Attributes

Brand	-
Category	Robotics / STEM Teaching Tools / Sensors
Origin	-
Sensor Model	LM75AD / LM75BD
Interface Type	I2C (Inter-Integrated Circuit)
Operating Voltage	2.7V to 5.5V
Temperature Range	-55°C to +125°C
Accuracy	±2°C (typical) from -25°C to +80°C
Resolution	9-bit to 12-bit configurable
Conversion Time	Max 150ms at 12-bit resolution
Package Type	SOIC-8 on Breakout Board
Pin Count	5 Pins (VCC, GND, SDA, SCL, A0)
Application	Embedded Systems, HVAC, Industrial Monitoring

6 reviews

Anonymous

Mar 29, 2026

Rating: 5/5

Reliable high-speed interface

Needed a sensor that could keep up with fast polling rates for a data logger. This LM75 module handles the speed without dropping packets.

Anonymous

Mar 28, 2026

Rating: 5/5

Compact and robust

Great form factor for tight spaces in my enclosure. The soldering points are clear, and the chip seems durable. Highly recommended for prototyping.

Anonymous

Mar 21, 2026

Rating: 5/5

Perfect for Arduino Projects

This module works flawlessly with my Arduino Uno. The I2C communication is stable, and the library support is excellent. Reading temperatures was straightforward.

Anonymous

Mar 21, 2026

Rating: 5/5

Excellent precision for the price

I bought three of these for a multi-zone monitoring system. All three sensors provided consistent readings relative to each other. Very satisfied.

Anonymous

Mar 14, 2026

Rating: 4/5

Good value, accurate readings

Compared the readings against a calibrated thermometer, and it was within 1 degree Celsius. The breakout board makes wiring very easy for beginners.

Anonymous

Mar 05, 2026

Rating: 4/5

Works as expected

No issues setting it up with Raspberry Pi. Just had to enable the I2C interface in the config. Documentation could be slightly better, but plenty of online examples exist.

5 FAQ

Q: Is a pull-up resistor required for SDA and SCL lines?

A: Most breakout boards include onboard pull-up resistors. If your specific module does not have them marked, we recommend adding 4.7kΩ resistors to ensure stable I2C communication.

Q: Can I use this outdoors?

A: The sensor chip itself is rated for -55°C to +125°C, but the breakout board is not waterproof. You must place it in a weatherproof enclosure for outdoor use.

Q: How do I increase the temperature resolution?

A: You can configure the resolution from 9 to 12 bits by writing to the Configuration Register via the I2C interface. Higher resolution increases accuracy but also increases conversion time.

Q: What is the default I2C address?

A: The default I2C address is typically 0x48. You can change the last three bits of the address by configuring the A0, A1, and A2 pins if your board exposes them, though this specific breakout usually fixes the address via the A0 pin.

Q: Does this module work with 3.3V logic levels?

A: Yes, the LM75 sensor operates between 2.7V and 5.5V, making it fully compatible with both 3.3V and 5V microcontrollers.

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