74LCX16646MEAX Equivalent & Substitute Parts

Part Overview

The 74LCX16646MEAX is a non-inverting transceiver IC manufactured by onsemi, featuring 2 elements with 8 bits per element and 3-state output capability. This component operates across a 2V to 3.6V supply voltage range and is housed in a 56-BSSOP package. The part is currently classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Substiute Parts

74LCX16646MEAX

onsemiIn Stock: 202774LCX16646MEAX Datasheet

Current PartRFQ

SN74LVC16646ADLR

Texas InstrumentsIn Stock: 799SN74LVC16646ADLR Datasheet

DirectRFQ

SN74LVC16646ADGGR

Texas InstrumentsIn Stock: 2415SN74LVC16646ADGGR Datasheet

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SN74LVC16646ADL

Texas InstrumentsIn Stock: 1239SN74LVC16646ADL Datasheet

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SN74LVCH16646ADGGR

Texas InstrumentsIn Stock: 3249SN74LVCH16646ADGGR Datasheet

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SN74LVCH16646ADL

Texas InstrumentsIn Stock: 1065SN74LVCH16646ADL Datasheet

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SN74LVCH16646ADLR

Texas InstrumentsIn Stock: 3390SN74LVCH16646ADLR Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 74LCX16646MEAX are qualified based on the following critical parameters:

Functional Equivalence: Logic type (Transceiver, Non-Inverting), number of elements (2), bits per element (8), and output type (3-State) must remain identical.

Electrical Compatibility: Output current capability (24mA, 24mA for high and low) and operating temperature range (-40°C ~ 85°C) must match or exceed the original specification.

Supply Voltage Range: Substitute parts must operate within or encompass the original 2V to 3.6V range. Parts with extended lower voltage limits (1.65V) remain compatible as they support the full original range.

Package Compatibility: Substitutes are grouped by physical package type. Parts in 56-BSSOP (0.295", 7.50mm Width) are direct mechanical equivalents. Parts in 56-TFSOP (0.240", 6.10mm Width) represent a different package footprint and require PCB layout verification.

Product Status: Active-status substitutes from Texas Instruments (74LVC and 74LVCH series) provide long-term availability and design continuity compared to the obsolete 74LCX series.

Parameter Comparison

Engineering Selection Recommendations

Direct Package Equivalents (56-BSSOP): SN74LVC16646ADLR, SN74LVC16646ADL, SN74LVCH16646ADL, and SN74LVCH16646ADLR provide identical physical footprints to the 74LCX16646MEAX. These parts require no PCB layout modifications and are suitable for direct replacement in existing designs. All are manufactured by Texas Instruments with active product status and ROHS3 compliance, ensuring long-term supply continuity.

Alternative Package Options (56-TFSOP): SN74LVC16646ADGGR and SN74LVCH16646ADGGR feature a narrower 56-TFSOP package (0.240", 6.10mm Width) compared to the original 56-BSSOP (0.295", 7.50mm Width). These parts maintain full electrical equivalence but require PCB layout verification due to different package dimensions.

Series Selection: The 74LVC series (SN74LVC16646ADLR, SN74LVC16646ADGGR, SN74LVC16646ADL) represents the direct successor to the obsolete 74LCX series. The 74LVCH series (SN74LVCH16646ADGGR, SN74LVCH16646ADL, SN74LVCH16646ADLR) offers equivalent functionality with enhanced performance characteristics. Both series are active products with full compliance certifications.

Packaging Format: Selection between Tape & Reel (TR) and Tube packaging depends on procurement volume and assembly requirements. Tape & Reel format is standard for high-volume automated assembly, while Tube packaging accommodates lower-volume or manual assembly processes.

Frequently Asked Questions (FAQ)

Q: Can SN74LVC16646ADGGR replace 74LCX16646MEAX directly on the PCB?

A: SN74LVC16646ADGGR is electrically equivalent but uses a different package (56-TFSOP vs. 56-BSSOP). The footprint dimensions differ, requiring PCB layout verification. For direct PCB replacement without layout changes, use SN74LVC16646ADLR, SN74LVC16646ADL, SN74LVCH16646ADL, or SN74LVCH16646ADLR, which maintain the identical 56-BSSOP package.

Q: What is the difference between 74LVC and 74LVCH series substitutes?

A: Both 74LVC and 74LVCH series maintain identical electrical specifications for this application: 2 elements, 8 bits per element, 3-state output, 24mA output current, and -40°C to 85°C operating temperature. The primary distinction is series designation; both are active products from Texas Instruments with ROHS3 compliance. Selection between series depends on design requirements and availability.

Q: Are all substitute parts compatible with the original 2V to 3.6V supply voltage range?

A: Yes. All substitute parts (74LVC and 74LVCH series) operate across 1.65V to 3.6V, which encompasses and exceeds the original 74LCX16646MEAX specification of 2V to 3.6V. This extended lower voltage limit provides additional design flexibility without compromising compatibility.

Q: What packaging options are available for substitutes?

A: Substitute parts are available in two package types: 56-BSSOP (0.295", 7.50mm Width) and 56-TFSOP (0.240", 6.10mm Width). Within each package type, parts are offered in Tape & Reel (TR) or Tube packaging formats. Verify your PCB design accommodates the selected package footprint before procurement.

Q: Why is the 74LCX16646MEAX classified as obsolete?

A: The 74LCX series has been superseded by the 74LVC and 74LVCH series from Texas Instruments. These newer series offer active product status, extended availability, and full compliance certifications (ROHS3). For new designs and ongoing production support, Texas Instruments substitutes are the recommended choice.

Q: Are moisture sensitivity levels identical across all parts?

A: Yes. The 74LCX16646MEAX and all substitute parts (SN74LVC and SN74LVCH series) are rated MSL 1 (Unlimited), indicating no moisture sensitivity restrictions during storage or handling.