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Texas Instruments LM75BIM-3
- Part No.:
- LM75BIM-3
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM75BIM-3.pdf
- Description:
- SENSOR DIGITAL -55C-125C 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,345
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Product details
Overview
LM75BIM-3 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 at 3.3 V supply, supports up to eight devices on one bus via A0–A2 address pins, and operates in comparator or interrupt mode - used for real-time thermal monitoring in embedded power supplies and industrial controllers.
For engineers reviewing the LM75BIM-3 datasheet, LM75BIM-3 pinout, LM75BIM-3 application, or LM75BIM-3 equivalent, key selection considerations include its 3.3 V nominal operation, open-drain O.S. output with fault-queue programmability (1–6 consecutive faults), shutdown current of 4 μA, and SOIC-8 package compatibility with legacy thermal management layouts.
Technical Context
The LM75BIM-3 implements a silicon bandgap temperature sensor feeding a 9-bit sigma-delta ADC with 0.5°C LSB resolution. Its I²C interface operates up to 400 kHz with built-in low-pass filtering on SDA/SCL lines - a distinguishing feature of the LM75B variant that enhances noise immunity in electrically noisy environments like motor drives or power converters.
It features dual operating modes: comparator mode (O.S. toggles between TOS and THYST thresholds) and interrupt mode (O.S. latches until register read or shutdown). The fault queue (1–6 conversions) and programmable O.S. polarity (active-low default) are configured via the 8-bit Configuration Register, while temperature data is read from a dedicated 16-bit Temperature Register in two's complement format.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3.0 V to 5.5 V; LM75BIM-3 is characterized at +VS = 3.3 Vdc - ensures stable operation in 3.3 V system rails without level-shifting. |
| Temperature Accuracy | ±2°C max from –25°C to 100°C; ±3°C max from –55°C to 125°C - enables reliable thermal trip decisions in industrial ambient ranges. |
| Resolution | 9-bit (0.5°C LSB); full-scale range –55°C to +125°C - provides sufficient granularity for fan control and overtemp warning thresholds. |
| Quiescent Current | 280 μA typical active; 4 μA typical shutdown - allows battery-backed or ultra-low-power thermal supervision in standby systems. |
| I²C Interface Speed | Up to 400 kHz standard/fast-mode; includes internal SDA/SCL low-pass filters - reduces susceptibility to EMI-induced bus glitches in motor-control or SMPS applications. |
| O.S. Output Type | Open-drain, active-low by default; programmable polarity and fault tolerance (1–6 consecutive over-limit readings) - supports direct connection to MCU interrupt pins or discrete logic without external inverters. |
| Address Pins | A0, A1, A2 - enable up to eight LM75BIM-3 units on a single I²C bus, simplifying multi-zone thermal monitoring in server backplanes or PLC I/O modules. |
Pinout & Package
LM75BIM-3 is housed in an 8-pin SOIC (D package), body size 4.90 mm × 3.91 mm, with standard JEDEC MS-012AC footprint and gull-wing leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SDA | I²C bidirectional data line | Open-drain, requires external pull-up; supports multi-master arbitration and clock stretching - connects directly to microcontroller I²C port without buffering. |
| 2 - SCL | I²C clock input | Input-only, edge-triggered; internal low-pass filter improves noise rejection in high-dV/dt environments like DC-DC converter boards. |
| 3 - O.S. | Over-temperature shutdown output | Open-drain, active-low default; sinks up to 4 mA; must be pulled up externally - interfaces natively with GPIO interrupt inputs or optocoupler bases. |
| 4 - GND | Analog/digital ground reference | Single ground pin; requires low-impedance connection to PCB ground plane to minimize thermal measurement error from self-heating. |
| 5 - A2 | I²C slave address bit 2 | Logic-level input (0 = GND, 1 = +VS); sets MSB of 3-bit hardware address - enables unique addressing when multiple LM75BIM-3 sensors share one bus. |
| 6 - A1 | I²C slave address bit 1 | Same function as A2; combined with A0/A2, defines full 7-bit I²C address (1001xxx) - eliminates need for software-configured addresses in fixed-hardware designs. |
| 7 - A0 | I²C slave address bit 0 | LSB of hardware address; all three pins tied low yield base address 0x48 - simplifies initialization in systems with single-sensor deployment. |
