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LM75BDP

I2C digital temp sensor, 11-bit 0.125°C, ±2°C accuracy, OS output, TSSOP-8

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Manufacturer Part：

LM75BDP

Package：

TSSOP-8 (4.9 x 3.0 x 1.1mm)

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Description

Product Overview

The LM75BDP from NXP Semiconductors is a digital temperature sensor and thermal watchdog with I2C/SMBus interface in a TSSOP-8 package. It provides 11-bit (0.125°C) resolution temperature-to-digital conversion from -55°C to +125°C, with programmable overtemperature shutdown and hysteresis outputs.

Key Specifications

Temperature Range -55°C to +125°C
Resolution 11-bit (0.125°C)
Accuracy ±2°C (-25°C to +100°C)
Interface I2C / SMBus (up to 400kHz)
Supply Voltage 2.8V to 5.5V
Supply Current (Active) 1mA typ.
Supply Current (Shutdown) 3.5μA typ.
Conversion Time 100ms typ.
OS Output Type Open-drain (active low)
I2C Addresses 8 selectable (via A0-A2 pins)
Package TSSOP-8
Operating Temperature -55°C to +125°C

Features

  • 11-bit temperature resolution (0.125°C)
  • ±2°C accuracy from -25°C to +100°C
  • I2C/SMBus compatible interface (up to 400kHz)
  • Programmable overtemperature shutdown (OS) output
  • Programmable hysteresis threshold
  • 8 selectable I2C addresses (A0-A2 pins)
  • Shutdown mode for power conservation (3.5μA)
  • One-shot conversion mode
  • Drop-in compatible with industry-standard LM75

Applications

  • System temperature monitoring
  • PC and server thermal management
  • Industrial temperature sensing
  • Battery temperature monitoring
  • Hard disk drive temperature protection

The LM75BDP from NXP Semiconductors is a temperature-to-digital converter using an on-chip bandgap temperature sensor and sigma-delta ADC with 11-bit resolution (0.125°C). The device provides an overtemperature shutdown (OS) output with programmable threshold and hysteresis, making it ideal as a thermal watchdog. The I2C/SMBus compatible interface supports up to 400kHz clock speed, and up to 8 devices can share the same bus via the A0-A2 address select pins. A shutdown mode reduces current consumption to 3.5μA for power-sensitive applications. Pin-for-pin compatible with the industry standard LM75 and LM75A.

The LM75BDP uses a bandgap temperature sensor whose output voltage is proportional to absolute temperature (PTAT). This analog voltage is digitized by an internal sigma-delta ADC to produce an 11-bit two’s complement temperature value. The temperature register is continuously updated at a default rate of one conversion every 100ms. The OS output compares the measured temperature against two programmable thresholds: Tos (overtemperature shutdown) and Thyst (hysteresis). When temperature exceeds Tos, the OS pin activates (active low, open-drain). The OS pin deactivates only when the temperature drops below Thyst, providing a stable thermostat behavior without oscillation.

Pin Name Type Function
1 SDA I/O I2C serial data (bidirectional)
2 SCL Input I2C serial clock
3 OS Output Overtemperature shutdown output (open-drain)
4 GND Power Ground
5 A2 Input I2C address select bit 2
6 A1 Input I2C address select bit 1
7 A0 Input I2C address select bit 0
8 VCC Power Supply voltage (2.8V to 5.5V)
  • PC and server motherboard thermal monitoring and fan control
  • Industrial equipment overtemperature alarm and protection
  • Battery pack temperature monitoring in EV and UPS
  • Hard disk drive thermal protection
  • Multi-zone temperature sensing with up to 8 sensors on one bus
Manufacturer Part Number Package Notes
TI LM75BDP/NOPB TSSOP-8 Pin-compatible, same function
ADI ADT75BRZ SOIC-8 12-bit, 0.0625°C resolution
Microchip AT30TS750A-MA8M-T SOIC-8 12-bit, programmable alert
ST STDS75 SOIC-8 12-bit, 0.0625°C, pin-compatible
Maxim DS75S+ SOIC-8 12-bit, 0.0625°C, auto-conversion
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Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

Shipping & Payment

All electronic components we source from our partnered supply chains go through strict incoming inspections.Through careful testing, we ensure everything delivered to customers is genuine original parts and meets quality requirements.In addition, we keep complete inspection records to make the entire supply chain process clear and traceable.

Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

Service & Packaging

All electronic components we source from our partnered supply chains go through strict incoming inspections.Through careful testing, we ensure everything delivered to customers is genuine original parts and meets quality requirements.In addition, we keep complete inspection records to make the entire supply chain process clear and traceable.

Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

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