Microchip Technology VSC7440XMT

Overview

VSC7440XMT from Microsemi (now Microchip) is a Layer 2/Layer 3 enterprise-grade Gigabit Ethernet switch IC with integrated 10 Gbps SerDes links, supporting up to 24x 1G/2.5G ports and 2x 10G uplinks. It delivers hardware-accelerated IPv4/IPv6 routing, IEEE 1588v2 Precision Time Protocol (PTP) with sub-100 ns time stamping accuracy, and full Synchronous Ethernet (SyncE) compliance for telecom and industrial timing-critical networks.

For engineers reviewing the VSC7440XMT datasheet, VSC7440XMT pinout, VSC7440XMT application, or VSC7440XMT equivalent, this page provides verified technical context, validated pinout mapping, confirmed timing and forwarding specifications, and real-world deployment guidance for carrier-grade access switches, industrial Ethernet controllers, and time-sensitive networking (TSN)-enabled infrastructure.

Technical Context

The VSC7440XMT implements a distributed packet processing architecture with dedicated VCAP (Versatile Content-Aware Processor) engines for classification, ACL enforcement, and QoS mapping - enabling line-rate L2/L3 forwarding at full wire speed across all ports. Its pipeline supports deep hierarchical scheduling, per-flow policing, and sFlow-based traffic monitoring with hardware timestamping aligned to PTP clock domains.

It integrates dual 10G SerDes lanes (SERDES10G), configurable 1G/2.5G copper transceivers with VeriPHY™ cable diagnostics and ActiPHY™ power management, and a GCPU interface for host control. The device supports IEEE 802.1Q, 802.1ad, VLAN-aware bridging, MSTP/RSTP, and IGMP/MLD snooping - all managed via register-level access or Microsemi's Vitesse Management Suite.

Key Specifications

Pinout & Package

The VSC7440XMT is housed in a 484-pin FC-BGA package (27 mm × 27 mm, 0.8 mm pitch) with thermal lid and exposed thermal pad. Pin assignment follows Microsemi's standard VSC74xx pinout layout, optimized for signal integrity in high-speed Ethernet backplanes.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar enterprise Ethernet switch applications.

Compared with the VSC7440XMT, the 88E1512 offers lower integration but simpler PHY-only use cases, while the X710-AT2 trades autonomous switching capability for host-managed flexibility - making the VSC7440XMT uniquely suited for headless, timing-precise, and fully embedded L2/L3 switching roles.

Availability

VSC7440XMT is available at Aetrix Electronics and suitable for industrial automation, smart grid infrastructure, and carrier access network deployments requiring stable component supply, long-term lifecycle support, and guaranteed obsolescence management.

Supply support for VSC7440XMT 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., specializes in high-reliability semiconductor solutions for aerospace, defense, communications, and industrial markets - with deep expertise in timing, security, and Ethernet infrastructure.

The VSC7440XMT belongs to Microsemi's VSC7400 family of enterprise-class Ethernet switches, engineered specifically for carrier-grade timing precision, deterministic forwarding, and secure edge networking in mission-critical infrastructure.

FAQ

What is the maximum number of concurrent VLANs supported by the VSC7440XMT?

The VSC7440XMT supports up to 4,094 IEEE 802.1Q VLANs and 64 private VLAN domains. Its VLAN-aware bridging engine handles ingress/egress tagging, translation, and filtering in hardware - enabling scalable segmentation for multi-tenant service provider networks without performance penalty. This capability is fully implemented in the VSC7440XMT silicon and verified in Revision 4.2 of the official datasheet.

Does the VSC7440XMT support IEEE 802.1Qbv time-aware shaping for TSN?

Yes, the VSC7440XMT implements IEEE 802.1Qbv-compliant time-aware shaper logic within its Shared Queue System and Hierarchical Scheduler. It supports cyclic queuing with configurable gate control lists (GCL), time-synchronized scheduling across ports, and hardware-enforced transmission windows - all essential for deterministic TSN traffic. This feature is documented in Section 3.24 of the VSC7440XMT datasheet.

Can the VSC7440XMT operate as a PTP transparent clock?

Yes, the VSC7440XMT supports both PTP boundary clock and transparent clock modes per IEEE 1588v2. In transparent mode, it measures residence time on each port and corrects PTP messages in hardware with nanosecond-level accuracy - critical for minimizing timing error accumulation in multi-hop networks. This behavior is enabled via register configuration in the VSC7440XMT's PTP subsystem.

What package type and thermal characteristics does the VSC7440XMT use?

The VSC7440XMT uses a 484-pin Fine-Pitch Ball Grid Array (FC-BGA) package measuring 27 mm × 27 mm with 0.8 mm ball pitch and an integrated thermal lid. Its junction-to-case thermal resistance is 0.35°C/W, and maximum operating junction temperature is 105°C - enabling reliable operation in fanless industrial enclosures. These mechanical and thermal specs are defined in the VSC7440XMT packaging documentation.

Is the VSC7440XMT compatible with Microchip's current design tools and software stack?

Yes, the VSC7440XMT is fully supported by Microchip's Vitesse Management Suite (VMS) v4.2+ and compatible with the latest versions of the VSC74xx SDK, including drivers, CLI utilities, and web-based configuration tools. Firmware updates, register-level debugging, and PTP calibration workflows are actively maintained for the VSC7440XMT under Microchip's product continuity program.