LM64CILQ-F Equivalent & Substitute Parts

Part Overview

The LM64CILQ-F is a remote temperature sensor IC designed for fan control and thermal monitoring applications. It integrates internal and external temperature sensing with 2-Wire SMBus communication, enabling real-time thermal management in embedded systems. The device operates across a supply voltage range of 3V to 3.6V and supports dual temperature monitoring with independent alarm outputs and fan speed control functionality.

The LM64CILQ-F is classified as obsolete. Identifying equivalent substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support long-term product availability for systems currently utilizing this component.

Substiute Parts

LM64CILQ-F

Texas InstrumentsIn Stock: 89333LM64CILQ-F Datasheet

Current PartRFQ

LM64CILQ-F/NOPB

Texas InstrumentsIn Stock: 3469LM64CILQ-F/NOPB Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LM64CILQ-F is determined by strict equivalence across the following critical parameters:

• Functional Equivalence: Fan control and temperature monitoring capability with internal and external sensor support
• Electrical Specifications: Identical supply voltage range (3V ~ 3.6V), temperature sensing range (0°C ~ 85°C, 25°C ~ 140°C), and measurement accuracy (±1°C Local, ±3°C Remote)
• Interface Compatibility: 2-Wire SMBus communication protocol with alarm and fan control outputs
• Package Compatibility: 24-WFQFN Exposed Pad surface mount package with identical pinout and mechanical dimensions
• Topology: Sigma Delta ADC, comparator, fan speed control, and register bank architecture

The LM64CILQ-F/NOPB qualifies as a direct substitute based on complete parameter alignment across all electrical, functional, and mechanical specifications.

Parameter Comparison

Engineering Selection Recommendations

The LM64CILQ-F/NOPB is the direct substitute for the obsolete LM64CILQ-F. Both parts share identical electrical specifications, functional capabilities, and package geometry, ensuring pin-for-pin compatibility and drop-in replacement capability.

The LM64CILQ-F/NOPB offers the following advantages for new designs and supply chain continuity:

• Active Product Status: Currently manufactured and supported by Texas Instruments, ensuring long-term availability and supply chain stability
• ROHS3 Compliance: Meets current environmental and regulatory requirements, whereas the original LM64CILQ-F is RoHS non-compliant
• Tape & Reel Packaging: Standard production format suitable for automated assembly processes
• Identical Electrical Performance: No design modifications required; existing firmware, PCB layouts, and thermal management strategies remain valid

The increased Moisture Sensitivity Level (MSL 3 vs. MSL 1) requires adherence to standard moisture handling procedures during storage and assembly, consistent with industry practices for surface mount components.

Frequently Asked Questions (FAQ)

Q: Can the LM64CILQ-F/NOPB replace the LM64CILQ-F in existing designs?

A: Yes. The LM64CILQ-F/NOPB is a direct substitute with identical pinout, electrical specifications, and functional performance. No circuit modifications or firmware changes are required.

Q: What is the difference between LM64CILQ-F and LM64CILQ-F/NOPB?

A: The primary differences are product status, packaging format, and compliance certifications. The LM64CILQ-F is obsolete and supplied in bulk; the LM64CILQ-F/NOPB is active, supplied in Tape & Reel format, and ROHS3 compliant. Electrical and functional specifications are identical.

Q: Are there any compatibility concerns with the 24-WFQFN package?

A: No. Both parts use the identical 24-WFQFN Exposed Pad package with 4x5mm dimensions. PCB footprints, solder reflow profiles, and thermal management designs require no modification.

Q: What does the "/NOPB" suffix indicate?

A: The "/NOPB" suffix indicates the part is supplied in Tape & Reel (TR) packaging without plumbum (lead-free), meeting ROHS3 environmental standards.

Q: How should the LM64CILQ-F/NOPB be stored given its MSL 3 rating?

A: MSL 3 components must be stored in controlled humidity environments (typically ≤30% relative humidity) and used within 168 hours of package opening. Standard moisture barrier bags with desiccant are recommended for long-term storage.

Q: Is the 2-Wire SMBus interface identical between both parts?

A: Yes. Both parts implement identical 2-Wire SMBus communication protocol, alarm output functionality, and fan speed control logic. Software drivers and register definitions remain unchanged.