| 8 - +VS | Positive supply voltage | 3.0–5.5 V input; requires 100 nF ceramic bypass capacitor placed adjacent to pin - stabilizes internal regulator and ADC reference during conversion bursts. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated sigma-delta ADC + bandgap sensor | Delivers factory-calibrated 9-bit temperature data without external components - eliminates BOM cost and layout area for signal conditioning circuitry. |
| Programmable fault queue (1–6) | Prevents false O.S. activation from transient noise spikes - critical for reliable operation near switching regulators or brushed motors. |
| Bus fault timeout (LM75B only) | Resets SDA to high-impedance if held low >75 ms (LM75BIM-3) - recovers I²C bus lockup without host intervention in unattended systems. |
| Power-up defaults | Comparator mode, TOS = 80°C, THYST = 75°C, O.S. active-low - enables immediate stand-alone thermostat behavior without firmware initialization. |
| UL recognition (LM75B) | Meets UL 60950-1 requirements - supports safety-certified designs in industrial equipment and telecom infrastructure without additional isolation components. |
Applications
| Server CPU Thermal Monitoring | Industrial PLC Module |
|---|---|
Use Scenario: Real-time die temperature tracking of multi-core processors in 1U rack servers, triggering dynamic frequency scaling or fan speed ramp-up before thermal throttling occurs. IC Role / Device Role / Timing Role: Primary thermal watchdog; reads temperature every 100–300 ms via I²C; asserts O.S. to BMC interrupt line upon crossing 80°C threshold. Use Value: Prevents sustained CPU overheating using factory-trimmed ±2°C accuracy across –25°C to 100°C - avoids costly thermal derating or forced air redesign. | Use Scenario: Ambient temperature supervision inside DIN-rail mounted programmable logic controller cabinets exposed to variable factory floor conditions. IC Role / Device Role / Timing Role: Standalone comparator-mode sensor; uses power-up defaults (TOS=80°C, THYST=75°C) to drive relay-controlled cabinet cooling fans without host processor involvement. Use Value: Enables fail-safe thermal protection even during PLC firmware boot or communication loss - leverages UL-recognized reliability for industrial safety compliance. |
| Telecom Power Shelf | Medical Diagnostic Equipment |
Use Scenario: Hot-spot monitoring of DC-DC converter modules in distributed telecom power systems where EMI from high-frequency switching threatens I²C integrity. IC Role / Device Role / Timing Role: Noise-immune temperature node; utilizes LM75B's internal SDA/SCL low-pass filters and programmable fault queue to suppress false trips caused by conducted RF interference. Use Value: Maintains accurate thermal response despite 400 kHz I²C operation in 100+ V/μs dV/dt environments - eliminates need for external ferrite beads or shielded cabling. | Use Scenario: Patient-side thermal validation in portable ultrasound or MRI gradient coil driver units requiring precise temperature stability for image fidelity. IC Role / Device Role / Timing Role: High-reliability sensor in shutdown-critical path; configured in interrupt mode to latch O.S. until host confirms safe thermal state - prevents unintended system reset during imaging sequences. Use Value: Guarantees deterministic thermal fault handling with 4 μA shutdown current - extends battery life in mobile diagnostic platforms without compromising safety margins. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital temperature sensor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM75CIM-3 | No internal SDA/SCL low-pass filters; no bus fault timeout; lower HBM ESD rating (±1500 V vs. ±2500 V) | Lacks noise immunity features needed in high-EMI power electronics; suitable only for benign board-level environments | Select LM75CIM-3 only when cost sensitivity outweighs EMI robustness requirements and system-level filtering is already present. |
| STLM75CDT-3 | Same 9-bit resolution and I²C interface; ±2°C accuracy over –25°C to 100°C; but no UL recognition and higher 350 μA active current | Not certified for safety-critical industrial use; less suitable for long-duration battery-powered deployments due to higher quiescent draw | Choose STLM75CDT-3 only for non-safety-certified consumer applications where TI's UL listing is not required. |
Compared with LM75CIM-3 and STLM75CDT-3, the LM75BIM-3 uniquely combines UL recognition, superior ESD tolerance, and hardware-level noise suppression - making it the only option qualified for thermally constrained, safety-compliant industrial and telecom infrastructure designs.
