SN74ACT564DBR Equivalent & Substitute Parts

Part Overview

The SN74ACT564DBR is a D-Type flip-flop logic integrated circuit manufactured by Texas Instruments, featuring 1 element with 8-bit configuration and tri-state inverted output. This component operates at a maximum clock frequency of 90 MHz with a propagation delay of 10.5ns at 5V and 50pF load. The device is currently classified as obsolete, which necessitates identification of active equivalent alternatives for new designs and ongoing production requirements.

Substiute Parts

SN74ACT564DBR

Texas InstrumentsIn Stock: 1012SN74ACT564DBR Datasheet

Current PartRFQ

MC74ACT374DTR2G

onsemiIn Stock: 3521MC74ACT374DTR2G Datasheet

MFR RecommendedRFQ

MC74ACT574DTR2G

onsemiIn Stock: 3575MC74ACT574DTR2G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN74ACT564DBR is determined by the following critical parameters that must remain compatible:

Functional Parameters:

• D-Type flip-flop architecture with 1 element and 8-bit configuration
• Positive edge trigger mechanism
• Tri-state output capability
• Supply voltage range: 4.5V ~ 5.5V
• Operating temperature range: -40°C ~ 85°C
• Output drive capability: 24mA high and low

Electrical Performance Parameters:

• Clock frequency rating (minimum 90 MHz required)
• Propagation delay (maximum 10.5ns at 5V, 50pF)
• Quiescent current specifications
• Input capacitance: 4.5 pF

Physical & Compliance Parameters:

• Surface mount packaging (20-pin SSOP or TSSOP variants)
• RoHS3 compliance
• MSL Level 1 (Unlimited moisture sensitivity)

The substitute parts identified below maintain functional equivalence within these parameter boundaries while offering improved product status and availability.

Parameter Comparison

Engineering Selection Recommendations

MC74ACT374DTR2G (onsemi) is suitable for applications where output logic inversion is not required. This part offers superior clock frequency performance at 160 MHz and faster propagation delay at 10ns, both exceeding the original SN74ACT564DBR specifications. The device maintains full electrical compatibility across supply voltage, output drive current, and operating temperature ranges. Active product status ensures long-term availability and supply chain continuity. The 20-TSSOP package provides a smaller footprint (0.173", 4.40mm width) compared to the original 20-SSOP package (0.209", 5.30mm width), requiring PCB layout verification for pin-to-pin compatibility.

MC74ACT574DTR2G (onsemi) provides functional equivalence with non-inverted tri-state output. Clock frequency rating of 100 MHz and propagation delay of 11ns both meet or exceed the original device specifications. This part maintains identical electrical characteristics for supply voltage, output drive capability, and operating temperature. Active product status and ROHS3 compliance ensure regulatory compliance and supply availability. The 20-TSSOP package footprint matches MC74ACT374DTR2G specifications.

Both substitute parts are classified as active products with established supply chains, addressing the obsolescence status of the original SN74ACT564DBR. Selection between these alternatives depends on output logic polarity requirements: MC74ACT374DTR2G for non-inverted output applications, or continued use of SN74ACT564DBR inventory for designs requiring inverted output logic.

Frequently Asked Questions (FAQ)

Q: Can MC74ACT374DTR2G or MC74ACT574DTR2G directly replace SN74ACT564DBR without circuit modification?

A: Direct pin-for-pin replacement is not possible due to output logic polarity differences. The SN74ACT564DBR provides inverted tri-state output, while both onsemi alternatives provide non-inverted output. Circuit logic must be evaluated to determine if output inversion is functionally required. Additionally, the package transition from 20-SSOP to 20-TSSOP requires PCB layout verification for mechanical compatibility.

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

A: MC74ACT374DTR2G operates at 160 MHz clock frequency with 10ns propagation delay, while MC74ACT574DTR2G operates at 100 MHz with 11ns propagation delay. Both exceed the original 90 MHz / 10.5ns specifications. Quiescent current increases from 4 µA to 8 µA in both substitutes. All other electrical parameters including supply voltage range, output drive current, and operating temperature remain identical.

Q: Are the substitute parts RoHS and REACH compliant?

A: Both MC74ACT374DTR2G and MC74ACT574DTR2G are ROHS3 compliant with MSL Level 1 (Unlimited moisture sensitivity). REACH status is unaffected for both parts, matching the original SN74ACT564DBR compliance profile.

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

A: The 20-SSOP package (original) measures 0.209" (5.30mm) in width, while the 20-TSSOP package (substitutes) measures 0.173" (4.40mm) in width. Both are surface mount packages with 20 pins. PCB footprint and routing must be verified for mechanical fit and electrical connectivity before implementation.

Q: Which substitute part should be selected for new designs?

A: Selection depends on application-specific requirements. MC74ACT374DTR2G is recommended for applications requiring maximum clock frequency performance (160 MHz). MC74ACT574DTR2G is suitable for applications with standard performance requirements (100 MHz). Both parts offer active product status and established supply chains. Output logic polarity requirements must be evaluated against circuit design specifications.