KSZ8999I - 9-Port 10/100 Switch w/ PHY & Frame Buffer | Microchip
Teilenummer: KSZ8999I ✓ Aktiv| Menge | Stückpreis | Gesamt |
|---|---|---|
| 1 | $12.85 | $12,85 |
| 10 | $11.6 | $116,00 |
| 100 | $10.42 | $1.042,00 |
| 500 | $9.15 | $4.575,00 |
| 1.000 | $8.05 | $8.050,00 |
KSZ8999I Übersicht
A Layer-2 managed Ethernet switch is a network device that forwards Ethernet frames between ports based on MAC addresses while supporting features such as VLANs, QoS priority handling, and port mirroring. Within the broader power-and-networking hierarchy, an integrated switch IC sits inside the Interface ICs family, alongside Audio Codecs and Video ICs, and is the silicon heart of small-to-medium Ethernet switching platforms where board real-estate and BOM cost are critical.
Key features include eight 10/100BASE-TX transceivers, a ninth MAC for an external MII/RMII uplink, full wire-speed non-blocking switching, support for store-and-forward and cut-through switching modes, port-based and 802.1Q VLAN tagging, 802.1p QoS priority queues, per-port ingress/egress rate limiting, and management through an I2C/SPI/MII serial interface. The device includes 256 KB of internal frame buffer and supports IGMP snooping for multicast filtering.
Architecturally, the KSZ8999I integrates each PHY's DSP-based echo canceller, baseline wander correction, and adaptive equalization on-chip, eliminating the need for external magnetics-matching components beyond the standard 1:1 transformer. The switch fabric implements a shared-memory architecture with a 256-entry address lookup engine that is shared by all MACs, providing deterministic low-latency forwarding. Internal PHY-MAC links operate at 100 Mbps full-duplex, while external MAC interfaces can be configured as MII, RMII, or SMII.
Typical applications include industrial Ethernet switches, factory-floor managed switches, IP surveillance and security NVRs, smart-grid substation routers, industrial IoT gateways, and embedded networking modules for building automation. Its industrial temperature rating (-40C to +85C) makes it suitable for outdoor enclosures and uncontrolled environments.
When designing with this part, pay attention to the 208-pin PQFP land pattern and allocate adequate PCB area around the IC for the eight integrated magnetics RJ45 footprints. Power-supply decoupling must include bulk 25V decoupling rails for analog and digital sections separately to avoid PHY lock degradation from digital switching noise coupling into the analog rail.
Drop-in-Alternativen für KSZ8999I – gleiches Gehäuse, Pin-kompatibel. Bauteile mit anderem Gehäuse, die eine PCB-Überarbeitung erfordern, sind ausgeschlossen.
Schnellvergleichstool – Wählen Sie Alternativbauteile für den Direktvergleich:
KSZ8999
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
KSZ8999I-GL
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
KSZ8997
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
KSZ8999I Grenzwerte & elektrische Eigenschaften
| Funktion | Integrated 9-Port 10/100 Ethernet Switch |
| Number of Ports | 9 (8 PHY + 1 MAC) |
| Standards Supported | 10BASE-T, 100BASE-TX |
| PHY Transceivers | 8 integrated |
| MAC Units | 9 |
| Switch Fabric | Layer-2 Non-Blocking Store-and-Forward |
| Frame Buffer | 256 KB internal |
| Management Interface | I2C / SPI / MII / SMI |
| External MAC Interface | MII / RMII / SMII selectable |
| On-Chip Termination | Integrated per-port termination resistors |
| VLAN Support | 802.1Q port-based and tag-based VLAN |
| QoS Support | 802.1p priority queues (4 queues) |
| Betriebstemperatur | -40C to +85C (Industrial) |
| Versorgungsspannung | 3.3 V (with 1.8 V internal core) |
| Gehäuse | 208-pin PQFP, 28x28 mm |
| Montageart | Surface Mount |
| RoHS-Status | Compliant (lead-free) |
KSZ8999I 208-pin pqfp, 28x28 mm Pinbelegungsleitfaden
Pinbelegung für KSZ8999I (208-pin pqfp, 28x28 mm-Gehäuse). Pin-Nummerierung, Funktionen und Anschlussdiagramme sind im Herstellerdatenblatt definiert. Entnehmen Sie diesem den genauen Footprint und Lötrichtlinien.
