KSZ9021GQ - Gigabit Ethernet Transceiver | Microchip
MPN: KSZ9021GQ ✗ انتهى عمره الإنتاجيKSZ9021GQ نظرة عامة
A Gigabit Ethernet transceiver is an interface IC that combines transmit and receive functions between a digital MAC and twisted-pair copper cabling. Within the network hierarchy, it connects an Ethernet MAC or switching silicon to 10/100/1000Base-T media, converting parallel digital traffic into physical-layer signaling and receiving signaling for delivery to the MAC. The GMII and MII interfaces provide standardized paths to compatible processors, switches, and controllers.
The supplied data identifies full-duplex Gigabit Ethernet operation, 8/8 transceiver classification, GMII/MII compatibility, and a 3.3 V operating supply. Production-oriented features include parametric NAND tree fault detection, Micrel LinkMD time-domain-reflectometry cable diagnostics, and remote plus local loopback. These diagnostics help locate board I/O faults and faulty copper cabling during system bring-up, deployment, and manufacturing test.
The KSZ9021GQ uses IEEE 802.3 Clause 28 auto-negotiation for UTP link partners. This allows 10 Mbps, 100 Mbps, or 1000 Mbps operation according to shared link capability rather than a fixed manual speed assumption. Its diagnostic architecture therefore supports both link establishment and fault isolation in industrial networking, embedded systems, communications equipment, test systems, and production lines.
Typical deployments include single-port embedded Ethernet designs, industrial controllers, network interface adapters, communication appliances, and Gigabit switches. Designers should preserve the datasheet's recommended power, decoupling, magnetics, and copper-layout topology because high-speed analog performance depends on controlled supply noise, impedance, return paths, and transformer integration. Pin-level electrical and timing details must be taken directly from the manufacturer datasheet.
A key sourcing consideration is package replacement. The KSZ9021GQ uses a 128-pin PQFP, whereas the related KSZ9021GN uses a 64-pin QFN. Those package options are not pin-compatible drop-in replacements for an existing 128-pin PCB, so migration requires a redesign rather than simple component substitution. Confirm availability, price, and lifecycle status with an authorized distributor before committing a production BOM.
This page consolidates the verified manufacturer and distributor details for the KSZ9021GQ, adds diagnostics and interface context, and distinguishes true footprint compatibility from related but mechanically different KSZ9021 package variants. It is intended to accelerate engineering review while keeping unspecified electrical values explicitly marked for datasheet verification.
بدائل مباشرة لـ KSZ9021GQ — نفس الحزمة، متوافق دبوس بدبوس. تُستثنى القطع ذات الحزم المختلفة التي تتطلب تعديل PCB.
الطرازات في هذه السلسلة
طرازات من نفس السلسلة متوافقة تمامًا مع KSZ9021GQ (نفس عامل الشكل والبصمة) — يختلف في Package, Auto-MDIX, Auto-Negotiation, Function, Supply Voltage.
لا تتوفر بدائل متوافقة تمامًا لهذا المنتج.
اطلب بدائلKSZ9021GQ المواصفات
| Product Type | Single-port Gigabit Ethernet transceiver |
| Supported Ethernet Speeds | 10/100/1000 Mbps |
| Supported Media | 10/100/1000Base-T |
| Digital Host Interface | GMII/MII |
| GMII Data Rate | 1000 Mbps |
| MII Data Rates | 10 Mbps and 100 Mbps |
| جهد التغذية | 3.3 V |
| Transceiver Classification | 8/8 transceiver |
| Auto-Negotiation Standard | IEEE 802.3 Clause 28 |
| Cable Type | UTP |
| العلبة | 128-pin lead-free PQFP, 14 x 20 mm |
| نوع التركيب | Surface mount |
| Cable Diagnostic Method | Micrel LinkMD TDR-based diagnostics |
| Board Fault Detection | Parametric NAND tree support |
| Loopback Modes | Remote and local |
دليل تكوين أطراف KSZ9021GQ 128-pin lead-free pqfp, 14 x 20 mm
تكوين الأطراف لـ KSZ9021GQ (حزمة 128-pin lead-free pqfp, 14 x 20 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 KSZ9021GQ.
راجع ورقة البيانات للحصول على تكوين الأطراف الكامل.
التطبيقات النموذجية
KSZ9021GQ مناسب لـ 6 التطبيقs: Embedded Gigabit Ethernet Interfaces, Industrial Network Gateways, Network Interface Adapters, Gigabit Ethernet Switching Equipment, Network Test and Production Equipment, Communication and Control Equipment.
Embedded Gigabit Ethernet Interfaces
The KSZ9021GQ fits an embedded processor or switching SoC that needs a copper 10/100/1000Base-T port with GMII or MII connectivity. Its 1 Gbps GMII path supports Gigabit operation, while the same transceiver family supports 10 and 100 Mbps rates through MII. A typical design places the transceiver between the MAC and an Ethernet transformer, then uses Clause 28 auto-negotiation to establish the highest mutually supported speed. LinkMD cable diagnostics and loopback functions add production value by helping verify the assembled board and installed copper link. Verify exact timing, supply sequencing, and pin assignments in the Microchip datasheet before PCB implementation.
