Attributes

Brand	-
Category	Robotics / STEM Teaching Tools / Sensors
Origin	-
Sensor Model	LM75A
Interface Type	I2C (Inter-Integrated Circuit)
Temperature Range	-55°C to +125°C
Accuracy	±0.5°C (typical at 25°C)
Resolution	9-bit to 12-bit configurable
Operating Voltage	2.7V to 5.5V
Package Type	SOIC-8 on Breakout Board
Address Pins	3 Address Select Pins (A0, A1, A2)
Board Dimensions	20mm x 15mm x 2mm
Application	Industrial Control, HVAC, IoT Projects

6 reviews

Anonymous

Mar 28, 2026

Rating: 4/5

Great little board

Works great for my home automation system. The breakout pins are clearly labeled. Deducting one star only because it doesn't come with header pins soldered, but that's expected for this price point.

Anonymous

Mar 27, 2026

Rating: 5/5

Perfect for Arduino Projects

This LM75A module worked flawlessly with my Arduino Uno. The I2C communication was stable, and the temperature readings were consistent with my calibrated thermometer. Highly recommended for hobbyists.

Anonymous

Mar 27, 2026

Rating: 5/5

Best LM75A module I've bought

Clean PCB design and robust components. I've been running it continuously for two weeks without any drift or connection drops. Will definitely buy more for future projects.

Anonymous

Mar 14, 2026

Rating: 4/5

Good precision, easy to integrate

Solid sensor module. Integration with ESP32 was straightforward using standard libraries. The only minor issue is that the silk screen for the address pins is a bit small, but otherwise excellent value.

Anonymous

Mar 14, 2026

Rating: 5/5

Excellent accuracy

I compared this against a professional grade sensor and the variance was negligible. The ability to configure resolution via software is a nice touch for optimizing power consumption.

Anonymous

Mar 04, 2026

Rating: 5/5

Reliable and Fast Shipping

Arrived well-packaged. Tested immediately upon receipt, and the high-speed I2C interface performs exactly as described. Great for monitoring server room temperatures.

5 FAQ

Q: What is the default I2C address?

A: The default I2C address is 0x4F when all address pins (A0, A1, A2) are left floating or connected to GND. You can change this by connecting the pins to VCC.

Q: Which library should I use for Arduino?

A: You can use the standard 'Wire' library included with the Arduino IDE. There are also specific LM75 libraries available in the Library Manager that simplify reading temperature values.

Q: Can I use this outdoors?

A: While the sensor chip itself handles a wide temperature range, the breakout board is not weatherproof. For outdoor use, please enclose it in a waterproof housing.

Q: Is this compatible with 3.3V logic levels?

A: Yes, the LM75A operates from 2.7V to 5.5V, making it fully compatible with both 3.3V and 5V microcontrollers like ESP32, Raspberry Pi, and Arduino.

Q: Does this module come with header pins pre-soldered?

A: No, the module is shipped without header pins soldered to allow for flexible mounting options. You will need to solder them yourself if required.

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