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NEW PRODUCT – Breadboard Friendly I2C Temperature Sensor – TC74A0 – TC74A0-5.0VAT

4375 top demo ORIG 2019 09

NEW PRODUCT – Breadboard Friendly I2C Temperature Sensor – TC74A0 – TC74A0-5.0VAT


It’s rare to see breadboard friendly I2C sensors, but this TO-220 package with 5 pins is, in fact, such a thing! It’s a basic temperature sensor, not the highest precision in the world, only ±2°C but it will get the job done when you need simple temperature logging or monitoring.

4375 top ORIG 2019 09

Wiring it up is easy, pin 2 is SDA, middle pin is GND, pin 4 is SCL and the rightmost pin 5 is VDD. You can power it with 3.3 or 5V logic so it’s good for any microcontroller or microcomputer. Note you will need to add I2C pull-ups on your breadboard especially if your I2C controller does not have them built in already

For Arduino code, you can use our PCT2075 library (this chip and that library both use the same LM75 compatible code). For CircuitPython or Python 3, our Python PCT2075 library will work as well.

Comes as just one through hole sensor.

4375 iso

4375 quarter resize ORIG 2019 09

In stock and shipping now!


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1 Comment

  1. I have found that the TC74A is not completely I2C compatible, and you may have trouble using it with some processors. The I2C specification requires a data hold time for I2C devices of 0 ns, but the TC74A datasheet specifies a minimum hold time of 1250 ns. If a microcontroller has an I2C interface that is designed to operate up to 1 MHz (Fast-mode Plus) then a hold time of 1250 ns is longer than the SCLK period, so it doesn’t surprise me that a fast microcontroller would provide a data hold time much, much less than 1250 ns.

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