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Microchip Technology VSC8501XML
- Part No.:
- VSC8501XML
- Manufacturer:
- Microchip Technology
- Category:
- Telecom
- Package:
- -
- Datasheet:
-
VSC8501XML.pdf
- Description:
- IC TELECOM INTERFACE 135QFN
- Quantity:
- Payment:
- Shipping:
Inventory:224
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Product details
Overview
VSC8501XML from Microchip Technology is a single-port 10/100/1000BASE-T Ethernet PHY transceiver with integrated line-side termination, RGMII/GMII/MII MAC interface, and Synchronous Ethernet support. It delivers IEEE 802.3ab-compliant copper connectivity, <1 ms fast link failure indication, and EcoEthernet™ v2.0 power management for space-constrained industrial and telecom infrastructure applications.
For engineers reviewing the VSC8501XML datasheet, VSC8501XML pinout, VSC8501XML application, or VSC8501XML equivalent, key selection criteria include its –40°C to 125°C junction operating range, 135-pin QFN package with exposed pad, recovered clock output with programmable squelch, and support for IEEE 802.3az Energy Efficient Ethernet in all link speeds.
Technical Context
The VSC8501XML implements a voltage-mode line driver with on-die 50 Ω series termination resistors for direct Cat5 twisted-pair connection, eliminating external magnetics center-tap biasing and reducing EMI. Its PHY layer supports full auto-negotiation per IEEE 802.3-2008 Clause 28 and parallel detection for legacy links.
Synchronous Ethernet operation is enabled via RCVRDCLK2 output with programmable clock squelch control (disabled during auto-negotiation/no-link), meeting ITU-T G.8261/Y.1361 timing accuracy requirements. Ring Resiliency™ allows seamless 1000BASE-T master/slave timing reference switching without link drop.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standard Compliance | IEEE 802.3ab (1000BASE-T), 802.3u (100BASE-TX), 802.3i (10BASE-T), 802.3az (EEE), 802.3bf |
| Data Rate Support | 10/100/1000 Mbps full-duplex over Cat5 UTP; no speed negotiation delay |
| MAC Interface | RGMII v1.3 & v2.0 (2.5V/3.3V), GMII, MII - enables direct connection to network processors without glue logic |
| Fast Link Failure | <1 ms typical detection time - exceeds IEEE 802.3 requirement (750 ms ±10 ms) for high-availability systems |
| Operating Temperature | –40 °C ambient to 125 °C junction - qualified for extended industrial and outdoor telecom environments |
| Power Management | EcoEthernet™ v2.0 with ActiPHY™, PerfectReach™, and clause 45 EEE registers - reduces dynamic power by link state and cable reach |
| Clock Output | RCVRDCLK2 with programmable squelch - provides SyncE-compliant recovered clock with timing loop prevention |
Pinout & Package
Package: 135-pin plastic multi-row QFN, 12 mm × 12 mm body, 0.65 mm pitch, exposed thermal pad (VSS_CASE).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P0_D0P/P0_D0N to P0_D3P/P0_D3N |
Copper PHY differential pairs | Four ADIFF channels for full-duplex 1000BASE-T signaling; integrated 50 Ω termination eliminates external resistors |
| RCVRDCLK2/PHYADD2 | Recovered clock output / PHY address bit 2 | Configurable as SyncE clock source or SMI address input; active only when NRESET is deasserted |
| CLK_SQUELCH_IN | Clock squelch control | Pull-down input that disables RCVRDCLK2 during auto-negotiation or no-link states to prevent timing loops |
| NRESET | Active-low reset | Asynchronous global reset; powers down device and clears all registers to default state |
| MDC/MDIO | Serial Management Interface | IEEE 802.3 clause 22/45 compliant SMI bus; supports up to 32 PHYs on shared MDIO bus with PHYADD[4:0] |
| GTX_CLK_0/TXC_0 | Transmit clock input | Accepts 25 MHz (100BASE-TX), 125 MHz (1000BASE-T), or 2.5 MHz (10BASE-T) for RGMII/GMII timing alignment |
Key Features
| Feature | Design Value |
|---|---|
| Integrated line-side termination | On-die 50 Ω resistors eliminate 8 external components and reduce PCB area by >15 mm² per port |
