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Texas Instruments LM74CIMX-5/NOPB
- Part No.:
- LM74CIMX-5/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM74CIMX-5/NOPB.pdf
- Description:
- SENSOR DIGITAL -55C-150C 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,046
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Product details
Overview
LM74CIMX-5/NOPB from Texas Instruments is a 12-bit plus sign delta-sigma temperature sensor IC with SPI/MICROWIRE interface, operating from 3.0V to 5.5V supply, delivering 0.0625°C resolution over −55°C to +150°C, and used for real-time thermal monitoring in high-reliability industrial and computing systems.
For engineers reviewing the LM74CIMX-5/NOPB datasheet, LM74CIMX-5/NOPB pinout, LM74CIMX-5/NOPB application, or LM74CIMX-5/NOPB equivalent, key selection considerations include its SOIC-8 package, shutdown current <10 μA, ±1.25°C accuracy from −10°C to +65°C, and compatibility with microcontroller SPI peripherals requiring minimal firmware overhead.
Technical Context
The LM74CIMX-5/NOPB integrates a band-gap temperature sensing element with a 12-bit plus sign delta-sigma ADC, outputting two's complement digital temperature data via a 3-wire SPI/MICROWIRE-compatible serial interface. It supports continuous conversion mode by default and enters sub-10 μA shutdown on receipt of FFh command.
Its internal register structure includes read-only temperature and manufacturer ID registers and a write-only configuration register. Communication requires 32 clock cycles per full transaction (16-bit transmit + 16-bit receive), with data latched on SC rising edge (input) and shifted out on falling edge (output).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Temperature Resolution | 0.0625°C per LSB - enables precise thermal threshold detection at 1/16°C granularity |
| Operating Range | −55°C to +150°C - supports extended industrial and under-hood automotive thermal monitoring |
| Supply Voltage | 3.0V to 5.5V - compatible with standard 3.3V and 5V logic rails without level-shifting |
| Accuracy | ±1.25°C max (−10°C to +65°C) - meets tight thermal control requirements in PC and disk drive thermal management |
| Quiescent Current | 265 μA typ (active), 3 μA typ (shutdown) - enables low-power periodic polling in battery-backed systems |
| Interface Protocol | SPI/MICROWIRE 3-wire - interoperable with common MCU SPI peripherals using CS, SC, SI/O lines |
| Conversion Time | 280 ms max (SOIC) - defines minimum interval between valid temperature reads in continuous mode |
Pinout & Package
LM74CIMX-5/NOPB uses an 8-pin SOIC (Package D) with exposed pad not present; footprint matches industry-standard SOIC-8 layout and reflow profile (MSL Level-1, 260°C peak).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SI/O) | Serial I/O bidirectional data line | Tri-state capable; transmits temperature data on falling SC edge, receives config commands on rising SC edge |
| 2 (SC) | Serial clock input (Schmitt-triggered) | Accepts up to 6.25 MHz clock (t1 ≥ 0.16 μs); determines timing of all serial transfers |
| 3 (NC) | No connection | Internally unconnected; must remain floating or grounded per PCB layout best practice |
| 4 (GND) | Power supply ground | Reference for analog sensing and digital I/O; requires low-impedance connection to system ground plane |
| 5 (NC) | No connection | Internally unconnected; no external tie required |
| 6 (NC) | No connection | Internally unconnected; no external tie required |
| 7 (CS) | Chip select input | Active-low enable; initiates serial communication when pulled low; supports multi-drop bus sharing |
| 8 (V+) | Positive supply voltage input | 3.0–5.5V rail; requires 0.1 μF ceramic bypass capacitor placed within 5 mm of pin |
Key Features
| Feature | Design Value |
|---|---|
| 12-bit + sign temperature output | Delivers 13-bit two's complement data (D15–D3) with fixed D2 flag indicating conversion completion |
| Hardware shutdown command | FFh write places device in <10 μA state while retaining SPI responsiveness for wake-up polling |
| Manufacturer ID register | Read-only 16-bit ID (1000 0000 0000 00XX) accessible only during shutdown - enables firmware verification of TI authenticity |
| Power-on reset behavior | Guaranteed POR state with known register contents (1111 1111 0000 00XX) and D2 flag low until first conversion completes |
| Thermal path optimization | Die temperature tracked via pin conduction - ensures accurate PCB-localized thermal measurement without air-gap error |
Applications
| Server CPU Thermal Throttling | Disk Drive Spindle Motor Monitoring |
|---|---|
Use Scenario: Real-time die temperature monitoring adjacent to x86 CPU VRM to trigger dynamic frequency scaling before thermal throttling. IC Role / Device Role / Timing Role: Primary temperature sensor feeding closed-loop thermal control firmware via SPI at ≤10 Hz polling rate. Use Value: Enables ±1.25°C accuracy across −10°C to +65°C ambient range, matching Intel thermal specification zones for reliable Tj estimation. | Use Scenario: Mounting on HDD controller board near spindle motor driver IC to detect overheating before mechanical failure. IC Role / Device Role / Timing Role: Standalone thermal watchdog interfaced to ARM Cortex-M0 host MCU using minimal GPIO-controlled SPI. Use Value: 280 ms max conversion time allows integration into existing 500 ms motor health check cycle without adding latency. |
| Industrial PLC Cabinet Ambient Sensing | Laser Printer Fuser Assembly Control |
