LM90CIMM Temperature Sensor Equivalent & Substitute Parts

Part Overview

The LM90CIMM is a digital temperature sensor manufactured by Texas Instruments, designed for local and remote temperature monitoring across 0°C to 85°C operating range. This component features SMBus output, 7-bit local and 10-bit remote resolution, and operates on 3V to 3.6V supply voltage. The part is currently classified as obsolete, making equivalent and substitute parts necessary for ongoing system support and new designs requiring similar functionality.

Key Parameters

Parameter	LM90CIMM
Sensor Type	Digital, Local/Remote
Sensing Temperature - Local	0°C ~ 85°C
Sensing Temperature - Remote	0°C ~ 85°C
Output Type	SMBus
Voltage - Supply	3V ~ 3.6V
Resolution	7 b (Local), 10 b (Remote)
Features	One-Shot, Output Switch, Programmable Limit, Shutdown Mode, Standby Mode
Accuracy	±4°C
Operating Temperature	0°C ~ 125°C
Mounting Type	Surface Mount
Package / Case	8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitute parts for the LM90CIMM are selected based on the following critical parameters:

Core Compatibility Criteria:

SMBus digital output interface
Local and remote temperature sensing capability
8-pin surface mount package (8-TSSOP or 8-MSOP)
3V to 3.6V supply voltage compatibility
One-Shot, Output Switch, Programmable Limit, and Standby Mode features

Substitution Categories:

Direct Equivalent (Pin and Function Compatible): LM90CIMM/NOPB maintains identical electrical and mechanical specifications as the main part, differing only in packaging format (Bulk vs. standard).

Extended Temperature Range Substitutes: ADT7461AARMZ-R, ADT7461ARMZ-R7, EMC1072-1-ACZL-TR, EMC1072-A-ACZL-TR, EMC1402-1-ACZL-TR, EMC1402-2-ACZL-TR, EMC1402-3-ACZL-TR, and EMC1402-4-ACZL-TR provide expanded operating temperature ranges (-40°C to 125°C or -40°C to 120°C) while maintaining SMBus interface, 8-pin packaging, and core feature sets. These parts support applications requiring operation beyond the LM90CIMM's 0°C to 85°C range.

Alternative Architecture: ADM1032ARMZ-REEL offers remote and local temperature sensing via SMBus but with different internal specifications and active product status.

Parameter Comparison

Part Number	Manufacturer	Sensor Type	Local Temp Range	Remote Temp Range	Output Type	Supply Voltage	Resolution	Accuracy	Package	Product Status	RoHS Status
LM90CIMM	Texas Instruments	Digital, Local/Remote	0°C ~ 85°C	0°C ~ 85°C	SMBus	3V ~ 3.6V	7 b (Local), 10 b (Remote)	±4°C	8-VSSOP	Obsolete	RoHS non-compliant
LM90CIMM/NOPB	National Semiconductor	Digital, Local/Remote	0°C ~ 85°C	0°C ~ 85°C	SMBus	3V ~ 3.6V	7 b (Local), 10 b (Remote)	±4°C	8-VSSOP	Active	Not specified
ADT7461AARMZ-R	onsemi	Digital, Local/Remote	-40°C ~ 120°C	-64°C ~ 191°C	SMBus	3V ~ 3.6V	8 b	±1°C (±2.5°C)	8-MSOP	Active	ROHS3 Compliant
ADT7461ARMZ-R7	onsemi	Digital, Local/Remote	-40°C ~ 120°C	-55°C ~ 150°C	SMBus	3V ~ 5.5V	8 b	±3°C	8-MSOP	Active	ROHS3 Compliant
EMC1072-1-ACZL-TR	Microchip Technology	Digital, Local/Remote	-40°C ~ 125°C	-64°C ~ 191°C	SMBus	3V ~ 3.6V	11 b	±1°C (±2°C)	8-MSOP	Active	ROHS3 Compliant
EMC1072-A-ACZL-TR	Microchip Technology	Digital, Local/Remote	-40°C ~ 125°C	-64°C ~ 191°C	SMBus	3V ~ 3.6V	11 b	±1°C (±2°C)	8-TSSOP	Active	ROHS3 Compliant
EMC1402-1-ACZL-TR	Microchip Technology	Digital, Local/Remote	-40°C ~ 125°C	-64°C ~ 191°C	SMBus	3V ~ 3.6V	11 b	±1°C (±2°C)	8-MSOP	Active	ROHS3 Compliant
EMC1402-2-ACZL-TR	Microchip Technology	Digital, Local/Remote	-40°C ~ 125°C	-64°C ~ 191°C	SMBus	3V ~ 3.6V	11 b	±1°C (±2°C)	8-MSOP	Active	ROHS3 Compliant
EMC1402-3-ACZL-TR	Microchip Technology	Digital, Local/Remote	-40°C ~ 125°C	-64°C ~ 191°C	SMBus	3V ~ 3.6V	11 b	±1°C (±2°C)	8-MSOP	Active	ROHS3 Compliant
EMC1402-4-ACZL-TR	Microchip Technology	Digital, Local/Remote	-40°C ~ 125°C	-64°C ~ 191°C	SMBus	3V ~ 3.6V	11 b	±1°C (±2°C)	8-MSOP	Active	ROHS3 Compliant
ADM1032ARMZ-REEL	Analog Devices Inc.	Temperature Sensor	Not specified	Not specified	Not specified	Not specified	Not specified	Not specified	Not specified	Active	Not specified

