Teardown Tuesday: Amazon Echo Dot v2

November 01, 2016 by Mark Hughes

The Amazon Echo Dot v2 is out. Here's a look inside.

The Amazon Echo Dot version 2 is out. Here's a look inside.

The Echo is Amazon's smart speaker and voice-activated Wi-Fi-enabled system, activated by the name "Alexa". The Dot is a smaller version with the same functionality, released in March of 2016.

This October, an upgraded Dot was released with improved voice recognition and the ability to determine the proximity of someone issuing commands, allowing for better cooperation between multiple Dot or Echo units.

Let's crack one of these new versions open and see what it's made of.

Disassembling the Echo Dot

The Second Generation Amazon Echo Dot is held together with four M2.2 x 1.6mm thread-forming screws whose T8 heads are covered by the anti-slip mat at the base of the dot.  

Begin by carefully peeling back an edge the soft rubber-like mat to reveal the clear rigid vinyl base layer. Use a sharp tool to lift the clear rigid vinyl base away from the Echo Dot to reveal the four case screws. Remove the case screws and gently shake the case to release the circuit boards and other components. The speaker can be removed with one or two firm raps against a hard surface.


Overview of the parts and pieces that are inside the Echo Dot

The two circuit boards inside the Amazon Echo Dot v2


Unfortunately, many of the components in the Amazon Echo Dot are very small and do not contain manufacturer's identification markings—this makes positive identification difficult and time-consuming. But confirmation, once known, should be fast and easy.

I have supplied the information as it appears on the component. If you are familiar with these components and can provide a link to the manufacturer or distributor web page or datasheet, please comment below and we will update the table to include information that is not available at the time the article was written.

Circuit Board #1

Component Marking Description Cost More Information
M1735 ◦1932 M2 346 Microphone    
M1738 ◦6697 M2 346 Microphone    
ADC 3101 TI 681 AE4X Analog-to-digital converter $1.50 Website
  Light/color sensor    
R3019 3236 Microcontroller    
  RGB LED    

Top of Circuit Board #1

The top of the first circuit board has the following components:

  • Four tactile switches (red) that control volume, the microphone mute button (in white), and an action button
  • One microchip U3 that appears to be a light sensor or color sensor (orange)
  • Also visible are 6 equidistant perimeter holes and one central hole for microphones located on the opposite side of the circuit board


Image of front of topmost circuit board from inside the Amazon Echo Dot


Closeup image of the optical sensor highlighted next to a switch


This little green window is about the width of a grain of rice


Hyper closeup image of the sensor


Bottom of Circuit Board #1

The bottom side of the topmost circuit board has:

  • Two variations of surface-mount microphones (red)
  • Twelve RGB LEDs (yellow) that are used to indicate volume, action, and microphone off
  • Four two-channel analog-to-digital converters (orange) that convert the microphone outputs to digital signals
  • A microcontroller (blue) that connects the switches and the LEDs
  • A ribbon cable connector that leads to the bottom circuit board


​​Amazon Echo Dot Circuit Board 1

Circuit Board #2

Component Marking Description Cost More Information
DAC 32031 TI 68k CQ61 Digital-to-analog converter    
MEDIATEK MT6625LN 1628-AJC8L BAP0M972 ATG14T11 4-in-1 Wi-Fi / Bluetooth / FM / GPS   Datasheet
MEDIATEK MT6323LGA 1629-AGAH CTG14U07 Power management IC $2 Datasheet
MEDIATEK ARM MT8163V 1636-KBCAH CCMKYRHS 64-bit quad-core tablet platform $7.50 Website
MICRON 6PA98 JWB30 4GB LPDDR3 memory   Website
6521 OEW      
UL 1k16 A6 2S1107      

Top of Circuit Board #2

The second circuit board has the following components:

