Lenovo ThinkPad Thunderbolt 3 Dock Gen 2 Review
Tired of your desk looking like a cable jungle gym? Read our Lenovo ThinkPad Thunderbolt Dock review—a sleek solution to your cluttered tech life, akin to magic.
Genuine Lenovo dock with a 3-year worldwide warranty and Lenovo factory support. The ThinkPad Thunderbolt 3 Dock Gen 2 (40AN0135US) connects through Thunderbolt 3 at 40 Gbps, delivers 135W through a Lenovo adapter, and provides thirteen ports including four video outputs (dual HDMI, dual DisplayPort), five USB-A 3.1 Gen 2, one USB-C, Gigabit Ethernet, and audio. This is Lenovo’s TB3 desk dock for ThinkPad laptops — one generation below the current ThinkPad Universal Thunderbolt 4 Dock but still supported with a 3-year warranty that covers worldwide service. For ThinkPad owners who need Thunderbolt bandwidth without upgrading to TB4, the Gen 2 dock provides it from Lenovo with Lenovo’s name on the warranty card.
Thirteen ports. 135W Lenovo adapter, power cord, Thunderbolt 3 cable, and documentation in the box. This particular listing includes third-party accessories (SSD starter kit and HDMI cables) alongside the Lenovo dock. The dock and adapter are Lenovo. The extras are not.
Key Specifications
| Specification | Detail |
|---|---|
| Total Ports | 13 |
| HDMI | 2 |
| DisplayPort | 2 |
| USB-A 3.1 Gen 2 | 4 (10 Gbps) |
| USB-A 3.1 Gen 2 Always-On | 1 (10 Gbps, charges devices when laptop sleeps) |
| USB-C 3.1 Gen 2 | 1 (10 Gbps) |
| Thunderbolt 3 Host | 1 (40 Gbps, connects to laptop) |
| Thunderbolt 3 Accessory | 1 (daisy-chain or TB3 device) |
| Gigabit Ethernet | 1 (10/100/1000 Mbps) |
| 3.5mm Audio | 1 (headphone/mic combo) |
| Security Lock | 1 |
| Power Adapter | 135W Lenovo included |
| Host Cable | Thunderbolt 3 included |
| Compatible Devices | Lenovo notebooks/tablet PC |
| Compatible OS | Windows 7, Windows 10 |
| Weight | 1143g / 2.52 lbs |
| Dimensions | 9.7″ L x 6.5″ W x 1.1″ H |
| Manufacturer | Lenovo |
| Warranty | 3 years worldwide |
Lenovo ThinkPad Thunderbolt 3 Dock Gen 2 135W (40AN0135) Dual UHD 4K Display Capability, 2 HDMI, 2 DP, USB-C, USB 3.1 with 3 Years Warranty Card
Four Video Outputs: Dual HDMI and Dual DisplayPort
Two HDMI and two DisplayPort provide four video output ports. Thunderbolt 3 bandwidth at 40 Gbps supports up to three UHD displays simultaneously. The four ports offer flexibility in how you connect — two monitors via HDMI, two via DP, or a mix. The additional Thunderbolt 3 accessory port can daisy-chain a Thunderbolt display or connect a Thunderbolt storage device while the other video ports drive monitors.
For a desk setup with two 4K monitors and a third at lower resolution, the dock provides enough video paths to configure that without adapters. All four ports are available — connect to whichever inputs your monitors have.
Five USB-A at 10 Gbps Plus Always-On
Five USB-A 3.1 Gen 2 ports all running at 10 Gbps. One of those five includes Always-On charging, which means it powers phones and devices even when the laptop is in sleep mode, hibernation, or powered off (as long as the dock receives power from the adapter). For a phone that charges overnight on the desk, the Always-On port keeps it powered without the laptop running. The remaining four 10 Gbps ports handle external SSDs, webcams, and peripherals at full Gen 2 speed.
One USB-C 3.1 Gen 2 at 10 Gbps rounds out the USB connectivity. Six high-speed USB ports total is among the highest counts in the ThinkPad dock lineup.
135W Lenovo Adapter: Full-Speed Charging
The included 135W Lenovo adapter powers the dock and charges the laptop through Thunderbolt 3. 135W covers every ThinkPad on the compatible list at full charging speed. ThinkPad E-series (45-65W), T-series (65W), X1 Carbon (65W), X1 Extreme (135W) — all charge at full speed. The adapter is the same genuine Lenovo unit that ships with the X1 Extreme. No third-party charger. No reduced wattage.
