SN74ACT534DBRE4 Equivalent & Substitute Parts

Part Overview

The SN74ACT534DBRE4 is a D-Type flip-flop logic integrated circuit manufactured by Texas Instruments, featuring 1 element with 8-bit parallel data storage capability. This device operates as a standard positive edge-triggered flip-flop with tri-state inverted outputs, designed for high-speed digital logic applications. The part is classified as obsolete, making equivalent and substitute components necessary for ongoing design support and procurement continuity.

Substiute Parts

SN74ACT534DBRE4

Texas InstrumentsIn Stock: 968SN74ACT534DBRE4 Datasheet

Current PartRFQ

SN74AC534DBR

Texas InstrumentsIn Stock: 3128SN74AC534DBR Datasheet

MFR RecommendedRFQ

MC74ACT374DTR2G

onsemiIn Stock: 3521MC74ACT374DTR2G Datasheet

MFR RecommendedRFQ

MC74ACT574DTR2G

onsemiIn Stock: 3575MC74ACT574DTR2G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN74ACT534DBRE4 is determined by the following critical parameters:

Functional Equivalence Requirements:

• D-Type flip-flop architecture with 8-bit parallel storage
• Positive edge trigger configuration
• Tri-state output capability
• 1 element configuration

Electrical Compatibility Parameters:

• Supply voltage range (minimum 4.5V ~ 5.5V required)
• Clock frequency performance (minimum 100 MHz)
• Propagation delay specifications (maximum 11.5 ns @ 5V, 50pF)
• Output drive current (24 mA minimum)
• Operating temperature range (-40°C ~ 85°C)

Physical and Compliance Requirements:

• Surface mount packaging (20-pin SSOP or equivalent)
• ROHS3 compliance
• MSL Level 1 (Unlimited moisture sensitivity)

The substitute parts listed below meet these core requirements while offering enhanced performance characteristics or improved product availability status.

Parameter Comparison

Engineering Selection Recommendations

SN74AC534DBR (Primary Substitute - Texas Instruments)

This part is the manufacturer-recommended substitute for the obsolete SN74ACT534DBRE4. Both devices maintain identical functional architecture and output inversion characteristics. The SN74AC534DBR offers improved performance with 150 MHz clock frequency and 10.5 ns propagation delay, while maintaining the same 24 mA output drive capability. The expanded supply voltage range (2V ~ 6V) provides additional design flexibility. Active product status ensures long-term availability and supply chain continuity. Package compatibility is direct (20-SSOP). This substitute is the preferred choice for direct replacement applications.

MC74ACT374DTR2G (onsemi Alternative)

This device provides functional equivalence with enhanced performance specifications (160 MHz clock frequency, 10 ns propagation delay). The primary design consideration is the output configuration: this part features non-inverted tri-state outputs, requiring logic inversion in the signal path if the original inverted output behavior is required. Package format differs slightly (20-TSSOP vs. 20-SSOP), necessitating PCB layout modification. Active product status and ROHS3 compliance are maintained. Quiescent current is elevated to 8 µA. Selection of this part is appropriate when output inversion can be accommodated in system design.

MC74ACT574DTR2G (onsemi Alternative)

This device maintains the same functional architecture and non-inverted output configuration as the MC74ACT374DTR2G. Clock frequency and propagation delay specifications match the original SN74ACT534DBRE4 (100 MHz, 11 ns). The 20-TSSOP package requires PCB layout modification. Quiescent current is 8 µA. This substitute is suitable for applications where output inversion accommodation is feasible and package footprint modification is acceptable.

Frequently Asked Questions (FAQ)

Q: Can the SN74AC534DBR directly replace the SN74ACT534DBRE4 without circuit modifications?

A: Yes. The SN74AC534DBR is the manufacturer-recommended substitute and maintains functional and electrical compatibility. Both devices feature identical 8-bit D-Type flip-flop architecture, tri-state inverted outputs, positive edge triggering, and 20-SSOP packaging. The SN74AC534DBR operates within the required supply voltage range and meets or exceeds all timing specifications of the original part.

Q: What is the key difference between the onsemi alternatives (MC74ACT374DTR2G and MC74ACT574DTR2G) and the original part?

A: The primary difference is output polarity. The onsemi parts feature non-inverted tri-state outputs, whereas the SN74ACT534DBRE4 has inverted outputs. If the system design depends on inverted output logic levels, additional inverter logic must be incorporated. Both onsemi devices use 20-TSSOP packaging instead of 20-SSOP, requiring PCB footprint modification.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts (SN74AC534DBR, MC74ACT374DTR2G, and MC74ACT574DTR2G) are ROHS3 compliant with MSL Level 1 (Unlimited) moisture sensitivity rating, matching the compliance profile of the original SN74ACT534DBRE4.

Q: What are the packaging differences between the substitute parts?

A: The SN74AC534DBR uses 20-SSOP (0.209", 5.30mm width) packaging, identical to the original part. The onsemi alternatives (MC74ACT374DTR2G and MC74ACT574DTR2G) use 20-TSSOP (0.173", 4.40mm width) packaging. The TSSOP package is narrower and requires PCB layout redesign for pin-to-pad routing and component placement.

Q: Which substitute part offers the best performance improvement?

A: The MC74ACT374DTR2G provides the highest clock frequency (160 MHz) and fastest propagation delay (10 ns @ 5V, 50pF). However, performance selection must be balanced against output polarity requirements and packaging constraints specific to the application.

Q: Can the SN74AC534DBR operate at supply voltages below 4.5V?

A: The SN74AC534DBR supports supply voltages from 2V to 6V, providing operation at voltages below the original part's 4.5V minimum. This expanded range may enable operation in lower-voltage system designs, though timing specifications should be verified for the specific operating voltage.