LM74CIMX-5 Equivalent & Substitute Parts

Part Overview

The LM74CIMX-5 is a digital temperature sensor manufactured by Texas Instruments, designed for local temperature measurement across a -55°C to 150°C range with 12-bit resolution and SPI output. The part is classified as obsolete, making equivalent substitutes necessary for new designs and ongoing production requirements. Substitute parts must maintain compatibility with the 8-SOIC package, SPI interface, 12-bit resolution, and supply voltage range of 3V to 5.5V.

Key Parameters

Parameter	LM74CIMX-5
Manufacturer	Texas Instruments
Sensor Type	Digital, Local
Temperature Range (Local)	-55°C ~ 150°C
Output Type	SPI
Supply Voltage	3V ~ 5.5V
Resolution	12 bits
Package	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Accuracy	±1.25°C (-10°C ~ 65°C), ±5°C (-55°C ~ 150°C)
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following critical parameters:

Package compatibility: 8-SOIC form factor required
Interface: SPI output mandatory
Resolution: 12-bit minimum
Supply voltage range: Must support 3V to 5.5V operation
Mounting type: Surface mount only
Temperature sensing capability: Local temperature measurement

The LM74CIMX-5/NOPB is a direct equivalent from Texas Instruments with identical electrical specifications and active product status. The Microchip TC77 series (TC77-3.3MOA, TC77-3.3MOATR, TC77-5.0MOA, TC77-5.0MOATR) meets all core substitution criteria with compatible package, interface, resolution, and mounting type. The TC77 series operates across -55°C to 125°C, which covers the primary operating range of the original part, though the upper temperature limit is reduced from 150°C to 125°C.

Parameter Comparison

Parameter	LM74CIMX-5	LM74CIMX-5/NOPB	TC77-3.3MOA	TC77-3.3MOATR	TC77-5.0MOA	TC77-5.0MOATR
Manufacturer	Texas Instruments	Texas Instruments	Microchip Technology	Microchip Technology	Microchip Technology	Microchip Technology
Sensor Type	Digital, Local	Digital, Local	Digital, Local	Digital, Local	Digital, Local	Digital, Local
Temperature Range	-55°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C
Output Type	SPI	SPI	SPI	SPI	SPI	SPI
Supply Voltage	3V ~ 5.5V	3V ~ 5.5V	2.7V ~ 5.5V	2.7V ~ 5.5V	2.7V ~ 5.5V	2.7V ~ 5.5V
Resolution	12 bits	12 bits	12 bits	12 bits	12 bits	12 bits
Package	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Accuracy	±1.25°C / ±5°C	±1.25°C / ±5°C	±1°C / ±3°C	±1°C / ±3°C	±1°C / ±3°C	±1°C / ±3°C
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging Type	-	Cut Tape (CT) & Digi-Reel®	Tube	Tape & Reel (TR)	Tube	Tape & Reel (TR)

Engineering Selection Recommendations

The LM74CIMX-5/NOPB is the primary substitute, offering identical electrical specifications with active product status and ROHS3 compliance. This part is recommended for applications requiring the full -55°C to 150°C temperature range.

The Microchip TC77 series provides functional equivalence with the following considerations: all TC77 variants operate to 125°C maximum, reducing the upper temperature limit by 25°C. The TC77 series demonstrates improved accuracy (±1°C vs. ±1.25°C in the -10°C to 65°C range) and expanded lower supply voltage support (2.7V vs. 3V minimum). All TC77 variants are ROHS3 compliant and carry active product status.

Selection between TC77 packaging options depends on procurement requirements: TC77-3.3MOA and TC77-5.0MOA are supplied in tube packaging; TC77-3.3MOATR and TC77-5.0MOATR are supplied in tape and reel format. The voltage suffix (3.3 or 5.0) indicates the nominal supply voltage for which the part is optimized but does not restrict operation within the 2.7V to 5.5V range.

Frequently Asked Questions (FAQ)

Q: Can the TC77 series directly replace the LM74CIMX-5 in all applications?

A: The TC77 series is functionally compatible for applications operating within -55°C to 125°C. Applications requiring temperature measurement above 125°C must use the LM74CIMX-5/NOPB to maintain the full -55°C to 150°C capability.

Q: What is the difference between TC77-3.3MOA and TC77-5.0MOA?

A: Both parts operate across the 2.7V to 5.5V supply range. The voltage designation indicates the nominal supply voltage for optimization but does not restrict operation. Selection should be based on packaging preference (tube) and procurement availability.

Q: Are the TC77-3.3MOATR and TC77-5.0MOATR suitable for high-volume production?

A: Yes. Both parts are supplied in tape and reel format, which is standard for automated assembly processes. The MOATR designation indicates tape and reel packaging. Moisture sensitivity level (MSL) 3 with 168-hour rating applies to these variants.

Q: Does the LM74CIMX-5/NOPB require any design changes compared to the original LM74CIMX-5?

A: No design changes are required. The LM74CIMX-5/NOPB maintains identical pinout, electrical specifications, and package dimensions. The primary difference is active product status and ROHS3 compliance.

Q: What is the impact of the accuracy difference between LM74CIMX-5 and TC77 series?

A: The TC77 series provides tighter accuracy (±1°C vs. ±1.25°C) in the -10°C to 65°C range and ±3°C vs. ±5°C across the full operating range. This represents improved measurement precision for temperature-sensitive applications.

Q: Can I use TC77 parts in existing inventory management systems designed for LM74CIMX-5?

A: Yes, provided the application temperature range does not exceed 125°C. Verify that your system accommodates the different manufacturer (Microchip vs. Texas Instruments) and part numbering scheme for tracking and documentation purposes.

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