3-Year Worldwide Warranty
Three years of worldwide warranty with Lenovo factory support. That is longer than most third-party docks (typically 1-2 years) and covers service in any country. For IT departments that deploy docks across international offices, worldwide coverage means a dock purchased in one country receives warranty service in another. Lenovo’s warranty outlasts the typical ThinkPad dock lifespan by aligning with the laptop’s own 3-year business warranty cycle.
What Lenovo Includes
The Lenovo box contains the docking station, 135W power adapter, power cord, Thunderbolt 3 cable, and documentation. Any additional accessories in this listing (SSD kit, HDMI cables) are third-party additions from the seller, not Lenovo items.
Where This Dock Fits in Lenovo’s Lineup
Lenovo’s ThinkPad dock hierarchy: the 7-in-1 USB-C travel hub (minimal, portable), the Travel Dock (dual 4K, compact), the ThinkPad USB-C Gen 2 Dock (hybrid USB-C/USB-A, 40AF0135US), the ThinkPad Thunderbolt 3 Dock Gen 2 (this unit, 40AN0135US, TB3 40 Gbps), the ThinkPad Universal Thunderbolt 4 Dock (TB4, vPro, HDMI 2.1), and the ThinkPad Thunderbolt 4 Workstation Dock (300W, P-series). This dock sits one tier below the TB4 Universal Dock. For the TB4 upgrade, see the Lenovo ThinkPad Universal Thunderbolt 4 Dock review.
Drawbacks
| Consideration | Detail |
|---|---|
| Thunderbolt 3, Not TB4 | TB4 provides guaranteed minimum specs that TB3 does not. |
| Lenovo ThinkPads Only | Compatible with Lenovo notebooks/tablet PC. Non-Lenovo not listed. |
| Windows 7/10 Only | Windows 11 and macOS not listed. |
| 2.52 lbs | Desk dock. Not portable. |
| Third-Party Extras in Listing | SSD kit and HDMI cables are not Lenovo items. |
| No Card Reader | No SD or MicroSD. |
Who This Dock Is For
ThinkPad owners who need a genuine Lenovo Thunderbolt 3 desk dock with a 3-year worldwide warranty, 135W charging, four video outputs, six 10 Gbps USB ports, Ethernet, and audio: The Gen 2 dock provides Thunderbolt 3 bandwidth with Lenovo factory support and a warranty that aligns with ThinkPad business lifecycle. Five USB-A at Gen 2 with Always-On charging. 135W adapter charges every compatible ThinkPad at full speed. For the current TB4 dock, see the ThinkPad Universal TB4 review.
Non-ThinkPad owners, macOS/Linux users, or buyers who need TB4: Compatible devices lists Lenovo notebooks only. macOS and Linux not listed. TB3, not TB4. For universal docks, see the docking stations hub page.
Final Verdict
The Lenovo ThinkPad Thunderbolt 3 Dock Gen 2 is a genuine Lenovo desk dock with a 3-year worldwide warranty — longer than any third-party dock in this category. Thirteen ports with four video outputs, six USB at 10 Gbps (one Always-On), Gigabit Ethernet, audio, and a security lock. The 135W Lenovo adapter charges every compatible ThinkPad at full speed through Thunderbolt 3 at 40 Gbps. The dock sits one tier below Lenovo’s current TB4 Universal Dock, which means it provides TB3 bandwidth at a lower price point for ThinkPads that do not have TB4. The 3-year warranty, Lenovo factory support, and genuine adapter make this a dock where the brand backing matters as much as the port count.
Frequently Asked Questions
Is this a genuine Lenovo dock?
Yes. Model 40AN0135US. Manufactured by Lenovo with a 3-year worldwide warranty and Lenovo factory support.
Does this work with non-Lenovo laptops?
The compatible devices field lists Lenovo notebooks and tablet PCs only. Non-Lenovo Thunderbolt 3 laptops may connect for basic functionality, but Lenovo-specific features will not work.
How does this compare to the ThinkPad Universal TB4 Dock?
