74ACTQ273MTCX Equivalent & Substitute Parts

Part Overview

The 74ACTQ273MTCX is a D-type flip-flop logic integrated circuit manufactured by onsemi, designed for 8-bit parallel data storage with positive edge triggering. This component features a master reset function and operates across the standard 4.5V to 5.5V supply voltage range. The part is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations.

Substiute Parts

74ACTQ273MTCX

onsemiIn Stock: 90774ACTQ273MTCX Datasheet

Current PartRFQ

MC74ACT273DTR2G

onsemiIn Stock: 9875MC74ACT273DTR2G Datasheet

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CD74ACT273PWR

Texas InstrumentsIn Stock: 17179CD74ACT273PWR Datasheet

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CD74ACT273SM96

Texas InstrumentsIn Stock: 2168CD74ACT273SM96 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 74ACTQ273MTCX is determined by strict alignment with the following core parameters:

• Functional Type: D-type flip-flop with 8-bit configuration and positive edge triggering
• Function: Master reset capability
• Output Configuration: Non-inverted outputs
• Supply Voltage Range: 4.5V ~ 5.5V compatibility
• Package Compatibility: 20-TSSOP or mechanically equivalent surface-mount packages
• Mounting Type: Surface mount technology

The substitute parts identified below maintain these critical parameters. Variations in clock frequency, propagation delay, quiescent current, and operating temperature ranges are permissible within the scope of functional equivalence, provided the substitute part does not introduce incompatibilities with the host system's electrical or thermal requirements.

Parameter Comparison

Engineering Selection Recommendations

MC74ACT273DTR2G (onsemi): This part maintains identical package geometry (20-TSSOP) and operating temperature range to the 74ACTQ273MTCX. It is currently in active production status with RoHS3 compliance. The clock frequency specification of 200 MHz exceeds the original part's 189 MHz rating, and quiescent current is reduced to 8 µA. This substitute is suitable for direct replacement in applications where the original package footprint and thermal operating range are design constraints.

CD74ACT273PWR (Texas Instruments): This part is manufactured by Texas Instruments and maintains the identical 20-TSSOP package footprint. It is in active production with RoHS3 compliance. The operating temperature range extends to -55°C ~ 125°C, providing broader thermal coverage than the original part. Clock frequency is specified at 85 MHz with 14.6ns propagation delay. This substitute is appropriate for applications requiring extended temperature operation or where Texas Instruments supply chain preference is established.

CD74ACT273SM96 (Texas Instruments): This part differs in package configuration, utilizing a 20-SSOP case (0.209", 5.30mm width) instead of the 20-TSSOP. It is in active production with RoHS3 compliance and extended operating temperature range (-55°C ~ 125°C). This substitute is applicable only when PCB layout accommodates the wider SSOP package footprint or when package migration is acceptable within the design revision scope.

Frequently Asked Questions (FAQ)

Q: Can MC74ACT273DTR2G be used as a direct replacement for 74ACTQ273MTCX?

A: Yes. Both parts share identical package geometry (20-TSSOP), matching operating temperature range (-40°C ~ 85°C), and equivalent electrical specifications for output current, supply voltage, and functional configuration. The MC74ACT273DTR2G is in active production status, addressing the obsolescence of the original part.

Q: What is the difference between CD74ACT273PWR and CD74ACT273SM96?

A: The primary difference is package configuration. CD74ACT273PWR uses 20-TSSOP (0.173" width), while CD74ACT273SM96 uses 20-SSOP (0.209" width). Both are Texas Instruments products with identical electrical specifications. Package selection depends on PCB layout constraints and available footprint space.

Q: Are there any performance trade-offs when substituting with CD74ACT273PWR?

A: The CD74ACT273PWR operates at a lower clock frequency (85 MHz versus 189 MHz) and exhibits slightly higher propagation delay (14.6ns versus 8.5ns). These specifications remain within acceptable parameters for standard logic applications. The extended operating temperature range (-55°C ~ 125°C) provides additional thermal margin compared to the original part.

Q: Is the higher quiescent current of the 74ACTQ273MTCX (40 µA) a concern when substituting with active alternatives?

A: No. The substitute parts (MC74ACT273DTR2G, CD74ACT273PWR, CD74ACT273SM96) all specify 8 µA quiescent current, which is lower than the original part. This represents an improvement in power efficiency and does not introduce compatibility issues.

Q: Can CD74ACT273SM96 be used in applications designed for 20-TSSOP packages?

A: No. The CD74ACT273SM96 uses a 20-SSOP package with different pin spacing and board footprint. Direct substitution requires PCB layout modification. Use this part only when design revision and layout changes are acceptable.

Q: What compliance certifications apply to these substitute parts?

A: MC74ACT273DTR2G carries RoHS3 compliance. Both Texas Instruments parts (CD74ACT273PWR and CD74ACT273SM96) are RoHS3 compliant. All parts are REACH unaffected and classified under ECCN EAR99. Moisture sensitivity level is 1 (unlimited) for all parts.