  • A ribbon cable connector that leads to the top circuit board
  • Two mechanical spring connectors (light green) that connect to the speaker
  • A digital-to-audio converter (orange)
  • An unknown microchip marked "MJ" (yellow)
  • An unknown microchip marked "XL" (purple) connects to the silver micro USB port
  • An audio jack that is mechanically fastened to the circuit board next to the micro USB port
  • Printed copper antennas (on the far left and far right of the circuit board)


Top-view of the second circuit board


Bottom of Circuit Board #2

The bottom of the second circuit board houses:

  • The power-management IC (yellow)
  • The Wi-Fi/Bluetooth chip (green)
  • A 64-bit quad-core processor (orange) that is also used in multiple tablets
  • 4GB of memory (red) used as a data buffer or for firmware upgrades
  • Unknown microchips marked "YA" (pink), "UL 1K16" (purple), "Jb 6mm" (cyan), "VB6MC" (brown), and "SKB" (pink)


Bottom view of the second circuit board


Two spring clips that are soldered onto the bottom of the second circuit board connect to two metal contacts on the speaker housing. The speaker housing is a hollow plastic cavity that amplifies the sound volume.



The second generation Amazon Echo Dot is built around Mediatek microchips. Mediatek, unfortunately, does not provide datasheets or technical briefs for these microchips on their website.  

This little device is quite easy to disassemble and reassemble and, as an added bonus, it works after reassembly.

Thanks for checking out this Teardown Tuesday! Be sure to come back next week to see what else we're tearing down.


Next Teardown: Wireless Home Remote

  • G
    g3vjm November 11, 2016

    What happened to the voice over?

    Like. Reply
    • Mark Hughes November 11, 2016
      Hi @g3vjm, That might be my fault, I'm not certain I sent the voice over along with the edited video. I'll try to fix that on the next one. Mark
      Like. Reply
  • T
    tompatriot November 15, 2016

    Hey quick question, how did you identify that MICRON 6PA98 JWB30 is MT29TZZZ4D4BKERL( as I dont find any reference for that on Google or any other search engine. Could you kindly explain that?

    Like. Reply
    • Mark Hughes November 16, 2016
      Hi @tompatriot, Not a problem -- it's not an easy thing to find. Micron FBGA (Fine Pitch Ball Grid Array) part numbers are encoded by Micron into a five digit code. Go to and input the second 5 digit code "JWB30" into the FBGA decoder to reveal the part number and use that to perform a search for the part at Micron MT29TZZZ4D4BKERL-125-W Search. I know it's a bit convoluted, but I hope that helps. Mark
      Like. Reply
      • T
        tompatriot November 16, 2016
        Thank you sir. appreciate that. Yupp it is a lot convoluted then I thought. Did you ever find the data sheet for it? As it looks like Micron protects it like a secret closely guarded. I am hoping eitehr JtagBox or some eMMC reader should help read the chip. Byw have you tried reading it any other way?
        Like. Reply
    • Mark Hughes November 16, 2016
      @tompatriot, Hello, new contributor. Micron device datasheets are protected through non-disclosure agreements. And while I didn't report on it, I did my due diligence by contacting Micron engineers who, off the record, told me about the microchips inside the Echo dot. Micron plays it extremely close to the vest -- the employee I spoke to was able to point me in the right direction (Southwest of the Pacific) without sharing anything about his colleagues across that great blue ocean. Anyhow -- as a contract employee of AAC, I can't help you with your endeavor, but I wish you the absolute best of luck. Please let me know if you discover more about the Echo and we'll post it here. Thanks, Mark
      Like. Reply
  • Robin Willis June 14, 2017


    The chip marked DAC3203I (referred to as DAC32031 above) looks to be a Texas Instruments DAC3203:, available on at least Digikey:

    I’ve just torn down my brand new Dot (3 for $130, bargain) to see if I can fool it into keeping the headphone output active at the same time as the speaker. No dice as yet…



    Like. Reply
  • J
    jjohnston February 07, 2020

    Is it normal when I check the voltage at the LED that it shows voltage when the light is off, then when its activated and the light comes on the voltage drops?  I’m new to electric circuits, but I would think voltage would go up when light wouldn’t it?

    Like. Reply