LM87CIMTX Equivalent & Substitute Parts

Part Overview

The LM87CIMTX is a hardware monitor integrated circuit manufactured by Texas Instruments, designed for system monitoring applications. It provides internal and external temperature sensing with 2-Wire Serial I2C/SMBUS output interface, operating across -40°C to 125°C. The device integrates an ADC with sigma-delta topology, comparator, fan speed counter, and register bank for comprehensive system health monitoring.

The LM87CIMTX carries a "Not For New Designs" product status, indicating it is a legacy component. Identifying equivalent substitute parts is necessary for ongoing production support, maintenance applications, and design continuity where this device is already deployed.

Substiute Parts

LM87CIMTX

Texas InstrumentsIn Stock: 30346LM87CIMTX Datasheet

Current PartRFQ

LM87CIMTX/NOPB

Texas InstrumentsIn Stock: 15399LM87CIMTX/NOPB Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LM87CIMTX is determined by strict parametric equivalence across the following critical criteria:

• Identical function as hardware monitor with internal and external temperature sensing
• Matching sensor temperature range (-40°C to 125°C)
• Equivalent temperature accuracy specifications (±3°C Local, ±4°C Remote)
• Identical output interface (2-Wire Serial I2C/SMBUS)
• Matching supply voltage range (2.8V to 3.8V)
• Identical package and pinout (24-TSSOP)
• Equivalent internal topology (ADC, Comparator, Fan Speed Counter, Register Bank)

The LM87CIMTX/NOPB qualifies as a parametric equivalent substitute, meeting all electrical and mechanical requirements for direct replacement in existing applications.

Parameter Comparison

Engineering Selection Recommendations

The LM87CIMTX/NOPB is the direct parametric equivalent for the LM87CIMTX. Both devices share identical electrical specifications, functional capabilities, and package configuration, enabling pin-for-pin replacement in existing designs.

The primary distinction between these parts is product lifecycle status and regulatory compliance. The LM87CIMTX carries "Not For New Designs" designation, while the LM87CIMTX/NOPB maintains Active status. Additionally, the LM87CIMTX/NOPB achieves ROHS3 compliance, whereas the LM87CIMTX is RoHS non-compliant.

For applications requiring ongoing component availability and regulatory compliance with modern standards, the LM87CIMTX/NOPB is the appropriate selection. For legacy system maintenance where the original LM87CIMTX specification must be preserved, both parts deliver equivalent performance.

Frequently Asked Questions (FAQ)

Q: Can the LM87CIMTX/NOPB replace the LM87CIMTX in existing designs?

A: Yes. The LM87CIMTX/NOPB is a parametric equivalent with identical electrical specifications, temperature range, accuracy, output interface, supply voltage, and 24-TSSOP package. Direct substitution is supported without circuit modification.

Q: What is the difference between LM87CIMTX and LM87CIMTX/NOPB?

A: The devices are electrically and functionally identical. The primary differences are product status (Not For New Designs vs. Active) and RoHS compliance (non-compliant vs. ROHS3 compliant). The "/NOPB" suffix indicates lead-free, RoHS-compliant packaging.

Q: Are there any package or pinout differences?

A: No. Both parts use the 24-TSSOP package with identical pinout and mechanical dimensions (0.173", 4.40mm width). PCB layout and footprint compatibility is maintained.

Q: What temperature range do these devices support?

A: Both the LM87CIMTX and LM87CIMTX/NOPB operate across -40°C to 125°C with temperature accuracy of ±3°C for local sensing (typical) and ±4°C for remote sensing (maximum).

Q: What is the I2C/SMBUS interface specification?

A: Both devices provide 2-Wire Serial I2C/SMBUS output interface for system communication and monitoring data transmission. The interface operates within the specified 2.8V to 3.8V supply voltage range.

Q: Which part should be selected for new production?

A: The LM87CIMTX/NOPB is the appropriate selection for new production due to Active product status and ROHS3 compliance. The LM87CIMTX is designated "Not For New Designs" and should be reserved for legacy system support only.