74ABT646CSCX Equivalent & Substitute Parts

Part Overview

The 74ABT646CSCX is a non-inverting transceiver logic IC manufactured by onsemi, featuring 1 element with 8 bits per element and 3-state output capability. This component operates within the 4.5V to 5.5V supply voltage range and is housed in a 24-SOP package. The part is currently classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Substiute Parts

74ABT646CSCX

onsemiIn Stock: 87074ABT646CSCX Datasheet

Current PartRFQ

SN74ABT646ADW

Texas InstrumentsIn Stock: 2272SN74ABT646ADW Datasheet

SimilarRFQ

SN74ABT646ANSR

Texas InstrumentsIn Stock: 1055SN74ABT646ANSR Datasheet

SimilarRFQ

SN74ABT646DW

Texas InstrumentsIn Stock: 1147SN74ABT646DW Datasheet

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SN74ABT2952ADWR

Texas InstrumentsIn Stock: 763SN74ABT2952ADWR Datasheet

Parametric EquivalentRFQ

SN74ABT543ADWR

Texas InstrumentsIn Stock: 11209SN74ABT543ADWR Datasheet

Parametric EquivalentRFQ

SN74ABT646ADWR

Texas InstrumentsIn Stock: 2883SN74ABT646ADWR Datasheet

Parametric EquivalentRFQ

SN74ABT646DWR

Texas InstrumentsIn Stock: 925SN74ABT646DWR Datasheet

Parametric EquivalentRFQ

SN74ABT652ADWR

Texas InstrumentsIn Stock: 4930SN74ABT652ADWR Datasheet

Parametric EquivalentRFQ

SN74ABT652DWR

Texas InstrumentsIn Stock: 1025SN74ABT652DWR Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 74ABT646CSCX is determined by strict equivalence across the following critical parameters:

• Logic Type: Transceiver, Non-Inverting
• Number of Elements: 1
• Number of Bits per Element: 8
• Output Type: 3-State
• Current - Output High, Low: 32mA, 64mA
• Voltage - Supply: 4.5V ~ 5.5V
• Operating Temperature: -40°C ~ 85°C (TA)
• Mounting Type: Surface Mount
• Package / Case: 24-SOIC (0.295", 7.50mm Width)

Substitute parts are grouped into two categories:

Direct Substitutes (Same Base Product Number): Parts with identical base product number 74ABT646, differing only in packaging format or manufacturer variant.

Parametric Equivalents (Different Base Product Number): Parts with different base product numbers (74ABT543, 74ABT2952, 74ABT652) that maintain all critical electrical and mechanical parameters, enabling functional equivalence in circuit applications.

Parameter Comparison

Engineering Selection Recommendations

All listed substitute parts maintain electrical and mechanical compatibility with the 74ABT646CSCX across critical parameters. Selection should prioritize parts with Active product status to ensure long-term availability and supply chain stability.

Texas Instruments SN74ABT646 variants (SN74ABT646ADW, SN74ABT646DW, SN74ABT646ADWR, SN74ABT646DWR) provide direct functional equivalence as same base product number alternatives. These parts are ROHS3 compliant and carry Active status, making them preferred choices for new designs and production continuity.

Parametric equivalents SN74ABT543ADWR, SN74ABT2952ADWR, and SN74ABT652ADWR maintain all specified electrical and mechanical parameters while differing in base product designation. These parts are suitable for applications where functional equivalence is the primary requirement.

SN74ABT652DWR is listed as discontinued at DiGi Electronics and should be avoided for new procurement unless alternative supply channels are confirmed.

Package considerations: SN74ABT646ANSR uses a narrower 24-SOIC package (0.209" width) compared to the standard 0.295" width. PCB layout verification is required if this variant is selected.

Frequently Asked Questions (FAQ)

Q: Can I use any of these substitute parts as a direct replacement for the 74ABT646CSCX?

A: Yes. All listed parts maintain identical electrical specifications (voltage supply, output current, operating temperature, logic type, and bit configuration). Physical package compatibility must be verified for the specific PCB layout, particularly for SN74ABT646ANSR which uses a narrower package width.

Q: What is the difference between direct substitutes and parametric equivalents?

A: Direct substitutes share the same base product number (74ABT646) and differ primarily in packaging format or manufacturer variant. Parametric equivalents (74ABT543, 74ABT2952, 74ABT652) have different base product numbers but maintain all critical electrical and mechanical parameters required for functional equivalence in circuit applications.

Q: Why is the 74ABT646CSCX marked as obsolete?

A: The original onsemi part is no longer in active production. Active alternatives from Texas Instruments provide equivalent functionality and are recommended for ongoing designs and production.

Q: Are there any compliance differences between the original part and substitutes?

A: The original 74ABT646CSCX is REACH Unaffected. All Texas Instruments substitutes are ROHS3 Compliant, which represents a higher environmental compliance standard suitable for current manufacturing requirements.

Q: What packaging options are available?

A: Most substitutes are available in 24-SOIC packages with 0.295" width. SN74ABT646ANSR offers a narrower 0.209" width variant. Packaging format options include Tube, Tape & Reel (TR), and standard Surface Mount configurations.

Q: Which substitute part has the highest inventory availability?

A: SN74ABT543ADWR offers the highest inventory level at 11,100 pieces. SN74ABT652ADWR provides 4,823 pieces, and SN74ABT646ADWR provides 2,788 pieces. Inventory levels should be confirmed with current suppliers for procurement planning.