QT18B20 a good replacement for DS18B20

1m cable with a waterproof probe with 7Q Technology QT18B20 temperature sensor (compatible with DS18B20) embedded inside a metal shell.

Specification:

• Sensor chip
  • Manufacturer: 7Q Technology
  • Model: QT18B20
  • Protocol: OneWire compatible with DS18B20
  • Supply voltage: from 3.0V to 5.5V
  • Measurement range: -55°C to 125°C
  • Measurement accuracy: ± 0.5°C (in the range of -10°C to + 85°C)
  • Resolution: 9 to 12 bits
• Cable length: 1m
• Shell diameter: 6mm
• Works with standard and parasitic power
• Leads:
  • Black - GND
  • Red - Vcc
  • Yellow - signal

We can check the address for you!

If you need a QT18B20 / DS18B20 sensor with a known address - we can check it for you. All you need to do is add the address checking service to your shopping cart, and you will receive the sensor with a label attached.

Substitutes, clones and fakes
The market is full of bad DS18B20 clones. Among the counterfeit sensors and poor-quality replacements sold as originals, you can easily find ones that not only do not meet the specifications, but also do not work in parasitic mode. This is especially problematic with waterproof cable sensors, where the system is cast in a metal core with resin and there is no non-invasive way to optically inspect it.
Way to check and classify sensors
But if you can’t view something, that doesn’t mean there aren’t any other ways to find out what’s inside. We test the sensors we sell with a script written by Chris Petrich. The script allows you to accurately check parameters and classify sensors. It is a priority for us that the sensors we described as DS18B20 actually are such sensors. We also sell very good quality replacements (e.g. QT18B20), but it is clearly stated in the product description.
We control each bulk package
It is impractical to check every single sensor. The process takes a long time, which means we would have to increase the price of the sensors a lot. In each delivery, we receive many bulk packages with 10 to 50 sensors. We carry out random checks in each such package. We assume that no one in the factory has mixed up the sensors within one package - this is unlikely to happen. In this way, we can confidently claim that we know what we are selling.

Low price is very important factor. Our customers often look for the cheapest DS18B20 sensors. To be fair to customers, we decided that introducing the QT18B20 to the offer would be a good compromise between quality and price.