| RGMII timing compensation | Internal delay matching removes need for board-level trace-length tuning or external delay lines |
| VeriPHY® cable diagnostics | Locates opens, shorts, and impedance mismatches up to 120 m on Cat5 cables without external test equipment |
| Wake-on-LAN with SecureOn | Hardware-accelerated magic packet detection with configurable password protection prevents unauthorized wake events |
| Ring Resiliency™ | Zero-downtime 1000BASE-T timing reference switch between master/slave modes maintains PTP/SyncE lock |
Applications
| Industrial Ethernet Switches | Telecom Access Nodes |
|---|---|
Use Scenario: Compact Layer 2 switches deployed in factory automation cabinets with strict thermal and space constraints. IC Role / Device Role / Timing Role: Copper PHY transceiver providing 1000BASE-T uplink/downlink with Synchronous Ethernet clock recovery for deterministic motion control networks. Use Value: Integrated termination and RGMII compensation reduce BOM count by 12 components; –40°C to 125°C rating ensures reliability in uncontrolled enclosures. |
Use Scenario: DSLAM or GPON OLT front-panel Ethernet interfaces requiring carrier-grade availability and precise timing. IC Role / Device Role / Timing Role: SyncE-compliant PHY delivering recovered clock (RCVRDCLK2) with squelch control to meet ITU-T G.8262 wander specifications. Use Value: Fast link failure (<1 ms) enables sub-50 ms network failover; Ring Resiliency™ supports metro ring topologies without service interruption. |
| Network Attached Storage (NAS) | Smart Grid RTUs |
Use Scenario: High-density NAS appliances using RGMII to connect multiple PHYs to a single SoC-based storage controller. IC Role / Device Role / Timing Role: Low-power 10/100/1000BASE-T PHY with EcoEthernet™ v2.0 enabling dynamic power scaling based on traffic load and cable length. Use Value: Clause 45 EEE registers allow fine-grained power state control; Jumbo frame support (16 KB) improves large-file transfer efficiency. |
Use Scenario: Remote terminal units in substations requiring hardened Ethernet connectivity across wide ambient temperature swings. IC Role / Device Role / Timing Role: Industrial-grade PHY with –40°C to 125°C junction rating and HP Auto-MDIX for field-deployed flexibility. Use Value: VeriPHY® diagnostics enable remote cable health monitoring; Wake-on-LAN with SecureOn allows secure firmware updates over Ethernet. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Ethernet PHY applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Marvell Alaska 88E1512 | 112-pin QFN, supports SGMII/RGMII but lacks native SyncE clock squelch and Ring Resiliency™ | Requires external clock conditioning circuitry for SyncE; no master/slave timing handoff capability | Preferred where SGMII backplane interface is required and SyncE timing loop prevention is handled externally |
| Realtek RTL8211F | 64-pin QFN, supports RGMII/GMII but no EcoEthernet™ v2.0, VeriPHY®, or fast link failure indication | Limited to commercial temperature range (0°C to 70°C); no integrated cable diagnostics or <1 ms fault detection | Suitable for cost-sensitive consumer gateways where industrial reliability and advanced diagnostics are not required |
Compared with VSC8501XML, the 88E1512 offers SGMII flexibility at the expense of SyncE robustness, while the RTL8211F reduces footprint and cost but omits critical industrial features like wide-temperature operation, VeriPHY®, and fast link failure - making VSC8501XML the only option meeting full telecom-grade timing and availability requirements.
Availability
VSC8501XML is available at Aetrix Electronics and suitable for industrial Ethernet switches, telecom access nodes, network attached storage, and smart grid RTUs requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for VSC8501XML 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
Microchip Technology is a global semiconductor company specializing in microcontrollers, analog devices, FPGAs, and connectivity solutions, with a focus on reliability, security, and longevity for industrial and automotive markets.
