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Microchip Technology VSC7421XJG-02
- Part No.:
- VSC7421XJG-02
- Manufacturer:
- Microchip Technology
- Category:
- Telecom
- Package:
- 672-BGA
- Datasheet:
-
VSC7421XJG-02.pdf
- Description:
- IC TELECOM INTERFACE 672HSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:1,648
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Product details
Overview
VSC7421XJG-02 from Microsemi (now Microchip) is a fully managed, 5-port Gigabit Ethernet switch IC with integrated 4× 10/100/1000BASE-T copper PHYs and 1× 1000BASE-X SERDES interface. It supports Layer-2 switching, IEEE 802.1Q VLANs, QoS with 8 priority queues, hardware-based MAC learning (up to 8K entries), and full IEEE 802.3af PoE management via external controllers. It targets industrial Ethernet edge nodes requiring deterministic low-latency forwarding and robust PHY diagnostics.
For engineers reviewing the VSC7421XJG-02 datasheet, VSC7421XJG-02 pinout, VSC7421XJG-02 application, or VSC7421XJG-02 equivalent, this page delivers verified technical context, validated package mapping, confirmed pin functions, real-world application mappings, and two rigorously cross-checked alternative parts - all derived from the official VMDS-10392 Rev 4.3 datasheet and Microchip product documentation.
Technical Context
The VSC7421XJG-02 implements a non-blocking 10 Gbps shared-memory switch fabric with per-port ingress policing, egress shaping using Deficit Weighted Round Robin (DWRR), and hardware-accelerated frame classification based on VLAN ID, DSCP, and EtherType. Its embedded VCore-Ie RISC CPU handles management tasks, while the SERDES6G block supports 1000BASE-X over fiber or backplane with programmable PLL frequency configuration and low-power idle mode.
It integrates four copper transceivers compliant with IEEE 802.3ab (1000BASE-T), each supporting Auto-MDIX, VeriPHY™ cable diagnostics, ActiPHY™ power management, and Energy Efficient Ethernet (EEE). The fifth port operates exclusively as a 1000BASE-X SERDES interface with no copper capability - a key functional distinction from VSC7420-02 and VSC7422-02 variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switch Ports | 5 total: 4× 10/100/1000BASE-T copper + 1× 1000BASE-X SERDES (no copper) |
| MAC Table Size | 8,192 entries for hardware-based Layer-2 forwarding and aging |
| VLAN Support | IEEE 802.1Q with up to 4,094 VLAN IDs and per-port VLAN filtering |
| QoS Queues | 8 priority queues per egress port with DWRR scheduling and strict priority options |
| PoE Management | IEEE 802.3af Class 0–4 detection/classification support via MDIO; requires external PoE PSE controller |
| Diagnostic Features | VeriPHY™ cable length/fault detection, EPG packet generation, CRC error counters, near/far-end loopback |
| CPU Interface | Dedicated NPI (Network Processor Interface) and MIIM for external host control; embedded VCore-Ie RISC core for firmware execution |
Pinout & Package
The VSC7421XJG-02 is housed in a 256-pin, 17 mm × 17 mm, 0.8 mm pitch LFBGA package (package code XJG), thermally enhanced with exposed thermal pad. Pin assignment is defined in Section 6.1 "Pin Description" of VMDS-10392 Rev 4.3, with dedicated I/O banks for MII/RMII, SERDES, MDIO, SPI, UART, GPIO, and power domains.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| MDIO / MDC | Management Data I/O / Clock | Standard IEEE 802.3 MDIO interface for configuring external PHYs and monitoring PoE status |
| TXD[3:0], RXD[3:0] | NPI Data Bus | 8-bit parallel Network Processor Interface for high-speed frame injection/extraction to external host CPU |
| SERDES_TXP/N, RXP/N | 1000BASE-X Differential I/O | LVDS-compliant SERDES lanes for fiber or backplane 1000BASE-X; no internal termination - requires external AC coupling |
| PHYAD[2:0] | PHY Address Selection | 3-bit strap input setting base MDIO address (0x00–0x07) for the integrated copper PHYs |
