A simple I2C temperature sensor in a breadboard-friendly TO-220 package. The TC74A0 provides basic temperature readings with ±2°C accuracy — a straightforward choice when you need easy temperature logging or monitoring without fussing over complex wiring.

Works with both 3.3 V and 5 V logic, making it compatible with virtually any microcontroller or single-board computer. Uses the LM75-compatible I2C protocol, so existing libraries work out of the box.

Key Features

• TO-220 Package – 5-pin, plugs directly into a breadboard
• I2C Interface – SDA (pin 2), GND (centre), SCL (pin 4), VDD (pin 5)
• ±2°C Accuracy – Suitable for general-purpose temperature monitoring
• 3.3 V or 5 V Compatible – Works with any logic level
• LM75-Compatible Protocol – Supported by widely available libraries
• Recommended I2C Speed – 100 kHz or 400 kHz

Ideal For

• Quick temperature logging and monitoring
• Breadboard prototyping with I2C sensors
• Learning I2C communication basics

Package Contents

• 1× TC74A0 I2C Temperature Sensor (through-hole, TO-220)

Resources

• Arduino PCT2075 Library (LM75-compatible)
• CircuitPython / Python PCT2075 Library