74ACTQ273PC Equivalent & Substitute Parts

Part Overview

The 74ACTQ273PC 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 non-inverted outputs, operating across a 4.5V to 5.5V supply voltage range. The device is classified as obsolete, making equivalent substitute parts necessary for ongoing system maintenance, repairs, and legacy design support.

Substiute Parts

74ACTQ273PC

onsemiIn Stock: 87774ACTQ273PC Datasheet

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CD74ACT273E

Harris CorporationIn Stock: 1249CD74ACT273E Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the 74ACTQ273PC is determined by the following critical parameters:

• Package Compatibility: Both the main part and substitute must use 20-DIP (0.300", 7.62mm) through-hole packaging to ensure direct PCB mounting compatibility.
• Functional Equivalence: The substitute must be a D-type flip-flop with 8-bit configuration, positive edge triggering, and master reset functionality.
• Electrical Specifications: Supply voltage range (4.5V ~ 5.5V), output current capability (24mA high/low), and trigger type must remain consistent.
• Logic Family: Both parts belong to the 74ACT logic family, ensuring TTL-compatible signal levels and timing characteristics.

The CD74ACT273E from Harris Corporation meets these substitution criteria, providing functional and electrical equivalence within the specified parameters.

Parameter Comparison

Engineering Selection Recommendations

The CD74ACT273E serves as a direct functional substitute for the 74ACTQ273PC based on matching package geometry, electrical specifications, and logic family classification. Both components are classified as obsolete products, reflecting their legacy status in the 74ACT logic family.

The CD74ACT273E exhibits lower quiescent current (8 µA versus 40 µA) and an extended operating temperature range (-55°C ~ 125°C versus -40°C ~ 85°C), providing potential advantages in power-constrained and temperature-extreme applications. However, the CD74ACT273E operates at a reduced maximum clock frequency (85 MHz versus 189 MHz) and exhibits increased propagation delay (14.6ns versus 8.5ns), which may impact timing-critical circuit designs.

The CD74ACT273E is RoHS non-compliant, whereas the 74ACTQ273PC carries REACH Unaffected status. Both components share identical output current ratings and supply voltage specifications, ensuring direct electrical compatibility in standard TTL applications.

Frequently Asked Questions (FAQ)

Q: Can the CD74ACT273E replace the 74ACTQ273PC in existing designs?

A: Yes, the CD74ACT273E provides functional and electrical equivalence for the 74ACTQ273PC. Both components feature identical 20-DIP packaging, 8-bit D-type flip-flop configuration, positive edge triggering, and 4.5V ~ 5.5V supply voltage specifications. Timing-sensitive applications must account for the CD74ACT273E's increased propagation delay (14.6ns versus 8.5ns).

Q: Are there package compatibility concerns?

A: No. Both the 74ACTQ273PC and CD74ACT273E use 20-DIP (0.300", 7.62mm) through-hole packaging, enabling direct PCB mounting without modification.

Q: What are the key electrical differences between these parts?

A: The primary differences are clock frequency (189 MHz versus 85 MHz), propagation delay (8.5ns versus 14.6ns), quiescent current (40 µA versus 8 µA), and operating temperature range (-40°C ~ 85°C versus -55°C ~ 125°C). Output current ratings and supply voltage specifications remain identical.

Q: Which part should be selected for new designs?

A: Both components are obsolete. For new designs, contemporary D-type flip-flop alternatives from active product lines should be evaluated based on current availability, performance requirements, and compliance certifications.

Q: Does the CD74ACT273E meet RoHS compliance?

A: No. The CD74ACT273E is RoHS non-compliant. The 74ACTQ273PC carries REACH Unaffected status. Compliance requirements must be verified against specific application and regulatory standards.