KSZ8851SNL - 10/100 Ethernet Controller | Microchip
Teilenummer: KSZ8851SNL ✓ AktivKSZ8851SNL Übersicht
An Ethernet controller is an interface IC that integrates network-frame handling with physical-layer signaling. The KSZ8851 family combines the PHY and MAC with an SPI host interface, reducing the number of external components required to add wired Ethernet to a microcontroller-based product. This integration places the KSZ8851 within the hierarchy of Ethernet controller, network interface controller, interface IC, and semiconductor. Its SPI host interface supports a compact connection to embedded processors while preserving an independent Ethernet data path.
The principal verified features are 10/100BASE-T/TX operation, a 3.3 V supply as identified by the distributor specification snippet, and a 32-pin lead-free QFN package. The integrated controller architecture simplifies firmware and hardware compared with a separated Ethernet MAC and external PHY arrangement. A single-port design also keeps board area and component count controlled, which is valuable in embedded products where connector placement, enclosure volume, and system cost are constrained.
Technically, the KSZ8851SNL separates host access from Ethernet processing through its Serial Peripheral Interface. The SPI interface provides a compact communication path for register access, configuration, interrupt handling, and Ethernet data transfer. The integrated PHY handles the physical signaling required for 10/100BASE-T/TX copper networking, while the MAC performs the higher-level frame-processing functions required to present Ethernet traffic to the host processor.
Typical applications include industrial Ethernet gateways, building-automation controllers, serial-to-Ethernet equipment, embedded test systems, HMI platforms, and network-connected sensors. It is also appropriate for custom industrial control equipment requiring a dedicated Ethernet port without allocating a high-performance host processor for basic Ethernet connectivity. The 5 mm x 5 mm QFN package supports compact designs, although exposed-pad layout and thermal management remain PCB-level concerns.
Designers should follow Microchip's KSZ8851SNL Hardware Design Checklist for power, decoupling, magnetics, differential routing, and copper interface implementation. SPI trace integrity, grounding, and isolation requirements must be reviewed alongside the Ethernet physical layer because the controller is intended for copper-connected industrial networks rather than direct cable attachment without supporting network hardware.
Drop-in-Alternativen für KSZ8851SNL – gleiches Gehäuse, Pin-kompatibel. Bauteile mit anderem Gehäuse, die eine PCB-Überarbeitung erfordern, sind ausgeschlossen.
Für dieses Produkt sind keine Drop-in-Alternativen verfügbar.
Alternativen anfordernKSZ8851SNL Technische Daten
| Product Type | Single-port Fast Ethernet controller |
| Ethernet Speed | 10 Mbps and 100 Mbps |
| Ethernet Standard | 10/100BASE-T/TX |
| Host Interface | Serial Peripheral Interface (SPI) |
| Integrated Blocks | 10/100 PHY, MAC, and SPI interface |
| Copper Port Count | 1 port |
| Uplink Port Count | 1 port |
| Versorgungsspannung | 3.3 V |
| Gehäuse | 32-pin QFN, 5 mm x 5 mm |
| Package Family | QFN surface-mount family |
| Montageart | Surface mount |
| Lead-Free Packaging | Lead-free package |
| Ethernet Media | Copper Ethernet |
| Introduction Date | June 1, 2008 |
| Halogen-Free Status | Compliant |
KSZ8851SNL qfn surface-mount family Pinbelegungsleitfaden
Pinbelegung für KSZ8851SNL (qfn surface-mount family-Gehäuse). Pin-Nummerierung, Funktionen und Anschlussdiagramme sind im Herstellerdatenblatt definiert. Entnehmen Sie diesem den genauen Footprint und Lötrichtlinien.
Keine detaillierten Pinbelegungsdaten verfügbar für KSZ8851SNL.
Siehe die Datenblatt für die vollständige Pin-Konfiguration.
Typische Anwendungen
KSZ8851SNL ist geeignet für 6 Anwendungs: Industrial Ethernet Gateway, Building Automation Controller, Serial-to-Ethernet Equipment, Embedded Test and Measurement, Networked Sensor and Condition Monitor, Communications and Remote I/O.
Industrial Ethernet Gateway
The KSZ8851SNL is suitable for a compact gateway that gives a microcontroller-based industrial controller a dedicated 10/100BASE-T/TX connection. Its integrated PHY and MAC remove the need to connect an external Ethernet PHY to a separate MAC implementation, while SPI supplies a compact host-control path. The 32-pin, 5 mm x 5 mm QFN helps limit board area in DIN-rail, panel, and edge equipment. Before release, verify operating temperature, EMC, isolation, surge, and industrial lifecycle requirements against the manufacturer datasheet and local standards.
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Building Automation Controller
The KSZ8851SNL can add wired Ethernet to a building-automation controller without giving the host MCU a dedicated parallel network bus. Its 10 Mbps and 100 Mbps support covers common supervisory and control traffic, while the integrated MAC and PHY simplify the hardware boundary between the host processor and copper network. The 5 mm x 5 mm QFN is useful in space-constrained room controllers and gateways. Compliance, environmental ratings, and isolated-network requirements must be validated separately for each building installation.
