Texas Instruments LM75BIMM-5/NOPB

Overview

LM75BIMM-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, draws only 280 µA typical active current, 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 LM75BIMM-5/NOPB datasheet, LM75BIMM-5/NOPB pinout, LM75BIMM-5/NOPB application, or LM75BIMM-5/NOPB equivalent, key selection criteria include its open-drain O.S. interrupt behavior, fault-queue programmability (1–6 consecutive faults), power-up default thermostat mode (T_OS = 80°C, T_HYST = 75°C), and VSSOP-8 package compatibility with space-constrained PCB layouts.

Technical Context

The LM75BIMM-5/NOPB implements a silicon bandgap temperature sensor feeding a 9-bit sigma-delta ADC with 0.5°C LSB resolution. Its two-wire I²C interface supports standard (100 kHz) and fast-mode (400 kHz) operation, with address pins A2–A0 enabling up to eight slave addresses (1001xxx). The device includes dedicated comparator logic that evaluates temperature against user-programmable T_OS and T_HYST registers before asserting the open-drain O.S. output.

Unlike the LM75C, the LM75B variant integrates low-pass filters on SDA/SCL lines and a bus fault timeout feature (t_TIMEOUT = 75–325 ms) that resets the I²C state if SDA is held low too long-enhancing robustness in electrically noisy industrial environments. Shutdown mode reduces quiescent current to 4 µA while preserving register access and configuration retention.

Key Specifications

Pinout & Package

VSSOP-8 package (3.00 mm × 3.00 mm), thermally enhanced for PCB-mounted thermal sensing with low junction-to-board resistance (ψ_JB = 77.5°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM75CIMM-5/NOPB, the LM75BIMM-5/NOPB adds critical noise resilience features essential for industrial deployment; versus STTS751-DR, it trades resolution for deterministic hardware O.S. assertion-making it preferable for fail-safe thermal cutoffs where latency and reliability dominate.

Availability

LM75BIMM-5/NOPB is available at Aetrix Electronics and suitable for server power supplies, industrial PLCs, network switches, and medical imaging power modules requiring stable component supply across extended product lifecycles.

Supply support for LM75BIMM-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 delivering analog and embedded processing solutions, with over 50 years of innovation in precision sensing, power management, and interface technologies.

The LM75BIMM-5/NOPB belongs to TI's industry-standard digital temperature sensor family, designed specifically for reliable, low-cost thermal supervision in space-constrained, noise-prone electronic systems where hardware-triggered safety responses are mandatory.

FAQ

What is the default power-up behavior of the LM75BIMM-5/NOPB?

The LM75BIMM-5/NOPB powers up in comparator mode with T_OS = 80°C, T_HYST = 75°C, O.S. active low, pointer register set to Temperature Register (000), and shutdown disabled. This allows immediate stand-alone thermostat operation without I²C initialization-critical for systems where host firmware may not be ready at power-on. The LM75BIMM-5/NOPB retains these defaults unless modified via I²C write.

Can the LM75BIMM-5/NOPB operate on a 3.3 V supply?

Yes, the LM75BIMM-5/NOPB is fully specified for 3 V to 5.5 V operation. At 3.3 V, its typical active current remains 280 µA, shutdown current is 4 µA, and temperature accuracy holds at ±2°C from –25°C to 100°C. The I²C interface functions correctly with 3.3 V logic levels, and the internal voltage reference maintains stability-making the LM75BIMM-5/NOPB ideal for mixed-voltage embedded designs.

How does the fault queue in the LM75BIMM-5/NOPB prevent false O.S. triggering?

The LM75BIMM-5/NOPB's fault queue requires 1–6 consecutive temperature readings above T_OS before asserting O.S., configurable via bits D3–D4 of the Configuration Register. This avoids spurious interrupts caused by momentary noise or thermal transients. For example, setting "4 faults" means four full 100 ms conversions must exceed the limit-effectively adding ~400 ms hysteresis-while still allowing rapid response once sustained overtemperature is confirmed. The LM75BIMM-5/NOPB implements this entirely in hardware.

Is the O.S. output of the LM75BIMM-5/NOPB push-pull or open-drain?

The O.S. output of the LM75BIMM-5/NOPB is strictly open-drain, requiring an external pull-up resistor to +VS or another logic rail. It cannot source current. The LM75BIMM-5/NOPB specifies a maximum sink current of 4 mA and saturation voltage of 0.8 V at that load. Pull-up values between 4.7 kΩ and 30 kΩ are recommended-larger values reduce self-heating error but increase rise time; the LM75BIMM-5/NOPB's internal design accommodates either choice.

Does the LM75BIMM-5/NOPB support both comparator and interrupt modes?

Yes, the LM75BIMM-5/NOPB supports both modes via bit D1 of the Configuration Register. In comparator mode, O.S. deasserts automatically when temperature falls below T_HYST. In interrupt mode, O.S. stays asserted until any register is read via I²C-or the device enters shutdown. This dual-mode flexibility lets the LM75BIMM-5/NOPB serve as either a self-resetting thermal switch or a latched fault indicator, adapting to different system-level fault-handling architectures.