Inside the Amazon Echo Dot (5 Gen): A Complete Teardown

In the January I did the teardown of Amazon Echo Dot (3rd Gen). When recently, their 5th Generation of Amazon Echo Dot came, I was curious what changes they might have done to improve the performance of the device and what new features they have added and how 🙂

Inside the Amazon Echo Dot (5 Gen): A Complete Teardown 1

So what is new in the Amzon Echo Dot 5th Generation, it is basically provides better experience with much clear voice quality, deeper bass, better sound quality

Additionally a temperature sensor is also added to measure ambient temperature.

In this version Amazon has used their in-house developed Wi-Fi Connectivity equipment with Mesh technology (as a PCB module).

What is the difference from User point of view?

  • Amazon Echo Dot 5 doesn’t have Aux Audio port, so you cannot connect it to any other device via audio port.
  • Amazon Echo Dot 5 has a larger speaker measuring 1.73 inches with an improved audio quality.
  • Amazon Echo Dot 5 has a new in-built temperature sensor.
  • Amazon Echo Dot 5 and Echo Dot 4 are of same size (100 x 100 x 89mm).

Now, let us dive in and see how it is built.

Packaging is absolutely fantastic.

In the box, you will get the Amazon Echo Dot, User Manual and 12V at 1.25A 15W charger. And, the charger is also designed by Amazon only.

I purchased this from Amazon.in for around 4500 INR.

Inside the Amazon Echo Dot (5 Gen): A Complete Teardown 2
Inside the Amazon Echo Dot (5 Gen): A Complete Teardown 3
Inside the Amazon Echo Dot (5 Gen): A Complete Teardown 4

the power supply which comes with the Amazon Echo Dot 5th Gen is a 15W(12V, 1.25A) 230V AC Adapter with a DC Pin. It would have been in my opinion to provide a USB-C type connector for the Power.

Inside the Amazon Echo Dot (5 Gen): A Complete Teardown 5

Amazon Echo Dot from outside is not very different than its previous version.

Inside the Amazon Echo Dot (5 Gen): A Complete Teardown 6
Inside the Amazon Echo Dot (5 Gen): A Complete Teardown 7

To further open you need see the bottom side, rubber pad is there, once you remove that, you will get access to the screws which need to be opened to get inside.

Clearly mentioned Assembled in CHINA.

Inside the Amazon Echo Dot (5 Gen): A Complete Teardown 8
Inside the Amazon Echo Dot (5 Gen): A Complete Teardown 9

The 9 pads you see from the square hole is basically for programming and testing in the production.

Inside the Amazon Echo Dot (5 Gen): A Complete Teardown 10
Inside the Amazon Echo Dot (5 Gen): A Complete Teardown 11

Amazon Echo Dot 5th Gen MIC Array PCB

Once you remove the screws and open, you can see this:

In the left picture you see plastic diffuser ring which comes on the top of the LED, this helps spreading the light from the LEDs equally.

You can also see a RFID tag, that is mainly used in the manufacturing for tracking the devices or parts.

In the other 3 images what you see is the main controller board which has the main power supply, processor and LED ring, Wi-Fi Connectivity.

Inside the Amazon Echo Dot (5 Gen): A Complete Teardown 12
Inside the Amazon Echo Dot (5 Gen): A Complete Teardown 13
Inside the Amazon Echo Dot (5 Gen): A Complete Teardown 14
Inside the Amazon Echo Dot (5 Gen): A Complete Teardown 15

There is another PCB, which has MEM MIC, ambient light sensor and Button, this PCB is basically connected to the main PCB via Flexible cable.

Inside the Amazon Echo Dot (5 Gen): A Complete Teardown 16
Inside the Amazon Echo Dot (5 Gen): A Complete Teardown 17
Inside the Amazon Echo Dot (5 Gen): A Complete Teardown 18

Plastic structure which holds the four buttons and provides MIC access via PCB holes.

Inside the Amazon Echo Dot (5 Gen): A Complete Teardown 19

The MIC array PCB looks like this: It has 3 MICs (MK1, MK2, MK4), provision for 4th(MK3) one but not mounted. all 4 MIC connections are going to Texas Instruments IC TLV320ADC5140.

