KSZ8873MLL

KSZ8873MLL is a Microchip (formerly Micrel) 3-port Fast Ethernet switch IC. It provides three 10/100BASE-T interfaces with an integrated switch core and MAC/PHY, allowing an MCU/SoC to connect to a LAN without a separate switch device. Key features (per datasheet) include store-and-forward switching, IEEE 802.1Q VLAN tagging, QoS, basic management via MDIO/MDC, auto-negotiation, and auto-MDI/MDIX. It’s intended for embedded/industrial applications (gateways, controllers, small LAN nodes) and comes in the MLL package for compact boards. External magnetics are typically required per port, as with many 10/100 PHYs.

KSZ8873MLL is a 3‑port unmanaged 10/100 Ethernet switch IC. Common equivalents include:
- Microchip/Micrel KSZ8863 family
- Realtek RTL8303 series (3‑port 10/100)
- Marvell/Broadcom small 3‑port 10/100 switch ICs
Verify pinout, package, PHY/MAC interfaces and features against datasheets for a drop‑in replacement.

Here are the typical features of KSZ8873MLL (a 3-port Fast Ethernet switch/PHY device from Microchip/Micrel):
- 3 independent 10/100BASE-TX ports with integrated MAC/PHY
- Auto-negotiation and auto-MDIX on all ports
- Non-blocking switching fabric with dynamic MAC address learning
- VLAN support: port-based and IEEE 802.1Q tagging
- Quality of Service: 802.1p prioritization and multiple traffic queues
- Multicast support with IGMP snooping/filtering
- Spanning Tree Protocol (RSTP/MSTP) support
- Management via a simple serial control interface with a register map (SPI/I2C-style)
- Low-power modes and protection features (ESD/EMI)
- Optional jumbo frame support (depending on configuration)
- Suitable for standalone switch or host-coexisting configurations
Note: exact interface details (host interface type, register map, timing, and voltage ranges) vary by revision and packaging. For precise specs, consult the KSZ8873MLL datasheet from Microchip.

KSZ8873MLL is supplied in a 32-pin QFN (MLL) package. Its function: a compact 3‑port 10/100 Mbps Ethernet switch IC with three integrated PHYs (one CPU/MAC port + two PHY ports), supporting MII/RMII interfaces, MDIO/SMI management, auto‑negotiation, flow control, VLAN and QoS features for unmanaged/embedded switching.

The KSZ8873MLL is manufactured by Microchip Technology Inc. (originally from Micrel; Micrel was acquired by Microchip in 2015). Microchip is a publicly traded semiconductor company that designs and manufactures integrated circuits—microcontrollers, analog and mixed-signal devices, power management, and networking components (including Ethernet PHYs and switches) for embedded and communications applications.

KSZ8873MLL is a 3-port 10/100 Ethernet switch/PHY for compact embedded networks. Typical application areas include:
- Embedded systems and IoT gateways needing multiple Ethernet ports
- Consumer electronics (set-top boxes, IP cameras, printers, AV/networked devices)
- Small business networking gear (mini routers, VPN/firewall boxes, NAS/NVR hubs)
- Industrial automation (PLC/HMI gateways, remote I/O, industrial PCs)
- Surveillance systems and multi-camera hubs
- Building automation and smart energy meters
(Uses: VLAN/QoS features common to small/embedded networks.)

The KSZ8873MLL is supplied in a 48-pin QFN (no-leads) package with a 7 × 7 mm body. See the KSZ8873 datasheet for exact mechanical dimensions and recommended land pattern.