74LCX16543MEAX Equivalent & Substitute Parts

Part Overview

The 74LCX16543MEAX is a non-inverting transceiver IC manufactured by onsemi, featuring 2 elements with 8 bits per element and 3-state output capability. Designed for 3.6V operation in a 56-SSOP package, this component is classified as obsolete. Due to its discontinued status, identifying functionally equivalent substitute parts is essential for design continuity and procurement planning. The 74LVCH series provides direct functional equivalents with enhanced specifications and active product status.

Substiute Parts

74LCX16543MEAX

onsemiIn Stock: 90174LCX16543MEAX Datasheet

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74LVCH16543APAG

IDT, Integrated Device Technology IncIn Stock: 258674LVCH16543APAG Datasheet

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SN74LVCH16543ADGGR

Texas InstrumentsIn Stock: 2402SN74LVCH16543ADGGR Datasheet

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SN74LVCH16543ADGVR

Texas InstrumentsIn Stock: 984SN74LVCH16543ADGVR Datasheet

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SN74LVCH16543ADL

Texas InstrumentsIn Stock: 1146SN74LVCH16543ADL Datasheet

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SN74LVCH16543ADLR

Texas InstrumentsIn Stock: 1056SN74LVCH16543ADLR Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 74LCX16543MEAX are qualified based on the following critical parameters:

• Logic Type: Transceiver, Non-Inverting (identical function)
• Number of Elements: 2 (identical configuration)
• Number of Bits per Element: 8 (identical configuration)
• Output Type: 3-State (identical output capability)
• Current - Output High, Low: 24mA, 24mA (identical drive capability)
• Operating Temperature: -40°C ~ 85°C (identical thermal range)
• Mounting Type: Surface Mount (identical assembly method)

Substitutes are grouped into two categories based on package compatibility:

Category 1 - Same Package (56-SSOP): SN74LVCH16543ADL and SN74LVCH16543ADLR maintain identical physical footprint and pinout, enabling direct board-level replacement.

Category 2 - Compatible Package (56-TSSOP/56-TVSOP): 74LVCH16543APAG and SN74LVCH16543ADGGR utilize thinner TSSOP packages with identical pinout but reduced body width, suitable for space-constrained applications. SN74LVCH16543ADGVR uses 56-TVSOP with further reduced width.

All substitutes operate within the required voltage and temperature ranges with identical electrical performance characteristics.

Parameter Comparison

Engineering Selection Recommendations

For direct replacement of the obsolete 74LCX16543MEAX, select from active product status alternatives:

Primary Selection - Same Package Footprint: SN74LVCH16543ADLR (Tape & Reel) or SN74LVCH16543ADL (Tube) maintain the 56-BSSOP package identical to the original part. Both are manufactured by Texas Instruments with active product status and ROHS3 compliance. These options eliminate PCB redesign requirements and provide extended voltage range (1.65V ~ 3.6V) compared to the original specification.

Secondary Selection - Space-Optimized Packages: 74LVCH16543APAG (IDT, Bulk packaging) and SN74LVCH16543ADGGR (Texas Instruments, Tape & Reel) utilize 56-TFSOP packages with reduced body width (6.10mm vs 7.50mm). Both maintain identical pinout and electrical performance. SN74LVCH16543ADGGR offers ROHS3 compliance and active status from a Tier-1 manufacturer.

Avoid: SN74LVCH16543ADGVR is discontinued at DiGi Electronics and should not be selected for new designs despite technical compatibility.

Frequently Asked Questions (FAQ)

Q: Can SN74LVCH16543ADLR directly replace 74LCX16543MEAX on existing PCBs?

A: Yes. SN74LVCH16543ADLR uses the identical 56-BSSOP package with matching pinout and footprint. No PCB modifications are required. The part is pin-for-pin compatible and electrically equivalent.

Q: What is the difference between 56-SSOP and 56-TSSOP packages?

A: Both packages have identical pinout and footprint dimensions (56 pins, 0.295" width for SSOP, 0.240" width for TSSOP). The TSSOP variant uses thinner lead frames. For PCB compatibility, verify your design accommodates the specific package width. If your PCB is designed for 56-BSSOP (7.50mm), use SN74LVCH16543ADL or SN74LVCH16543ADLR. If space permits, 56-TFSOP variants (6.10mm) are acceptable with identical electrical performance.

Q: Does the extended voltage range of 74LVCH series (1.65V ~ 3.6V) affect compatibility?

A: No. The extended lower voltage limit of 74LVCH parts (1.65V vs 2V) provides enhanced flexibility. If your circuit operates at 2V or higher, all 74LVCH substitutes are fully compatible. The upper limit remains 3.6V, matching the original specification.

Q: Which substitute offers the best long-term availability?

A: SN74LVCH16543ADLR and SN74LVCH16543ADL from Texas Instruments are recommended. Both maintain active product status with ROHS3 compliance, ensuring continued availability and supply chain stability. 74LVCH16543APAG (IDT) is also active but verify IDT product lifecycle status for your procurement timeline.

Q: Are all substitutes RoHS compliant?

A: Texas Instruments variants (SN74LVCH16543ADLR, SN74LVCH16543ADL, SN74LVCH16543ADGGR, SN74LVCH16543ADGVR) are ROHS3 compliant. IDT's 74LVCH16543APAG does not specify RoHS status in available documentation. Verify RoHS compliance requirements for your application before selection.

Q: What is the difference between Tape & Reel and Tube packaging?

A: Both contain identical components with different packaging formats. Tape & Reel (TR) is optimized for automated assembly lines. Tube packaging is suitable for manual assembly or lower-volume applications. Electrical performance is identical; selection depends on your manufacturing process.