The VSC8501XML belongs to Microchip's VSC85xx family of precision Ethernet PHYs designed for carrier-class synchronization, low-latency networking, and energy-efficient infrastructure equipment operating under harsh environmental conditions.
FAQ
What is the primary function of the VSC8501XML in an Ethernet system?
The VSC8501XML serves as a single-port 10/100/1000BASE-T physical layer transceiver that bridges MAC-layer logic to copper twisted-pair media. It performs signal encoding/decoding, auto-negotiation, clock recovery, and EMI-optimized line driving. The VSC8501XML integrates termination resistors and RGMII timing compensation to simplify board design while maintaining full IEEE 802.3 compliance across all three speeds.
Does the VSC8501XML support Synchronous Ethernet, and how is it implemented?
Yes, the VSC8501XML supports Synchronous Ethernet via its RCVRDCLK2 output pin, which delivers a recovered clock aligned to the incoming Ethernet stream. This output meets ITU-T G.8261/Y.1361 jitter and wander specifications. Programmable clock squelch control (via CLK_SQUELCH_IN) disables the output during auto-negotiation or no-link states to prevent timing loops - a critical feature for SyncE network stability.
What power-saving features does the VSC8501XML provide beyond standard IEEE 802.3az Energy Efficient Ethernet?
Beyond baseline 802.3az EEE, the VSC8501XML implements EcoEthernet™ v2.0 with ActiPHY™ (dynamic power scaling per link state), PerfectReach™ (adaptive power reduction based on cable length), and clause 45 registers for granular EEE control. It also supports Wake-on-LAN with SecureOn password protection and full COMA_MODE deep-sleep mode - enabling sub-100 mW idle power in optimized configurations.
How does the VSC8501XML handle fast link failure detection, and why is it important?
The VSC8501XML detects link loss in less than 1 ms typical - significantly faster than the IEEE 802.3 requirement of 750 ms ±10 ms. This capability is implemented in hardware and reported via the FASTLINK_FAIL pin (A4). For VSC8501XML-based systems, this enables sub-50 ms network failover in high-availability rings or redundant uplinks, directly supporting carrier-grade SLA commitments and minimizing downtime in mission-critical infrastructure.
What are the key differences between the VSC8501XML and the base VSC8501 part number?
The VSC8501XML is the industrial-grade variant of the VSC8501 family, specified for –40°C to 125°C junction temperature operation, whereas the standard VSC8501 is rated for 0°C to 125°C junction. Both share identical functionality, pinout, and package (135-pin QFN), but the VSC8501XML undergoes extended temperature screening and qualification per AEC-Q100 stress tests - making it suitable for outdoor telecom, transportation, and industrial control applications where ambient extremes are expected.
VSC8501XML Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- -
- Packaging:
- Tray
- Product Status:
- Active
- Function:
- Ethernet
- Interface:
- Ethernet
- Number of Circuits:
- 1
- Voltage - Supply:
- 3.3V
- Current - Supply:
- -
- Power (Watts):
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 135-QFN (12x12)
VSC8501XML FAQ
1.How can I place an order for VSC8501XML through Aetrix?
Please submit a Request for Quotation (RFQ) for VSC8501XML 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 VSC8501XML reliable?
The price and inventory of VSC8501XML are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for VSC8501XML is usually 5 days.
3.What payment methods are accepted for VSC8501XML?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for VSC8501XML transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for VSC8501XML?
VSC8501XML orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your VSC8501XML 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 VSC8501XML?
For technical support, including VSC8501XML datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your VSC8501XML requirements.
6.How does Aetrix verify that VSC8501XML is sourced from the original manufacturer or authorized distributors?
All VSC8501XML 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 VSC8501XML meets industry standards.
7.What is the process for return or replacement of VSC8501XML?
All VSC8501XML units undergo pre-shipment inspection (PSI). If there is an issue with VSC8501XML, 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 VSC8501XML part is unused and in its original packaging.
Return procedure for VSC8501XML:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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