
直接替換替代品，適用於 LAN8741AI-EN — 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： LAN8741AI-EN （相同外形與佔位） — 差異在於 Auto-MDIX, Auto-Negotiation, Package, Commercial Temperature Range, Energy Efficient Ethernet.
LAN8741A-EN
✅ 直接替換聯絡詢價
查看資料表 →LAN8741AI-EN 規格
| Product Type | 10/100 Fast Ethernet physical-layer transceiver |
| Supported Data Rates | 10 Mbps and 100 Mbps |
| MAC Interface | Full MII and RMII |
| Ethernet Modes | Full-duplex 10BASE-T and 100BASE-TX |
| 封裝 | 32-SQFN, 5 mm x 5 mm |
| 腳位數 | 32 pins |
| 安裝類型 | Surface mount |
| Industrial Temperature Range | -40°C to 85°C |
| Commercial Temperature Range | 0°C to 70°C |
| Auto-Negotiation | Automatic speed and duplex selection |
| Auto-MDIX | HP Auto-MDIX support |
| Energy Efficient Ethernet | IEEE 802.3az |
| MII Standard Compatibility | IEEE 802.3u |
| Vendor-Specific Registers | Supported |
| Loopback Delay | Deterministic |
| Power-Saving Features | System sleep modes and flexPWR Technology |
| Transceiver Count | 1 transceiver |
| RoHS 狀態 | unknown |
LAN8741AI-EN 32-sqfn, 5 mm x 5 mm 腳位配置指南
LAN8741AI-EN（32-sqfn, 5 mm 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： LAN8741AI-EN.
請參閱 資料表 以查看完整腳位配置。
典型應用
LAN8741AI-EN 適用於 6 應用s: Industrial Ethernet Gateway, Factory Automation Controller, Building Automation Controller, Networked Sensor Node, Embedded Communication Module, Real-Time Control System.
Industrial Ethernet Gateway
The LAN8741AI-EN fits industrial gateways that connect an embedded controller or application processor to a 10/100 Ethernet network. Its Full MII or RMII interface supports integration with processors that have a compatible MAC, while auto-negotiation selects 10 Mbps or 100 Mbps and the appropriate duplex mode. The documented -40°C to 85°C industrial range supports equipment operating beyond the 0°C to 70°C commercial range. HP Auto-MDIX simplifies field cabling, and IEEE 802.3az support helps reduce link power when the network and host configuration permit it.
推薦
Factory Automation Controller
The LAN8741AI-EN is appropriate for factory automation controllers requiring a compact 10/100 Ethernet physical layer. Its 5 mm by 5 mm 32-SQFN package preserves board area compared with larger Ethernet transceivers, while RMII can reduce the number of host-interface signals when the selected controller supports it. Auto-negotiation improves interoperability with varying switch capabilities, and HP Auto-MDIX removes assumptions about straight-through or crossover cable wiring. The -40°C to 85°C range suits equipment designed for industrial ambient conditions.
推薦
Building Automation Controller
A LAN8741AI-EN can provide the physical layer for building automation controllers that communicate over 10BASE-T or 100BASE-TX networks. The RMII option is useful when the host controller benefits from a compact digital interface, while Full MII provides an alternative for hosts designed around IEEE 802.3u signaling. Energy Efficient Ethernet and system sleep modes can reduce consumption when traffic is intermittent. The industrial temperature option supports controllers deployed in equipment rooms, control panels, and remote monitoring installations.
推薦
Networked Sensor Node
The LAN8741AI-EN can add wired Ethernet connectivity to a compact sensor or condition-monitoring node without requiring a multi-gigabit PHY. At 10 Mbps or 100 Mbps, it supports common plant, building, and industrial monitoring networks. HP Auto-MDIX simplifies installation with unknown cable orientation, and deterministic loopback delay is useful where predictable network behavior matters. The small 32-SQFN footprint helps minimize board area, although designers must provide the Ethernet magnetics and carefully control the exposed-pad thermal design.
