Texas Instruments LM75BIM-5/NOPB

Overview

LM75BIM-5/NOPB 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, consumes only 4 μA in shutdown mode, and supports up to eight devices on one bus-used for real-time thermal monitoring in server power supplies and embedded controllers.

For engineers reviewing the LM75BIM-5/NOPB datasheet, LM75BIM-5/NOPB pinout, LM75BIM-5/NOPB application, or LM75BIM-5/NOPB equivalent, key selection criteria 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 management layouts.

Technical Context

The LM75BIM-5/NOPB implements a silicon bandgap temperature sensor feeding a 9-bit sigma-delta ADC, with conversion time fixed at 100 ms and register-based configuration via I²C. Its functional block includes a pointer-controlled register map (Temperature, TOS, THYST, Configuration), two's-complement temperature data format (LSB = 0.5°C), and dual-mode O.S. output (comparator or interrupt).

Unlike the LM75C, the LM75BIM-5/NOPB adds integrated low-pass filtering on SDA/SCL lines for noise immunity and a bus fault timeout feature (tTIMEOUT = 75–325 ms) that resets the I²C interface if SDA is held low too long-both active only outside shutdown mode and absent in the LM75C variant.

Key Specifications

Pinout & Package

LM75BIM-5/NOPB is housed in an 8-pin SOIC package (4.90 mm × 3.91 mm), surface-mount compatible with standard reflow profiles and IPC-7351B land patterns.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM75CIM-5/NOPB and STLM75M2TR, the LM75BIM-5/NOPB uniquely combines bus fault recovery, programmable fault tolerance, and analog input filtering-making it the only option among the three suitable for thermally critical, electrically noisy infrastructure equipment where I²C reliability cannot be compromised.

Availability

LM75BIM-5/NOPB is available at Aetrix Electronics and suitable for server thermal management, industrial PLC guarding, and network switch power supply monitoring requiring stable component supply across multi-year production cycles.

Supply support for LM75BIM-5/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 leader specializing in analog, embedded processing, and connectivity technologies, with decades of heritage in precision sensing and industrial-grade IC design.

The LM75BIM-5/NOPB belongs to TI's precision analog temperature sensor product line, engineered specifically for thermal protection and monitoring in infrastructure, computing, and industrial automation systems where reliability and noise immunity are non-negotiable.

FAQ

What is the default power-up behavior of the LM75BIM-5/NOPB?

At power-on, the LM75BIM-5/NOPB initializes in comparator mode with TOS = 80°C, THYST = 75°C, O.S. active-low, and pointer register set to the Temperature register. This allows immediate stand-alone thermostat operation without I²C initialization-ideal for systems where firmware may not initialize sensors early in boot.

How does the LM75BIM-5/NOPB differ from the LM75CIM-5/NOPB in noise-prone environments?

The LM75BIM-5/NOPB includes integrated low-pass filters on both SDA and SCL lines and a bus fault timeout feature (75–325 ms), which reset the I²C interface if SDA is held low too long. These features are absent in the LM75CIM-5/NOPB, making the LM75BIM-5/NOPB significantly more robust in electrically noisy settings like motor drives or switch-mode power supplies.

Can the LM75BIM-5/NOPB operate from a 3.3 V supply?

Yes, the LM75BIM-5/NOPB operates across 3 V to 5.5 V. At 3.3 V, its quiescent current remains 280 μA (typical) in active mode and 4 μA (typical) in shutdown mode. Accuracy degrades ~1°C/V from nominal supply, so ±2°C spec holds at 3.3 V with minor derating-verified in TI's characterization data for LM75BIM-3 variants.

What is the function of the A0, A1, and A2 pins on the LM75BIM-5/NOPB?

A0–A2 are hardware-configurable I²C address bits that set the three LSBs of the 7-bit slave address (MSBs are hardwired as 1001). By tying each pin to GND (0) or +VS (1), users select one of eight unique addresses (1001000 to 1001111), enabling up to eight LM75BIM-5/NOPB sensors on a single I²C bus without address conflicts.

Is the O.S. output of the LM75BIM-5/NOPB compatible with 5 V logic systems?

Yes-the O.S. pin is open-drain and rated for 6.5 V absolute maximum. When used with a 5 V pull-up resistor (≤30 kΩ per TI spec), it safely drives 5 V-tolerant microcontroller interrupt inputs. The output saturation voltage is ≤0.8 V at 4 mA sink current, ensuring clean logic-low recognition across voltage domains.