Is there a pin-compatible replacement for RTL8211E-VB-CG?

The RTL8211FSI-VS-CG is a potential pin-compatible replacement as it is from the same family and package, but this must be confirmed by comparing the datasheets' pinout diagrams. Cross-vendor alternatives are not pin-compatible.

What risks should I check before replacing RTL8211E-VB-CG?

When replacing RTL8211E-VB-CG, key risks include pinout mismatches, different power supply requirements (especially the target's integrated regulator), and the need for firmware/driver updates to support a new PHY chip.

RTL8211E-VB-CG Alternatives, Datasheet & Cross Reference | REALTEK

RTL8211E-VB-CG is a 1G Ethernet PHY in a 48-QFN package. While finding a direct drop-in replacement is challenging, several functional alternatives and potential upgrades exist from Realtek and other vendors.

AI replacement insight

Package risklow

Several alternatives exist in the same 48-QFN package.

Electrical riskhigh

Many alternatives lack the target's integrated regulator, requiring power supply redesign.

Firmware riskhigh

Cross-vendor PHYs require different drivers and register configurations.

Can it be replaced directly?

No verified direct drop-in replacement is available without engineering review. The RTL8211FSI-VS-CG is the most promising candidate for a near-compatible upgrade.

Best replacement path

Upgrade to the newer Realtek RTL8211FSI-VS-CG, pending pinout verification.

Main risk

The primary risk is the need for board redesign, either due to a different pinout or, more significantly, different power supply architecture in cross-vendor parts.

Recommended alternatives

A potential upgrade from the same manufacturer with a wider temperature range and more features.

View details

Alternative comparison matrix

Feature / factor	RTL8211E-VB-CG	RTL8211FSI-VS-CG	KSZ9131RNXC-TR	YT8531SH	Compatibility / risk
Package	48-QFN	48-Pin QFN	48-pin QFN	48-pin QFN (6x6 mm)	48-Pin QFN / 48-pin QFN / 48-pin QFN (6x6 mm) — Package matches.; KSZ9131RNXC-TR: Package matches.; YT8531SH: Package matches.
Interface	RGMII	RGMII, SGMII	-	-	RGMII, SGMII — Candidate is a superset, includes target's RGMII.
Temperature	0°C to 70°C	-40°C to 85°C	0°C to +70°C	-40°C to 85°C	-40°C to 85°C / 0°C to +70°C — Wider industrial temperature range.; KSZ9131RNXC-TR: Temperature range matches.; YT8531SH: Wider industrial temperature range.
Ptp Support	Not specified	Yes	-	-	Yes — Candidate adds PTP support, may require configuration.
Manufacturer	REALTEK	REALTEK	MICROCHIP	Motorcomm	REALTEK / MICROCHIP / Motorcomm — Same manufacturer, suggesting family compatibility.; KSZ9131RNXC-TR: Cross-vendor alternative.; YT8531SH: Cross-vendor alternative.
Power	Built-in Switching Regulator	-	Core/IO voltages specified	3.3 V, 1.1 V	Core/IO voltages specified / 3.3 V, 1.1 V — Requires external regulation; target has integrated regulator.; YT8531SH: Requires external 1.1V supply; target has integrated regulator.

Application & sourcing insights

Questions & answers

The best alternative is likely the RTL8211FSI-VS-CG from the same manufacturer, which offers an upgraded temperature range. However, pinout and register compatibility must be verified. For new designs, parts like Microchip's KSZ9131RNXC-TR are also viable but require board changes.