Texas Instruments LM75BIMM-3/NOPB

Overview

LM75BIMM-3/NOPB from Texas Instruments is a digital temperature sensor and thermal watchdog IC with integrated 9-bit sigma-delta ADC, I²C interface, and programmable overtemperature shutdown output (O.S.). It delivers ±2°C accuracy from –25°C to 100°C, operates from 3 V to 5.5 V, draws only 4 μA in shutdown mode, and supports up to eight devices on a single I²C bus - used for real-time thermal monitoring in embedded power supplies and industrial controllers.

For engineers reviewing the LM75BIMM-3/NOPB datasheet, LM75BIMM-3/NOPB pinout, LM75BIMM-3/NOPB application, or LM75BIMM-3/NOPB equivalent, key selection criteria include its 3.0 mm × 3.0 mm VSSOP-8 package, open-drain O.S. output with configurable fault queue (1–6 conversions), comparator/interrupt mode selection, and built-in low-pass filtering on SDA/SCL lines unique to the LM75B variant.

Technical Context

The LM75BIMM-3/NOPB 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 internal low-pass filters on both SDA and SCL lines to suppress noise-induced communication errors - a distinguishing feature absent in the LM75C.

It supports two functional modes: comparator mode (O.S. deactivates automatically when temperature falls below THYST) and interrupt mode (O.S. remains latched until any register is read). The O.S. output is open-drain, programmable for active-high/active-low polarity, and includes a user-configurable fault queue (1–6 consecutive over-limit conversions) to prevent false triggering in electrically noisy environments.

Key Specifications

Pinout & Package

VSSOP-8 package (3.00 mm × 3.00 mm body size, 0.65 mm pitch), thermally enhanced for PCB-mounted thermal sensing applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM75CIMM-3/NOPB, LM75BIMM-3/NOPB adds critical noise resilience features without changing layout or firmware; versus STTS751-DR, it trades resolution for deterministic, hardware-based thermal shutdown - essential for safety-critical power systems.

Availability

LM75BIMM-3/NOPB is available at Aetrix Electronics and suitable for server power supplies, industrial PLCs, telecom base stations, and medical imaging power modules requiring stable component supply and long-term lifecycle support.

Supply support for LM75BIMM-3/NOPB 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 company specializing in analog and embedded processing technologies, with leadership in precision sensing, power management, and industrial interface solutions.

The LM75BIMM-3/NOPB belongs to TI's industry-standard digital temperature sensor family, designed specifically for autonomous thermal monitoring in space-constrained, noise-prone systems where reliability and minimal external components are critical.

FAQ

What is the default power-up behavior of the LM75BIMM-3/NOPB?

At power-up, the LM75BIMM-3/NOPB initializes in comparator mode with TOS = 80°C, THYST = 75°C, O.S. active low, pointer register set to Temperature Register (000), and shutdown disabled. These defaults allow immediate stand-alone thermostat operation without I²C initialization - a key feature enabling plug-and-play thermal protection in systems with delayed firmware startup.

Does the LM75BIMM-3/NOPB require external components for basic operation?

No, the LM75BIMM-3/NOPB requires no external components for core functionality. Only a 100 nF bypass capacitor on +VS is recommended for ADC stability, and an external pull-up resistor on O.S. (≤30 kΩ) is mandatory for open-drain operation. Unlike many competitors, it integrates the ADC, I²C interface, comparator, and fault logic - eliminating need for op-amps, references, or discrete logic.

How does the fault queue in the LM75BIMM-3/NOPB prevent false O.S. triggering?

The LM75BIMM-3/NOPB's fault queue requires 1–6 consecutive temperature readings above TOS before asserting O.S. This avoids spurious interrupts from transient noise or short thermal spikes - especially valuable in motor drives or switch-mode power supplies. The queue depth is set via bits D3–D4 in the Configuration Register and persists across power cycles, ensuring consistent noise rejection behavior.

Can the LM75BIMM-3/NOPB operate reliably on a 3.3 V supply?

Yes, the LM75BIMM-3/NOPB is fully specified and tested for operation at 3.3 V (denoted by "-3" suffix). Its supply range is 3 V to 5.5 V, and quiescent current, accuracy, and I²C timing all meet datasheet limits at 3.3 V. The -3 variant uses optimized internal biasing to maintain ±2°C accuracy from –25°C to 100°C without derating - making it ideal for modern low-voltage embedded systems.

What distinguishes the LM75BIMM-3/NOPB from the LM75CIMM-3/NOPB?

The LM75BIMM-3/NOPB includes two exclusive features not present in the LM75CIMM-3/NOPB: (1) integrated low-pass filters on SDA and SCL lines to suppress high-frequency noise, and (2) bus fault timeout that resets the I²C interface if SDA is held low beyond 75–325 ms. These enhance robustness in electrically noisy environments - critical for industrial and automotive applications where bus lockup must be self-recovering.