Availability
LM75BIM-3 is available at Aetrix Electronics and suitable for industrial PLC modules, telecom power shelves, medical diagnostic equipment, and server thermal management systems requiring stable component supply across extended product lifecycles.
Supply support for LM75BIM-3 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 expertise in precision sensing and industrial-grade IC design.
The LM75BIM-3 belongs to TI's LM75x family of digital temperature sensors engineered specifically for reliable thermal monitoring in harsh electrical environments - emphasizing noise immunity, safety certification, and drop-in compatibility with legacy I²C thermal architectures.
FAQ
What is the supply voltage range for the LM75BIM-3, and how does it affect accuracy?
The LM75BIM-3 operates from 3.0 V to 5.5 V, with characterization performed at +VS = 3.3 Vdc per datasheet specifications. Accuracy degrades approximately 1°C/V away from nominal supply; thus, at 3.3 V, the device maintains its rated ±2°C max error from –25°C to 100°C. Deviations beyond ±0.3 V require recalibration or margining in safety-critical thermal designs.
Does the LM75BIM-3 require external components for basic operation?
No - the LM75BIM-3 requires only a 100 nF ceramic bypass capacitor on the +VS pin and external pull-up resistors on SDA and SCL lines. Its integrated sigma-delta ADC, bandgap sensor, and I²C interface eliminate need for external op-amps, references, or ADC drivers, enabling minimal-footprint thermal monitoring in space-constrained PCBs.
How does the fault queue feature work in the LM75BIM-3?
The LM75BIM-3's fault queue (programmable 1–6 consecutive over-limit readings) prevents false O.S. activation from transient noise. Each temperature conversion result is evaluated against TOS; only after the specified number of successive "over" results does O.S. assert. This is especially valuable near switching power supplies or motor drivers where short thermal spikes occur.
Can the LM75BIM-3 operate as a standalone thermostat without a microcontroller?
Yes - the LM75BIM-3 powers up in comparator mode with TOS = 80°C and THYST = 75°C, driving the O.S. output directly. With A0–A2 grounded and SDA/SCL pulled up, it functions autonomously as a hardware thermal cutoff, ideal for fan control or emergency shutdown circuits where firmware may be unavailable or unreliable.
What is the difference between LM75BIM-3 and LM75BIMM-3?
The LM75BIM-3 uses an 8-pin SOIC (D) package (4.90 mm × 3.91 mm), while LM75BIMM-3 uses an 8-pin VSSOP (DGK) package (3.00 mm × 3.00 mm). Both share identical electrical specifications, pinout, and functionality - the distinction is purely mechanical, with LM75BIMM-3 optimized for high-density layouts where board space is constrained.
LM75BIM-3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Last Time Buy
- Sensor Type:
- Digital, Local
- Sensing Temperature - Local:
- -55°C ~ 125°C
- Sensing Temperature - Remote:
- -
- Output Type:
- I2C
- Voltage - Supply:
- 3V ~ 5.5V
- Resolution:
- 9 b
- Features:
- Output Switch, Programmable Limit, Shutdown Mode
- Accuracy - Highest (Lowest):
- ±2°C (±3°C)
- Test Condition:
- -25°C ~ 100°C (-55°C ~ 125°C)
- Operating Temperature:
- -55°C ~ 125°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 8-SOIC
LM75BIM-3 FAQ
1.How can I place an order for LM75BIM-3 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM75BIM-3 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LM75BIM-3 reliable?
The price and inventory of LM75BIM-3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM75BIM-3 is usually 5 days.
3.What payment methods are accepted for LM75BIM-3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM75BIM-3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM75BIM-3?
LM75BIM-3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM75BIM-3 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LM75BIM-3?
For technical support, including LM75BIM-3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM75BIM-3 requirements.
6.How does Aetrix verify that LM75BIM-3 is sourced from the original manufacturer or authorized distributors?
All LM75BIM-3 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LM75BIM-3 meets industry standards.
7.What is the process for return or replacement of LM75BIM-3?
All LM75BIM-3 units undergo pre-shipment inspection (PSI). If there is an issue with LM75BIM-3, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LM75BIM-3 part is unused and in its original packaging.
Return procedure for LM75BIM-3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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