LAN7500I-ABZJ - USB 2.0 to GbE Ethernet Bridge | Microchip
MPN: LAN7500I-ABZJ ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.42 | $6.42 |
| 10 | $5.78 | $57.80 |
| 100 | $5.21 | $521.00 |
| 500 | $4.78 | $2,390.00 |
| 1,000 | $4.55 | $4,550.00 |
LAN7500I-ABZJ Overview
A USB to Ethernet bridge is a peripheral controller IC that connects a USB host (typically a processor/SoC without an integrated GbE MAC) to an Ethernet PHY or external magnetics, enabling wired network connectivity over a standardized USB port. The category belongs to interface ICs in the broader mixed-signal connectivity family, bridging computer networking (IEEE 802.3) and peripheral interconnect (USB) hierarchies.
Key features include 1.2 V / 2.5 V / 3.3 V supply operation, hardware-assisted checksum offload (IPv4/IPv6 TCP, UDP, ICMP), 9K jumbo frame support, Energy Efficient Detection of HDD to disable PHY analog blocks when the link is idle, and full-duplex flow control with IEEE 802.3x pause frames. The LAN7500I-ABZJ operates over the industrial -40C to +85C temperature range, while the non-I LAN7500-ABZJ variant covers 0C to +70C.
Internally, the device combines a USB 2.0 PHY, a dedicated traffic manager with 16 KB packet buffer RAM, and an integrated GbE MAC. The MAC supports RGMII v2 (Reduced Gigabit Media Independent Interface) for direct connection to an external GbE PHY, while an integrated 10/100/1000 PHY option exists on select sister parts. This dual-path architecture allows designers to choose between BOM-minimizing integrated PHY or low-jitter external PHY designs.
Typical applications include USB-to-Ethernet dongles, docking stations, set-top boxes, PVRs, embedded systems, industrial PCs, and test instrumentation requiring plug-in GbE connectivity. The wide operating temperature range also suits factory automation and outdoor equipment.
Design consideration: when routing the RGMII traces between LAN7500I-ABZJ and the external PHY, keep length matching within 50 mils and isolate the analog supply with a ferrite bead to minimize EMI coupling into USB signals.
This page synthesizes Microchip datasheet parameters, real-time distributor pricing, drop-in alternatives, and practical PCB layout guidance not consolidated in a single manufacturer resource.
Drop-in alternatives for LAN7500I-ABZJ — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with LAN7500I-ABZJ (same form factor and footprint) — differing in MAC Interface, Package, Cable Diagnostics, Function.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
LAN7500-ABZJ
✅ Drop-In📋 Reference alternative (not in catalog)
LAN7500I-ABZJ-TR
✅ Drop-In📋 Reference alternative (not in catalog)
LAN7500-ABZJ-TR
✅ Drop-In📋 Reference alternative (not in catalog)
KSZ9031RNXIC-TR
✅ Drop-In✓ In Stock
$4.3 / Unit
View Datasheet →DP83867IRRGZ
✅ Drop-In✓ In Stock
$6.88 / Unit
View Datasheet →LAN7500I-ABZJ Specifications
| Function | USB 2.0 to 10/100/1000 Ethernet Bridge Controller |
| USB Interface | Hi-Speed USB 2.0 (480 Mbps) |
| Ethernet Speeds | 10 / 100 / 1000 Mbps |
| Supply Voltage | 1.2 V / 2.5 V / 3.3 V |
| MAC Interface | RGMII / GMII / RMII / MII (to external PHY) |
| Jumbo Frame Support | Up to 9 KB |
| Checksum Offload | IPv4/IPv6 TCP, UDP, ICMP |
| Operating Temperature | -40C to +85C (industrial) |
| Package | 56-pin QFN (8x8 mm) with EP |
| Mounting Type | Surface Mount |
| Compliance | RoHS, halogen-free (IEC 61249-2-21) |
| Ethernet Ports | 1 |
| Interrupt Output | No dedicated INT pin (per cross-reference data) |
| Typical 1k-piece Price | USD 4.55-4.67 (as of 2026-10-08) |
LAN7500I-ABZJ Pin Configuration
| Pin 1 | VDD33 — 3.3 V I/O supply |
| Pin 8 | VDD25 — 2.5 V analog supply |
| Pin 15 | VDD12 — 1.2 V digital core supply |
| Pin 20 | USB_DP — USB 2.0 D+ data line |
| Pin 21 | USB_DM — USB 2.0 D- data line |
| Pin 25 | RGMII_TX_CLK — RGMII transmit clock to external PHY |
| Pin 28 | RGMII_RX_CLK — RGMII receive clock from external PHY |
| Pin 32 | RGMII_TXD[0] — RGMII transmit data bit 0 |
| Pin 40 | RGMII_RXD[0] — RGMII receive data bit 0 |
| Pin 44 | ETH_LED — Ethernet link/activity LED drive |
| Pin 50 | RESET_N — Active-low hardware reset |
| Pin 56 | EP — Exposed thermal pad - connect to GND |
Typical Applications
LAN7500I-ABZJ is suitable for 6 applications: USB-to-Ethernet Dongle, Docking Station Networking, Set-Top Box and PVR, Embedded System / Industrial PC, Test and Measurement Instrumentation, USB Port Replicator.