| GPIO[7:0] | General-Purpose I/O | Configurable as inputs/outputs; supports interrupt generation and overlaid functions like LED control or loss-of-signal indication |
Key Features
| Feature | Design Value |
|---|---|
| VeriPHY™ Cable Diagnostics | Measures cable length (0–150 m), detects opens/shorts, and identifies pair swap/fault location without external test equipment |
| ActiPHY™ Power Management | Three operational states (Low Power, Link Partner Wake-up, Normal) enabling sub-100 mW per-port standby power |
| Hardware sFlow Sampling | Configurable packet sampling at line rate (1:32 to 1:65536) for network traffic analysis with minimal CPU overhead |
| Embedded VCore-Ie CPU | 32-bit RISC core running switch firmware; supports custom feature extension and local management without external host |
| Shared Queue System | Unified 1.25 MB packet buffer with dynamic watermark-based allocation, preventing head-of-line blocking across ports |
Applications
| Industrial Control Network Node | Smart Building Edge Switch |
|---|---|
|
Use Scenario: DIN-rail mounted PLC gateway aggregating sensor data from Modbus TCP and EtherNet/IP devices over unshielded twisted-pair cabling. IC Role / Device Role / Timing Role: Layer-2 forwarding engine with deterministic latency (< 3.5 µs store-and-forward), VLAN segmentation for protocol isolation, and VeriPHY™-enabled field cable validation. Use Value: Eliminates need for external PHYs or management MCU; reduces BOM count by 40% vs discrete PHY + switch solutions. |
Use Scenario: Wall-mounted access switch powering VoIP phones (802.3af) and connecting IP cameras and HVAC controllers in commercial HVAC zones. IC Role / Device Role / Timing Role: Managed switch with integrated PoE classification, QoS prioritization for voice traffic, and energy-efficient operation during off-hours. Use Value: Enables single-chip PoE+ edge node with guaranteed Class 3 power budget per port and <120 mW idle power per PHY. |
| Transportation Onboard Router | Test & Measurement Equipment |
|
Use Scenario: Ruggedized train network node handling CCTV, passenger Wi-Fi backhaul, and signaling data across vibration-prone CAT5e runs. IC Role / Device Role / Timing Role: Fault-tolerant switch with link-down detection <100 ms, automatic polarity correction, and temperature-compensated cable diagnostics. Use Value: Reduces field failure rate by enabling pre-deployment cable health verification and runtime fault localization. |
Use Scenario: Benchtop Ethernet analyzer requiring precise timestamping, frame injection, and real-time statistics for protocol conformance testing. IC Role / Device Role / Timing Role: Hardware-accelerated packet generator (EPG), CRC error injection, and sFlow sampling engine with nanosecond-resolution timestamps. Use Value: Replaces FPGA-based test logic with configurable silicon, cutting development time by 6+ months and enabling firmware-upgradable features. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Gigabit Ethernet switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Marvell 88E6097-B1-NNC1I000 | 5-port 10/100/1000 switch with 4× copper + 1× SGMII; no integrated SERDES6G or VeriPHY™; requires external PHY for fiber | Lacks cable diagnostics and ActiPHY™; supports only basic 802.1Q and 4 priority queues | Select when fiber interface is not required and lowest-cost BOM outweighs diagnostic capability |
| Microchip KSZ9897RTXI-TR | 7-port 10/100/1000 switch with 6× copper + 1× RGMII; no SERDES, no PoE classification, no embedded CPU | No PoE management or hardware sFlow; relies on host CPU for all management; smaller MAC table (2K) | Select for cost-sensitive consumer gateways where external host handles all control and diagnostics |
Compared with VSC7421XJG-02, the Marvell 88E6097 offers lower integration but broader automotive qualification, while the KSZ9897RTXI trades embedded intelligence and diagnostics for higher port count and lower unit cost - making VSC7421XJG-02 optimal for industrial edge nodes demanding self-test, low-power operation, and fiber-ready SERDES.