Three Microphones are used for beam forming to know the direction of the audio and also used for noise cancellation.

Inside the Amazon Echo Dot (5 Gen): A Complete Teardown 20
Inside the Amazon Echo Dot (5 Gen): A Complete Teardown 21

The TLV320ADC5140 is a Burr-Brown™ high performance, audio analog-to-digital converter (ADC)
that supports simultaneous sampling of up to four analog channels or eight digital channels for the pulse density modulation (PDM) microphone input.

Inside the Amazon Echo Dot (5 Gen): A Complete Teardown 22

There are several regulators on board like U3, VR1.

Inside the Amazon Echo Dot (5 Gen): A Complete Teardown 23
Inside the Amazon Echo Dot (5 Gen): A Complete Teardown 24
Inside the Amazon Echo Dot (5 Gen): A Complete Teardown 25

There are two more ICs – U6 and U1(45575 N211J UAA), I could not find any trace of these ICs on the internet using the SMD marking on the device.

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Inside the Amazon Echo Dot (5 Gen): A Complete Teardown 27

The other side of the PCB, we have Dome type switches, ambient light sensor(probably I2C based), 2x LEDs and you can clearly see MIC holes as well.

Inside the Amazon Echo Dot (5 Gen): A Complete Teardown 28
Inside the Amazon Echo Dot (5 Gen): A Complete Teardown 29
Inside the Amazon Echo Dot (5 Gen): A Complete Teardown 30
Inside the Amazon Echo Dot (5 Gen): A Complete Teardown 31

Bigger internal structure basically holds the main PCB from outside and inside it hold the speaker.

Inside the Amazon Echo Dot (5 Gen): A Complete Teardown 32

this aluminum plate is basically to spread the heat from the main processor board. You can see the thermal bad in the center.

Inside the Amazon Echo Dot (5 Gen): A Complete Teardown 33

Amazon Echo Dot 5th Gen Speaker Section

Inside the Amazon Echo Dot (5 Gen): A Complete Teardown 34
Inside the Amazon Echo Dot (5 Gen): A Complete Teardown 35
Inside the Amazon Echo Dot (5 Gen): A Complete Teardown 36

There is no mentioned about the ohms or wattage of the speaker anywhere just the QR code which has some internal part code I guess.

Inside the Amazon Echo Dot (5 Gen): A Complete Teardown 37
Inside the Amazon Echo Dot (5 Gen): A Complete Teardown 38
Inside the Amazon Echo Dot (5 Gen): A Complete Teardown 39
Inside the Amazon Echo Dot (5 Gen): A Complete Teardown 40

Amazon Echo Dot 5th Gen – Main Processor Board

The most interesting part in the device for many engineers is the main processor board. Everyone want to know which processor is used where they run their local AI engine, what is the RAM size, which and how much is the flash used, how did they do the Wi-Fi Connectivity, etc. So, let us dive in to that portion.

The processor board looks like this from the top. Here, what mostly you will see is a lor fo different power supply sections.

Inside the Amazon Echo Dot (5 Gen): A Complete Teardown 41

U7 is basically looking like a multiple rail dc dc converter IC from Mediatek Part number mentioned is MT6398BN, I could not find a datasheet on internet.

Inside the Amazon Echo Dot (5 Gen): A Complete Teardown 42

Another Shielded Power section(U10, L10) is there, shield is to reduce the emissions.

Inside the Amazon Echo Dot (5 Gen): A Complete Teardown 43
Inside the Amazon Echo Dot (5 Gen): A Complete Teardown 44

Besides this power supply you will find Audio Amplifier circuit which uses Analog Devices Maxim Integrated MAX98396EWB  (U15). The Echo Dot speaker is driven by this Digital Input mono Class-DG Amplifier with an output power of 20W into 8 ohms / 19W into 4 ohms.

Inside the Amazon Echo Dot (5 Gen): A Complete Teardown 45

Another thing to note on this side of the PCB is the 12 RGB LEDs on the perimeter.

