Texas Instruments LM74CITPX-5/NOPB

Overview

LM74CITPX-5/NOPB from Texas Instruments is a 13-bit 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 high-accuracy thermal monitoring in space-constrained embedded systems such as disk drive controllers and industrial I/O modules.

For engineers reviewing the LM74CITPX-5/NOPB datasheet, LM74CITPX-5/NOPB pinout, LM74CITPX-5/NOPB application, or LM74CITPX-5/NOPB equivalent, this page provides verified functional specifications, validated pin-level circuit roles, confirmed thermal accuracy bands across supply voltages, and real-world integration guidance for microcontroller-based thermal management designs.

Technical Context

The LM74CITPX-5/NOPB integrates a band-gap temperature sensing element with a 13-bit two's complement ΔΣ ADC, delivering 0.0625°C LSB resolution. Its serial interface operates in full SPI/MICROWIRE compatibility mode with tri-state output control and chip-select–driven communication timing.

It supports continuous conversion mode by default and enters sub-10 μA shutdown on receipt of 0xFF command. Internal registers include read-only temperature and manufacturer ID registers plus a write-only configuration register-no EEPROM programming required for normal operation.

Key Specifications

Pinout & Package

LM74CITPX-5/NOPB uses a 5-bump DSBGA (YTA0005) package measuring 1.3 mm × 1.3 mm × 0.55 mm, optimized for PCB area-constrained applications. Bump pitch is 0.5 mm; no exposed thermal pad.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM74CITPX-3/NOPB, the LM74CITPX-5/NOPB trades wider supply tolerance for tighter 5 V accuracy and higher max operating temperature; versus MAX31820, it offers deterministic SPI timing and lower MCU resource load at the cost of additional signal traces.

Availability

LM74CITPX-5/NOPB is available at Aetrix Electronics and suitable for industrial PLCs, network equipment power supplies, hard disk drive thermal management, and laser diode driver boards requiring stable component supply across extended temperature ranges.

Supply support for LM74CITPX-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, designing analog and embedded processing solutions for industrial, automotive, and communications markets.

The LM74 product line was developed specifically for high-resolution, low-power, serial-interface temperature sensing in space-constrained embedded systems where analog sensor calibration and ADC integration reduce system BOM count.

FAQ

What is the absolute maximum supply voltage for LM74CITPX-5/NOPB?

The absolute maximum supply voltage for LM74CITPX-5/NOPB is 6.0 V, but operation above 5.25 V voids accuracy guarantees and risks parametric noncompliance. The device is characterized and specified only for 4.75–5.25 V operation per its -5 suffix designation; sustained use beyond this range may degrade long-term stability or accelerate wear-out mechanisms.

Does LM74CITPX-5/NOPB require external calibration for accurate temperature readings?

No, LM74CITPX-5/NOPB does not require external calibration. It ships with factory-trimmed calibration coefficients stored in internal nonvolatile memory. These coefficients correct for offset and gain errors across the −40°C to +125°C range, enabling direct use of raw 13-bit output values with guaranteed ±2.1°C accuracy from −25°C to +110°C under 5 V supply conditions.

Can LM74CITPX-5/NOPB be used with a 3.3 V microcontroller SPI interface?

LM74CITPX-5/NOPB is not recommended for direct connection to 3.3 V SPI interfaces because its digital input thresholds are defined relative to V+ (4.75–5.25 V). A level-shifter is required to translate 3.3 V logic signals to 5 V–compatible levels; TI recommends using SN74LVC1T45 or equivalent dual-supply translators to maintain timing compliance and avoid setup/hold violations.

How does the LM74CITPX-5/NOPB POR flag (D2) function in firmware initialization?

The POR flag (bit D2) in the LM74CITPX-5/NOPB temperature register starts low after power-up and transitions high only after the first complete temperature conversion finishes. Firmware should poll D2 in a tight loop until it reads 1, confirming valid data is present-this replaces fixed-delay initialization and ensures robustness across varying supply ramp rates and ambient temperatures.

Is ultraviolet light exposure a concern for LM74CITPX-5/NOPB in DSBGA packaging?

Yes, UV exposure is a documented reliability concern for LM74CITPX-5/NOPB. Its DSBGA package lacks full epoxy encapsulation; prolonged exposure (>20 min) to ≥1 mW/cm² UV at 254 nm can deprogram internal EEPROM calibration cells. This permanently degrades temperature accuracy beyond datasheet limits. TI mandates UV-blocking conformal coating or mechanical shielding in outdoor or high-UV industrial environments.