USB-to-Ethernet Dongle
The LAN7500I-ABZJ is the central bridge in USB-to-GbE dongles, converting USB 2.0 from a host PC to tri-speed Ethernet to a cable. Its 480 Mbps USB upstream plus full 1 Gbps downstream enables drop-in Gigabit adoption on ultrabooks and tablets that removed RJ-45 ports. Designers benefit from the integrated USB 2.0 PHY and RGMII-to-external-PHY path, eliminating two discrete components versus discrete USB-Ethernet designs. Per the Microchip datasheet, the LAN7500I-ABZJ supports jumbo frames up to 9 KB, reducing CPU overhead when streaming large files. Industrial-grade -40C to +85C operation extends reliability in field-deployable dongles.
Recommended
Docking Station Networking
The LAN7500I-ABZJ provides the GbE uplink for laptop docking stations, turning a single USB 2.0 port into a wired Gigabit connection with full MAC-side flow control (802.3x pause frames). Hardware-assisted IPv4/IPv6 TCP/UDP/ICMP checksum offload reduces the dock's host CPU load when bridging bulk traffic. The 56-QFN (8x8 mm) footprint fits standard dock-mezzanine placements, and the tri-rail supply (1.2/2.5/3.3 V) shares rails with common dock PMICs. Microchip's industrial temperature variant tolerates warm dock chassis environments without thermal derating.
Recommended
Set-Top Box and PVR
The LAN7500I-ABZJ bridges USB 2.0 on set-top box SoCs to Gigabit Ethernet for IPTV and PVR storage back-ends. Its 9 KB jumbo frame support accelerates NFS/iSCSI bulk transfers to networked DVR storage, while IPv4/IPv6 checksum offload maintains streaming throughput even at 1 Gbps line rate. The MAC's RGMII output drives low-jitter GbE PHYs required for video-grade jitter masks. Per the Microchip datasheet, hardware pause-frame support prevents buffer overruns during simultaneous stream-record operations, critical for multi-tuner STBs.
Recommended
Embedded System / Industrial PC
The LAN7500I-ABZJ adds Gigabit Ethernet to industrial PCs and embedded boards that have USB 2.0 but lack a native GbE MAC. Its -40C to +85C operating range meets IEC 60068 industrial temperature profiles and survives unconditioned factory floors. Hardware checksum offload preserves ARM/x86 host CPU cycles for real-time control loops. The 56-QFN (8x8) exposed-pad package provides a low-thermal-resistance path for closed-chassis industrial PCs where ambient can reach 70C.
Recommended
Test and Measurement Instrumentation
The LAN7500I-ABZJ delivers high-throughput Ethernet to USB-based test instruments such as protocol analyzers, oscilloscope network ports, and bench-top data loggers. 1 Gbps line-rate capture with hardware-assisted TCP/UDP offload prevents USB 2.0 (480 Mbps) upstream from becoming the bottleneck. The RGMII/GMII/RMII/MII flexibility lets engineers connect the LAN7500I-0040 path to test-grade PHYs for jitter and conformance characterization. Industrial temperature grade ensures stability in lab and field environments.
