LM99CIMM Temperature Sensor Digital Equivalent & Substitute Parts

Part Overview

The LM99CIMM is a digital temperature sensor manufactured by Texas Instruments, designed for local and remote temperature monitoring applications. This component operates across a 0°C to 85°C sensing range with SMBus output interface and 3V to 3.6V supply voltage. The product is currently obsolete, making equivalent and substitute parts necessary for ongoing system support, maintenance, and new design implementations requiring compatible functionality.

Key Parameters

Parameter	LM99CIMM
Manufacturer	Texas Instruments
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), 11 b (Remote)
Accuracy	±3°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

Substitute parts for the LM99CIMM are grouped based on the following critical parameters that determine functional compatibility:

Primary Compatibility Criteria:

Output Type: SMBus interface
Voltage Supply Range: 3V ~ 3.6V
Mounting Type: Surface Mount
Package Compatibility: 8-TSSOP or 8-MSOP form factors
Sensor Type: Digital, Local/Remote configuration

Substitution Categories:

Direct Equivalent (Same Manufacturer): LM99CIMM/NOPB is a direct equivalent from Texas Instruments with identical electrical specifications and RoHS3 compliance upgrade.

Extended Temperature Range Substitutes (Microchip Technology): EMC1072-1-ACZL-TR, EMC1072-A-ACZL-TR, EMC1402 series (EMC1402-1-ACZL-TR, EMC1402-2-ACZL-TR, EMC1402-3-ACZL-TR, EMC1402-4-ACZL-TR), and EMC1422-1-ACZL-TR provide expanded operating temperature ranges (-40°C ~ 125°C) while maintaining SMBus interface, 3V ~ 3.6V supply voltage, and compatible 8-MSOP or 8-TSSOP packaging. These parts offer improved accuracy (±1°C to ±2°C) and active product status.

Parameter Comparison

Parameter	LM99CIMM	LM99CIMM/NOPB	EMC1072-1-ACZL-TR	EMC1072-A-ACZL-TR	EMC1402-1-ACZL-TR	EMC1402-2-ACZL-TR	EMC1402-3-ACZL-TR	EMC1402-4-ACZL-TR	EMC1422-1-ACZL-TR
Manufacturer	Texas Instruments	Texas Instruments	Microchip Technology	Microchip Technology	Microchip Technology	Microchip Technology	Microchip Technology	Microchip Technology	Microchip Technology
Sensor Type	Digital, Local/Remote	Digital, Local/Remote	Digital, Local/Remote	Digital, Local/Remote	Digital, Local/Remote	Digital, Local/Remote	Digital, Local/Remote	Digital, Local/Remote	Digital, Local/Remote
Sensing Temperature - Local	0°C ~ 85°C	0°C ~ 85°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Sensing Temperature - Remote	0°C ~ 85°C	0°C ~ 85°C	-64°C ~ 191°C	-64°C ~ 191°C	-64°C ~ 191°C	-64°C ~ 191°C	-64°C ~ 191°C	-64°C ~ 191°C	-64°C ~ 191°C
Output Type	SMBus	SMBus	SMBus	SMBus	SMBus	SMBus	SMBus	SMBus	SMBus
Voltage - Supply	3V ~ 3.6V	3V ~ 3.6V	3V ~ 3.6V	3V ~ 3.6V	3V ~ 3.6V	3V ~ 3.6V	3V ~ 3.6V	3V ~ 3.6V	3V ~ 3.6V
Resolution	7 b (Local), 11 b (Remote)	7 b (Local), 11 b (Remote)	11 b	11 b	11 b	11 b	11 b	11 b	11 b
Accuracy	±3°C	±3°C	±1°C (±2°C)	±1°C (±2°C)	±1°C (±2°C)	±1°C (±2°C)	±1°C (±2°C)	±1°C (±2°C)	±1°C (±2°C)
Operating Temperature	0°C ~ 125°C	0°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Package / Case	8-TSSOP, 8-MSOP	8-TSSOP, 8-MSOP	8-TSSOP, 8-MSOP	8-TSSOP, 8-MSOP	8-TSSOP, 8-MSOP	8-TSSOP, 8-MSOP	8-TSSOP, 8-MSOP	8-TSSOP, 8-MSOP	8-TSSOP, 8-MSOP
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Obsolete	Active	Active	Active	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	3 (168 Hours)	2 (1 Year)	2 (1 Year)	2 (1 Year)	1 (Unlimited)	1 (Unlimited)	2 (1 Year)

