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Texas Instruments LM75BIMMX-5/NOPB
- Part No.:
- LM75BIMMX-5/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LM75BIMMX-5/NOPB.pdf
- Description:
- SENSOR DIGITAL -55C-125C 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,266
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Product details
Overview
LM75BIMMX-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 I²C bus - used in PC motherboard thermal monitoring, base station power management, and embedded system safety shutdown circuits.
For engineers reviewing the LM75BIMMX-5/NOPB datasheet, LM75BIMMX-5/NOPB pinout, LM75BIMMX-5/NOPB application, or LM75BIMMX-5/NOPB equivalent, key selection considerations include its programmable fault queue (1–6 conversions), dual O.S. modes (comparator/interrupt), power-up default thermostat behavior, and SOIC-8 package compatibility with industrial thermal sensing layouts.
Technical Context
The LM75BIMMX-5/NOPB implements a silicon bandgap temperature sensor feeding a 9-bit sigma-delta ADC, with decimation filtering and two's complement output format (LSB = 0.5°C). Its I²C slave interface uses a fixed 4-bit prefix (1001) plus three address bits (A2–A0), enabling up to eight devices per bus at up to 400 kHz clock rate.
It features dual operating modes: comparator mode (O.S. toggles between TOS and THYST) and interrupt mode (O.S. latches until register read or shutdown). The O.S. output is open-drain, programmable for active-high/low polarity, and includes fault tolerance via configurable consecutive-overlimit detection (1–6 faults).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Temperature Accuracy | ±2°C max over –25°C to 100°C; enables reliable thermal trip point setting without calibration in consumer/industrial systems |
| Supply Voltage Range | 3 V to 5.5 V; compatible with both 3.3 V and 5 V logic domains without level-shifting |
| Active Supply Current | 280 µA typical; allows continuous monitoring in low-power embedded applications without significant system load |
| Shutdown Current | 4 µA typical at 3 V; reduces idle power by >98% while retaining I²C accessibility and register state |
| Output Resolution | 9-bit two's complement (0.5°C LSB); provides sufficient granularity for fan control, throttling, and alarm thresholds |
| I²C Clock Rate | Up to 400 kHz; supports fast polling intervals (e.g., <300 ms conversion time) in real-time thermal response loops |
| Fault Queue Depth | Programmable 1–6 consecutive over-limit readings; prevents false O.S. activation in electrically noisy environments |
Pinout & Package
LM75BIMMX-5/NOPB is housed in an 8-pin SOIC (Small Outline Integrated Circuit) package measuring 4.90 mm × 3.91 mm, with standard gull-wing leads and surface-mount footprint. Thermal resistance RθJA is 115.2°C/W under JEDEC JESD51-2 conditions.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +VS | Positive supply input | Accepts 3–5.5 V DC; requires local 100 nF bypass capacitor near pin for noise immunity and stable ADC reference |
| A0, A1, A2 | I²C address inputs | Set device address bits (LSBs); grounded or pulled high to +VS to configure one of eight unique 7-bit slave addresses (1001xxx) |
| SCL | I²C clock input | Input-only, open-drain compatible; requires external pull-up resistor; defines timing for all serial transfers |
| SDA | I²C bidirectional data line | Open-drain, shared bus line; requires external pull-up; carries address, command, and temperature data |
| O.S. | Over-temperature shutdown output | Open-drain interrupt/fault signal; active-low by default; must be externally pulled up to trigger MCU GPIO or fan controller |
| GND | Power ground reference | Primary return path for supply and internal analog/digital circuitry; must connect to clean system ground plane |
Key Features
| Feature | Design Value |
|---|---|
| Integrated sigma-delta ADC + bandgap sensor | Delivers factory-calibrated 9-bit temperature data without external components or trimming |
| Programmable O.S. fault tolerance | Configurable 1–6 consecutive over-limit conversions prevent spurious shutdowns in EMI-heavy environments |
| Two-wire (I²C) interface with 400 kHz support | Enables daisy-chaining up to eight sensors on one bus, reducing MCU GPIO and PCB routing overhead |
