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I'm not convinced the mere fact that AliExpress sellers are not Sensirion distributors is sufficient to assume these sensors are counterfeit. Obviously there's
by ius 2y ago
I'm not convinced the mere fact that AliExpress sellers are not Sensirion distributors is sufficient to assume these sensors are counterfeit. Obviously there's precedence - buy a 'stm32' and you'll likely receive a counterfeit chip, but that's because these chips have been cloned by many. The Sensirion SCD40 is fairly niche and has an odd form factor - doesn't seem trivial to produce a convincing clone.
AliExpress sellers sell these at €14,99/1 whereas DigiKey is at €16,38/600 (excl. VAT). Price seems 'right' to me.
I have been looking for a comparison between sensors sourced from AliExpress and a reputable distributor, but sadly couldn't find any.
Anyway, I did get a few of these sensors off AliExpress for my personal projects. They definitely measure CO₂ (not eCO₂) - the only issues I've been having with them is the default calibration being off and a struggle to get the temperature reporting right (the sensor suffers from self-heating).
- bubulina 2y agoI ordered one SCD40 and two SCD41 sensor modules from AliExpress and I received them today. According to https://sensirion.com/media/documents/48C4B7FB/64C134E7/Sensirion_SCD4x_Datasheet.pdf https://sensirion.com/media/documents/48C4B7FB/64C134E7/Sens... (page 24) "All SCD4x sensors include a laser marking on the sidewall of the sensor cap. The laser marking contains the product variant (i.e., SCD40 or SCD41) and the product serial number within a data matrix". The SCD40 sensor that I received has the laser marking on the sidewall of the sensor cap, but none of the two SCD41 sensors has it. The price was ~€14 for SCD40 and ~€16 for SDC41. On Digikey they are currently €16.26 for one SCD40 (in a batch of 600) and €21.10 for one SCD41 (also in a batch of 600). What do you think is the lilelihood the SDC41s I received are fake?