Engineering Selection Recommendations

For Direct Replacement (Obsolete Product Support): LM99CIMM/NOPB is the primary choice for direct substitution. This part maintains identical electrical specifications and pinout compatibility while providing ROHS3 compliance upgrade over the original LM99CIMM. Both parts are obsolete, but LM99CIMM/NOPB offers improved regulatory compliance for legacy system maintenance.

For New Designs and Extended Temperature Applications: The Microchip Technology EMC1072 and EMC1402 series parts are recommended for applications requiring active product status and extended operating temperature ranges. These parts provide:

Active product status ensuring long-term availability
ROHS3 compliance for regulatory requirements
Improved accuracy specifications (±1°C to ±2°C versus ±3°C)
Extended temperature sensing capability (-40°C ~ 125°C local, -64°C ~ 191°C remote)
Compatible SMBus interface and 3V ~ 3.6V supply voltage
Identical 8-MSOP and 8-TSSOP packaging options

Packaging and Moisture Sensitivity Considerations: EMC1402-3-ACZL-TR and EMC1402-4-ACZL-TR offer MSL 1 (Unlimited) rating, matching the original LM99CIMM moisture sensitivity level. EMC1072-1-ACZL-TR carries MSL 3 (168 Hours), requiring controlled storage conditions. All other substitute parts carry MSL 2 (1 Year) ratings.

Frequently Asked Questions (FAQ)

Q: Can EMC1072 and EMC1402 series parts directly replace LM99CIMM in existing designs? A: Yes, provided the application does not depend on the specific 7-bit local resolution of the LM99CIMM. The EMC series parts provide 11-bit resolution for both local and remote sensing, which is functionally compatible with SMBus interface designs. Pinout and package compatibility (8-MSOP, 8-TSSOP) are identical.

Q: What is the primary difference between EMC1072 and EMC1402 series? A: Both series maintain identical electrical specifications, SMBus interface, and package options. The primary distinction is product availability and packaging format options. EMC1402 series offers higher inventory levels and multiple packaging variants (Cut Tape and Tape & Reel options).

Q: Why do some substitute parts have different accuracy specifications? A: The LM99CIMM specifies ±3°C accuracy, while Microchip EMC series parts specify ±1°C to ±2°C accuracy. This represents an improvement in measurement precision. Applications requiring the original ±3°C specification can still use these parts, as they meet or exceed the original accuracy requirement.

Q: Are there compatibility concerns with the extended temperature range of substitute parts? A: No. The LM99CIMM operates from 0°C ~ 85°C (local/remote). Substitute parts with -40°C ~ 125°C ranges are backward compatible with this specification. The extended range provides additional capability for applications requiring broader temperature monitoring without affecting compatibility with existing designs.

Q: What packaging format should be selected for new production? A: EMC1402-1-ACZL-TR (8-MSOP, Tape & Reel) or EMC1402-2-ACZL-TR (8-MSOP, Cut Tape) are recommended for new designs based on production volume and assembly requirements. Both maintain active product status and ROHS3 compliance.

Q: Does moisture sensitivity level affect component selection? A: Moisture sensitivity level (MSL) determines storage and handling requirements. MSL 1 (Unlimited) parts like EMC1402-3-ACZL-TR and EMC1402-4-ACZL-TR require no special storage conditions. MSL 2 and MSL 3 parts require controlled humidity storage. Select based on your supply chain and manufacturing environment capabilities.

Q: Is LM99CIMM/NOPB recommended for new designs? A: No. Although LM99CIMM/NOPB is a direct equivalent with improved RoHS compliance, it carries obsolete product status. For new designs, select from the active Microchip EMC series parts to ensure long-term component availability and supply chain stability.

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