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Texas Instruments LM75CIM-5/NOPB
- Part No.:
- LM75CIM-5/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM75CIM-5/NOPB.pdf
- Description:
- SENSOR DIGITAL -55C-125C 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,336
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Product details
Overview
LM75CIM-5/NOPB from Texas Instruments (formerly National Semiconductor) is a digital temperature sensor and thermal watchdog IC with integrated Sigma-Delta ADC and I²C interface. It delivers 9-bit temperature readings with ±2°C accuracy from −25°C to +100°C, ±3°C from −55°C to +125°C, operates from 3.0V to 5.5V, and features programmable overtemperature shutdown (O.S.) output with fault-tolerant hysteresis - used in PC thermal monitoring, base station environmental control, and industrial embedded systems.
For engineers reviewing the LM75CIM-5/NOPB datasheet, LM75CIM-5/NOPB pinout, LM75CIM-5/NOPB application, or LM75CIM-5/NOPB equivalent, this page provides verified functional identity, validated SOP-8 package mapping, confirmed I²C timing compliance up to 400 kHz, real-world thermal watchdog behavior, and design-meaningful parameter context for system-level thermal management integration.
Technical Context
The LM75CIM-5/NOPB implements a band-gap temperature sensor core paired with a 9-bit Sigma-Delta ADC, delivering temperature data in two's complement format where 1 LSB = 0.5°C. Its internal digital comparator continuously evaluates readings against user-programmable TOS (default 80°C) and THYST (default 75°C) thresholds to drive the open-drain O.S. output in either comparator or interrupt mode.
It operates as an I²C slave device with a fixed 7-bit address prefix "1001" and three user-configurable address bits (A2–A0), enabling up to eight devices on one bus. Unlike LM75A/B variants, LM75C lacks integrated SDA/SCL low-pass filters and bus timeout functionality - making external noise mitigation essential in electrically noisy environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3.0V to 5.5V - compatible with standard 3.3V and 5V logic rails; no level-shifting required in most host systems. |
| Temperature Accuracy | ±2°C max from −25°C to +100°C - sufficient for fan control and system throttling without calibration. |
| Resolution | 9-bit (0.5°C LSB) - enables precise threshold setting for thermal event detection and hysteresis tuning. |
| Quiescent Current | 250 μA typical operating / 4 μA typical shutdown - supports low-power thermal monitoring in battery-backed or always-on subsystems. |
| I²C Bus Speed | Up to 400 kHz - meets Fast-mode I²C specification, allowing rapid polling without bus congestion. |
| O.S. Output Type | Open-drain with 10 mA sink capability - directly interfaces with microcontroller interrupt pins or MOSFET gate drivers using external pull-up. |
| Fault Queue Depth | Programmable 1/2/4/6 consecutive faults - prevents false O.S. activation in EMI-prone industrial environments. |
Pinout & Package
LM75CIM-5/NOPB is housed in an SOP-8 (SOIC-8) package per JEDEC MS-012, NS Package Number M08A, with 1.27 mm pitch and gull-wing leads. Thermal resistance θJA is 200°C/W when mounted on a standard 2 oz copper PCB.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SDA (Pin 1) | I²C bidirectional data line | Open-drain interface requiring external pull-up; must be isolated from noise sources to maintain communication integrity. |
| SCL (Pin 2) | I²C clock input | Asynchronous master-driven clock; no internal filtering - layout must minimize crosstalk and ringing. |
| O.S. (Pin 3) | Overtemperature shutdown output | Active-low open-drain signal; drives MCU interrupts or power-control FETs; polarity programmable via config register. |
| GND (Pin 4) | Power supply ground | Primary thermal path for die-to-PCB conduction; must connect to solid ground plane for accurate ambient measurement. |
| A2 (Pin 5) | I²C address bit 2 | Configures device address LSB; tied high/low to select among eight possible addresses on shared bus. |
| A1 (Pin 6) | I²C address bit 1 | Part of 3-bit hardware address; enables multi-sensor thermal mapping without software address conflicts. |
| A0 (Pin 7) | I²C address bit 0 | Final address bit; combined with A2/A1, defines unique 7-bit slave address (1001xxx). |
| +VS (Pin 8) | Positive supply voltage | 3.0V–5.5V input; requires local 100 nF ceramic + 10 µF bulk decoupling near pin for stable ADC operation. |
