74ACTQ273SJ Equivalent & Substitute Parts

Part Overview

The 74ACTQ273SJ is a D-Type flip-flop logic integrated circuit manufactured by onsemi, featuring 1 element with 8-bit configuration and positive edge triggering. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing design support and production continuity. The part operates at a maximum clock frequency of 189 MHz with a propagation delay of 8.5ns at 5V with 50pF load, housed in a 20-SOIC surface mount package.

Substiute Parts

74ACTQ273SJ

onsemiIn Stock: 74374ACTQ273SJ Datasheet

Current PartRFQ

CD74ACT273M96

Texas InstrumentsIn Stock: 1481CD74ACT273M96 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 74ACTQ273SJ is determined by the following critical parameters:

• Logic Function: D-Type flip-flop with 1 element, 8-bit configuration, positive edge trigger, non-inverted output, and master reset function
• Electrical Compatibility: Supply voltage range 4.5V ~ 5.5V, output current capability 24mA minimum, and positive edge triggering
• Package Compatibility: 20-SOIC surface mount package with compatible pinout
• Performance Characteristics: Clock frequency and propagation delay specifications that meet or exceed application requirements

The CD74ACT273M96 from Texas Instruments satisfies these substitution criteria as an active product with identical logic function, compatible electrical specifications, and equivalent package footprint.

Parameter Comparison

Engineering Selection Recommendations

The CD74ACT273M96 is the qualified substitute for the obsolete 74ACTQ273SJ based on the following factors:

Product Status: The CD74ACT273M96 maintains active product status with Texas Instruments, ensuring long-term availability and manufacturing support compared to the obsolete 74ACTQ273SJ.

Functional Equivalence: Both parts implement identical D-Type flip-flop logic with 8-bit configuration, positive edge triggering, and master reset functionality. Pinout compatibility is maintained for direct substitution.

Electrical Compatibility: Both parts operate within the 4.5V ~ 5.5V supply range with matching output current specifications (24mA). The CD74ACT273M96 exhibits lower quiescent current (8 µA versus 40 µA), providing improved power efficiency.

Compliance and Certifications: The CD74ACT273M96 is ROHS3 compliant, meeting modern regulatory requirements. Both parts carry REACH Unaffected status and EAR99 classification.

Performance Considerations: The 74ACTQ273SJ operates at higher clock frequency (189 MHz) and faster propagation delay (8.5ns) compared to the CD74ACT273M96 (80 MHz, 14.6ns). Applications requiring the maximum performance specifications of the original part should evaluate timing margins before substitution.

Package Footprint: Both parts use 20-SOIC surface mount packages. Physical dimensions differ slightly (0.209" versus 0.295" width), requiring PCB layout verification for space-constrained applications.

Frequently Asked Questions (FAQ)

Q: Can the CD74ACT273M96 directly replace the 74ACTQ273SJ in existing designs?

A: Functional and electrical compatibility is established for both parts. Pinout is identical, and supply voltage requirements match. PCB layout must accommodate the slightly larger package width of the CD74ACT273M96 (0.295" versus 0.209"). Timing analysis is required if the application depends on the faster propagation delay of the original part.

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

A: The primary differences are product status (obsolete versus active), clock frequency specification (189 MHz versus 80 MHz), propagation delay (8.5ns versus 14.6ns), quiescent current (40 µA versus 8 µA), and operating temperature range (-40°C to 85°C versus -55°C to 125°C). The CD74ACT273M96 offers improved power efficiency and extended temperature range.

Q: Are there packaging format differences?

A: The 74ACTQ273SJ is supplied in tube packaging, while the CD74ACT273M96 is available in Tape & Reel (TR) format. Both are surface mount 20-SOIC packages with slightly different physical dimensions.

Q: Does the CD74ACT273M96 meet RoHS requirements?

A: Yes, the CD74ACT273M96 is ROHS3 compliant. The 74ACTQ273SJ RoHS status is not specified in the available documentation.

Q: What should be considered when substituting for timing-critical applications?

A: The CD74ACT273M96 has a maximum propagation delay of 14.6ns compared to 8.5ns for the 74ACTQ273SJ. Applications with tight timing constraints must verify that the slower propagation delay does not violate system timing requirements.

Q: Is the lower quiescent current of the CD74ACT273M96 significant?

A: The CD74ACT273M96 draws 8 µA quiescent current versus 40 µA for the 74ACTQ273SJ. For battery-powered or low-power applications, this represents an 80% reduction in standby current consumption.