# Ethernet Adapter Lenovo ThinkPad USB 3.0 1000 Mbit/s

**URL:** https://aio.lv/en/product--lenovo-4x90e51405--30397
**Data updated:** 2025-12-28 21:03 (EET)
**Category:** Cable Adapters & Converters
**Manufacturer:** Lenovo
**Manufacturer code:** 4X90E51405
**EAN:** 888228041933
**Warranty:** 1 Year
**Availability:** Available for order
**Price:** 26.49 €
**Prices and availability valid until:** 2026-07-20 23:59
**Price without VAT (21%):** 21.89 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--lenovo-4x90e51405--30397

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 15.07.2026 | free |
| Pickup points | 20.07.2026 | 1.89 EUR |
| Courier delivery to door | 20.07.2026 | 4.99 EUR |

## Summary description

The Lenovo ThinkPad USB 3.0 Ethernet Adapter provides a reliable wired connection with a maximum data transfer rate of 1000 Mbit/s. It features a USB interface for easy connectivity and an RJ-45 host interface for network access. The sleek black design ensures it fits seamlessly with your devices, making it an essential accessory for stable internet connectivity.

## Long description

The Lenovo ThinkPad USB 3.0 Ethernet Adapter (4X90E51405) is a compact wired network dongle that provides a full‑size RJ‑45 port via a USB connection. Designed for systems without a built‑in Ethernet jack, the adapter delivers up to 1000 Mbit/s over USB 3.0 and falls back to 100/10 Mbit/s on USB 2.0. The black, lightweight adapter supports booting from LAN on selected ThinkPad systems and includes activity and power LEDs on the RJ‑45 connector for connection status.
Advantages
The adapter offers Gigabit Ethernet performance when connected to a USB 3.0 port and automatic speed adaptation on USB 2.0. It uses a full‑size RJ‑45 connector with two LEDs (green for power, yellow for activity) to indicate link and transfer status. The device supports full duplex flow control (IEEE 802.3x) and conforms to IEEE 802.3, IEEE 802.3u and IEEE 802.3az standards. It is small and lightweight for easy transport and fits in briefcases or laptop bags.
Suitable for
Ultrabooks and tablets without an RJ‑45 port
Office or hotel environments requiring a stable wired connection
ThinkPad systems that require PXE/boot from LAN support
Users who need a simple plug‑and‑play wired networking solution
Key specifications
Manufacturer part number (MPN): 4X90E51405
Maximum data transfer rate: 1000 Mbit/s (USB 3.0); 100/10 Mbit/s (USB 2.0)
Interface: USB (host) — Host interface: RJ‑45
Networking standards: IEEE 802.3, IEEE 802.3u, IEEE 802.3x, IEEE 802.3az
Full duplex flow control (IEEE 802.3x)
Power over Ethernet (PoE): not supported
Colour: Black — Weight: 0.045 kg
How to use
Plug the Lenovo ThinkPad USB 3.0 Ethernet Adapter into an available USB port on your laptop, tablet or Ultrabook. Connect a network cable to the full‑size RJ‑45 connector. On systems with USB 3.0 the adapter negotiates Gigabit speeds automatically; on USB 2.0 ports it will operate at 100/10 Mbit/s. For selected ThinkPad models that support network booting, enable LAN/PXE boot in BIOS/UEFI if you need to boot from a remote server.
Usage recommendations
Use a USB 3.0 port and a Cat5e or better Ethernet cable to achieve Gigabit speeds. Avoid relying on the adapter for power delivery—PoE is not supported. Check BIOS/UEFI settings on compatible ThinkPad systems to enable boot from LAN when required.

## Specifications

| Feature | Value |
|---|---|
| Internal | No |
| Cabling technology | 10/100/1000BaseT(X) |
| Maximum data transfer rate | 1000 Mbit/s |
| Ethernet LAN | Yes |
| Connectivity technology | Wired |
| Ethernet LAN (RJ-45) ports | 1 |
| USB ports quantity | 1 |

### Logistics data

| Feature | Value |
|---|---|
| Harmonized System (HS) code | 85176990 |

### Operational conditions

| Feature | Value |
|---|---|
| Operating temperature (T-T) | 0 - 70 |

### Certificates

| Feature | Value |
|---|---|
| Certification | VCCI, CB, Ukraine CoC, ACA/C-Tick, CE MARK, ICES, KC (Korea), EAC, FCC, BSMI |

### Other features

| Feature | Value |
|---|---|
| Interface | USB |
| Networking standards | IEEE 802.3x, IEEE 802.3u, IEEE 802.3az, IEEE 802.3 |
| Ethernet LAN data rates | 1000, 100, 10 |

### Technical details

| Feature | Value |
|---|---|
| Host interface | RJ-45 |

### Features

| Feature | Value |
|---|---|
| Plug and Play | Yes |
| Product colour | Black |

### Weight & dimensions

| Feature | Value |
|---|---|
| Weight | 0.045 kg |
| Height | 16 mm |
| Width | 100 mm |
| Depth | 280 mm |

## FAQ

### How much does the Ethernet Adapter Lenovo ThinkPad USB 3.0 cost, and is it available for purchase?

The price is 26.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 146 pcs. are in stock, and you can place your purchase right now with delivery across Latvia and Europe or choose pickup at the Riga collection point. We offer favorable purchase terms, including the option to split the payment into convenient monthly installments. Availability and price are updated in real time, so we recommend placing your order in advance.

### If I order this product today, when will I receive my order?

If you place your order today, delivery will be as fast and convenient as possible. You will be able to pick up your order on 15.07.2026 at the Riga pickup point or choose delivery across Latvia and Europe. We carefully inspect every purchase and pack it securely for safe transportation.

### What payment options are available?

AiO.lv offers several payment methods: Cash payment, Bank transfer, Bank cards on-line, Apple Pay, Google Pay. All transactions are 100% secure and encrypted.

### Can this product be purchased for a company (with VAT)?

Yes. AiO.lv works with legal entities in Latvia and across Europe. The product price already includes VAT. For certain product categories, as well as for companies from other EU countries with a valid VAT number, a 0% VAT rate may apply. We issue the invoice immediately after the order is placed, support electronic BIS invoices, and automatically generate all necessary accounting documents. You can complete the purchase for a company online — simply select the company profile and choose bank transfer as the payment method during checkout.

### What is the warranty period?

All Lenovo products come with an official 2 Years warranty. It covers all manufacturing defects and malfunctions that may occur during use. The warranty is valid at all authorized Lenovo service centers and through AiO.lv

### Can the product be returned after purchase?

Yes, you can return the product within 14 days of purchase if you bought it as a consumer (not a legal entity). Returns are possible without giving any reason — the main condition is that the product retains its original appearance and full set of accessories. We will make the process as simple and convenient as possible: just contact our customer support team, and we will help you arrange the return.

### Where should I contact for warranty service?

For warranty-related questions you can contact the AiO.lv (SIA VSPRO) customer support team. More information about warranty service: https://aio.lv/en/warranty

### How can I tell if this product suits my needs?

When making a choice, we recommend paying attention to the key features: weight, product colour, compatibility with your devices or usage conditions, material quality, functionality, and warranty terms. These characteristics will help you determine how well the model meets your needs.

## Image

https://aio.lv/img/cache/product/30397/54713739_large.webp