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Serial-to-Ethernet Equipment
The KSZ8851SNL fits serial-to-Ethernet products where a host MCU or MPU must bridge a local serial protocol to a 10/100 network. The SPI host interface supports register access and data movement while the integrated PHY and MAC handle the copper Ethernet side. This arrangement can reduce connector count and board area compared with a discrete MAC-plus-PHY design. Firmware must provide the required framing, protocol conversion, buffering, and network-management functions because the controller itself is not a complete serial protocol gateway.
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Embedded Test and Measurement
The KSZ8851SNL can provide network connectivity for compact test, measurement, and diagnostic instruments that already contain an SPI-capable controller. A 100 Mbps Ethernet link is suitable for supervisory data, instrument control, status reporting, and moderate data transfer, while the integrated controller reduces external component count. The 32-pin QFN permits placement near the board edge and network connector. Designers should confirm timing margin, sustained-data-rate behavior, thermal performance, and network-driver integration directly from Microchip documentation.
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Networked Sensor and Condition Monitor
The KSZ8851SNL is appropriate for a wired condition-monitoring node that must forward measurements, alarms, or configuration data through Ethernet. Integrating the 10/100 PHY and MAC into one controller allows a sensor hub to retain a compact MCU-centered architecture, and SPI provides a deterministic host connection for the data path. The device supports 10 Mbps and 100 Mbps operation for common industrial networks. Confirm MCU processing capacity, interrupt latency, thermal conditions, and environmental compliance before assigning communications as the primary system function.
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Communications and Remote I/O
The KSZ8851SNL can serve as the Ethernet interface in a compact remote-I/O or communications module driven by an embedded processor. Its integrated MAC, PHY, and SPI interface creates a clear division between network signaling and the host application processor. Support for both 10 and 100 Mbps allows interoperability with existing copper-network infrastructure, while the 5 mm x 5 mm QFN supports densely populated control hardware. Production designers should verify sustained throughput, watchdog recovery behavior, boot sequencing, and exact network-isolation requirements.
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Zusammenfassung der empfohlenen Produkte
Technische Referenzdaten für KSZ8851SNL – Vergleich, Designhinweise und Compliance-Informationen.
Auswahlhilfe
Vergleich mit Alternativen
| Parameter | Dieses Produkt |
|---|---|
| Brand | Microchip Technology |
| Package | 32-pin QFN, 5 mm x 5 mm |
| Ethernet Speed | 10 Mbps and 100 Mbps |
| Ethernet Media | 10/100BASE-T/TX copper Ethernet |
| Host Interface | SPI |
| Integrated PHY | Yes |
| Integrated MAC | Yes |
| Supply Voltage | 3.3 V |
| Port Count | 1 copper port and 1 uplink port |
| Lead-Free Packaging | Lead-free |
Wichtigste Unterscheidungsmerkmale
- Integrated three-function Ethernet controller (vs. KSZ8851SNL-EVAL)
- SPI-connected embedded architecture (vs. KSZ8851SNL-TR)
- Single-port connectivity with copper and uplink interfaces (vs. KSZ8851SNLI-TR)
Designhinweise
Follow Microchip's KSZ8851SNL Hardware Design Checklist before releasing the PCB. The checklist specifically covers the 10/100BASE-T/TX controller, one copper port, one uplink port, and SPI interface. Preserve the manufacturer-recommended land pattern, exposed-pad connections, decoupling locations, differential-pair geometry, and copper-interface layout; do not derive these details from the package dimensions alone.
Treat the Ethernet differential pairs and SPI signals as controlled-impedance nets rather than general-purpose routing. Apply the reference stack-up and geometry from the manufacturer design checklist, minimize stubs and unnecessary vias, and provide a continuous ground reference. Since the exact trace dimensions and stack-up data were not included in the verified excerpts, numerical impedance targets require confirmation from the official design documentation.
Design the 3.3 V supply path using the manufacturer's recommended capacitance and placement requirements. Place high-frequency bypass capacitors close to the relevant supply pins and keep switching-regulator and Ethernet magnetics layouts away from sensitive SPI and differential-pair routing. The supplied data does not verify the complete power-decoupling network, so component values must be taken from the official datasheet rather than inferred.
Do not treat KSZ8851SNL-TR as a functional substitute during schematic review; it is the distributor ordering suffix for the target's production packing. Likewise, KSZ8851SNL-EVAL is an evaluation board and KSZ8851SNLI-TR is an ordering variant listed by cross-reference search. Verify the actual device markings, temperature grade, package, interface, and lifecycle status against the chosen ordering code before approving a BOM.
Compliance-Informationen
The verified cross-reference excerpt identifies the KSZ8851 family as halogen-free compliant, and Microchip's evaluation-board page describes the KSZ8851SNL package as lead-free. RoHS, REACH, conflict-minerals, and automotive qualification status were not explicitly established for the exact orderable MPN in the supplied data.
