KSZ8873MLLJ - 3-Port 10/100 Managed Ethernet Switch | Microchip
MPN: KSZ8873MLLJ ✓ نشطKSZ8873MLLJ نظرة عامة
An Ethernet switch is a network-interface semiconductor that forwards Ethernet frames between a host processor and multiple physical-network ports. The KSZ8873MLLJ combines a managed switching function and three integrated PHYs in one device, reducing the component count required for an embedded Ethernet gateway, controller, or industrial network node. Its managed architecture supports register-based configuration and monitoring rather than operating only as a simple fixed-function bridge.
Key features include three 10/100 ports, integrated 10BASE-T and 100BASE-TX PHYs, 16 active VLANs, and a 16-entry VLAN table. The VLAN table converts a 12-bit VLAN identifier into a 4-bit filter identifier for address lookup. Configuration access through I2C, SPI, and the non-standard SMI management interface allows the surrounding controller to monitor and control switch registers and operating states.
The device combines integrated media converters, a frame switch, management logic, and host-facing interfaces in a single 64-LQFP package. Supporting 1.8 V, 2.5 V, and 3.3 V operation makes it adaptable to systems with mixed low-voltage digital rails, while the 10 mm by 10 mm package keeps the component reasonably compact for embedded control boards. Its -40 °C to 125 °C industrial temperature range supports demanding industrial environments.
Typical uses include industrial Ethernet controllers, embedded gateways, automated equipment, set-top boxes, printers, network appliances, and compact control systems requiring several Fast Ethernet ports. A typical implementation places the switch between a host processor's RMII interface and three copper Ethernet ports, allowing the host to configure VLAN behavior, address tables, port functions, and link status through its serial management interface.
Designers should preserve the power and decoupling topology specified by the manufacturer and route each Ethernet pair according to the datasheet's magnetics and layout guidance. Keep management signals away from high-speed copper traces, provide adequate return paths, and use the exact 64-pin assignment from the manufacturer datasheet when assigning PCB nets.
This page consolidates the verified switch capabilities, package details, management features, application guidance, comparison criteria, and sourcing information for engineers evaluating the KSZ8873MLLJ for compact three-port 10/100 managed Ethernet designs.
بدائل مباشرة لـ KSZ8873MLLJ — نفس الحزمة، متوافق دبوس بدبوس. تُستثنى القطع ذات الحزم المختلفة التي تتطلب تعديل PCB.
لا تتوفر بدائل متوافقة تمامًا لهذا المنتج.
اطلب بدائلKSZ8873MLLJ الحدود القصوى والخصائص الكهربائية
| Product Type | Managed Ethernet switch with integrated PHYs |
| Number of Ports | 3 ports |
| Ethernet Speed | 10/100 Mb/s |
| Supported Physical Layers | 10BASE-T and 100BASE-TX |
| Integrated PHY Count | 3 integrated PHYs |
| Host Interface | 1 x RMII |
| Configuration Interfaces | I2C, SPI, and SMI |
| Supply Voltage Options | 1.8 V, 2.5 V, and 3.3 V |
| Active VLANs | 16 VLANs |
| IEEE VLAN Identifier Space | 4096 possible VLAN IDs |
| VLAN Table Capacity | 16 entries |
| VLAN Identifier Width | 12 bits |
| Filter Identifier Width | 4 bits |
| العلبة | 64-LQFP, 10 mm x 10 mm |
| درجة حرارة التشغيل | -40 °C to 125 °C |
دليل تكوين أطراف KSZ8873MLLJ 64-lqfp, 10 mm x 10 mm
تكوين الأطراف لـ KSZ8873MLLJ (حزمة 64-lqfp, 10 mm x 10 mm). يتم تعريف ترقيم الأطراف والوظائف ومخططات التوصيل في ورقة البيانات الفنية من الشركة المصنعة. راجعها للحصول على البصمة الدقيقة وإرشادات اللحام.
لا تتوفر بيانات مفصلة لمخطط التوصيلات لـ KSZ8873MLLJ.
راجع ورقة البيانات للحصول على تكوين الأطراف الكامل.
التطبيقات النموذجية
KSZ8873MLLJ مناسب لـ 6 التطبيقs: Industrial Ethernet Gateway, Embedded Network Appliance, Automated Equipment Controller, Network Print Server, Set-Top Box and Media Device, IoT Edge Gateway.
Industrial Ethernet Gateway
The KSZ8873MLLJ fits an industrial gateway that must expose three 10/100 copper Ethernet connections while sharing a host processor with other control functions. Its three integrated PHYs avoid a separate media-converter arrangement for each port, while the RMII interface provides a standardized connection to the host MAC. The device's -40 °C to 125 °C operating range supports industrial temperature environments, and I2C or SPI management allows the gateway software to configure VLAN behavior, monitor link states, and supervise switch registers.