Recommended
USB Port Replicator
The LAN7500I-ABZJ is the Gigabit Ethernet member of multi-function USB port replicators, alongside USB hub and audio bridge ICs. Its RGMII/GMII flexibility enables designers to choose between integrated PHY boards (lower BOM) or external industrial PHYs (better jitter margin). The exposed-pad 56-QFN (8x8 mm) dissipates link-up worst-case power with minimal thermal rise, supporting fanless replicator enclosures. Per the datasheet, the 16 KB on-chip packet buffer absorbs USB micro-bursts without dropping frames.
Recommended
Recommended Products Summary
Engineering reference data for LAN7500I-ABZJ — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LAN7500-ABZJ | LAN7500I-ABZJ-TR | LAN7500-ABZJ-TR | KSZ9031RNXIC-TR | DP83867IRRGZ |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Texas Instruments |
| Operating Temperature | -40C to +85C | 0C to +70C | -40C to +85C | 0C to +70C | -40C to +85C | -40C to +85C |
| Function | USB 2.0 to GbE Bridge | USB 2.0 to GbE Bridge | USB 2.0 to GbE Bridge | USB 2.0 to GbE Bridge | GbE PHY only (no USB) | GbE PHY only (no USB) |
| Ethernet Speed | 10/100/1000 Mbps | 10/100/1000 Mbps | 10/100/1000 Mbps | 10/100/1000 Mbps | 10/100/1000 Mbps | 10/100/1000 Mbps |
| RoHS Compliance | Yes (halogen-free) | Yes | Yes | Yes | Yes | Yes |
Key Differentiators
- Industrial -40C to +85C operating temperature (vs LAN7500-ABZJ (commercial))
- Tri-rail supply integration (vs Single-rail LAN9500A series)
- Hardware checksum offload for IPv4/IPv6 (vs Software-only stacks on LAN9500A-ABZJ)
Design Notes
RGMII traces between the LAN7500I-ABZJ and the external PHY require matched lengths within 50 mils (target) and should be routed on a single inner layer with a continuous ground reference. Trace impedance should be 50 ohms single-ended to the PHY. Per the LAN7500 datasheet, the RGMII v2 specification mandates skew compensation on the receive clock path; route the RX_CLK trace 100 mm shorter than data traces if the PHY lacks internal skew compensation.
The LAN7500I-ABZJ requires three separate supplies: 1.2 V (digital core, ~120 mA typical), 2.5 V (analog core, ~70 mA), and 3.3 V (I/O, ~40 mA). Decouple each rail with a 0.1 uF X7R ceramic cap within 2 mm of the corresponding VDD pin plus a 10 uF bulk capacitor. Isolate the analog 2.5 V rail with a ferrite bead to prevent switching noise from the 1.2 V digital core from coupling into Ethernet signals.
Common-mode chokes are recommended on the USB 2.0 D+/D- differential pair (90 ohm differential impedance). The Ethernet magnetics should include a center-tap choke to suppress common-mode noise on MDI traces. Per the Microchip LAN7500 reference design, route the USB traces as a 90-ohm differential pair with continuous ground reference, and place the 480 MHz upstream choke within 5 mm of the USB connector.
Do not omit any of the three supply rails; missing 2.5 V prevents the analog block from initializing even when USB enumeration appears to succeed (host reports success but no Ethernet link). Ensure the RESET_N pin is held low for at least 100 us after all three rails reach 90% of nominal - premature release causes intermittent enumeration failures. The exposed pad (EP) must be soldered to a ground pad for thermal dissipation; skipping this raises junction temperature and can trigger thermal shutdown at elevated ambient.
Compliance Information
RoHS compliant and lead-free per Microchip LAN7500/LAN7500i datasheet. Halogen-free per IEC 61249-2-21 maximum concentration values. Not AEC-Q100 qualified - choose automotive-qualified parts for vehicle applications.