موصى به
Industrial Network Gateways
The KSZ9021GQ is appropriate for gateways that bridge embedded control equipment to 10/100/1000Base-T networks. A single GMII connection can carry traffic at 1000 Mbps, while MII support permits lower-rate links on compatible designs. Clause 28 auto-negotiation lets the gateway accommodate mixed-speed infrastructure without assuming that every network port supports Gigabit Ethernet. Remote and local loopback modes support factory verification, while the NAND tree and LinkMD diagnostics help isolate board or cabling faults. Industrial suitability still requires checking the operating-temperature and qualification data, which are not present in the supplied verification set.
موصى به
Network Interface Adapters
A PCIe, storage, or embedded add-in card can use the KSZ9021GQ as its Gigabit Ethernet physical-layer interface. The device communicates with a host controller through GMII/MII and connects to external copper cabling through the network transformer. At 1000 Mbps, the GMII path provides full-duplex data transfer, while support for 10/100 Mbps maintains compatibility with slower links. Built-in loopback and cable diagnostics can streamline production testing and field troubleshooting. Board-level implementation still requires careful termination, controlled-impedance routing, supply decoupling, and isolation between digital host signals and the analog copper interface.
موصى به
Gigabit Ethernet Switching Equipment
The KSZ9021GQ can provide a single-port copper uplink in a switch, gateway, or communications appliance that uses a compatible GMII/MII MAC. It supports 1000 Mbps through GMII and 10/100 Mbps operation through MII, allowing interoperability across common Ethernet link rates. Auto-negotiation selects the highest common mode with the UTP link partner. Diagnostics are especially useful in managed network equipment because NAND tree testing can identify board-level I/O faults, LinkMD can locate cabling issues, and loopback can verify the data path. Exact interface timing and clocking must be validated against both the host controller and KSZ9021 datasheets.
موصى به
Network Test and Production Equipment
The KSZ9021GQ's diagnostics make it relevant to test systems and production fixtures that need an active Ethernet endpoint rather than a passive jack. Parametric NAND tree support can detect opens or faults between transceiver I/Os and the board, while Micrel LinkMD TDR-based cable diagnostics can identify faulty copper cabling. Remote and local loopback modes provide controlled data-path checks during board bring-up and production. The 128-pin PQFP package supports a conventional surface-mount assembly flow but requires careful thermal and copper-plane design. For automated test, coordinate stimulus and result handling with the host MAC or test controller documented in the device interface.
موصى به
Communication and Control Equipment
KSZ9021GQ-based communication or control equipment can expose a copper Ethernet management or data port alongside embedded processors. Its support for 10/100/1000 Mbps rates through MII and GMII provides deployment flexibility across office, industrial, and plant networks. Clause 28 auto-negotiation automatically accommodates the highest shared rate, reducing configuration errors in the field. When equipment is installed far from technicians, LinkMD diagnostics and loopback functions help distinguish software, board, and cabling problems. Deployment in a specific enclosure should additionally verify thermal performance, surge protection, isolation, and environmental limits because those values are not supplied in the verified dataset.
موصى به
ملخص المنتجات الموصى بها
بيانات مرجعية هندسية لـ KSZ9021GQ — المقارنة وإرشادات التصميم ومعلومات الامتثال.
دليل الاختيار
المقارنة مع البدائل
| المعامل | هذا المنتج |
|---|---|
| Brand | Microchip Technology |
| Package | 128-pin lead-free PQFP, 14 x 20 mm |
| Product Type | Single-port Gigabit Ethernet transceiver |
| Supported Speeds | 10/100/1000 Mbps |
| Supply Voltage | 3.3 V |
| Host Interface | GMII/MII |
| Auto-Negotiation | IEEE 802.3 Clause 28 |
| Cable Diagnostics | Micrel LinkMD TDR-based diagnostics |
| Fault Detection | Parametric NAND tree support |
| Loopback | Remote and local |
| Unit Price | $4.9832 as of 2026-10-22 |
ملاحظات التصميم
Route GMII and MII signals as controlled-impedance digital interconnects and keep the copper Ethernet section aligned with the manufacturer's recommended magnetics and layout topology. The KSZ9021 combines a digital MAC-facing interface with a sensitive physical-layer transceiver, so return paths, plane transitions, connector placement, and separation from switching nodes can affect signal integrity. Use the official pin and layout guidance in the KSZ9021GQ datasheet rather than deriving the 128-pin PQFP footprint from the 64-pin GN layout.
Follow the datasheet's recommended supply topology, decoupling, and power-sequence requirements for every rail. Although the verified device description specifies a 3.3 V supply, it does not provide all current ratings, tolerance limits, or timing values. Decoupling locations should be minimized between each regulator and the relevant KSZ9021GQ power pin, while analog and digital return currents should be managed according to the manufacturer layout guidance. Check the full electrical table before calculating capacitor ratings or regulator headroom.
Do not substitute the 64-pin KSZ9021GN for the 128-pin KSZ9021GQ without a board redesign. Although both are in the KSZ9021 family, the verified Microchip information identifies different package types and pin counts. A functional Ethernet transceiver is not necessarily a pin-compatible substitute. Before replacement, compare land patterns, power pins, GMII/MII pin assignments, clocks, control signals, thermal performance, and diagnostic functions against both official datasheets.
معلومات الامتثال
Microchip identifies KSZ9021GQ as a lead-free 128-pin PQFP. No verified RoHS, REACH, AEC-Q100, halogen-free, or conflict-minerals statement was supplied.