موصى به
Embedded Network Appliance
The KSZ8873MLLJ is appropriate for compact appliances that need a small number of Fast Ethernet ports rather than a high-bandwidth multi-gigabit switch. A host processor can connect through the single RMII interface while up to three external devices use 10BASE-T or 100BASE-TX links. Support for 1.8 V, 2.5 V, and 3.3 V operation makes the switch adaptable to mixed-voltage embedded platforms, and managed VLAN filtering helps segment local traffic before it reaches the wider network.
موصى به
Automated Equipment Controller
The KSZ8873MLLJ can serve as the local network hub in automated equipment that connects a controller, service interface, and sensor gateway over copper Ethernet. Its three integrated PHYs provide 10BASE-T and 100BASE-TX support for legacy and Fast Ethernet devices, and the managed switch registers allow deterministic port configuration. The -40 °C to 125 °C range is suitable for equipment deployed in industrial environments, although the complete assembly must remain within its own thermal limits.
موصى به
Network Print Server
The KSZ8873MLLJ fits a print server or embedded network peripheral that needs several 10/100 ports while limiting board area and power use. The host processor communicates through RMII, and three integrated PHYs connect to the print service, management interface, and upstream network segment. VLAN filtering can divide traffic by service or security role, while serial configuration through I2C, SPI, or SMI allows embedded firmware to initialize port settings without relying on a dedicated management controller.
موصى به
Set-Top Box and Media Device
The KSZ8873MLLJ is suitable for set-top boxes, media devices, and other consumer gateways requiring a small number of Ethernet connections. Its 64-LQFP package measures 10 mm by 10 mm, while three integrated PHYs remove the need for three separate Ethernet transceiver sections. The host can use RMII for frame transfer and I2C or SPI for configuration, helping the product provide managed local networking without adding a large switching ASIC to a space-constrained board.
موصى به
IoT Edge Gateway
The KSZ8873MLLJ can serve as the wired Ethernet aggregation point in an IoT edge gateway that links sensors, controllers, and a cloud uplink. Its three 10/100 ports provide manageable bandwidth for ordinary telemetry and control traffic rather than high-speed server workloads. Integrated PHYs simplify the physical-layer implementation, managed VLAN support can isolate device groups, and the -40 °C to 125 °C range accommodates demanding industrial deployments when correctly integrated into the final enclosure.
موصى به
ملخص المنتجات الموصى بها
بيانات مرجعية هندسية لـ KSZ8873MLLJ — المقارنة وإرشادات التصميم ومعلومات الامتثال.
دليل الاختيار
المقارنة مع البدائل
| المعامل | هذا المنتج |
|---|---|
| Brand | Microchip Technology |
| Package | 64-LQFP, 10 mm x 10 mm |
| Port Count | 3 ports |
| Ethernet Speed | 10/100 Mb/s |
| Integrated PHYs | 3 PHYs |
| Host Interface | 1 x RMII |
| Management Interfaces | I2C, SPI, and SMI |
| Supply Voltage Options | 1.8 V, 2.5 V, and 3.3 V |
| Active VLANs | 16 VLANs |
| VLAN Table Capacity | 16 entries |
| Operating Temperature | -40 °C to 125 °C |
| VLAN Identifier Mapping | 12-bit VLAN ID to 4-bit filter ID |
أبرز الفروقات
- Three integrated PHYs in one switch package (مقابلNo verified drop-in alternative)
- Multiple host-management paths (مقابلNo verified drop-in alternative)
- Embedded VLAN segmentation (مقابلNo verified drop-in alternative)
ملاحظات التصميم
Use the 64-LQFP footprint and pin numbering defined by the manufacturer datasheet without substituting a generic 64-LQFP symbol. Assign every power, ground, RMII, clock, reset, management, and Ethernet-port net from the official connection table. Confirm exposed-pad or thermal requirements from the package drawing and place the input and output decoupling capacitors close to their specified pins.
Follow the manufacturer's Ethernet layout guidance for the RMII traces, copper pairs, magnetics, and digital control signals. Keep the RMII clock and data routing short, provide continuous reference planes, avoid routing high-speed signals beneath magnetics or isolated copper regions, and maintain the clearances specified by the datasheet. Management signals should be kept away from sensitive analog and high-speed routing wherever the board topology permits.
Do not treat every KSZ8873 family designation as a footprint-compatible substitute for KSZ8873MLLJ. Before replacing the device, compare the exact package drawing, 64-pin assignments, temperature grade, supply architecture, RMII timing, PHY behavior, VLAN implementation, and management-register map. Also confirm that the Ethernet magnetics and external line components meet the requirements described in the manufacturer datasheet.
Design the supply rails around the selected 1.8 V, 2.5 V, or 3.3 V operating configuration and preserve the manufacturer's recommended bypass network. Place each decoupling capacitor at the corresponding power pin with a short, low-loop-current path to the ground plane. Review startup, reset, and clock requirements as a complete subsystem rather than assuming a generic power tree will satisfy every sequencing condition.
معلومات الامتثال
No explicit RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals statement was identified. The industrial operating range of -40 °C to 125 °C does not by itself constitute AEC-Q100 qualification.