Key Features
| Feature | Design Value |
|---|---|
| Stand-alone thermostat operation | Power-up defaults (TOS=80°C, THYST=75°C, comparator mode) enable immediate thermal protection without host firmware initialization. |
| Programmable fault queue | Configurable 1–6 consecutive over-limit conversions before O.S. assertion - eliminates spurious trips caused by transient noise or measurement jitter. |
| Shutdown mode | Reduces current to 4 μA at 3V, preserving battery life in portable or maintenance-mode thermal monitors while retaining register accessibility. |
| Two operating modes | Comparator mode (self-resetting O.S.) and interrupt mode (latched O.S. until register read) support both autonomous and host-coordinated thermal response strategies. |
| UL recognition | LM75CIM-5/NOPB is UL Recognized Component (E151256), satisfying safety requirements for end-equipment thermal cutoff circuits. |
Applications
| Server Rack Thermal Monitoring | Industrial PLC Cabinet Control |
|---|---|
|
Use Scenario: Real-time temperature tracking across CPU, memory, and power supply zones in 19″ rack-mounted servers. IC Role / Device Role / Timing Role: Primary thermal watchdog providing I²C-accessible die temperature and programmable O.S. interrupt for fan speed modulation and emergency shutdown. Use Value: Enables deterministic thermal response within 300 ms conversion time and ±2°C accuracy - critical for preventing thermal runaway during sustained compute loads. |
Use Scenario: Ambient temperature supervision inside sealed programmable logic controller enclosures exposed to factory-floor heat gradients. IC Role / Device Role / Timing Role: Stand-alone thermostat triggering forced-air cooling or alarm relays when cabinet temperature exceeds safe operational limits. Use Value: Fault-queue programming (e.g., 4-consecutive-fault threshold) rejects short-term spikes from welding equipment EMI, ensuring reliable long-term operation. |
| Desktop PC Power Supply Safety | Telecom Base Station Environmental Sensing |
|
Use Scenario: Overtemperature protection circuitry in ATX-compliant switching power supplies to prevent component failure under overload conditions. IC Role / Device Role / Timing Role: Dedicated thermal cutoff sensor interfacing directly with PSU supervisor IC or discrete MOSFET gate driver via O.S. output. Use Value: Open-drain O.S. output sinks 10 mA - sufficient to drive logic-level MOSFETs without buffering, reducing BOM count and board space. |
Use Scenario: Distributed temperature sensing across RF amplifier modules and backhaul interface cards in outdoor macrocell base stations. IC Role / Device Role / Timing Role: I²C-connected node in multi-drop thermal network, reporting localized hotspots to centralized controller for adaptive cooling scheduling. Use Value: 3.0V–5.5V supply range ensures compatibility with diverse 3.3V/5V subsystem rails; SOP-8 package supports automated assembly in high-volume telecom hardware. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital temperature sensor and thermal watchdog applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM75BIM-5/NOPB | Includes integrated SDA/SCL low-pass filters and bus timeout reset; otherwise identical electrical specs and pinout. | Better suited for electrically noisy environments (e.g., motor drives, switch-mode power supplies) where LM75CIM-5/NOPB may experience I²C lockup. | Select LM75BIM-5/NOPB when robustness against EMI-induced bus hangs is required; same SOP-8 footprint allows drop-in replacement if layout accommodates filter benefits. |
| STLM75DT-TR | Same 9-bit resolution, ±2°C accuracy, and I²C interface; differs in default TOS/THYST (85°C/75°C), lower shutdown current (1 μA), and SO-8 package with different marking. | Preferred in cost-sensitive consumer electronics where ultra-low standby power is prioritized over legacy LM75 register compatibility. | Choose STLM75DT-TR only after verifying register map alignment and confirming that 1 μA shutdown current justifies revalidation effort; not pin-compatible due to differing pin 3 function (NC vs O.S.). |
Compared with LM75CIM-5/NOPB, LM75BIM-5/NOPB adds noise immunity features without changing pinout or software interface, while STLM75DT-TR offers lower quiescent current but requires firmware adaptation and has non-identical pin functionality - making LM75BIM-5/NOPB the more seamless alternative for reliability-critical upgrades.
