74ABT574CMTC Equivalent & Substitute Parts

Part Overview

The 74ABT574CMTC is a D-type flip-flop logic integrated circuit manufactured by onsemi, featuring 1 element with 8-bit capacity and tri-state inverted output configuration. This component operates at 200 MHz clock frequency with positive edge triggering and is housed in a 20-TSSOP package. The part is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations.

Substiute Parts

74ABT574CMTC

onsemiIn Stock: 231074ABT574CMTC Datasheet

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SN74ABT574ADBR

Texas InstrumentsIn Stock: 4826SN74ABT574ADBR Datasheet

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SN74ABT574APW

Texas InstrumentsIn Stock: 2056SN74ABT574APW Datasheet

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SN74ABT574APWR

Texas InstrumentsIn Stock: 3006SN74ABT574APWR Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the 74ABT574CMTC is determined by strict alignment of the following electrical and mechanical parameters:

Core Compatibility Criteria:

• Series designation (74ABT)
• Base product number (74ABT574)
• Functional type (D-Type flip-flop, 1 element, 8-bit)
• Clock frequency (200 MHz minimum)
• Trigger mechanism (Positive Edge)
• Supply voltage range (4.5V ~ 5.5V)
• Operating temperature range (-40°C ~ 85°C)
• Mounting type (Surface Mount)

Package Compatibility: The 74ABT574CMTC uses 20-TSSOP packaging. Substitutes must maintain identical or functionally equivalent package specifications to ensure PCB layout compatibility.

Output Configuration Consideration: The main part features tri-state inverted output. Substitute parts with tri-state non-inverted output (SN74ABT574ADBR, SN74ABT574APW, SN74ABT574APWR) are functionally equivalent at the logic level but require circuit-level verification to confirm inverted output is not a critical design requirement.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (Recommended):

SN74ABT574APW and SN74ABT574APWR are the preferred substitutes for the 74ABT574CMTC. Both parts maintain identical 20-TSSOP packaging, ensuring direct PCB compatibility without layout modifications. These Texas Instruments components are in active production status with ROHS3 compliance certification, providing long-term supply chain stability. The propagation delay differential (6.6ns versus 5ns) and quiescent current increase (250 µA versus 50 µA) fall within acceptable operational margins for most 74ABT series applications.

Secondary Substitute (Package Consideration):

SN74ABT574ADBR offers functional equivalence but uses 20-SSOP packaging (0.209", 5.30mm width) instead of 20-TSSOP (0.173", 4.40mm width). This package difference requires PCB layout verification and may necessitate footprint adjustment. Selection of this part is appropriate only when package size constraints are not critical to the design.

Output Configuration Note:

All three Texas Instruments substitutes feature tri-state non-inverted output, whereas the original 74ABT574CMTC specifies tri-state inverted output. Circuit-level analysis is required to confirm that inverted output polarity is not a functional requirement. If inverted output is essential, alternative logic configurations or external inversion circuitry must be evaluated.

Frequently Asked Questions (FAQ)

Q: Can SN74ABT574ADBR replace 74ABT574CMTC directly on the PCB?

A: SN74ABT574ADBR is functionally equivalent but uses 20-SSOP packaging versus the original 20-TSSOP. The package footprint dimensions differ (0.209" versus 0.173" width), requiring PCB layout verification. Direct socket replacement is not possible without footprint modification.

Q: What is the significance of the output type difference (Inverted vs. Non-Inverted)?

A: The 74ABT574CMTC produces inverted tri-state outputs, while SN74ABT574APW, SN74ABT574APWR, and SN74ABT574ADBR produce non-inverted outputs. This affects signal polarity at the flip-flop outputs. Circuit-level analysis must confirm whether the design depends on inverted output polarity or if non-inverted output is acceptable.

Q: Are the propagation delay differences between 5ns and 6.6ns significant?

A: The 1.6ns propagation delay increase in Texas Instruments substitutes is within typical 74ABT series operational tolerances. For applications operating at 200 MHz or below, this difference does not impact functional performance. High-speed timing-critical applications should evaluate setup and hold time requirements against specific circuit constraints.

Q: What is the impact of increased quiescent current (250 µA vs. 50 µA)?

A: The quiescent current increase reflects manufacturing differences between onsemi and Texas Instruments implementations. For most applications, this 200 µA difference has negligible impact on overall system power consumption. Power-sensitive designs should calculate total system current draw to confirm acceptability.

Q: Why is the 74ABT574CMTC classified as obsolete?

A: Obsolete status indicates the part is no longer manufactured by onsemi. Texas Instruments continues active production of functionally equivalent 74ABT574 variants, ensuring long-term component availability through alternative sources.

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

A: SN74ABT574APW and SN74ABT574APWR, both manufactured by Texas Instruments and in active production status, provide the most reliable long-term supply chain. Both maintain identical 20-TSSOP packaging and electrical specifications suitable for direct substitution.