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Home > Products > Sensors, Transducers > Temperature Sensors > Analog and Digital Output

Texas Instruments LM74CIM-3/NOPB

Name: LM74CIM-3/NOPB
Brand: Texas Instruments
SKU: LM74CIM-3/NOPB
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LM74CIM-3/NOPB

Manufacturer:: Texas Instruments

Category:: Analog and Digital Output

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: LM74CIM-3/NOPB.pdf

Description:: SENSOR DIGITAL -55C-150C 8SOIC

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Product details

Overview

LM74CIM-3/NOPB from Texas Instruments is a 12-bit plus sign digital temperature sensor with SPI/MICROWIRE interface, 0.0625°C resolution, −55°C to +150°C operating range, and SOIC-8 package. It functions as a self-contained delta-sigma ADC-based thermal monitor for PCB-level temperature sensing in high-reliability industrial and computing systems.

For engineers reviewing the LM74CIM-3/NOPB datasheet, LM74CIM-3/NOPB pinout, LM74CIM-3/NOPB application, or LM74CIM-3/NOPB equivalent, this page delivers verified specifications, SOIC-8 terminal mapping, thermal accuracy across extended temperature ranges, shutdown current behavior, and real-world integration considerations for system thermal management designs.

Technical Context

The LM74CIM-3/NOPB integrates a band-gap temperature sensor with a 12-bit plus sign delta-sigma ADC, delivering two's complement output with LSB = 0.0625°C. Its SPI/MICROWIRE-compatible 3-wire serial interface operates with CS, SC, and bidirectional SI/O pins, supporting 32-clock full-duplex transactions.

It features a write-only configuration register (shutdown/continuous mode), read-only temperature and manufacturer ID registers, and power-on reset behavior that initializes D15–D2 to 11111111000000XX. Conversion time is 280 ms (max) in SOIC package, and shutdown current is 3 μA (typ) at V+ = 3.3 V.

Key Specifications

Parameter	Value and Actual Design Meaning
Temperature Resolution	0.0625°C per LSB - enables precise thermal threshold detection and fine-grained thermal profiling in embedded control loops.
Operating Range	−55°C to +150°C - supports operation in harsh environments including motor drives, power supplies, and under-hood automotive electronics.
Accuracy	±1.25°C (max) from −10°C to +65°C - ensures reliable thermal protection without calibration in standard computing and office equipment.
Supply Voltage	3.0V to 5.5V - compatible with common 3.3V and 5V logic rails without level-shifting circuitry.
Quiescent Current	265 μA (typ) active, 3 μA (typ) shutdown - allows low-duty-cycle polling in battery-backed or energy-constrained monitoring applications.
Interface Protocol	SPI/MICROWIRE 3-wire (CS, SC, SI/O) - simplifies host MCU integration using standard peripheral drivers without custom firmware overhead.
Conversion Time	280 ms (max) - defines minimum sampling interval for closed-loop thermal regulation; supports burst-read strategies for multi-sensor systems.

Pinout & Package

LM74CIM-3/NOPB uses an 8-pin SOIC (Package Number D) with exposed pad not present. Pin functions are validated per TI SNIS107K datasheet Figure 2 and PIN DESCRIPTIONS table.

Pin	Circuit Role	Design Meaning
1 (SI/O)	Serial I/O bidirectional data line	Tri-state during CS high; transmits temperature data on falling SC edge and receives config commands on rising SC edge.
2 (SC)	Serial clock input (Schmitt-triggered)	Accepts up to 10 MHz clock; timing-critical for meeting t1–t7 specs - requires clean, monotonic edges to avoid metastability.
3 (NC)	No connection	Internally unconnected; must remain floating - no pull-up/down or routing required.
4 (GND)	Power supply ground	Primary return path for analog and digital currents; should connect to low-impedance PCB ground plane near device.
5 (NC)	No connection	Internally unconnected; must remain floating - no routing or termination needed.
6 (NC)	No connection	Internally unconnected; must remain floating - avoids unintended coupling or parasitic paths.
7 (CS)	Chip select input	Active-low enable; initiates communication when driven low; must be stable before first SC edge to prevent bus contention.
8 (V+)	Positive supply voltage input	Accepts 3.0V–5.5V; requires local 0.1 μF ceramic bypass capacitor to GND to suppress switching noise and ensure ADC stability.

Key Features

Feature	Design Value
12-bit plus sign temperature output	Delivers signed two's complement code (D15–D3) with 0.0625°C granularity - eliminates software sign-extension and scaling overhead in host firmware.
Hardware shutdown mode	Reduces supply current to ≤3 μA (typ); entered via 16-bit write of XX FF - enables ultra-low-power periodic wake-and-measure thermal logging.
Self-identifying manufacturer ID register	Returns fixed 1000 0000 0000 00XX pattern in shutdown - provides runtime verification of device authenticity and interface integrity without external ROM.
Power-on reset (POR) state guarantee	Initializes temperature register to known 11111111000000XX pattern - allows host to poll D2 flag to detect completion of first valid conversion.
SOIC-8 thermal performance	θJA = 160°C/W on 2 oz copper PCB - enables accurate board-temperature tracking with minimal thermal lag versus DSBGA variants.

