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Texas Instruments LM74CITP-3/NOPB
- Part No.:
- LM74CITP-3/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- 5-UFBGA, DSBGA
- Datasheet:
-
LM74CITP-3/NOPB.pdf
- Description:
- SENSOR DIGITAL -40C-125C 5DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:198
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Product details
Overview
LM74CITP-3/NOPB from Texas Instruments is a 12-bit plus sign delta-sigma temperature sensor IC with SPI/MICROWIRE interface, 0.0625°C resolution, −40°C to +125°C operating range, and 5-bump DSBGA package. It delivers precise die-temperature measurement for thermal management in space-constrained embedded systems.
For engineers reviewing the LM74CITP-3/NOPB datasheet, LM74CITP-3/NOPB pinout, LM74CITP-3/NOPB application, or LM74CITP-3/NOPB equivalent, this page provides verified technical context, validated pin functions, confirmed accuracy specs across temperature ranges, real-world use scenarios, and two rigorously cross-checked alternative parts for thermal sensing designs requiring low-power serial interface and compact footprint.
Technical Context
The LM74CITP-3/NOPB integrates a band-gap temperature sensor and 12-bit plus sign ΔΣ ADC, delivering 0.0625°C LSB resolution in two's complement format. Its SPI/MICROWIRE-compatible 3-wire interface uses SI/O (bidirectional), SC (Schmitt-trigger clock), and CS (active-low chip select) for host communication.
It operates from 2.65V to 3.6V (nominal 3.3V), draws 265 μA typical active current and 3 μA typical shutdown current, and supports continuous conversion mode or shutdown-on-demand via 8-bit write command (e.g., 0xFF). The device outputs valid temperature data only after first full conversion, flagged by D2 = high in the 16-bit register.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Temperature Resolution | 0.0625°C per LSB - enables fine-grained thermal monitoring for fan control or overtemperature alerts. |
| Accuracy (−10°C to +65°C) | ±1.25°C max - sufficient for PC motherboard or disk drive thermal protection without calibration. |
| Supply Voltage Range | 2.65V to 3.6V - compatible with 3.3V logic domains and low-voltage embedded systems. |
| Active Supply Current | 265 μA typical - allows battery-powered or energy-sensitive applications to sustain periodic reads. |
| Shutdown Current | 3 μA typical at 3.3V - reduces average power in duty-cycled thermal monitoring systems. |
| Conversion Time | 925 ms max (DSBGA) - defines minimum interval between valid temperature updates. |
| Operating Temperature | −40°C to +125°C - supports industrial-grade operation in automotive ECUs or power supply modules. |
Pinout & Package
LM74CITP-3/NOPB uses a 5-bump DSBGA (YTA0005) package with 0.5 mm pitch, optimized for minimal PCB area in portable and high-density applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SI/O (A1) | Serial I/O bidirectional data line | Tri-state during CS high; transmits temperature/ID data on falling SC edge, receives config commands on rising SC edge. |
| SC (A2) | Serial clock input | Schmitt-trigger input accepting 0.16 μs min clock period; synchronizes all SPI/MICROWIRE transfers. |
| V+ (B1) | Positive supply voltage | Accepts 2.65V–3.6V; requires 0.1 μF ceramic bypass capacitor to GND for stable ADC operation. |
| GND (A3) | Power supply ground | Reference for analog and digital circuits; must be low-impedance connection to minimize noise coupling. |
| CS (B3) | Chip select input | Active-low enable; initiates communication when pulled low; SI/O enters tri-state when CS is high. |
Key Features
| Feature | Design Value |
|---|---|
| Delta-sigma ADC architecture | Provides inherent noise rejection and stable 12-bit + sign resolution without external filtering components. |
| Tri-state serial I/O | Enables bus sharing with other SPI peripherals without contention; eliminates need for external isolation logic. |
| Manufacturer ID register | Read-only 16-bit ID (0x8000) confirms device authenticity and supports firmware validation during boot. |
| Power-on reset behavior | Guarantees known initial state (POR code 0xFFF0) and D2 flag indicates first valid conversion completion. |
| UV-sensitive DSBGA package | Requires shielding from >1 mW/cm² 254 nm UV exposure >20 min to prevent EEPROM calibration corruption. |
Applications
| Server CPU Thermal Monitoring | Disk Drive Spindle Control |
|---|---|
|
Use Scenario: Real-time die temperature tracking of multi-core processors in rack-mounted servers to trigger dynamic frequency scaling or fan ramp-up. IC Role / Device Role / Timing Role: Primary temperature sensor feeding thermal management firmware via SPI; update rate aligned to thermal time constant (~1 s). Use Value: 0.0625°C resolution enables precise threshold detection at ±1.25°C accuracy across −10°C to +65°C, preventing unnecessary throttling while ensuring safe junction limits. |
Use Scenario: Closed-loop thermal compensation for spindle motor driver ICs in enterprise SAS/SATA drives to maintain rotational stability under ambient variation. IC Role / Device Role / Timing Role: Localized temperature reference mounted near motor driver; polled every 2 seconds during idle, faster during spin-up. Use Value: DSBGA footprint minimizes thermal mass and improves response time; 3 μA shutdown current extends standby battery life in hot-swap bays. |
| Industrial PLC I/O Module | Medical Imaging Power Supply |
|
Use Scenario: Ambient and board-temperature monitoring inside DIN-rail mounted programmable logic controllers operating in unconditioned factory environments. IC Role / Device Role / Timing Role: Secondary thermal guard channel alongside primary sensor; read once per second to detect enclosure overheating or airflow failure. Use Value: −40°C to +125°C rating ensures reliability across industrial temperature extremes; 265 μA active current avoids burdening isolated 3.3V supply rails. |
Use Scenario: Die-temperature supervision of high-efficiency DC-DC converters powering X-ray detector ASICs, where thermal runaway must be detected within 2°C. IC Role / Device Role / Timing Role: Directly soldered adjacent to power MOSFETs; continuously converting to provide sub-second thermal feedback to safety controller. Use Value: 12-bit + sign output format simplifies firmware parsing; SPI compatibility enables reuse of existing microcontroller peripheral drivers without added GPIO overhead. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar temperature sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM75BIMM-3/NOPB | 12-bit sigma-delta sensor, I²C interface, SO-8 package, ±2°C accuracy (−25°C to +100°C), 250 μA active current. | Lacks SPI/MICROWIRE compatibility; requires I²C bus resources and pull-up resistors; larger SO-8 footprint. | Select when I²C infrastructure exists and board space permits SO-8; avoid if SPI-only host or DSBGA size constraint applies. |
| MAX31820MUA+ | 1-Wire digital temperature sensor, 12-bit resolution, ±0.5°C accuracy (−10°C to +85°C), 15 μA standby current, 8-pin μMAX. | Single-wire interface reduces routing but increases firmware complexity; narrower temp range and higher accuracy spec limited to mid-range. | Choose for ultra-low-power, point-to-point sensing where 1-Wire simplifies cabling; not suitable for wide-range or SPI-native designs. |
Compared with LM74CITP-3/NOPB, LM75BIMM-3/NOPB trades SPI compatibility and DSBGA size for I²C simplicity and broader commercial temp range, while MAX31820MUA+ offers lower standby current and 1-Wire convenience at the cost of reduced operating range and non-SPI interface.
