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!

As 2022 starts, let’s take some time to share our goals for CircuitPython in 2022. Just like past years (full summary 2019, 2020, and 2021), we’d like everyone in the CircuitPython community to contribute by posting their thoughts to some public place on the Internet. Here are a few ways to post: a video on YouTub, a post on the CircuitPython forum, a blog post on your site, a series of Tweets, a Gist on GitHub. We want to hear from you. When you post, please add #CircuitPython2022 and email to let us know about your post so we can blog it up here.

Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on, jump into CircuitPython to learn Python and hardware together, TinyGO, or even use the Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for CircuitPython, MakeCode, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.

Join 32,000+ makers on Adafruit’s Discord channels and be part of the community!

Have an amazing project to share? The Electronics Show and Tell is every Wednesday at 7pm ET! To join, head over to YouTube and check out the show’s live chat – we’ll post the link there.

Join us every Wednesday night at 8pm ET for Ask an Engineer!

Follow Adafruit on Instagram for top secret new products, behinds the scenes and more

CircuitPython – The easiest way to program microcontrollers –

Maker Business — Pololu’s account of the chip shortage

Wearables — Monster-inspired costuming!

Electronics — How to make your own magnetic field probe!

Python for Microcontrollers — Python on Microcontrollers Newsletter: New Releases of MicroPython and CircuitPython and more! #Python #CircuitPython @micropython @ThePSF

Adafruit IoT Monthly — 2021 in Recap!

Microsoft MakeCode — MakeCode Thank You!

EYE on NPI — Maxim’s Himalaya uSLIC Step-Down Power Module #EyeOnNPI @maximintegrated @digikey

New Products – Adafruit Industries – Makers, hackers, artists, designers and engineers! — NEW PRODUCT – Hot Air Helper Rework Station Plate with Two Ring Clamps

Get the only spam-free daily newsletter about wearables, running a "maker business", electronic tips and more! Subscribe at !

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.

Sorry, the comment form is closed at this time.