PI74FCT273ATQ Equivalent & Substitute Parts

Part Overview

The PI74FCT273ATQ is a D-type flip-flop logic integrated circuit manufactured by Diodes Incorporated, featuring 1 element with 8-bit configuration and positive edge triggering. This component is classified as obsolete, which necessitates identification of active equivalent parts for ongoing design support and procurement continuity. The 20-SSOP surface mount package provides compact integration for digital logic applications requiring master reset functionality.

Substiute Parts

PI74FCT273ATQ

Diodes IncorporatedIn Stock: 1183PI74FCT273ATQ Datasheet

Current PartRFQ

CY74FCT273ATQCT

Texas InstrumentsIn Stock: 3568CY74FCT273ATQCT Datasheet

MFR RecommendedRFQ

CY74FCT273CTQCT

Texas InstrumentsIn Stock: 3417CY74FCT273CTQCT Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the PI74FCT273ATQ are qualified based on the following criteria:

• Identical base product number (74FCT273) ensuring functional equivalence
• Matching package type (20-SSOP with 0.154", 3.90mm width) for mechanical compatibility
• Identical logic function (D-Type flip-flop, 1 element, 8-bit configuration)
• Compatible trigger type (positive edge)
• Compatible output type (non-inverted)
• Overlapping or superior electrical specifications within the 74FCT logic family
• Active product status from qualified manufacturers

The substitute parts CY74FCT273ATQCT and CY74FCT273CTQCT from Texas Instruments meet all substitution criteria and are currently in active production.

Parameter Comparison

Engineering Selection Recommendations

Both CY74FCT273ATQCT and CY74FCT273CTQCT from Texas Instruments serve as direct functional substitutes for the obsolete PI74FCT273ATQ. Selection between the two active alternatives depends on application-specific performance requirements:

CY74FCT273ATQCT maintains electrical performance parity with the original part, offering identical maximum propagation delay (7.2ns @ 50pF) while providing improved quiescent current characteristics (200 µA versus 500 µA) and enhanced output drive capability (32mA high versus 15mA). This part is suitable for designs requiring direct performance matching with the original specification.

CY74FCT273CTQCT delivers superior propagation delay performance (5.8ns @ 50pF), representing a 19% improvement over the original specification. This variant is appropriate for timing-critical applications where reduced delay provides system-level benefits.

Both substitute parts achieve ROHS3 compliance and active product status, ensuring long-term availability and supply chain stability. The narrower supply voltage range (4.75V ~ 5.25V versus 4.5V ~ 5.5V) requires verification against system power distribution specifications.

Frequently Asked Questions (FAQ)

Q: Can CY74FCT273ATQCT and CY74FCT273CTQCT be used interchangeably with PI74FCT273ATQ?

A: Both Texas Instruments parts are functionally equivalent substitutes. They share identical package geometry (20-SSOP), logic configuration (D-Type flip-flop, 1 element, 8-bit), and operating temperature range. Electrical parameter differences are within acceptable substitution tolerances for the 74FCT logic family.

Q: What is the primary reason for substitution?

A: The PI74FCT273ATQ is classified as obsolete. The recommended substitutes are active products with confirmed long-term availability from Texas Instruments.

Q: Are there package compatibility concerns?

A: No. All three parts use identical 20-SSOP packaging (0.154", 3.90mm width), ensuring direct mechanical and electrical compatibility on printed circuit boards.

Q: How do the supply voltage ranges differ?

A: The original part accepts 4.5V ~ 5.5V, while both substitutes operate within 4.75V ~ 5.25V. Applications using supply voltages below 4.75V or above 5.25V require design review.

Q: Which substitute offers better performance?

A: CY74FCT273CTQCT provides superior propagation delay (5.8ns versus 7.2ns). CY74FCT273ATQCT maintains performance parity with the original part while offering improved quiescent current and output drive characteristics.

Q: Are compliance certifications equivalent?

A: The original part is RoHS non-compliant. Both substitutes achieve ROHS3 compliance, meeting current environmental and regulatory requirements. Moisture sensitivity levels differ (MSL 1 versus MSL 2), requiring appropriate handling procedures during storage and assembly.