LM89-1CIMM Equivalent & Substitute Parts

Part Overview

The LM89-1CIMM 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 10-bit remote resolution, and operates on 3V to 3.6V supply voltage. This part is classified as obsolete, making equivalent substitutes necessary for new designs and ongoing production requirements. The NXP SA56004 series provides direct functional equivalents with extended temperature range and active product status.

Key Parameters

Parameter	LM89-1CIMM
Manufacturer	Texas Instruments
Sensor Type	Digital, Local/Remote
Sensing Temperature Range	0°C ~ 85°C (Local & Remote)
Output Type	SMBus
Supply Voltage	3V ~ 3.6V
Resolution	7 b (Local), 10 b (Remote)
Accuracy	±3°C
Package Type	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 of the LM89-1CIMM is based on the following critical parameters:

Mechanical Compatibility: All substitute parts maintain the 8-TSSOP/8-MSOP package format with identical 0.118" (3.00mm) width, ensuring direct PCB footprint compatibility.

Functional Equivalence: Substitute parts retain digital local/remote temperature sensing capability with SMBus/I2C protocol compatibility, preserving system-level communication protocols.

Electrical Parameters: Substitute parts operate within the LM89-1CIMM supply voltage range (3V minimum) and extend to 5.5V maximum, providing broader application flexibility while maintaining backward compatibility.

Resolution & Accuracy: All SA56004 variants provide 10-bit resolution (exceeding the LM89-1CIMM's 7-bit local resolution) with ±2°C to ±3°C accuracy specifications, meeting or surpassing the original part's performance.

Temperature Range: Substitute parts extend the sensing range to -40°C ~ 125°C, covering the LM89-1CIMM's 0°C ~ 85°C range and providing additional operational headroom.

Parameter Comparison

Parameter	LM89-1CIMM	SA56004ADP,118	SA56004CDP,118	SA56004EDP,118
Manufacturer	Texas Instruments	NXP USA Inc.	NXP USA Inc.	NXP USA Inc.
Sensor Type	Digital, Local/Remote	Digital, Local/Remote	Digital, Local/Remote	Digital, Local/Remote
Sensing Temperature Range	0°C ~ 85°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Output Type	SMBus	I2C/SMBus	I2C/SMBus	I2C/SMBus
Supply Voltage	3V ~ 3.6V	3V ~ 5.5V	3V ~ 5.5V	3V ~ 5.5V
Resolution	7 b (Local), 10 b (Remote)	10 b	10 b	10 b
Accuracy	±3°C	±2°C (±3°C)	±2°C (±3°C)	±2°C (±3°C)
Package Type	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
Product Status	Obsolete	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging Option	-	Tape & Reel (TR)	Tape & Reel (TR)	Cut Tape (CT) & Digi-Reel®

Engineering Selection Recommendations

Product Status Consideration: The LM89-1CIMM is obsolete, while all SA56004 variants maintain active product status with ongoing manufacturer support and availability. Active status ensures long-term supply chain reliability and technical support.

Compliance & Certification: All SA56004 substitute parts are ROHS3 compliant and REACH unaffected, meeting modern regulatory requirements. The original LM89-1CIMM is RoHS non-compliant, making substitution necessary for applications requiring regulatory compliance.

Packaging & Supply Chain: SA56004EDP,118 offers the highest inventory availability (16,007 pcs) with Cut Tape and Digi-Reel® packaging options, supporting both prototype and production workflows. SA56004ADP,118 and SA56004CDP,118 provide Tape & Reel packaging for high-volume manufacturing.

Electrical Compatibility: All SA56004 variants operate within the LM89-1CIMM's 3V minimum supply voltage and extend to 5.5V, ensuring direct integration into existing 3.3V and 5V systems without additional design modifications.

Frequently Asked Questions (FAQ)

Q: Can SA56004 parts directly replace LM89-1CIMM in existing designs?

A: Yes. The SA56004 series maintains identical 8-TSSOP/8-MSOP package geometry, SMBus/I2C protocol compatibility, and operates within the LM89-1CIMM's 3V supply voltage range. No PCB layout changes are required.

Q: What are the key differences between SA56004ADP,118, SA56004CDP,118, and SA56004EDP,118?

A: All three variants are functionally identical in electrical and thermal specifications. The differences are packaging format and inventory availability. SA56004EDP,118 uses Cut Tape & Digi-Reel® packaging with highest stock (16,007 pcs). SA56004ADP,118 and SA56004CDP,118 use Tape & Reel packaging with lower inventory levels.

Q: Does the extended temperature range of SA56004 parts affect compatibility?

A: No. The SA56004 series extends the sensing range to -40°C ~ 125°C, which encompasses the LM89-1CIMM's 0°C ~ 85°C range. This provides additional operational margin without affecting existing applications.

Q: Are there any supply voltage considerations when substituting?

A: The SA56004 series supports 3V ~ 5.5V, compared to the LM89-1CIMM's 3V ~ 3.6V. Systems operating at 3.3V or 5V will function correctly with SA56004 parts. No voltage regulation changes are necessary.

Q: What is the impact of improved accuracy in SA56004 parts?

A: SA56004 parts provide ±2°C to ±3°C accuracy, matching or exceeding the LM89-1CIMM's ±3°C specification. This represents an improvement in measurement precision with no negative impact on system compatibility.

Q: Why is RoHS compliance important for this substitution?

A: RoHS3 compliance in SA56004 parts meets current environmental and regulatory standards required for commercial and industrial applications. The LM89-1CIMM's non-compliance status makes substitution necessary for new designs and regulated markets.

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