74ABT646CMTC Equivalent & Substitute Parts

Part Overview

The 74ABT646CMTC 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 across a 4.5V to 5.5V supply voltage range and is housed in a 24-TSSOP package. The part is currently classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity.

Substiute Parts

74ABT646CMTC

onsemiIn Stock: 104374ABT646CMTC Datasheet

Current PartRFQ

SN74ABT646ADBR

Texas InstrumentsIn Stock: 3088SN74ABT646ADBR Datasheet

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SN74ABT646DBR

Texas InstrumentsIn Stock: 1153SN74ABT646DBR Datasheet

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SN74ABT646PWR

Texas InstrumentsIn Stock: 761SN74ABT646PWR Datasheet

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SN74ABT543APW

Texas InstrumentsIn Stock: 1383SN74ABT543APW Datasheet

Parametric EquivalentRFQ

SN74ABT646APW

Texas InstrumentsIn Stock: 1108SN74ABT646APW Datasheet

Parametric EquivalentRFQ

SN74ABT646PW

Texas InstrumentsIn Stock: 1627SN74ABT646PW Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 74ABT646CMTC is determined by strict alignment with the following electrical and mechanical 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
• Series: 74ABT

Substitute parts are grouped into two categories:

Direct Package Substitutes (24-TSSOP): Parts maintaining identical package specifications (24-TSSOP, 0.173", 4.40mm Width) with all electrical parameters matching the original.

Package Variant Substitutes (24-SSOP): Parts with equivalent electrical specifications but utilizing the 24-SSOP package variant (0.209", 5.30mm Width), requiring PCB layout verification for mechanical compatibility.

Parameter Comparison

Engineering Selection Recommendations

All listed substitute parts maintain full electrical and functional equivalence to the 74ABT646CMTC. Selection criteria are based on product status, compliance certifications, and packaging requirements:

Primary Substitutes (24-TSSOP Package - Direct Mechanical Compatibility):

• SN74ABT646PWR (Texas Instruments, Tape & Reel): Active product status with ROHS3 compliance. Identical 24-TSSOP package footprint. Recommended for new designs requiring direct PCB compatibility without layout modifications.

• SN74ABT646APW (Texas Instruments, Tube): Active product status with ROHS3 compliance. Identical 24-TSSOP package footprint. Suitable for applications where tube packaging is acceptable.

• SN74ABT646PW (Texas Instruments, Tube): Active product status with ROHS3 compliance. Identical 24-TSSOP package footprint. Highest inventory availability among direct package matches.

• SN74ABT543APW (Texas Instruments, Tube): Active product status with ROHS3 compliance. Identical 24-TSSOP package footprint. Parametrically equivalent with different base product designation.

Secondary Substitutes (24-SSOP Package - Layout Verification Required):

• SN74ABT646ADBR (Texas Instruments, Tape & Reel): Active product status with ROHS3 compliance. 24-SSOP package (0.209", 5.30mm Width) requires PCB footprint verification due to increased package width compared to 24-TSSOP (0.173", 4.40mm Width).

• SN74ABT646DBR (Texas Instruments, Tape & Reel): Active product status with ROHS3 compliance. 24-SSOP package variant with same layout considerations as SN74ABT646ADBR.

All substitute parts carry REACH Unaffected and EAR99 ECCN classifications matching the original component. Moisture Sensitivity Level remains MSL 1 (Unlimited) across all alternatives.

Frequently Asked Questions (FAQ)

Q: Can SN74ABT646PWR be used as a direct replacement for 74ABT646CMTC?

A: Yes. SN74ABT646PWR maintains identical electrical specifications (1 element, 8 bits per element, 3-state output, 32mA/64mA output current, 4.5V–5.5V supply, -40°C to 85°C operating range) and uses the same 24-TSSOP package footprint. No PCB modifications are required.

Q: What is the difference between 24-TSSOP and 24-SSOP packages?

A: Both are surface-mount packages with 24 pins, but differ in width: 24-TSSOP measures 0.173" (4.40mm) while 24-SSOP measures 0.209" (5.30mm). This width difference may affect PCB layout compatibility. Verify footprint spacing before selecting 24-SSOP variants.

Q: Why is the 74ABT646CMTC marked as obsolete?

A: The original onsemi part is obsolete, but functionally equivalent Texas Instruments parts (SN74ABT646 series) remain in active production with full electrical compatibility.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All Texas Instruments substitute parts listed carry ROHS3 compliance certification, meeting current environmental and regulatory requirements.

Q: What packaging options are available for substitute parts?

A: Substitute parts are available in three packaging formats: Tape & Reel (TR), Tube, and individual configurations. Selection depends on procurement volume and assembly process requirements.

Q: Can SN74ABT543APW be used interchangeably with SN74ABT646APW?

A: Both parts are parametrically equivalent with identical electrical specifications and 24-TSSOP package footprint. The difference lies in base product designation (74ABT543 vs. 74ABT646). Verify functional requirements and application-specific documentation before substitution.

Q: Do substitute parts maintain the same operating temperature range?

A: Yes. All substitute parts operate across the identical -40°C to 85°C temperature range as the original 74ABT646CMTC.