LM89CIMX Temperature Sensor Equivalent & Substitute Parts

Part Overview

The LM89CIMX is a digital temperature sensor manufactured by Texas Instruments, designed for local and remote temperature monitoring across the 0°C to 85°C range. This component features SMBus output, 7-bit local and 10-bit remote resolution, and operates on 3V to 3.6V supply voltage. The product is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations.

Substiute Parts

LM89CIMX

Texas InstrumentsIn Stock: 1005LM89CIMX Datasheet

Current PartRFQ

LM89CIMX/NOPB

National SemiconductorIn Stock: 3568LM89CIMX/NOPB Datasheet

DirectRFQ

SA56004AD,118

NXP USA Inc.In Stock: 1119SA56004AD,118 Datasheet

MFR RecommendedRFQ

SA56004CD,118

NXP SemiconductorsIn Stock: 2279SA56004CD,118 Datasheet

MFR RecommendedRFQ

SA56004ED,118

NXP USA Inc.In Stock: 2004SA56004ED,118 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LM89CIMX is determined by the following critical parameters:

Primary Compatibility Criteria:

• Sensor type: Digital, Local/Remote configuration
• Output interface: SMBus or I2C/SMBus compatibility
• Package form factor: 8-SOIC (0.154", 3.90mm Width)
• Mounting type: Surface Mount

Functional Overlap Parameters:

• Temperature sensing capability across the 0°C to 85°C operational window
• Resolution specifications: minimum 7-bit local and 10-bit remote capability
• Accuracy tolerance: ±3°C or better
• Supply voltage compatibility within the 3V to 3.6V range

The substitute parts identified—LM89CIMX/NOPB, SA56004AD,118, SA56004CD,118, and SA56004ED,118—meet these core criteria. The SA56004 series parts extend the operating temperature range to -40°C to 125°C and support expanded supply voltage (3V to 5.5V), providing broader application flexibility while maintaining package and interface compatibility.

Parameter Comparison

Engineering Selection Recommendations

LM89CIMX/NOPB is the direct functional equivalent with active product status. This part maintains identical electrical specifications and package form factor, making it the primary replacement for applications requiring the original 0°C to 85°C temperature range and 3V to 3.6V supply voltage. The NOPB designation indicates lead-free compliance.

SA56004 Series (AD, CD, ED variants) represents manufacturer-recommended alternatives offering extended operational capabilities. These NXP parts support -40°C to 125°C temperature sensing and 3V to 5.5V supply voltage, providing design flexibility for applications requiring broader environmental tolerance. All SA56004 variants are ROHS3 compliant, addressing regulatory requirements that the original LM89CIMX does not meet. The SA56004 series maintains I2C/SMBus compatibility and 8-SOIC packaging, ensuring mechanical and electrical interchangeability.

Selection between LM89CIMX/NOPB and SA56004 variants depends on application temperature range requirements and regulatory compliance mandates. For legacy system support within the original 0°C to 85°C specification, LM89CIMX/NOPB is appropriate. For new designs or systems requiring extended temperature operation and RoHS compliance, SA56004 series parts are preferred.

Frequently Asked Questions (FAQ)

Q: Can SA56004 parts directly replace LM89CIMX in existing designs?

A: Yes, within the original 0°C to 85°C operating window. SA56004 parts are pin-compatible in 8-SOIC packaging and support SMBus/I2C communication. The extended temperature range and supply voltage specifications do not affect operation within the LM89CIMX's original parameters.

Q: What is the difference between SA56004AD, SA56004CD, and SA56004ED variants?

A: These variants are functionally equivalent. Differences are limited to manufacturer designation and packaging configuration (Tape & Reel). All three maintain identical electrical specifications, temperature ranges, and accuracy ratings.

Q: Is LM89CIMX/NOPB identical to the original LM89CIMX?

A: LM89CIMX/NOPB is the lead-free version of the original part. Electrical and functional specifications are identical. The NOPB designation indicates compliance with lead-free soldering requirements.

Q: Why do SA56004 parts show ±2°C (±3°C) accuracy instead of ±3°C?

A: SA56004 accuracy is specified as ±2°C across the 60°C to 100°C test condition range and ±3°C across the full -40°C to 125°C operating range. Within the LM89CIMX's original 0°C to 85°C window, SA56004 parts deliver ±2°C accuracy, representing improved performance.

Q: Are all substitute parts available in the same packaging?

A: Yes. All identified substitutes use 8-SOIC (0.154", 3.90mm Width) surface mount packaging, ensuring mechanical compatibility with existing PCB layouts and assembly processes.

Q: What supply voltage should be used when substituting with SA56004 parts?

A: SA56004 parts support 3V to 5.5V operation. For direct replacement in systems designed for 3V to 3.6V, maintain the original supply voltage. The expanded voltage range allows flexibility for future design modifications but does not require voltage changes for compatibility.