Texas Instruments LM75BIMX-5

Overview

LM75BIMX-5 from Texas Instruments is a digital temperature sensor and thermal watchdog IC with integrated 9-bit sigma-delta ADC, I²C interface, and programmable over-temperature shutdown output (O.S.). It delivers ±2°C accuracy from –25°C to 100°C, operates from 3 V to 5.5 V, draws 280 μA typical active current, and supports up to eight devices on one bus-used in PC motherboard thermal monitoring, base station power management, and embedded system thermal safety circuits.

For engineers reviewing the LM75BIMX-5 datasheet, LM75BIMX-5 pinout, LM75BIMX-5 application, or LM75BIMX-5 equivalent, key selection considerations include its open-drain O.S. interrupt behavior, fault-queue programmability (1–6 consecutive faults), comparator vs. interrupt mode configuration, and SOIC-8 package compatibility with legacy thermal sensor footprints.

Technical Context

The LM75BIMX-5 implements a silicon bandgap temperature sensor feeding a 9-bit sigma-delta ADC with 0.5°C LSB resolution. Its I²C interface complies with standard-mode (100 kHz) and fast-mode (400 kHz) timing, featuring built-in low-pass filtering on SDA/SCL lines for noise immunity-exclusive to the LM75B variant.

It supports two functional modes: comparator mode (O.S. toggles between T_OS and T_HYST) and interrupt mode (O.S. latches until register read). The O.S. output is open-drain, programmable for polarity and fault tolerance (1–6 conversions), and defaults to active-low comparator operation at power-up with T_OS = 80°C and T_HYST = 75°C.

Key Specifications

Pinout & Package

LM75BIMX-5 is housed in an 8-pin SOIC (D) package measuring 4.90 mm × 3.91 mm, with standard JEDEC MS-012AC footprint and gull-wing leads. Thermal resistance is R_θJA = 115.2°C/W under typical PCB conditions.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar digital temperature sensor applications.

Compared with LM75CIMX-5, LM75BIMX-5 adds hardware-level I²C noise suppression and bus recovery-critical for industrial motion control. Versus STTS751DT, it trades resolution for configurability (addressing, fault tolerance, dual operating modes) and broader temperature range support.

Availability

LM75BIMX-5 is available at Aetrix Electronics and suitable for server thermal management, industrial PLC safety systems, telecom power shelf monitoring, and medical imaging power module protection requiring stable component supply across extended product lifecycles.

Supply support for LM75BIMX-5 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader delivering analog and embedded processing solutions, with over 50 years of innovation in precision sensing, power management, and interface technologies.

The LM75BIMX-5 belongs to TI's industry-standard digital temperature sensor family, designed specifically for thermal monitoring and overtemperature protection in computing, communications, and industrial systems where reliability, ease of integration, and I²C compatibility are essential.

FAQ

What is the default power-up configuration of the LM75BIMX-5?

At power-up, the LM75BIMX-5 initializes in comparator mode with T_OS = 80°C, T_HYST = 75°C, O.S. active low, pointer register set to the Temperature register (000), and shutdown disabled. This allows immediate stand-alone thermostat operation without I²C initialization-ideal for fail-safe thermal monitoring in systems where the host processor may be unresponsive during boot.

Does the LM75BIMX-5 require external components for basic operation?

No, the LM75BIMX-5 requires no external passive components for core functionality. A 100 nF ceramic bypass capacitor on +VS is recommended but not strictly required for short-duration operation. Pull-up resistors on SDA and SCL are mandatory for I²C communication, and an external pull-up on O.S. is needed to assert a logic-high level when inactive. No trimming, calibration, or compensation networks are necessary.

How does the fault queue feature improve reliability in noisy systems?

The LM75BIMX-5's programmable fault queue (1–6 consecutive over-limit readings) prevents spurious O.S. activation caused by transient electrical noise or momentary thermal spikes. For example, setting the queue to 4 means four full temperature conversions must exceed T_OS before O.S. asserts-effectively filtering out single-cycle glitches common in motor drive or switch-mode power supply environments where the LM75BIMX-5 is frequently deployed.

Can the LM75BIMX-5 operate on a 3.3 V supply?

Yes, the LM75BIMX-5 is fully specified and tested for operation from 3.0 V to 5.5 V. At 3.3 V, its typical active current is 280 μA and shutdown current remains 4 μA. All timing parameters-including I²C clock frequency up to 400 kHz and conversion time of 100 ms-remain valid. The device maintains ±2°C accuracy from –25°C to 100°C across this entire voltage range, making LM75BIMX-5 suitable for mixed-voltage embedded systems.

What is the difference between comparator mode and interrupt mode in the LM75BIMX-5?

In comparator mode, the LM75BIMX-5's O.S. output behaves like a hardware thermostat: it goes active when temperature exceeds T_OS, and deactivates only after falling below T_HYST. In interrupt mode, O.S. activates at T_OS and stays active until any register is read via I²C-or the device enters shutdown. Interrupt mode is used for event logging or non-self-resetting alerts; comparator mode suits direct hardware control like fan enable/disable.