The Gen 2 is Thunderbolt 3. The Universal is Thunderbolt 4 with HDMI 2.1 and vPro support. Both are Lenovo docks with Lenovo warranties. The TB4 dock is the current generation. The TB3 Gen 2 is the previous generation at a lower price.
What does Always-On USB mean?
One USB-A port charges devices even when the laptop is asleep, hibernating, or powered off. The dock must remain connected to the 135W adapter for Always-On to function.
Disclosure: As an Amazon Associate, I earn from qualifying purchases.
Docking Station Intelligence
The standards are confusing by design. These three panels decode what manufacturers won’t explain clearly. Applicable to every docking station.
The USB-C Confusion Matrix
The USB-C connector is the single greatest source of buyer confusion in docking stations. The physical plug looks identical whether it carries USB 2.0 at 480 Mbps or Thunderbolt 5 at 120 Gbps — a 250x difference in capability hidden behind the same shape. Manufacturers exploit this by labeling everything "USB-C compatible" without specifying which protocol runs through it. Two docks can look identical on the outside and behave completely differently once you plug them in.
The hierarchy matters because it determines everything: how many monitors your dock can drive, how fast files transfer, whether your laptop charges while docked, and whether you need third-party drivers. Here is the real capability ladder, from slowest to fastest:
The practical takeaway: if your laptop has Thunderbolt 4, buy a Thunderbolt dock. If it only has generic USB-C, verify whether it supports DisplayPort Alt Mode before buying anything with multi-monitor claims. Our buying guide walks through verification steps for every major laptop brand.
Power Delivery: What the Watts Mean
Power Delivery (PD) determines whether your docking station can charge your laptop while you work, or whether you need a separate charger cluttering your desk. The math is simple but rarely explained: your laptop draws a specific wattage under load, and the dock must match or exceed it. If the dock delivers less than your laptop needs, the battery slowly drains even while plugged in — defeating the purpose of a docking station entirely.
Most ultrabooks need 45–65W. Standard business laptops need 65–100W. Gaming and workstation laptops can demand 100–140W or more. The dock’s advertised PD wattage is the maximum it can deliver to your laptop — but this drops if you charge other devices (phones, tablets) through the dock simultaneously. Always leave a 15–20W margin above your laptop’s requirement.
Check your laptop’s original charger wattage — that’s your baseline. Our FAQ covers how to find this for every major brand.
Native Display vs DisplayLink: The Hidden Factor
This is the decision most buyers don’t know they’re making. When a docking station outputs video to your monitors, it uses one of two fundamentally different methods: native (the dock passes your laptop’s GPU signal directly to the monitor) or DisplayLink (the dock compresses video over USB and a software driver renders it). The difference is invisible in marketing materials but profoundly affects your daily experience.
Native output through DisplayPort Alt Mode or Thunderbolt uses your laptop’s actual graphics hardware. There is zero added latency, full DRM support for streaming services, no CPU overhead, and no driver to install. DisplayLink, by contrast, adds 5–15ms of latency (noticeable in video calls and cursor movement), blocks DRM content on connected monitors (Netflix, Disney+ show black screens), consumes 3–8% of your CPU constantly, and requires a driver that Apple’s macOS security updates occasionally break.
DisplayLink exists for one reason: Apple Silicon base chips (M1, M2, M3) can only drive one external display natively. If you need two or more monitors on a base MacBook Air or 13” MacBook Pro, DisplayLink is your only option. For everyone else — Windows users, Mac Pro/Max chip users, Intel/AMD laptops — native is always the better choice.
Native (Alt Mode / Thunderbolt)
DisplayLink (USB compression)
The bottom line: if your laptop supports native multi-display output, always choose a native dock. DisplayLink is a workaround, not an upgrade. See our glossary for detailed definitions.
COMMAND CENTERCOMMAND CENTER
Six tools that decode the confusion manufacturers create. Port protocols, power budgets, display configurations, compatibility, desk planning, and future-proofing. Full buying guide →
Port Protocol DecoderWhat does your connection type actually support? Glossary
Power Delivery CalculatorCan this dock keep your laptop charged?
Display Configuration PlannerCan your dock push enough pixels?
Laptop-to-Dock CompatibilityWill this dock work with YOUR laptop?
Desk Setup ArchitectWhat ports do you actually need?
Select everything you need to connect: