74ABT273CMTC Equivalent & Substitute Parts

Part Overview

The 74ABT273CMTC is a D-type flip-flop logic integrated circuit manufactured by onsemi, featuring 1 element with 8-bit parallel data storage capability. This device operates as a master reset flip-flop with positive edge triggering and non-inverted outputs. The part is classified as obsolete, making equivalent substitutes necessary for ongoing design support and procurement.

Substiute Parts

74ABT273CMTC

onsemiIn Stock: 70774ABT273CMTC Datasheet

Current PartRFQ

SN74ABT273PW

Texas InstrumentsIn Stock: 1460SN74ABT273PW Datasheet

DirectRFQ

SN74ABT273PWR

Texas InstrumentsIn Stock: 3334SN74ABT273PWR Datasheet

DirectRFQ

SN74ABT273DBR

Texas InstrumentsIn Stock: 4716SN74ABT273DBR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 74ABT273CMTC is determined by the following critical parameters:

Functional Equivalence Requirements:

• Series: 74ABT
• Type: D-Type Flip-Flop
• Number of Elements: 1
• Number of Bits per Element: 8
• Trigger Type: Positive Edge
• Output Type: Non-Inverted
• Function: Master Reset

Electrical Compatibility Requirements:

• Voltage - Supply: 4.5V ~ 5.5V
• Max Propagation Delay @ 5V, 50pF: 6.8 ns
• Current - Output High, Low: 32 mA, 64 mA
• Operating Temperature: -40°C ~ 85°C

Package Compatibility:

• Mounting Type: Surface Mount
• Package / Case: 20-TSSOP or 20-SSOP (mechanically compatible footprints)

Substitute parts are classified into two categories:

Direct Substitutes (Identical Package): Parts maintaining the 20-TSSOP package specification with all electrical parameters matching or exceeding the original part requirements.

Similar Substitutes (Compatible Package): Parts with equivalent electrical performance but utilizing the 20-SSOP package, which shares the same pin configuration and is mechanically compatible with 20-TSSOP footprints in standard PCB designs.

Parameter Comparison

Engineering Selection Recommendations

SN74ABT273PW and SN74ABT273PWR (Direct Substitutes):

Both Texas Instruments parts maintain the 20-TSSOP package specification and are functionally equivalent to the 74ABT273CMTC. These parts are classified as active products with ROHS3 compliance, ensuring long-term availability and regulatory alignment. The SN74ABT273PW is supplied in tube packaging, while the SN74ABT273PWR is supplied in tape and reel format for automated assembly processes. Both parts meet all electrical requirements with identical propagation delay specifications and output drive capabilities.

SN74ABT273DBR (Similar Substitute):

The SN74ABT273DBR utilizes the 20-SSOP package instead of 20-TSSOP. This package variant maintains identical pin configuration and electrical performance but features a slightly wider body (5.30mm versus 4.40mm). This part is suitable for designs where PCB layout accommodates the SSOP footprint or where component density is not a constraint. The part is active and ROHS3 compliant.

Quiescent Current Consideration:

All Texas Instruments substitutes exhibit higher quiescent current (400 µA) compared to the original onsemi part (50 µA). This difference is within acceptable limits for most 5V logic applications but should be evaluated in power-sensitive designs.

Frequently Asked Questions (FAQ)

Q: Can SN74ABT273PW and SN74ABT273PWR be used interchangeably with 74ABT273CMTC?

A: Yes. Both parts are direct electrical and functional equivalents. The difference is packaging format: SN74ABT273PW is supplied in tube packaging for manual handling, while SN74ABT273PWR is supplied in tape and reel format for automated pick-and-place assembly. Both maintain the 20-TSSOP package footprint.

Q: Is SN74ABT273DBR compatible with existing PCB designs for 74ABT273CMTC?

A: SN74ABT273DBR shares the same pin configuration and electrical specifications but uses the 20-SSOP package with a wider body (5.30mm versus 4.40mm). It is mechanically compatible with standard 20-TSSOP footprints in most PCB designs, though layout verification is recommended for high-density applications.

Q: What is the significance of the higher quiescent current in Texas Instruments substitutes?

A: The Texas Instruments parts consume 400 µA in quiescent state compared to 50 µA for the original onsemi part. This 8x increase affects power consumption in standby conditions. For applications with strict power budgets, this parameter should be evaluated against system requirements.

Q: Are all substitute parts RoHS compliant?

A: Yes. All Texas Instruments substitutes (SN74ABT273PW, SN74ABT273PWR, and SN74ABT273DBR) are ROHS3 compliant. The original onsemi part does not specify RoHS status.

Q: What is the difference between 20-TSSOP and 20-SSOP packages?

A: Both are 20-pin surface mount packages with identical pin configurations. The 20-TSSOP has a body width of 4.40mm, while the 20-SSOP has a body width of 5.30mm. Electrical performance is identical; the difference is physical footprint size.

Q: Can I use these parts in new designs?

A: Yes. All Texas Instruments substitutes are active products with confirmed long-term availability. They are suitable for both replacement and new design applications.