Applications

Hard Disk Drive Thermal Protection	Industrial Motor Drive Cabinet Monitoring
Use Scenario: Real-time temperature monitoring of HDD spindle motor and controller ICs to prevent thermal runaway during sustained write operations. IC Role / Device Role / Timing Role: Standalone temperature sensor providing 0.0625°C-resolution digital readings via SPI to host controller; updated every 280 ms. Use Value: Enables dynamic spin-down or throttling before reaching 70°C critical threshold - extends drive lifetime and prevents data corruption.	Use Scenario: Continuous cabinet ambient temperature measurement in variable-frequency drive enclosures exposed to convection heating and ambient drift. IC Role / Device Role / Timing Role: Primary thermal sentinel interfacing directly with ARM Cortex-M4 MCU over 3-wire SPI; polled every 500 ms. Use Value: Triggers forced-air cooling activation at 65°C and initiates safe shutdown at 95°C - maintains IEC 61800-5-1 compliance without external signal conditioning.
Server CPU VRM Thermal Feedback	Medical Imaging Power Supply Monitoring
Use Scenario: Localized temperature sensing adjacent to multiphase buck converter MOSFETs supplying CPU core voltage in 1U rack servers. IC Role / Device Role / Timing Role: High-accuracy die-temperature proxy mounted on same PCB layer as VRM components; reads every 100 ms in continuous mode. Use Value: Detects localized hotspots exceeding ±1.25°C accuracy spec at 60°C - enables per-phase current derating to maintain <90°C junction temp.	Use Scenario: Monitoring heat buildup in high-voltage X-ray generator power supplies where thermal drift impacts kV stability and image fidelity. IC Role / Device Role / Timing Role: Isolated temperature node reporting to safety-critical microcontroller via opto-isolated SPI lines; operates from −55°C to +150°C range. Use Value: Prevents >0.5% kV output deviation by initiating thermal compensation at 45°C - meets IEC 62304 Class C software requirements for diagnostic coverage.

Hard Disk Drive Thermal Protection

Industrial Motor Drive Cabinet Monitoring

Use Scenario: Real-time temperature monitoring of HDD spindle motor and controller ICs to prevent thermal runaway during sustained write operations.

IC Role / Device Role / Timing Role: Standalone temperature sensor providing 0.0625°C-resolution digital readings via SPI to host controller; updated every 280 ms.

Use Value: Enables dynamic spin-down or throttling before reaching 70°C critical threshold - extends drive lifetime and prevents data corruption.

Use Scenario: Continuous cabinet ambient temperature measurement in variable-frequency drive enclosures exposed to convection heating and ambient drift.

IC Role / Device Role / Timing Role: Primary thermal sentinel interfacing directly with ARM Cortex-M4 MCU over 3-wire SPI; polled every 500 ms.

Use Value: Triggers forced-air cooling activation at 65°C and initiates safe shutdown at 95°C - maintains IEC 61800-5-1 compliance without external signal conditioning.

Server CPU VRM Thermal Feedback

Medical Imaging Power Supply Monitoring

Use Scenario: Localized temperature sensing adjacent to multiphase buck converter MOSFETs supplying CPU core voltage in 1U rack servers.

IC Role / Device Role / Timing Role: High-accuracy die-temperature proxy mounted on same PCB layer as VRM components; reads every 100 ms in continuous mode.

Use Value: Detects localized hotspots exceeding ±1.25°C accuracy spec at 60°C - enables per-phase current derating to maintain <90°C junction temp.

Use Scenario: Monitoring heat buildup in high-voltage X-ray generator power supplies where thermal drift impacts kV stability and image fidelity.

IC Role / Device Role / Timing Role: Isolated temperature node reporting to safety-critical microcontroller via opto-isolated SPI lines; operates from −55°C to +150°C range.

Use Value: Prevents >0.5% kV output deviation by initiating thermal compensation at 45°C - meets IEC 62304 Class C software requirements for diagnostic coverage.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MAX31850KASA+	16-bit resolution, 1-Wire interface, ±0.25°C accuracy (−40°C to +125°C), 8-pin SOIC package	Requires single-wire bus with parasitic power capability; lacks native SPI support and extended −55°C rating	Select when minimizing interconnect count is critical and accuracy >0.25°C is required below 125°C - not suitable for −55°C operation or existing SPI infrastructure.
ADT7410TRZ-REEL7	16-bit resolution, I²C interface, ±0.25°C accuracy (−40°C to +150°C), 8-pin SOIC package, 200 μA typical supply current	Uses I²C instead of SPI; includes programmable fault queue and extended accuracy over wider range than LM74CIM-3/NOPB	Prefer for new designs needing higher precision and I²C compatibility; not drop-in for SPI-based legacy systems or −55°C cold-start requirements.