推薦
Embedded Communication Module
The LAN8741AI-EN is suitable for embedded communication modules that add 10/100 Fast Ethernet to a microcontroller, system-on-chip, or communications processor. RMII can minimize interface pin count on space-constrained modules, whereas Full MII supports conventional parallel Ethernet designs. Automatic speed and duplex negotiation improves link setup, while Energy Efficient Ethernet support can lower power demand during light traffic. The 5 mm by 5 mm package supports compact assemblies but requires a compliant land pattern, exposed-pad soldering, and external magnetic coupling to the network.
推薦
Real-Time Control System
The LAN8741AI-EN can serve as the Ethernet PHY in a deterministic embedded control system using 10/100 Fast Ethernet. Microchip Technology identifies deterministic loopback delay as a LAN8741A/LAN8741Ai feature, which helps support predictable real-time performance in suitable network architectures. Auto-negotiation and HP Auto-MDIX reduce installation variability, while MII or RMII provides integration flexibility with the host controller. System-level determinism still depends on the complete network, switch behavior, MAC implementation, and task scheduling.
推薦
推薦產品摘要
工程參考資料，適用於 LAN8741AI-EN — 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 | LAN8741A-EN |
|---|---|---|
| Manufacturer | Microchip Technology | Microchip Technology |
| Package | 32-SQFN (5x5) | 32-SQFN (5x5) |
| Supported Ethernet Speeds | 10 Mbps and 100 Mbps | 10 Mbps and 100 Mbps |
| MAC Interface | Full MII and RMII | Full MII and RMII |
| Auto-Negotiation | Supported | Supported |
| Energy Efficient Ethernet | IEEE 802.3az supported | IEEE 802.3az supported |
| Loopback Delay | Deterministic | Deterministic |
| Pin Count | 32 pins | 32 pins |
主要差異化特點
- Compact 10/100 Ethernet interface with two host-side choices (對比LAN8741A-EN)
- Industrial temperature capability (對比LAN8741A-EN)
- Power-aware Ethernet operation (對比LAN8741A-EN)
- Installation and real-time behavior (對比LAN8741A-EN)
設計說明
Use the manufacturer reference layout for the 32-SQFN footprint and preserve the exposed-pad thermal and electrical requirements. Keep MII or RMII routing short and continuous, provide a continuous reference plane beneath the digital interface, and avoid placing high-current or switching-node traces parallel to sensitive clock and data paths. Confirm the final pin assignments, exposed-pad connection, and component placement against the manufacturer datasheet before releasing PCB artwork.
Follow the manufacturer guidance for Ethernet magnetics, termination, decoupling, and the PHY-to-network-side component arrangement. Network-side analog traces should be short and isolated from digital clocks and switching supplies. The RMII interface can reduce signal count, but its timing depends on the selected MAC clocking arrangement. Validate TXD, RXD, CRS_DV, and reference-clock routing with the exact host controller and magnetics used in production.
Treat the SQFN exposed pad as a thermal and electrical feature rather than an optional copper area. Apply the manufacturer’s soldering and land-pattern instructions, control voiding beneath the device, and provide adequate board area for expected dissipation. Estimated thermal calculations require confirmed input voltage, PHY current, ambient temperature, board construction, and exposed-pad geometry; obtain those values before assigning a heatsink or copper-area requirement.
Do not treat the 32-SQFN package as a generic pin-compatible socket without checking the exact LAN8741 ordering code and connector assignments. Confirm whether the host requires MII or RMII, whether the magnetics support HP Auto-MDIX, and whether the application expects the -40°C to 85°C industrial grade. Also verify power sequencing, clock tolerances, reset behavior, and cable-support claims against the complete host and network design.
合規資訊
No specific environmental or material-compliance declarations for this ordering code were identified. IEEE 802.3u and IEEE 802.3az are Ethernet interface standards, not product compliance certifications.
