74LCX646WM Equivalent & Substitute Parts

Part Overview

The 74LCX646WM is a non-inverting transceiver IC manufactured by onsemi, designed for 8-bit bidirectional data transfer with 3-state output capability. This component operates across a 2V to 3.6V supply voltage range and is housed in a 24-SOP surface mount package. The part is currently classified as obsolete, making identification of compatible substitute components essential for ongoing system support and new design implementations.

Substiute Parts

74LCX646WM

onsemiIn Stock: 80874LCX646WM Datasheet

Current PartRFQ

SN74LVC646ADW

Texas InstrumentsIn Stock: 1302SN74LVC646ADW Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 74LCX646WM is determined by strict alignment of the following critical parameters:

• Logic type and function: Non-inverting transceiver configuration
• Bit width and element count: 1 element with 8 bits per element
• Output architecture: 3-state output capability
• Output current specifications: 24mA for both high and low states
• Supply voltage range: Minimum 2V operation required
• Package form factor: 24-SOIC surface mount package
• Operating temperature range: -40°C to 85°C

The SN74LVC646ADW from Texas Instruments meets all substitution criteria. While the SN74LVC646ADW operates across an extended lower voltage range (1.65V ~ 3.6V), it maintains full compatibility with the 74LCX646WM's minimum operating voltage of 2V and above, ensuring functional equivalence in existing 74LCX646WM applications.

Parameter Comparison

Engineering Selection Recommendations

The SN74LVC646ADW is the qualified substitute for the 74LCX646WM based on the following factors:

Functional Equivalence: Both components implement identical transceiver logic with matching bit widths, element counts, and output drive specifications.

Package Compatibility: Both parts use the 24-SOIC surface mount package with identical physical dimensions, enabling direct PCB footprint compatibility without layout modifications.

Voltage Range Compatibility: The SN74LVC646ADW's extended lower voltage specification (1.65V minimum) encompasses the 74LCX646WM's 2V minimum requirement, ensuring operation across all original design voltage ranges.

Product Status Advantage: The SN74LVC646ADW maintains active production status with established supply chains, addressing the obsolescence of the 74LCX646WM.

Compliance and Certification: Both components carry identical REACH and ECCN classifications, maintaining regulatory compliance in existing applications.

Frequently Asked Questions (FAQ)

Q: Can the SN74LVC646ADW directly replace the 74LCX646WM without PCB modifications?

A: Yes. Both components share identical 24-SOIC package dimensions and pinout configurations. Direct socket substitution is possible without PCB layout changes.

Q: Are there voltage compatibility concerns when substituting the SN74LVC646ADW?

A: No. The SN74LVC646ADW operates across 1.65V to 3.6V, which fully encompasses the 74LCX646WM's 2V to 3.6V operating range. Systems designed for the 74LCX646WM will function identically with the substitute.

Q: What is the primary reason for seeking a substitute for the 74LCX646WM?

A: The 74LCX646WM is classified as obsolete. The SN74LVC646ADW provides functional equivalence with active production status and established supply availability.

Q: Do the output current specifications match between these components?

A: Yes. Both the 74LCX646WM and SN74LVC646ADW deliver 24mA output current for both high and low states, ensuring identical drive capability.

Q: Are there differences in operating temperature ranges?

A: No. Both components operate across the identical -40°C to 85°C temperature range, maintaining thermal performance equivalence.