LM75A High-Speed I2C Interface Temperature Sensor Module

LM75A High-Speed I2C Interface Temperature Sensor Module delivers accurate temperature monitoring with digital output over a two-wire I2C interface. Designers use it in embedded systems, industrial control, and smart devices where compact, low-power thermal sensing is required.

Key Features:

• High-Speed I2C Interface: Communicates directly with microcontrollers at up to 400 kHz.
• Wide Supply Range: Operates from 2.7 V to 5.5 V, compatible with 3.3 V and 5 V systems.
• Accurate Sensing: ±2 °C accuracy over most of the operating range.
• Programmable Alert Function: Provides thermal warning output for system protection.
• Low Power Consumption: Consumes only microamps in shutdown mode.
• Compact Module: Integrates pull-up resistors and header pins for easy prototyping.

Technical Specifications:

• Operating Voltage: 2.7 V – 5.5 V
• Interface: I2C bus, up to 400 kHz
• Temperature Range: −55 °C to +125 °C
• Accuracy: ±2 °C typical (−25 °C to +100 °C)
• Resolution: 9-bit to 12-bit (configurable)
• Shutdown Current: ~1 µA
• Response Time: Fast digital conversion for real-time monitoring

Mechanical Specifications:

• Module Type: LM75A sensor breakout board
• PCB Material: FR-4 with solder mask
• Connector Type: 4-pin header for easy wiring
• Mounting: Standard pin headers for breadboard or PCB use

Dimensions:

• Board Size: Approx. 18 mm × 12 mm
• Pin Pitch: 2.54 mm (standard header spacing)
• Profile Height: ~3 mm excluding pins

Pinout and Wiring:

• VCC: Power supply (2.7–5.5 V)
• GND: Ground
• SDA: Serial data line (I2C)
• SCL: Serial clock line (I2C)
• OS/INT: Overtemperature shutdown / interrupt output (optional)
• Wiring Note: Connect SDA and SCL to microcontroller I2C pins with pull-up resistors. Use VCC and GND for power.

Datasheet Reference:

• Download the official LM75A datasheet from NXP or TI for complete electrical characteristics, timing diagrams, and application examples.

Applications:

• Embedded Systems: Provide thermal feedback for microcontroller-based projects.
• Industrial Control: Protect machinery and equipment from overheating.
• Smart Home Devices: Monitor environmental temperature in IoT nodes.
• Battery Management Systems: Track pack temperature to ensure safe charging and discharging.
• Consumer Electronics: Add thermal monitoring to appliances and gadgets.

Equivalent Models:

• LM75: Original version with similar I2C interface
• LM75B: Improved variant with enhanced accuracy
• TC74: Microchip I2C digital temperature sensor alternative
• ADT75: Analog Devices I2C temperature sensor

Package Includes:

• 1 x LM75A High-Speed I2C Interface Temperature Sensor Module