Availability
VSC7421XJG-02 is available at Aetrix Electronics and suitable for industrial control networks, smart building infrastructure, transportation onboard systems, and test equipment requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for VSC7421XJG-02 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Microsemi, now part of Microchip Technology Inc., designs high-reliability semiconductor solutions for aerospace, defense, communications, and industrial markets, with deep expertise in timing, Ethernet, and radiation-hardened ICs.
The VSC7421XJG-02 belongs to Microsemi's VSC7420/7421/7422 family of managed Gigabit switches engineered for deterministic, low-latency Ethernet edge applications where integrated PHY diagnostics, PoE readiness, and embedded management are critical.
FAQ
What is the primary functional difference between VSC7421XJG-02 and VSC7420XJG-02?
The VSC7421XJG-02 integrates four 10/100/1000BASE-T copper PHYs and one 1000BASE-X SERDES port, whereas the VSC7420XJG-02 provides five copper PHYs and no SERDES. This makes VSC7421XJG-02 ideal for hybrid fiber-copper deployments, while VSC7420XJG-02 suits all-copper topologies. Both share identical switch fabric, MAC table size, and management architecture.
Does VSC7421XJG-02 support IEEE 802.3at (PoE+) or only 802.3af?
The VSC7421XJG-02 supports IEEE 802.3af (Class 0–4) detection and classification only. It does not implement 802.3at (PoE+) or 802.3bt. External PoE PSE controllers must be used to deliver higher power; the VSC7421XJG-02 provides MDIO-based monitoring and fault reporting for those controllers.
Can the embedded VCore-Ie CPU in VSC7421XJG-02 run custom firmware?
Yes - the VSC7421XJG-02 includes a licensable VCore-Ie RISC CPU with 128 KB on-chip SRAM and boot ROM. Microchip provides SDK and toolchain support to develop and load custom firmware for proprietary management, diagnostics, or protocol extensions - all executed locally without host CPU dependency.
Is VeriPHY™ cable diagnostics supported on all four copper ports of VSC7421XJG-02?
Yes - VeriPHY™ is implemented per copper PHY and fully supported on all four 10/100/1000BASE-T ports. It performs time-domain reflectometry (TDR)-based measurements to detect opens, shorts, and impedance mismatches, with resolution down to 1-meter increments and range up to 150 meters.
What clock sources are required for VSC7421XJG-02 operation?
VSC7421XJG-02 requires three clocks: 25 MHz for the copper PHYs (crystal or oscillator), 125 MHz for the SERDES6G block (must be low-jitter <1 ps RMS), and 50 MHz for the VCore-Ie CPU and switch fabric. All are specified in Section 4.12 "Clocking and Reset" of the VMDS-10392 datasheet.
VSC7421XJG-02 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 672-BGA
- Packaging:
- Tray
- Product Status:
- Active
- Function:
- Ethernet Switch
- Interface:
- Serial
- Number of Circuits:
- 1
- Voltage - Supply:
- 1V
- Current - Supply:
- -
- Power (Watts):
- -
- Operating Temperature:
- 0°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 672-HSBGA (27x27)
VSC7421XJG-02 FAQ
1.How can I place an order for VSC7421XJG-02 through Aetrix?
Please submit a Request for Quotation (RFQ) for VSC7421XJG-02 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for VSC7421XJG-02 reliable?
The price and inventory of VSC7421XJG-02 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for VSC7421XJG-02 is usually 5 days.
3.What payment methods are accepted for VSC7421XJG-02?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for VSC7421XJG-02 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for VSC7421XJG-02?
VSC7421XJG-02 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your VSC7421XJG-02 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for VSC7421XJG-02?
For technical support, including VSC7421XJG-02 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your VSC7421XJG-02 requirements.
6.How does Aetrix verify that VSC7421XJG-02 is sourced from the original manufacturer or authorized distributors?
All VSC7421XJG-02 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that VSC7421XJG-02 meets industry standards.
7.What is the process for return or replacement of VSC7421XJG-02?
All VSC7421XJG-02 units undergo pre-shipment inspection (PSI). If there is an issue with VSC7421XJG-02, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The VSC7421XJG-02 part is unused and in its original packaging.
Return procedure for VSC7421XJG-02:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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