From: Neil <picdude3@narwani.org>
To: Microcontroller discussion list - Public. <piclist@mit.edu>
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Date: Sat, 25 Jul 2020 07:24:36 -0700
Subject: Re: [EE]:: Your DS18B20 temperature sensor is likely a fake,
	counterfeit, clone...
Thread-Topic: [EE]:: Your DS18B20 temperature sensor is likely a fake,
	counterfeit, clone...
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I'd be surprised if anyone on here is surprised by this.
I've always just "known"/accepted that an expensive part from an=20
American company coming from the far east at maybe 1/10th the price=20
couldn't be real.  I expected it would be very inaccurate, but not=20
surprised about the functional issues they mentioned.

Cheers,
-Neil.




On 7/25/2020 8:19 AM, RussellMc wrote:
> https://github.com/cpetrich/counterfeit_DS18B20
>
> ... unless you bought the chips directly from Maxim Integrated
> <https://www.maximintegrated.com/en/products/sensors/DS18B20.html> (or
> Dallas Semiconductor in the old days), an authorized distributor
> <https://www.maximintegrated.com/en/aboutus/contact-us/distributor-office=
s.html>
> (DigiKey,
> RS, Farnell, Mouser, etc.), or a big retailer, or you took exceptionally
> good care purchasing waterproofed DS18B20 probes. We bought over 1000
> "waterproof" probes or bare chips from more than 70 different vendors on
> ebay, AliExpress, and online stores -big and small- in 2019. All of the
> probes bought on ebay and AliExpress contained counterfeit DS18B20 sensor=
s,
> and almost all sensors bought on those two sites were counterfeit.
>
> Author: Chris Petrich, 25 July 2020. License: CC BY. Source:
> https://github.com/cpetrich/counterfeit_DS18B20/
>
> (Sensor information based on sensors or probes ordered well into 2020
> rather than in or around 2019 are marked "*(2020)*".)

--=20
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