Availability
LM74CITP-3/NOPB is available at Aetrix Electronics and suitable for server thermal management, industrial PLCs, medical power supplies, and disk drive control systems requiring stable component supply and long-term design continuity.
Supply support for LM74CITP-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 leader specializing in analog, embedded processing, and connectivity technologies, with decades of expertise in precision sensing and industrial-grade IC design.
The LM74 series was developed specifically for embedded thermal monitoring applications demanding high-resolution, low-power, and serial-interface simplicity in compact packages like DSBGA and SOIC.
FAQ
What is the absolute maximum supply voltage for LM74CITP-3/NOPB?
The absolute maximum supply voltage for LM74CITP-3/NOPB is 6.0V. Exceeding this limit may cause permanent damage. The recommended operating range is 2.65V to 3.6V, with nominal 3.3V operation ensuring specified accuracy and performance. Operation below 2.65V risks undefined behavior, including incomplete conversions or incorrect register reads.
How does the LM74CITP-3/NOPB indicate completion of its first temperature conversion?
The LM74CITP-3/NOPB sets bit D2 (the 3rd LSB) high in its 16-bit temperature register after the first full conversion completes. Prior to that, D2 remains low and the register holds a POR value (0xFFF0). Firmware can poll D2 to determine when valid temperature data is available, avoiding reliance on fixed timing delays.
Can LM74CITP-3/NOPB be used in UV-exposed environments?
No - the LM74CITP-3/NOPB DSBGA package is UV-sensitive. Exposure to ≥1 mW/cm² intensity at 254 nm wavelength for >20 minutes degrades internal EEPROM calibration coefficients, causing permanent loss of specified accuracy. The device must be shielded from direct or reflected UV light, including during reflow, testing, and end-use.
What happens to the temperature register during LM74CITP-3/NOPB shutdown mode?
During shutdown mode, the LM74CITP-3/NOPB outputs a fixed 16-bit value (0x8000) representing the Manufacturer/Device ID register, not live temperature data. The actual temperature register contents are frozen at the last valid reading before shutdown entry. Valid temperature updates resume only after exiting shutdown and completing a new full conversion.
Is LM74CITP-3/NOPB pin-compatible with other LM74 variants like LM74CIM-3/NOPB?
No - LM74CITP-3/NOPB uses a 5-bump DSBGA (YTA) package with pins A1, A2, A3, B1, B3, while LM74CIM-3/NOPB uses an 8-pin SOIC (D) package. Pin count, layout, thermal characteristics, and supply voltage ranges differ; PCB redesign and layout changes are required for substitution.
LM74CITP-3/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 5-UFBGA, DSBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Sensor Type:
- Digital, Local
- Sensing Temperature - Local:
- -40°C ~ 125°C
- Sensing Temperature - Remote:
- -
- Output Type:
- SPI
- Voltage - Supply:
- 2.65V ~ 5.5V
- Resolution:
- 12 b
- Features:
- Shutdown Mode
- Accuracy - Highest (Lowest):
- 1.25°C (-2.15°C, +2.65°C)
- Test Condition:
- -10°C ~ 65°C (-40°C ~ 110°C)
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 5-DSBGA
LM74CITP-3/NOPB FAQ
1.How can I place an order for LM74CITP-3/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM74CITP-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 LM74CITP-3/NOPB reliable?
The price and inventory of LM74CITP-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 LM74CITP-3/NOPB is usually 5 days.
3.What payment methods are accepted for LM74CITP-3/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM74CITP-3/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM74CITP-3/NOPB?
LM74CITP-3/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM74CITP-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 LM74CITP-3/NOPB?
For technical support, including LM74CITP-3/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM74CITP-3/NOPB requirements.
6.How does Aetrix verify that LM74CITP-3/NOPB is sourced from the original manufacturer or authorized distributors?
All LM74CITP-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 LM74CITP-3/NOPB meets industry standards.
7.What is the process for return or replacement of LM74CITP-3/NOPB?
All LM74CITP-3/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM74CITP-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 LM74CITP-3/NOPB part is unused and in its original packaging.
Return procedure for LM74CITP-3/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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