Compared with MAX31850KASA+ and ADT7410TRZ-REEL7, the LM74CIM-3/NOPB offers guaranteed −55°C functionality and SPI-native integration at lower cost, making it optimal for industrial thermal protection where 0.0625°C resolution and proven SOIC reliability outweigh need for sub-0.5°C accuracy.

Availability

LM74CIM-3/NOPB is available at Aetrix Electronics and suitable for hard disk drives, industrial motor drives, server VRMs, and medical imaging power supplies requiring stable component supply across extended temperature and long-lifecycle programs.

Supply support for LM74CIM-3/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 company headquartered in Dallas, Texas, specializing in analog, embedded processing, and connectivity technologies for industrial, automotive, and communications markets.

The LM74 product line was designed specifically for high-accuracy, low-power digital temperature sensing in space-constrained and thermally demanding applications - emphasizing robust SPI interface, wide operating range, and factory-trimmed calibration.

FAQ

What is the absolute maximum supply voltage for LM74CIM-3/NOPB?

The absolute maximum supply voltage for LM74CIM-3/NOPB is 6.0 V, as specified in the Absolute Maximum Ratings table of the TI SNIS107K datasheet. Operation above this voltage risks permanent damage. The recommended operating range remains 3.0 V to 5.5 V, and the device is fully characterized within that window for all electrical and thermal parameters.

Does LM74CIM-3/NOPB support true SPI mode 0 (CPOL = 0, CPHA = 0)?

Yes, LM74CIM-3/NOPB supports SPI mode 0: data is sampled on the rising edge of SC and shifted out on the falling edge, with CS active-low and SC idle low. This matches standard SPI mode 0 timing, and TI confirms compatibility with MICROWIRE - both protocols require the same clock polarity and phase alignment for reliable communication.

How does the LM74CIM-3/NOPB indicate completion of its first temperature conversion after power-up?

The LM74CIM-3/NOPB sets bit D2 (the "conversion complete" flag) high in the temperature register after the first full conversion completes. Upon power-on reset, D2 is low and the register holds 11111111000000XX. Host firmware can poll D2 to determine when valid temperature data (D15–D3) is ready - eliminating fixed delay timing assumptions.

Can LM74CIM-3/NOPB be used in systems requiring RoHS compliance?

Yes - LM74CIMX-3/NOPB (tape-and-reel variant) is RoHS-compliant and carries "SN" lead finish. While LM74CIM-3/NOPB itself is marked "Obsolete" in TI's packaging addendum, Aetrix Electronics supplies only RoHS-compliant, actively manufactured equivalents with full traceability and MSL-1 reflow qualification per TI's Level-1-260C-UNLIM rating.

What is the thermal resistance (θJA) of LM74CIM-3/NOPB on a standard PCB?

The thermal resistance (θJA) of LM74CIM-3/NOPB is 160°C/W when mounted on a printed circuit board with 2 oz copper foil, as documented in TI SNIS107K Section "Operating Ratings". This value reflects board-level conduction and convection - critical for estimating die temperature rise above ambient during continuous operation.

LM74CIM-3/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 ~ 150°C

Sensing Temperature - Remote:: -

Output Type:: SPI

Voltage - Supply:: 3V ~ 5.5V

Resolution:: 12 b

Features:: Shutdown Mode

Accuracy - Highest (Lowest):: 1.25°C (±5°C)

Test Condition:: -10°C ~ 65°C (-55°C ~ 150°C)

Operating Temperature:: -55°C ~ 150°C

Mounting Type:: Surface Mount

Grade:: -

Qualification:: -

Supplier Device Package:: 8-SOIC

LM74CIM-3/NOPB FAQ

1.How can I place an order for LM74CIM-3/NOPB through Aetrix?

Please submit a Request for Quotation (RFQ) for LM74CIM-3/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 LM74CIM-3/NOPB reliable?

The price and inventory of LM74CIM-3/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM74CIM-3/NOPB is usually 5 days.

3.What payment methods are accepted for LM74CIM-3/NOPB?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM74CIM-3/NOPB transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LM74CIM-3/NOPB?

LM74CIM-3/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LM74CIM-3/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 LM74CIM-3/NOPB?

For technical support, including LM74CIM-3/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM74CIM-3/NOPB requirements.

6.How does Aetrix verify that LM74CIM-3/NOPB is sourced from the original manufacturer or authorized distributors?

All LM74CIM-3/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 LM74CIM-3/NOPB meets industry standards.

7.What is the process for return or replacement of LM74CIM-3/NOPB?

All LM74CIM-3/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM74CIM-3/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 LM74CIM-3/NOPB part is unused and in its original packaging.

Return procedure for LM74CIM-3/NOPB:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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