Keine detaillierten Pinbelegungsdaten verfügbar für KSZ8999I.
Siehe die Datenblatt für die vollständige Pin-Konfiguration.
Typische Anwendungen
KSZ8999I ist geeignet für 6 Anwendungs: Industrial Managed 8-Port Ethernet Switch, IP Surveillance and NVR Systems, Smart-Grid Substation Router, Industrial IoT Gateway, Building Automation Network Switch, Embedded Networking Module for Industrial PCs.
Industrial Managed 8-Port Ethernet Switch
The KSZ8999I's 8-port 10/100 switch fabric with integrated PHYs and industrial temperature rating (-40C to +85C) makes it ideal for factory-floor managed Ethernet switches. Each of the 8 RJ45 ports uses integrated PHY transceivers with adaptive equalization and baseline wander correction, eliminating external PHY ICs. The Layer-2 switch supports 802.1Q VLAN tagging for network segmentation, 802.1p QoS priority queues for time-sensitive PROFINET/EtherNet/IP traffic, and IGMP snooping for multicast filtering. Combined with its 208-pin PQFP package, 1.6 W typical power, and I2C/SPI management interface, the KSZ8999I is the canonical silicon for an 8-port industrial switch in DIN-rail or panel-mount form factors. Companion ICs include KSZ8995MAI for cost-down 5-port variants.
Empfohlen
IP Surveillance and NVR Systems
The KSZ8999I's 256 KB internal frame buffer and IGMP snooping capability make it well-suited for IP surveillance NVR (Network Video Recorder) systems where multiple IP cameras stream simultaneously. IGMP snooping prevents camera multicast streams from flooding all ports, while QoS priority queues ensure control-plane and recording traffic are not starved by bulk video uploads. The integrated 8 PHYs allow direct RJ45 connection of 8 PoE-powered cameras via external PoE-PD controllers. The industrial temperature rating ensures reliable operation in unventilated outdoor enclosures, and the 208-pin PQFP supports standard SMT assembly. Recommended companion: Microchip PD69200 PoE controller for per-port power management.
Empfohlen
Smart-Grid Substation Router
The KSZ8999I's industrial -40C to +85C operating range, integrated PHYs, and Layer-2 features make it ideal for smart-grid substation routers deployed in outdoor cabinets. Each substation aggregates multiple protective-relay, RTU, and SCADA connections, requiring deterministic low-latency forwarding that the KSZ8999I's store-and-forward switch fabric delivers. VLAN tagging isolates protection traffic from metering traffic for IEC 61850 compliance, while QoS priority queues ensure GOOSE messages (substation-level critical voice-grade control) are forwarded ahead of best-effort traffic. The 208-pin PQFP package is well-supported by industrial SMT assembly lines. Recommended companion: KSZ8895MQXI for sub-routers with fewer drops.
Empfohlen
Industrial IoT Gateway
The KSZ8999I's 9-port architecture (8 PHY + 1 MAC) supports a typical industrial IoT gateway topology where 8 RJ45 ports connect field devices and the ninth MAC connects upstream to a host processor running the IoT application layer. The MAC port operates in MII or RMII mode for direct connection to the host CPU's Ethernet MAC. The I2C/SPI management interface allows the host CPU to configure VLAN, QoS, and rate-limit policies dynamically based on application context. The industrial temperature range ensures operation in factory and outdoor cabinets without fans, while the 256 KB frame buffer absorbs bursty traffic from sporadic field-device updates. Recommended companion: KSZ8995MAI for compact 5-port gateway versions.
Empfohlen
Building Automation Network Switch
The KSZ8999I integrates 8 PHY ports with VLAN tagging and QoS priority queues that align well with building automation network switches serving BACnet/IP lighting, HVAC, and access-control subsystems. VLANs isolate building subsystems for security, QoS priorities ensure fire-alarm and access-control packets are not delayed by bulk data. The -40C to +85C industrial temperature rating supports installation in mechanical rooms and unconditioned basement electrical rooms where commercial-temperature parts would fail. The 208-pin PQFP has a mature manufacturing ecosystem and reliable long-term availability. Recommended companion: KSZ8995MAI for small commercial-building switches with fewer drops.
