LM99-1CIMM Equivalent & Substitute Parts

Part Overview

The LM99-1CIMM is a digital temperature sensor manufactured by Texas Instruments, designed for local and remote temperature monitoring across 0°C to 85°C. The device features SMBus output, 7-bit local and 11-bit remote resolution, and operates on 3V to 3.6V supply voltage. The LM99-1CIMM is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. Substitute parts must maintain compatibility with SMBus protocol, matching package footprint (8-VSSOP/8-MSOP), and core functional parameters.

Key Parameters

Parameter	LM99-1CIMM Value
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
Package / Case	8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
Mounting Type	Surface Mount
Operating Temperature	0°C ~ 125°C

Substitute Part Grouping Explanation

Substitute parts for the LM99-1CIMM are grouped based on the following critical parameters that determine functional compatibility:

Primary Substitution Criteria:

SMBus output protocol compatibility
8-pin surface mount package (8-VSSOP, 8-MSOP, or 8-TSSOP)
Digital local/remote temperature sensing capability
Supply voltage range overlap with 3V to 3.6V
Resolution of 11 bits for remote sensing (matching or exceeding LM99-1CIMM capability)

Grouping Logic:

Direct Equivalent (LM99-1CIMM/NOPB): Identical specifications with active product status and improved RoHS compliance
Extended Temperature Range Substitutes (EMC1402 series, EMC1072 series, EMC1422-1-ACZL-TR): Microchip Technology parts with -40°C to 125°C operating range, maintaining 11-bit remote resolution and SMBus interface
Broader Compatibility Substitutes (ADT7461ARMZ-R7): onsemi part with extended temperature range (-40°C to 120°C) and 8-bit resolution, compatible supply voltage (3V to 5.5V)
Alternative Manufacturer (ADM1032ARMZ-REEL): Analog Devices remote and local temperature sensor with active status

Parameter Comparison

Parameter	LM99-1CIMM	LM99-1CIMM/NOPB	EMC1402-1-ACZL-TR	EMC1402-2-ACZL-TR	EMC1402-4-ACZL-TR	EMC1072-1-ACZL-TR	EMC1422-1-ACZL-TR	ADT7461ARMZ-R7
Manufacturer	Texas Instruments	Texas Instruments	Microchip Technology	Microchip Technology	Microchip Technology	Microchip Technology	Microchip Technology	onsemi
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
Output Type	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 ~ 5.5V
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 ~ 120°C
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 ~ 120°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	-55°C ~ 150°C
Resolution	7 b (Local), 11 b (Remote)	7 b (Local), 11 b (Remote)	11 b	11 b	11 b	11 b	11 b	8 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)	±3°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
Product Status	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

Engineering Selection Recommendations

LM99-1CIMM/NOPB is the primary direct substitute. It maintains identical electrical specifications and package compatibility while offering active product status and ROHS3 compliance, addressing the obsolescence of the original LM99-1CIMM.

EMC1402 series (EMC1402-1-ACZL-TR, EMC1402-2-ACZL-TR, EMC1402-4-ACZL-TR) provides extended operating temperature range (-40°C to 125°C) with improved accuracy (±1°C to ±2°C) and 11-bit resolution. These parts are suitable for applications requiring broader temperature monitoring beyond the LM99-1CIMM's 0°C to 85°C local sensing range. Packaging options include Tape & Reel and Cut Tape formats.

EMC1072-1-ACZL-TR and EMC1072-A-ACZL-TR offer identical functional parameters to the EMC1402 series with alternative packaging (8-MSOP and 8-TSSOP respectively). Selection depends on assembly line requirements and moisture sensitivity tolerance (MSL 3 for EMC1072-1-ACZL-TR versus MSL 2 for EMC1072-A-ACZL-TR).

EMC1422-1-ACZL-TR maintains the same temperature range and resolution as EMC1402 series but with reduced feature set (Output Switch, Programmable Limit, Shutdown Mode without One-Shot capability). This part is suitable for cost-optimized designs where One-Shot functionality is not required.

ADT7461ARMZ-R7 from onsemi provides an alternative with 8-bit resolution and extended supply voltage range (3V to 5.5V). The broader operating temperature range (-40°C to 120°C) and higher remote sensing range (-55°C to 150°C) make this suitable for applications requiring greater thermal monitoring flexibility.

ADM1032ARMZ-REEL from Analog Devices is available with high inventory (25,077 pcs) and active status. Detailed parameter specifications are limited in the provided data; verification of functional compatibility with SMBus protocol and package footprint is required before selection.

Frequently Asked Questions (FAQ)

Q: Can LM99-1CIMM/NOPB be used as a direct replacement for LM99-1CIMM?

A: Yes. LM99-1CIMM/NOPB is electrically and mechanically identical to LM99-1CIMM, with the primary differences being active product status and ROHS3 compliance. The part number suffix "/NOPB" indicates Tape & Reel packaging format.

Q: What is the key difference between EMC1402 and EMC1072 series?

A: Both series share identical electrical specifications (11-bit resolution, ±1°C to ±2°C accuracy, -40°C to 125°C operating range). The primary difference is moisture sensitivity level: EMC1072-1-ACZL-TR has MSL 3 (168 hours), while EMC1072-A-ACZL-TR has MSL 2 (1 year). Selection depends on storage and assembly conditions.

Q: Why do EMC1402 variants have different part numbers (EMC1402-1, -2, -3, -4)?

A: The numeric suffix indicates packaging format and moisture sensitivity level. EMC1402-1-ACZL-TR and EMC1402-4-ACZL-TR are Tape & Reel with MSL 1 (Unlimited). EMC1402-2-ACZL-TR is Cut Tape with MSL 2 (1 year). EMC1402-3-ACZL-TR is Tape & Reel with MSL 1. Selection depends on assembly process requirements and storage conditions.

Q: Is ADT7461ARMZ-R7 compatible with 3V to 3.6V supply voltage?

A: Yes. ADT7461ARMZ-R7 operates across 3V to 5.5V supply voltage range, which encompasses the LM99-1CIMM's 3V to 3.6V requirement. The extended upper voltage limit provides additional design flexibility.

Q: What is the significance of the 8-pin package compatibility?

A: All substitute parts use 8-pin surface mount packages (8-VSSOP, 8-MSOP, or 8-TSSOP) with 0.118" (3.00mm) width. This ensures mechanical and electrical pin compatibility, allowing direct PCB footprint reuse without layout modifications.

Q: Can EMC1422-1-ACZL-TR replace EMC1402 series in all applications?

A: EMC1422-1-ACZL-TR lacks One-Shot functionality compared to EMC1402 series. Substitution is valid only for applications that do not require One-Shot operation. All other parameters (temperature range, resolution, accuracy, SMBus interface) remain compatible.

Q: Why is LM99-1CIMM classified as obsolete?

A: Obsolete status indicates the manufacturer has discontinued production. LM99-1CIMM/NOPB (active status) or equivalent Microchip Technology parts (EMC1402, EMC1072, EMC1422 series) are recommended for new designs and ongoing production to ensure long-term supply availability.

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