| Power-up default thermostat operation | Automatically functions as standalone thermal switch (TOS=80°C, THYST=75°C) if I²C lines are unconnected |
| UL recognition (LM75B) | Meets UL 1577 component safety requirements for isolation-critical industrial and telecom applications |
Applications
| Server CPU Thermal Monitoring | Industrial PLC Temperature Safety |
|---|---|
Use Scenario: Real-time die temperature tracking of multi-core x86 processors to prevent thermal throttling or catastrophic failure. IC Role / Device Role / Timing Role: Primary temperature sensor feeding host BMC or EC via I²C; O.S. directly drives hardware reset or fan PWM controller. Use Value: ±2°C accuracy ensures precise trip-point alignment with Intel/AMD thermal specifications; 280 µA quiescent current avoids adding measurable load to VRM monitoring rails. |
Use Scenario: Over-temperature protection for motor drive inverters in programmable logic controllers deployed in factory automation cabinets. IC Role / Device Role / Timing Role: Standalone thermal watchdog using power-up defaults; O.S. output wired to safety relay input to cut power on sustained overtemp. Use Value: No firmware dependency required; fault queue prevents nuisance trips from transient spikes during switching transients; UL recognition satisfies IEC 61508 functional safety prerequisites. |
| Telecom Base Station Power Amplifier | Network Switch ASIC Thermal Management |
Use Scenario: Monitoring GaN FET junction temperature in 5G macrocell RF power amplifiers to maintain linear operation and prevent derating. IC Role / Device Role / Timing Role: Local sensor mounted adjacent to PA module; I²C reads temperature every 250 ms; O.S. triggers bias current reduction when threshold exceeded. Use Value: 400 kHz I²C speed enables rapid polling without bus contention; 115.2°C/W RθJA allows accurate board-level thermal modeling for layout validation. |
Use Scenario: Thermal supervision of high-density Ethernet switch ASICs where localized hot spots require independent zone monitoring. IC Role / Device Role / Timing Role: One LM75BIMMX-5/NOPB per ASIC quadrant; configured in interrupt mode to assert O.S. until host driver acknowledges and logs event. Use Value: Latching interrupt behavior guarantees no thermal fault is missed during OS scheduling latency; SOIC-8 footprint fits tight BGA escape routing zones. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital temperature sensor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM75CIMMX-5/NOPB | Lower ESD rating (HBM ±1500 V vs. ±2500 V); identical pinout, registers, and electrical specs otherwise | Lacks UL recognition; suitable for non-safety-critical commercial equipment with lower noise immunity requirements | Select LM75CIMMX-5/NOPB only when cost sensitivity outweighs need for enhanced robustness and safety certification |
| STLM75DT | Same 9-bit resolution and I²C interface but ±3°C accuracy over full –55°C to 125°C range; no fault queue programming | Fixed 2-fault hysteresis; lacks programmable O.S. polarity and comparator/interrupt mode selection | Choose STLM75DT only for legacy drop-in replacement where firmware does not use advanced LM75B features |
Compared with LM75CIMMX-5/NOPB, the LM75BIMMX-5/NOPB adds UL recognition and higher ESD immunity critical for telecom infrastructure; versus STLM75DT, it offers superior accuracy in the –25°C to 100°C range and flexible fault handling essential for mission-critical thermal shutdown.
Availability
LM75BIMMX-5/NOPB is available at Aetrix Electronics and suitable for server thermal management, industrial PLC safety systems, telecom base station power amplifiers, and network switch ASIC monitoring requiring stable component supply across long production lifecycles.
Supply support for LM75BIMMX-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 leadership in precision sensing and industrial-grade IC design.
The LM75B belongs to TI's precision analog temperature sensor product line, engineered specifically for reliable thermal monitoring and autonomous over-temperature protection in safety-aware systems such as communications infrastructure and industrial control.
