LM90CIMMX Temperature Sensor Equivalent & Substitute Parts

Part Overview

The LM90CIMMX 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 design support and procurement.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Part Number	LM90CIMMX
Category	Temperature Sensors
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)
Accuracy	±4°C
Operating Temperature	0°C ~ 125°C
Package / Case	8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution for the LM90CIMMX is determined by the following critical parameters:

Primary Compatibility Criteria:

Sensor Type: Digital, Local/Remote
Output Type: SMBus
Package / Case: 8-TSSOP or 8-MSOP (0.118", 3.00mm Width)
Mounting Type: Surface Mount
Supply Voltage Range: Must encompass or match 3V ~ 3.6V

Secondary Compatibility Criteria:

Local and Remote temperature sensing capability
Resolution: 7-bit minimum for local, 10-bit minimum for remote
Accuracy: ±4°C or better
Features: One-Shot, Output Switch, Programmable Limit, Standby Mode

Substitute parts are grouped into two categories:

Direct Equivalents: Parts maintaining identical or superior specifications within the original operating range (0°C ~ 85°C local sensing).

Extended-Range Substitutes: Parts with expanded temperature ranges and improved specifications, suitable for applications requiring broader operating conditions while maintaining backward compatibility through SMBus interface and identical packaging.

Parameter Comparison

Part Number	Manufacturer	Sensor Type	Local Temp Range	Remote Temp Range	Output Type	Supply Voltage	Resolution	Accuracy	Package	Product Status	RoHS Status
LM90CIMMX	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
LM90CIMMX/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

Engineering Selection Recommendations

Direct Equivalent (Recommended for Legacy Support): LM90CIMMX/NOPB maintains identical electrical specifications and packaging to the original LM90CIMMX. This part is currently in active production status, providing the most straightforward replacement path for existing designs. Electrical compatibility is complete across all critical parameters.

Extended-Range Substitutes (Recommended for New Designs): The Microchip EMC1402 series (EMC1402-1-ACZL-TR, EMC1402-2-ACZL-TR, EMC1402-3-ACZL-TR, EMC1402-4-ACZL-TR) and EMC1072 series offer superior specifications with active product status and ROHS3 compliance. These parts provide 11-bit resolution versus the original 7/10-bit split, improved accuracy (±1°C to ±2°C versus ±4°C), and extended operating temperature ranges (-40°C to 125°C). All maintain SMBus interface compatibility and 8-MSOP or 8-TSSOP packaging. The EMC1402 variants differ only in packaging format (Tape & Reel or Cut Tape) and moisture sensitivity levels.

Alternative Extended-Range Option: The onsemi ADT7461AARMZ-R provides 8-bit resolution, ±1°C accuracy, and -40°C to 120°C local operating range with active status and ROHS3 compliance. The ADT7461ARMZ-R7 variant extends supply voltage tolerance to 5.5V, accommodating broader power supply specifications.

Compliance Consideration: All recommended substitutes except LM90CIMMX/NOPB carry ROHS3 compliance certification, addressing regulatory requirements for new product designs. The original LM90CIMMX is RoHS non-compliant.

Frequently Asked Questions (FAQ)

Q: Can LM90CIMMX/NOPB be used as a direct replacement? A: Yes. LM90CIMMX/NOPB is electrically and mechanically identical to LM90CIMMX, with matching 0°C to 85°C local sensing range, ±4°C accuracy, 7/10-bit resolution, SMBus output, and 8-VSSOP packaging. The primary difference is active production status versus obsolete status.

Q: What are the key differences between EMC1402 variants? A: EMC1402-1-ACZL-TR, EMC1402-2-ACZL-TR, EMC1402-3-ACZL-TR, and EMC1402-4-ACZL-TR are electrically identical. Differences exist only in packaging format (Tape & Reel versus Cut Tape) and moisture sensitivity level (MSL 1 or MSL 2). All provide 11-bit resolution, ±1°C to ±2°C accuracy, and -40°C to 125°C operating range.

Q: Is the 8-TSSOP package compatible with 8-MSOP footprints? A: Both 8-TSSOP and 8-MSOP are 0.118" width packages with identical pin pitch and electrical connectivity. EMC1072-A-ACZL-TR uses 8-TSSOP while other EMC1402 variants use 8-MSOP. Footprint compatibility depends on PCB design; verify mechanical dimensions before substitution.

Q: Why do EMC1402 and EMC1072 parts have higher resolution than the original? A: The EMC1402 and EMC1072 series provide 11-bit resolution compared to the original 7-bit local and 10-bit remote split. This is a specification enhancement in the substitute parts, not a limitation. Designs using the original 7/10-bit output remain compatible with 11-bit output through SMBus protocol.

Q: What is the supply voltage range for each substitute? A: LM90CIMMX/NOPB, ADT7461AARMZ-R, EMC1072 series, and EMC1402 series all operate on 3V to 3.6V, matching the original. ADT7461ARMZ-R7 extends this to 3V to 5.5V, providing broader supply tolerance.

Q: Are all substitutes RoHS compliant? A: LM90CIMMX/NOPB compliance status is not specified. All onsemi ADT7461 variants and Microchip EMC1072/EMC1402 series carry ROHS3 compliance certification. The original LM90CIMMX is RoHS non-compliant.

Q: Which substitute offers the best accuracy? A: EMC1072 series and EMC1402 series provide ±1°C accuracy at best case, with ±2°C worst case, compared to the original ±4°C. ADT7461AARMZ-R matches this at ±1°C best case (±2.5°C worst case). ADT7461ARMZ-R7 provides ±3°C accuracy.

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