Engineering Selection Recommendations

For Direct Replacement (0°C to 85°C Operating Range): LM90CIMM/NOPB is the primary equivalent, maintaining identical electrical specifications and operating temperature range. This part is active and suitable for applications requiring the original LM90CIMM functionality.

For Extended Temperature Applications (-40°C to 125°C): EMC1402 series (EMC1402-1-ACZL-TR, EMC1402-2-ACZL-TR, EMC1402-3-ACZL-TR, EMC1402-4-ACZL-TR) and EMC1072 series (EMC1072-1-ACZL-TR, EMC1072-A-ACZL-TR) provide expanded operating ranges with improved accuracy (±1°C to ±2°C) and higher resolution (11-bit). All are ROHS3 compliant and active products. Selection between these variants depends on packaging preference (8-MSOP vs. 8-TSSOP) and moisture sensitivity requirements.

For Extended Temperature with Wider Supply Voltage (3V to 5.5V): ADT7461ARMZ-R7 supports broader supply voltage range while maintaining SMBus interface and 8-MSOP packaging. This part is ROHS3 compliant and active.

For Improved Accuracy in Standard Temperature Range (-40°C to 120°C): ADT7461AARMZ-R offers ±1°C accuracy with 8-bit resolution, ROHS3 compliance, and active product status. Supply voltage remains 3V to 3.6V.

Compliance Consideration: All substitute parts except LM90CIMM/NOPB are ROHS3 compliant, addressing regulatory requirements for new designs. The original LM90CIMM is RoHS non-compliant.

Frequently Asked Questions (FAQ)

Q: Can LM90CIMM/NOPB be used as a direct replacement for LM90CIMM? A: Yes. LM90CIMM/NOPB maintains identical electrical and mechanical specifications, including sensor type, temperature ranges, SMBus output, supply voltage, resolution, and features. The difference is packaging format (Bulk vs. standard). This part is active and suitable for direct substitution.

Q: What is the primary difference between EMC1402 and EMC1072 series? A: Both series provide identical electrical specifications: -40°C to 125°C operating range, 11-bit resolution, ±1°C to ±2°C accuracy, and SMBus interface. The distinction is packaging: EMC1402 series uses 8-MSOP, while EMC1072-A-ACZL-TR uses 8-TSSOP. EMC1072-1-ACZL-TR also uses 8-MSOP. Moisture sensitivity levels vary (MSL 2 or 3 for EMC1072, MSL 1 or 2 for EMC1402).

Q: Can ADT7461ARMZ-R7 replace LM90CIMM in all applications? A: ADT7461ARMZ-R7 is compatible for SMBus-based systems requiring 8-MSOP packaging and SMBus interface. It extends operating temperature to -40°C to 120°C and supply voltage to 3V to 5.5V. However, accuracy is ±3°C compared to LM90CIMM's ±4°C, and resolution is 8-bit versus 7-bit local/10-bit remote. Verify application requirements before substitution.

Q: What does ROHS3 compliance mean for substitute parts? A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting lead, mercury, cadmium, and other hazardous materials. All substitute parts except LM90CIMM/NOPB are ROHS3 compliant, making them suitable for applications with regulatory compliance requirements.

Q: Why do EMC1402 variants have different part numbers (1, 2, 3, 4)? A: The variants differ in packaging format (Tape & Reel vs. Cut Tape) and moisture sensitivity level (MSL 1 or 2). All maintain identical electrical specifications. Selection depends on supply chain requirements and storage conditions.

Q: Is ADM1032ARMZ-REEL a suitable substitute? A: ADM1032ARMZ-REEL is an active alternative offering remote and local temperature sensing via SMBus. However, detailed electrical specifications (temperature ranges, resolution, accuracy) are not provided in the available data. Consult the manufacturer datasheet to confirm compatibility with specific application requirements before substitution.

Q: What packaging options are available for temperature sensor substitutes? A: Substitute parts use two primary 8-pin surface mount packages: 8-MSOP (0.118", 3.00mm Width) and 8-TSSOP (0.118", 3.00mm Width). Both are mechanically compatible with LM90CIMM's 8-VSSOP package footprint. Verify PCB layout compatibility before design implementation.

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