Use Scenario: Distributed thermal monitoring inside sealed industrial PLC enclosures where ambient rise indicates cooling fan failure or dust clogging. IC Role / Device Role / Timing Role: Low-power node in RS-485 networked sensor array, waking every 30 seconds to report temperature via Modbus RTU over UART-to-SPI bridge. Use Value: 3 μA shutdown current extends battery life in backup-powered monitoring nodes; −55°C to +150°C range covers worst-case cabinet conditions. | Use Scenario: Direct mounting on fuser roller thermal mass to regulate heater lamp duty cycle and prevent paper scorching or roller warping. IC Role / Device Role / Timing Role: Analog temperature feedback replacement for thermistor-based control loops, reducing calibration drift and component count. Use Value: 0.0625°C resolution enables fine-grained PID tuning; SOIC-8 package withstands repeated thermal cycling up to 150°C without solder fatigue. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar temperature sensor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX31850KASA+ | 1-Wire interface, integrated cold-junction compensation for thermocouples; 0.125°C resolution; −40°C to +125°C range | Designed for thermocouple signal conditioning, not direct die temperature sensing | Select only if migrating from K-type thermocouple infrastructure; not drop-in for LM74CIMX-5/NOPB SPI designs |
| ADT7410TRZ-REEL7 | I²C interface, 16-bit resolution (0.0078°C), ±0.25°C accuracy (−40°C to +125°C), 250 μA active current | Narrower temperature range and different bus protocol require firmware and layout changes | Prefer for higher-accuracy, lower-noise applications where I²C bus availability and tighter tolerance justify redesign |
Compared with MAX31850KASA+ and ADT7410TRZ-REEL7, LM74CIMX-5/NOPB offers SPI-native integration, wider −55°C to +150°C operation, and proven reliability in high-temperature SOIC packaging - making it optimal for legacy industrial controllers and thermal protection circuits where bus compatibility and ruggedness are prioritized over ultra-fine resolution.
Availability
LM74CIMX-5/NOPB is available at Aetrix Electronics and suitable for server thermal management, industrial PLC cabinet monitoring, and laser printer fuser control requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM74CIMX-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 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 embedded systems requiring simple serial interfacing and robust operation across extreme industrial temperature ranges.
FAQ
What is the absolute maximum supply voltage rating for LM74CIMX-5/NOPB?
The absolute maximum supply voltage for LM74CIMX-5/NOPB is 6.0V. Operation above 5.5V or below 3.0V violates the recommended operating conditions and may cause permanent damage or parametric shift. The device is specified for reliable operation only within 3.0V to 5.5V, with typical quiescent current and accuracy guaranteed across that full range. Exceeding 6.0V risks gate oxide breakdown in the internal CMOS circuitry.
Does LM74CIMX-5/NOPB support true SPI mode 0 (CPOL=0, CPHA=0)?
Yes, LM74CIMX-5/NOPB operates in SPI mode 0: SC idles low (CPOL = 0), and data is sampled on the rising edge of SC (CPHA = 0). The datasheet confirms data input is latched on the rising edge and output shifts on the falling edge - matching standard mode 0 timing. No configuration register setting is required; this behavior is hardwired and compliant with MICROWIRE as well.
How does the LM74CIMX-5/NOPB indicate completion of its first temperature conversion after power-up?
LM74CIMX-5/NOPB uses bit D2 in the temperature register as a conversion-complete flag. After power-on reset, D2 is low; it transitions high only after the first full temperature conversion completes. Firmware can poll D2 to determine when valid data (D15–D3) replaces the POR value (1111 1111 0000 00XX). This eliminates need for fixed delay timing and ensures synchronization with actual conversion readiness.
Can LM74CIMX-5/NOPB be used in UV-exposed environments?
No - LM74CIMX-5/NOPB is not rated for UV exposure. While its SOIC package provides full epoxy encapsulation (unlike DSBGA variants), prolonged UV irradiation may degrade package molding compound integrity and accelerate moisture ingress. TI documentation explicitly warns against UV exposure for DSBGA versions due to EEPROM calibration corruption; though SOIC is less vulnerable, no UV resistance testing or qualification is specified for LM74CIMX-5/NOPB.
What is the thermal resistance (θJA) of LM74CIMX-5/NOPB when mounted on a standard 2 oz copper PCB?
The junction-to-ambient thermal resistance (θJA) of LM74CIMX-5/NOPB in SOIC-8 package is 160°C/W when mounted on a printed circuit board with 2 oz copper foil. This value assumes standard JEDEC 51-7 test conditions and enables accurate die temperature estimation from ambient measurements. Higher θJA values will occur with reduced copper area or lack of thermal vias, directly impacting temperature reading fidelity.
LM74CIMX-5/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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
LM74CIMX-5/NOPB FAQ
1.How can I place an order for LM74CIMX-5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM74CIMX-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 LM74CIMX-5/NOPB reliable?
The price and inventory of LM74CIMX-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 LM74CIMX-5/NOPB is usually 5 days.
3.What payment methods are accepted for LM74CIMX-5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM74CIMX-5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM74CIMX-5/NOPB?
LM74CIMX-5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM74CIMX-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 LM74CIMX-5/NOPB?
For technical support, including LM74CIMX-5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM74CIMX-5/NOPB requirements.
6.How does Aetrix verify that LM74CIMX-5/NOPB is sourced from the original manufacturer or authorized distributors?
All LM74CIMX-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 LM74CIMX-5/NOPB meets industry standards.
7.What is the process for return or replacement of LM74CIMX-5/NOPB?
All LM74CIMX-5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM74CIMX-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 LM74CIMX-5/NOPB part is unused and in its original packaging.
Return procedure for LM74CIMX-5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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