4/4 Transceiver Full MII, RMII 32-VQFN (5x5) ## Engineering Specification ## General Description The **LAN8770M-I/PRA** is a Microchip Technology single-port **100BASE-T1 Ethernet physical layer transceiver** designed for automotive, industrial, and embedded networking applications. It provides Ethernet communication over a single balanced twisted pair and is suitable for compact systems requiring reliable network connectivity, low-power operation, and standard MAC interface support. The device is commonly used in automotive electronic control units, infotainment systems, telematics modules, sensor nodes, industrial control systems, and embedded Ethernet hardware. ## Device Identification Manufacturer Part Number: **LAN8770M-I/PRA** Manufacturer: **Microchip Technology** Product Family: **LAN8770** Device Category: **Integrated Circuit** Device Type: **Ethernet PHY Transceiver** Ethernet Standard: **100BASE-T1** Interface Type: **MII and RMII** Mounting Type: **Surface Mount** Package Type: **VQFN** ## Functional Description The device functions as an Ethernet physical layer transceiver that connects a host controller or microcontroller MAC interface to a single-pair Ethernet physical medium. It handles the analog and digital PHY functions required for 100BASE-T1 communication, allowing embedded systems to transmit and receive Ethernet data over a single twisted pair cable. ## Network and Interface Description The **LAN8770M-I/PRA** supports 100 Mb/s single-pair Ethernet communication and provides MII and RMII host interface options. This allows integration with microcontrollers, processors, gateways, and network controllers that support standard Ethernet MAC interfaces. The device is intended for applications where compact Ethernet connectivity and reduced cabling complexity are required. ## Electrical Description The device is designed for low-voltage operation and supports multiple supply domains according to the manufacturer’s recommended operating conditions. Proper power sequencing, decoupling, reset handling, clocking, and reference layout should be implemented to maintain stable PHY operation and signal integrity. ## Package and Mechanical Description The component is supplied in a compact surface-mount **VQFN package**, suitable for dense printed circuit board assemblies. The package supports automated assembly and is appropriate for space-constrained automotive and industrial electronic designs. ## Control and Diagnostic Description The PHY supports management and configuration through standard control interfaces used in Ethernet designs. It provides status monitoring and configuration capability for link management, operating mode selection, and system-level diagnostics. These features allow the host controller to configure and monitor Ethernet link behavior during operation. ## Automotive and Industrial Suitability The **LAN8770M-I/PRA** is suitable for embedded systems requiring robust single-pair Ethernet communication. It is applicable to automotive networking, telematics, infotainment, advanced driver assistance systems, industrial Ethernet nodes, building automation, control modules, and other connected embedded platforms. ## Mounting and Assembly Description The component is intended for surface-mount PCB assembly using standard reflow soldering processes. PCB layout should follow Microchip’s hardware design guidance, including proper power supply decoupling, controlled impedance routing, short signal paths, grounding, and separation of sensitive analog and digital sections where applicable. ## Design Considerations The design should account for Ethernet signal integrity, single-pair cable interface requirements, common-mode noise control, EMC performance, supply filtering, oscillator or clock source requirements, reset timing, thermal performance, and package solderability. The device should not be operated beyond the manufacturer’s specified electrical, thermal, or mechanical limits. ## Application Suitability The device is suitable for automotive Ethernet nodes, electronic control units, telematics modules, infotainment systems, sensor interfaces, industrial controllers, embedded gateways, connected equipment, and compact network-enabled hardware requiring 100BASE-T1 Ethernet PHY functionality. ## Hashtags #commonpartslibrary #integratedcircuit #ethernetphy #microchip #microchiptechnology #lan8770 #lan8770mipra #singlepairethernet #100baset1 #automotiveethernet #ethernettransceiver #phytransceiver #embeddednetworking #mii #rmii #vqfnpackage #smdcomponent #surfacemount #automotiveelectronics #industrialethernet #telematics #infotainment #embeddedhardware #pcbdesign #hardwaredesign #electronicscomponents #electronicparts #componentlibrary #engineeringparts #electronicsengineering