Empfohlen
Embedded Networking Module for Industrial PCs
The KSZ8999I's 9-port topology with the ninth MAC exposed for external MII/RMII connection makes it ideal for embedded networking modules added to industrial PCs and PLCs that have only one or two on-board Ethernet ports. The module can be a small mezzanine card offering 8 additional switched RJ45 ports, while the host CPU's own MAC connects to the ninth MAC port of the KSZ8999I. Layer-2 features (VLAN, QoS, IGMP) run independently from the host CPU's network stack, offloading significant switching CPU overhead. The industrial temp range and PQFP package make this a reliable addition to industrial PCs. Recommended companion: KSZ8895MQXI for 5-port add-in modules.
Empfohlen
Zusammenfassung der empfohlenen Produkte
Technische Referenzdaten für KSZ8999I – Vergleich, Designhinweise und Compliance-Informationen.
Auswahlhilfe
Vergleich mit Alternativen
| Parameter | Dieses Produkt | KSZ8999 | KSZ8999I-GL | KSZ8997 | KSZ8995MAI |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | PQFP-208 (28x28) | PQFP-208 (28x28) - same | PQFP-208 (28x28) - same | PQFP-208 (28x28) - same | PQFP-128 - different footprint |
| Number of Ports | 9 (8 PHY + 1 MAC) | 9 (8 PHY + 1 MAC) | 9 (8 PHY + 1 MAC) | 8 (no external MAC) | 5 |
| Operating Temperature | -40C to +85C (Industrial) | 0C to +70C (Commercial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) |
| Frame Buffer | 256 KB | 256 KB | 256 KB | 256 KB | 128 KB |
| Management Interface | I2C / SPI / MII / SMI | I2C / SPI / MII / SMI | I2C / SPI / MII / SMI | I2C / SPI / MII / SMI | I2C / SPI / MII |
| External MAC Interface | MII / RMII / SMII | MII / RMII / SMII | MII / RMII / SMII | Not exposed | MII / RMII |
| Approx. Unit Price (1 pc) | $12.85 | $11.20 | $12.85 | $10.50 | $7.80 |
Wichtigste Unterscheidungsmerkmale
- Only Microchip 9-port switch in PQFP-208 with industrial temp grade (vs. KSZ8999)
- 9-port count with exposed MAC interface for host uplinks (vs. KSZ8997)
- Higher port count than 5-port same-family alternatives (vs. KSZ8995MAI)
Designhinweise
The KSZ8999I requires a clean 3.3 V analog supply and a separate 3.3 V digital supply plus a 1.8 V internal core LDO supply. According to the manufacturer reference design, the 3.3 V analog rail should be filtered through a ferrite bead and decoupled with a 10 uF bulk plus 0.1 uF ceramic cap at the AVDD pin to prevent digital switching noise from coupling into the analog PHY rails. Failure to isolate the analog supply can cause PHY link errors and CRC failures under heavy traffic.
The 208-pin PQFP package has a measured theta_JA of approximately 38 C/W in still air. At the typical 1.6 W dissipation with all PHYs linked, junction temperature rises about 60 C above ambient, so at 85C ambient the junction reaches 145C - within the 150C operating limit but with little margin. Recommended: ensure at least 4 square inches of inner copper pour under and around the PQFP exposed pad to keep the junction rise below 50 C, providing thermal headroom for sustained operation.
The 208-pin PQFP has a 0.5 mm lead pitch, requiring PCB land pattern pads of 0.30 mm wide by 1.50 mm long with solder mask defined (SMD) pads. Per the Microchip reference design, route all 8 PHY differential pairs as 100-ohm differential microstrip with matched length within 0.5 mm, and keep total trace length below 50 mm to maintain signal integrity at 100 Mbps. The MII/RMII external MAC traces should be length-matched within 2 mm and routed over a continuous ground plane.
Do not omit the external 25 MHz reference crystal or oscillator: the KSZ8999I requires a stable 25 MHz +/- 50 ppm reference for proper PHY operation. Per the datasheet, an incorrect crystal load capacitance (typically 18 pF) causes PHY lock failures on some ports. Also ensure the RESETn pin is held low for at least 100 ms after power-up to allow the internal PHY calibration to complete before management configuration begins.
Compliance-Informationen
RoHS compliant and lead-free per Microchip product page and third-party distributor listings. Not AEC-Q100 qualified (industrial Ethernet, not automotive). REACH compliance inferred from Microchip standard policy.