FAQ
What is the default O.S. output behavior of the LM75BIMMX-5/NOPB at power-up?
At power-up, the LM75BIMMX-5/NOPB defaults to comparator mode with O.S. active low, TOS = 80°C, THYST = 75°C, and pointer register set to the temperature register. This allows immediate stand-alone thermostat operation without I²C initialization - a key feature for fail-safe thermal protection in systems where firmware may not yet be running. The LM75BIMMX-5/NOPB retains this behavior unless reconfigured via I²C.
Does the LM75BIMMX-5/NOPB require external passive components for basic operation?
No, the LM75BIMMX-5/NOPB requires no external passive components for core temperature sensing functionality. Only a 100 nF bypass capacitor on +VS (recommended near the pin) and external pull-up resistors on SDA/SCL/O.S. lines are needed for reliable I²C communication and interrupt signaling. The internal bandgap sensor, sigma-delta ADC, and register logic are fully integrated - eliminating calibration parts, op-amps, or discrete comparators required by analog alternatives.
How does the fault queue feature in the LM75BIMMX-5/NOPB improve system reliability?
The LM75BIMMX-5/NOPB's programmable fault queue (1–6 consecutive over-limit readings) prevents false O.S. activation caused by transient thermal noise or electrical interference. For example, configuring 4 faults means the O.S. output only asserts after four successive temperature conversions exceed TOS, significantly increasing noise immunity in motor drives or RF power stages. This behavior is confirmed in the LM75BIMMX-5/NOPB datasheet Section 7.5.4 and directly enhances field reliability without firmware intervention.
Can the LM75BIMMX-5/NOPB operate in both comparator and interrupt modes, and how do they differ?
Yes, the LM75BIMMX-5/NOPB supports both modes via the Configuration Register bit D1. In comparator mode, O.S. de-asserts automatically when temperature falls below THYST. In interrupt mode, O.S. remains asserted until any register is read or shutdown is entered - ensuring no thermal event goes unlogged. This distinction is critical for applications like data center BMCs, where latched interrupts guarantee fault capture even during OS delays. Both modes are fully supported in the LM75BIMMX-5/NOPB.
Is the LM75BIMMX-5/NOPB pin-compatible with other LM75 variants such as the LM75CIMMX-5/NOPB?
Yes, the LM75BIMMX-5/NOPB is pin-compatible and functionally interoperable with the LM75CIMMX-5/NOPB in SOIC-8 packaging - sharing identical pinout, register map, I²C protocol, and electrical interface characteristics. The primary differences are the LM75BIMMX-5/NOPB's higher ESD rating (±2500 V HBM), UL recognition, integrated SDA/SCL low-pass filters, and bus fault timeout feature - all implemented without altering pin assignment or mechanical footprint.
LM75BIMMX-5/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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-VSSOP
LM75BIMMX-5/NOPB FAQ
1.How can I place an order for LM75BIMMX-5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM75BIMMX-5/NOPB 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 LM75BIMMX-5/NOPB reliable?
The price and inventory of LM75BIMMX-5/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM75BIMMX-5/NOPB is usually 5 days.
3.What payment methods are accepted for LM75BIMMX-5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM75BIMMX-5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM75BIMMX-5/NOPB?
LM75BIMMX-5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM75BIMMX-5/NOPB 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 LM75BIMMX-5/NOPB?
For technical support, including LM75BIMMX-5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM75BIMMX-5/NOPB requirements.
6.How does Aetrix verify that LM75BIMMX-5/NOPB is sourced from the original manufacturer or authorized distributors?
All LM75BIMMX-5/NOPB 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 LM75BIMMX-5/NOPB meets industry standards.
7.What is the process for return or replacement of LM75BIMMX-5/NOPB?
All LM75BIMMX-5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM75BIMMX-5/NOPB, 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 LM75BIMMX-5/NOPB part is unused and in its original packaging.
Return procedure for LM75BIMMX-5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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