Ethernet Controller 10/100 Base-T/TX Bus Interface 80-TQFP-EP (12x12) The LAN9254-I/JRX is an EtherCAT SubDevice (slave) controller developed by Microchip Technology, designed to serve as the communication backbone for industrial automation devices participating in an EtherCAT network. The device integrates dual Ethernet physical layer transceivers directly on-chip, eliminating the need for external PHY components and simplifying the design of EtherCAT-enabled equipment such as servo drives, sensors, I/O modules, and other field devices used in real-time industrial control systems. Architecturally, the controller can operate as either a two-port or three-port node, depending on the network topology required. In its standard configuration it functions as a two-port device supporting daisy-chain connections typical of EtherCAT line topologies. When configured as a three-port device, it gains an additional management interface port that can connect to an external PHY or to another LAN9254, enabling star or tree network topologies and allowing the device to act as a branching point within a larger EtherCAT installation. Each integrated Ethernet PHY operates in full-duplex mode and supports automatic crossover detection, so the device can use either straight-through or crossover cabling without requiring manual configuration. Beyond pure protocol handling, the LAN9254 includes a substantial set of general-purpose digital input and output lines, allowing it to be used in simple field devices without requiring a separate microcontroller. For more complex applications, the device communicates with an external host processor through an integrated host bus interface that behaves like simple memory-mapped SRAM, supporting both 8-bit and 16-bit data widths along with multiple byte-ordering conventions, which makes it straightforward to interface with a wide range of microcontroller and microprocessor architectures. Internally, dual process data RAM buffers manage the exchange of real-time process data between the host application and the EtherCAT communication engine, while a dedicated interrupt line notifies the host of relevant internal events. A key feature of the device is its built-in distributed clock mechanism, which provides high-precision timing synchronization across all nodes in an EtherCAT network. This capability is essential for motion control and other applications where multiple devices must act in tight temporal coordination. The controller also provides configurable status indication through standard network activity and link LEDs, along with optional error and run-state indicators that give visibility into the health and operational state of the device at a glance. Power architecture on the LAN9254 is simplified through an integrated linear regulator, allowing the device to be operated from a single primary supply rail while internally generating the lower voltage needed for its core logic. This reduces the external power supply complexity that would otherwise be required to support separate core and I/O voltage domains. The "-I" designation on this particular part number indicates an industrial-grade temperature rating, making it suitable for deployment in factory floor and other demanding industrial environments where extended thermal range and long-term reliability are required. The device is housed in a surface-mount package consistent with dense industrial control board layouts and is compliant with RoHS material restrictions. Spec Sheet Identification Part Number: LAN9254-I/JRX Device Family: LAN9254 Manufacturer: Microchip Technology Functional Classification Device Type: EtherCAT SubDevice (slave) controller Network Role: Two/three-port configurable node Integrated PHYs: Dual Ethernet physical layer transceivers, on-chip Auto-MDIX Support: Yes, supports direct and crossover cabling Communication & Protocol Features Protocol: EtherCAT Topology Support: Daisy-chain (line), star, and tree topologies Additional Port Mode: Optional third port for branching/tap configurations Clock Synchronization: Integrated distributed clock for high-precision timing Host Interface Interface Type: SRAM-like host bus interface Data Width Support: Selectable bit-width host bus operation Endianness Support: Multiple byte-ordering modes Process Data Handling: Dual process data RAM buffers Interrupt Support: Configurable host interrupt line Digital I/O General-Purpose I/O: Integrated digital I/O lines for microcontroller-less operation Standalone Mode: Supports operation without external microcontroller for simple device designs Power Architecture Supply Configuration: Single primary supply rail Internal Regulation: Integrated linear regulator for core voltage generation Status Indication LED Support: Standard run and link/activity indicators per port Optional Indicators: Configurable error and run-state status indicators Environmental & Qualification Temperature Grade: Industrial ("-I" suffix) RoHS Compliance: Yes Package Package Type: Surface-mount, quad flat package style Mounting: Surface mount technology (SMT) Packaging Format Supply Format: Tape-and-reel, per part suffix designation #LAN9254 #Microchip #EtherCAT #SlaveController #SubDeviceController #IndustrialEthernet #IndustrialAutomation #MotionControl #EmbeddedSystems #FieldDevice #DigitalIO #HostBusInterface #DistributedClock #TQFP #RoHSCompliant #IndustrialGrade #EngineeringSpec #ComponentLibrary #CommonPartsLibrary #SemiconductorIC