Inside the Amazon Echo Dot (5 Gen): A Complete Teardown 41

Now, let us see what is there on the bottom side of the Main PCB.

You can see J3 which is DC input jack, where you connect the power supply.

At the center is the main processor section which includes the processor(U1), DRAM(U3) and Flash(U4).

Amzon Echo Dot 5 uses an AZ2 processor, an updated version of the Amazon Neural Edge processor. It is marked MT8519BAAV, Micron NW942 Nand flash IC is used for the OS and data storage.

DRAM is provided with an SK Hynix H54926AY 0.5GB model with a 4266Mbps throughput.

and just below that you a PCB module, it is basically a Wi-Fi/Bluetooth module. You can see antenna on the PCB on both sides.

Inside the Amazon Echo Dot (5 Gen): A Complete Teardown 47

You can see the shield pads around this section, actually there was a shield, I just removed it.

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Inside the Amazon Echo Dot (5 Gen): A Complete Teardown 49

Just below the processor section you have Wi-Fi connectivity module, in-house developed by the Amazon’s team.

It also uses a MediaTek Chipset (MT7653BSN).

Inside the Amazon Echo Dot (5 Gen): A Complete Teardown 50
Inside the Amazon Echo Dot (5 Gen): A Complete Teardown 51

There is Flex Cable which goes to the MIC array PCB I have shown you above.

Inside the Amazon Echo Dot (5 Gen): A Complete Teardown 52
Inside the Amazon Echo Dot (5 Gen): A Complete Teardown 53

And, that’s not all.

Amazon developed their charger also by themselves so I took it apart as well. Let me show you inside of the charger which is 15W charger (12V 1.25A), it has DC pin output connector.

Inside the Amazon Echo Dot (5 Gen): A Complete Teardown 5

Opening the enclosure was a tough game, you can see the battle marks 🙂

Inside the Amazon Echo Dot (5 Gen): A Complete Teardown 55
Inside the Amazon Echo Dot (5 Gen): A Complete Teardown 56
Inside the Amazon Echo Dot (5 Gen): A Complete Teardown 57
Inside the Amazon Echo Dot (5 Gen): A Complete Teardown 58

The black plate you see is nothing but a plastic separator, Aluminum sheet is for heat spreading.

Inside the Amazon Echo Dot (5 Gen): A Complete Teardown 59

The PCB is single sided as you will see in most of the power supply designs, to keep cost low. Looking at the PCB and components, design looks well designed, really good.

At the input AC side, you can see EMI filter is used and then using a bridge rectifier goes to the AC to DC power converter IC.

Inside the Amazon Echo Dot (5 Gen): A Complete Teardown 60

On the output side also you can see an inductor is used for post AC to DC filtering. this is not common to see in any low cost power supply or charger designs.

Quality of the transformer also looks really decent.

Inside the Amazon Echo Dot (5 Gen): A Complete Teardown 61
Inside the Amazon Echo Dot (5 Gen): A Complete Teardown 62

Bridge Rectifier RABS21

Inside the Amazon Echo Dot (5 Gen): A Complete Teardown 63

They have used Power Integration’s device (SC1616C) form its InnoSwitch Series.

Inside the Amazon Echo Dot (5 Gen): A Complete Teardown 64
Inside the Amazon Echo Dot (5 Gen): A Complete Teardown 65

Other than the InnoSwitch from Power integrations, there is another device used, you can see on the left side in the image below. IC Part number is SE120N10L2, looks like ideal diode.

Inside the Amazon Echo Dot (5 Gen): A Complete Teardown 66

That’s all from my side on this teardown. I hope you enjoyed reading and learned something new.

Do share with your friends so that they can learn too.


I am currently working as an embedded systems design consultant and helping companies build custom embedded products, develop test automation solution for their PCB.

If you have any feedback about the blog, you can share in the comments below or you can also contact me directly.


6 comments

  1. Good tear down. Lots of interesting information. So …were you able to assemble it all back again for it to work as before? 🙂

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