Availability
LM75CIM-5/NOPB is available at Aetrix Electronics and suitable for server thermal management, industrial PLC cabinet control, and telecom base station environmental sensing requiring stable component supply, long-lifecycle availability, and traceable sourcing.
Supply support for LM75CIM-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 acquired National Semiconductor in 2011 and maintains full technical and supply-chain stewardship of the LM75 family. TI is a global semiconductor leader focused on analog and embedded processing technologies.
The LM75 series was designed specifically for embedded thermal monitoring applications requiring simple I²C integration, autonomous watchdog behavior, and industrial-grade temperature accuracy - targeting computing, communications, and industrial control markets.
FAQ
What is the supply voltage range for LM75CIM-5/NOPB?
The LM75CIM-5/NOPB operates from 3.0V to 5.5V DC. This range supports direct connection to common 3.3V and 5V system rails without regulation. Operation below 3.0V is not guaranteed; the device may power down or behave unpredictably. The "-5" suffix in LM75CIM-5/NOPB explicitly denotes 5V-rated version, distinct from the -3 variant optimized for 3.3V systems.
Does LM75CIM-5/NOPB include built-in noise filtering on its I²C lines?
No, LM75CIM-5/NOPB does not include integrated low-pass filters on SDA or SCL lines. That feature is present only in LM75A and LM75B variants. For reliable operation, LM75CIM-5/NOPB requires careful PCB layout - including series 5 kΩ resistors near SCL/SDA pins and routing away from noise sources - to prevent communication errors from overshoot, undershoot, or high-frequency coupling.
How does the O.S. output behave in comparator versus interrupt mode on LM75CIM-5/NOPB?
In comparator mode, the O.S. output of LM75CIM-5/NOPB goes active when temperature exceeds TOS and deactivates only after dropping below THYST. In interrupt mode, O.S. activates at TOS and remains latched until any register is read via I²C or shutdown mode is entered. Both modes use the same open-drain output structure and are configured via the Configuration register's D1 bit.
What is the temperature resolution and data format of LM75CIM-5/NOPB?
LM75CIM-5/NOPB provides 9-bit temperature data in two's complement format, with 1 LSB = 0.5°C. The Temperature Register outputs values ranging from 192h (−55°C) to 0FAh (+125°C). Data is read as a 16-bit word, but only bits D15–D7 contain valid temperature information; D6–D0 are undefined. This resolution enables precise threshold setting for thermal events without floating-point math.
Can LM75CIM-5/NOPB operate as a standalone thermostat without an I²C host controller?
Yes, LM75CIM-5/NOPB powers up in comparator mode with default TOS = 80°C and THYST = 75°C, enabling immediate thermostat operation. With A0–A2 grounded and SDA/SCL pulled up via 10 kΩ resistors, the O.S. output autonomously switches based on die temperature - ideal for fan control or emergency shutdown circuits where microcontroller resources are constrained or unavailable.
LM75CIM-5/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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
LM75CIM-5/NOPB FAQ
1.How can I place an order for LM75CIM-5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM75CIM-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 LM75CIM-5/NOPB reliable?
The price and inventory of LM75CIM-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 LM75CIM-5/NOPB is usually 5 days.
3.What payment methods are accepted for LM75CIM-5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM75CIM-5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM75CIM-5/NOPB?
LM75CIM-5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM75CIM-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 LM75CIM-5/NOPB?
For technical support, including LM75CIM-5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM75CIM-5/NOPB requirements.
6.How does Aetrix verify that LM75CIM-5/NOPB is sourced from the original manufacturer or authorized distributors?
All LM75CIM-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 LM75CIM-5/NOPB meets industry standards.
7.What is the process for return or replacement of LM75CIM-5/NOPB?
All LM75CIM-5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM75CIM-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 LM75CIM-5/NOPB part is unused and in its original packaging.
Return procedure for LM75CIM-5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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