Instruction: Extract information from the supporting document to answer the given question.

Input:
Question: Is Lenovo 433835U TP MiniDock Plus Series 3 170W Docking Station compatible with Thinkpad T540p laptop ?
Document: The pros -  all the data, audio and video ports we could want. My goal was to use my W520 to replace the aging home wireless network desktop PC that runs two printers. The ThinkPad MiniDock Plus Series 3 (170w) docking station ought to be able to do the trick. The W520 fits into the docking station with no problem. The power brick is the same size as my W520 power brick, so no issues there.However, I am unable to power-on from the docking station.
Neither the power button on the docking station, nor the power button on my W520 keyboard will work. I must release the W520 from the docking station to power on, then place my W520 back into the docking station.The next problem is that the USB 3.0 port on the docking station will not function as USB 3.0 with my external HDD (a 3T "Seagate Desktop Plus" USB 3.0 device).
I must plug my HDD into the USB 3.0 port on the side of my laptop to get the proper USB 3.0 connection. I will be very unhappy if it's a true  rumor that the docking station's USB 3.0 will only work with Lenovo brand external drives.Are these flaws or operator error? I am just not technical enough to know, and was foolish to have assumed there would be a user's manual in the box or online. I have used the Displayport with no issues.
I have a ThinkPad 520W. It is powerful enough to replace my desktop. But the 15" screen is just not enough.With the MiniDock, i have been able to add two 24" external monitors along with the laptop display. I now have three work surfaces. I tend to keep a dozen windows open at once, so three screens is a great feature.
This dock works great for my Lenovo W530 ThinkPad. I love being able to dock/undock my laptop quickly rather than having to (dis)connect the network cable, monitor cable, power cord, USB peripherals, headphones, etc.
if you want to turn your think pad to a powerful desktop but still want mobility this is the product for you. its a solid product which comes with an extra 170W charger which is a plus. I really loved it
Hi AllThis is a docking station. Nothing glorious or glamorous - tho' the USB 3.0 port provides a near-out-of-body-experience!BUT:  When you have external speakers attached (using the Mini Dock's audio-out jack), you get an almighty "kah-lick" every time there is a change in the audio output (i.e. when it goes from quiet to a voice, or a song starts, or the volume is adjusted, or pretty mauch anything!
Laptop is not  balancing on the docking station.
If you're planning on using your compatible Lenovo laptop with multiple monitors, this is the dock for you. Note that your multiple monitor setup is limited to 1 VGA-type analog interface. You can have two DVI-D or DP connections from the dock, and according to Lenovo, you can mix and match deployments with those interfaces and the VGA port up to the monitor count limit set by your video card.
Great docking station. Adds capability to multiple monitors and has lots extra of USB ports. Also provides great security when locked down with a laptop lock
Answer: You don't need 170W for the T-series; they only require 90W.  The dock listed for the T540p is 40A20090US on the Lenovo website (find it under accessories for the T540p).  I'd get the one specifically listed for the T540p to be safe.