Shielded RJ45 Connector with Integrated Magnetics (PoE) – Single-port RJ45 Ethernet connector with integrated 10/100Base-T magnetics for industrial Ethernet, embedded networking, IoT gateways, automation equipment, IP cameras, networking devices, and Power over Ethernet (PoE) applications. Features a through-hole, right-angle PCB mount, CAT5e-compliant interface, and supports 10/100Base-T Ethernet, Auto-MDIX, and PoE operation. Includes integrated isolation transformers, common-mode chokes, yellow and green status LEDs, shielded metal housing, board guide for secure mounting, and gold-plated contacts (30 µin / 0.76 µm) for reliable long-term performance. Designed with a tab-down RJ45 orientation, 90° entry, and operates over a −40°C to +85°C temperature range, making it suitable for rugged industrial and embedded networking applications. #WurthElektronik #7499210121A #RJ45Connector #EthernetConnector #IntegratedMagnetics #MagJack #CAT5e #PoE #10100BaseT #IndustrialEthernet #EmbeddedNetworking #IoT #EmbeddedSystems

Isolated IEEE 802.3af PoE Powered Device (PD) DC-DC Converter Module – High-efficiency isolated Power over Ethernet (PoE) DC-DC converter module designed for IP cameras, VoIP phones, wireless access points, industrial Ethernet devices, IoT gateways, embedded networking equipment, and PoE-powered systems. Delivers a regulated 5 V output at up to 5.1 A (25.5 W) from a 37 V to 57 V PoE input, compliant with IEEE 802.3af PoE Powered Device (PD) requirements. Features 2.25 kVDC input-to-output isolation, up to 90.5% efficiency, low ripple and noise (150 mVp-p max), integrated PoE interface, overcurrent, overvoltage, and short-circuit protection, and support for T2P and adapter OR-ing. Designed for surface-mount assembly in a compact 35.5 × 22.4 × 10.6 mm module, it operates over a −40°C to +85°C temperature range, making it ideal for commercial and industrial embedded power applications. #MurataPowerSolutions #MYBSP0055AABFT #PoEConverter #DCDCConverter #PowerOverEthernet #IEEE8023af #IsolatedPowerModule #IndustrialEthernet #EmbeddedPower #IoT #SurfaceMount #EmbeddedSystems

7-Port Gigabit Managed Ethernet Switch IC – High-performance Layer 2 managed Ethernet switch designed for industrial automation, IoT gateways, embedded networking, automotive networking, IP cameras, networked audio/video systems, and communication equipment. Integrates 7 Gigabit Ethernet ports with 5 integrated 10/100/1000BASE-T PHYs, 1 SGMII interface, and 1 configurable RGMII/MII/RMII interface, enabling flexible network architectures. Supports IEEE 802.3 Ethernet standards, QoS, VLAN (802.1Q), Rapid Spanning Tree Protocol (RSTP), IGMP snooping, LinkMD® cable diagnostics, Energy Efficient Ethernet (EEE), Wake-on-LAN (WoL), port mirroring, rate limiting, and advanced packet filtering for robust managed networking. Features I²C and SPI management interfaces, operates from 1.8 V, 2.5 V, and 3.3 V supplies, and is specified for the −40°C to +85°C industrial temperature range. Packaged in a 128-pin TQFP-EP (14 × 14 mm) for high-density embedded networking designs. #Microchip #KSZ9897STXITR #KSZ9897 #GigabitEthernetSwitch #ManagedSwitch #Layer2Switch #IndustrialEthernet #SGMII #RGMII #IoTGateway #NetworkController #EmbeddedSystems

IEEE 802.3bt Type 4 Power over Ethernet (PoE) Powered Device Module – High-power isolated PoE Powered Device (PD) module for IP cameras, wireless access points, LED lighting, digital signage, industrial automation, access control, IoT gateways, and embedded networking applications. Fully compliant with IEEE 802.3bt Type 4, it accepts a 36 V to 57 V PoE input and delivers up to 85 W output power with selectable 12 V or 24 V regulated outputs and an adjustable output voltage. Features a high-efficiency isolated DC-DC converter (up to 89%), 1.5 kV input-to-output isolation, integrated PD detection and classification, low output ripple and noise, and comprehensive overload, thermal, and short-circuit protection. Designed to minimize external components for simplified PoE implementation, it is housed in a compact through-hole DIL module (70 × 35 × 17 mm) and operates over a −40°C to +85°C temperature range. #Silvertel #AG5800 #PoEPoweredDevice #IEEE8023bt #PowerOverEthernet #PDModule #IsolatedDCDC #IndustrialEthernet #IPCamera #LEDLighting #EmbeddedPower #EmbeddedSystems

Microchip KSZ8863RLL, 3-Port Ethernet Switch, MII/RMII, 10 Mbps, 100 Mbps 1.8 V, 3.3 V, 48-Pin LQFP Microchip KSZ8863/KSZ8873 Family – integrated 3-port 10/100 Mbps managed Ethernet switch with built-in PHYs, designed for embedded networking, industrial communication, IoT gateways, automation systems, VoIP devices, and broadband equipment. Features VLAN support, QoS prioritization, IGMP snooping, Rapid Spanning Tree Protocol (RSTP), port mirroring, cable diagnostics, MII/RMII interfaces, SPI/I²C management, MAC filtering, and low-power operation. Provides store-and-forward switching architecture with advanced traffic management and network monitoring capabilities. Search Keywords: KSZ8863, KSZ8873, Microchip Ethernet Switch, 3 Port Ethernet Switch, Managed Ethernet Switch, 10/100 Ethernet Switch IC, Embedded Ethernet Switch, Industrial Ethernet Controller, Integrated PHY Ethernet Switch, RMII Ethernet Switch, MII Ethernet Interface, VLAN Ethernet Switch, QoS Ethernet Switch, IGMP Snooping Switch, Network Processor Interface, Industrial Networking IC, IoT Gateway Ethernet, VoIP Ethernet Controller, Managed LAN Switch, Fast Ethernet Switch Hashtags: #KSZ8863 #KSZ8873 #Microchip #EthernetSwitch #ManagedSwitch #FastEthernet #IndustrialEthernet #EmbeddedNetworking #IntegratedPHY #RMII #MII #VLAN #QoS #IGMPSnooping #IndustrialAutomation #IoTGateway #NetworkController #ElectronicsDesign #PCBDesign #EmbeddedSystems

DGUK411Q199DB2A1DP (POE+) is a single-port RJ45 Ethernet connector with integrated magnetics (MagJack) designed for 10/100/1000BASE-T Gigabit Ethernet applications. It supports Power over Ethernet Plus (PoE+) in compliance with IEEE 802.3at, allowing both data and power transmission through a single Ethernet cable. The connector features integrated isolation transformers, EMI suppression, LED indicators for link/activity status, and a shielded through-hole right-angle design, making it suitable for networking equipment, industrial Ethernet devices, IP cameras, wireless access points, and PoE-powered embedded systems. Key Features Single-port RJ45 connector with integrated magnetics (MagJack) Supports 10/100/1000BASE-T Gigabit Ethernet PoE+ (IEEE 802.3at) compatible for Power Sourcing Equipment (PSE) and Powered Device (PD) applications Integrated isolation transformers and common-mode noise filtering Shielded construction for improved EMI performance Right-angle, through-hole PCB mounting Built-in dual LED indicators for link and activity status High isolation voltage (2250 VDC) RoHS compliant Ideal for routers, switches, industrial controllers, IP cameras, IoT gateways, and other Gigabit Ethernet devices with PoE support #RJ45 #MagJack #EthernetConnector #GigabitEthernet #1000BASE_T #PoEPlus #IEEE8023at #IntegratedMagnetics #Networking #IndustrialEthernet #EmbeddedSystems #ThroughHole #ShieldedConnector #PCBDesign

Power over Ethernet (PoE) Flyback Transformer – Surface-mount flyback transformer optimized for Power over Ethernet (PoE) powered devices, isolated DC-DC converters, industrial Ethernet equipment, IP cameras, wireless access points, IoT gateways, and embedded networking applications. Part of the Würth Elektronik WE-PoE+ Series, it is specifically designed for use with the Analog Devices LT4276 PoE PD controller and supports IEEE 802.3at (PoE+) power conversion. Features 38 µH primary inductance (100 kHz), 37 V to 57 V primary input, 12.5 V auxiliary winding at 30 mA, 1,500 Vrms isolation voltage, and operation over a 250 kHz to 400 kHz switching frequency. Built in a compact surface-mount package (13.46 × 15.00 × 12.70 mm), it is specified for −40°C to +125°C operation, making it ideal for high-efficiency isolated PoE power supplies in demanding industrial and embedded environments. #WurthElektronik #750310742 #WEPoEPlus #PoETransformer #FlybackTransformer #PowerOverEthernet #IEEE8023at #LT4276 #DCDCConverter #IndustrialEthernet #EmbeddedPower #EmbeddedSystems