SN74ACT534DBR Equivalent & Substitute Parts

Part Overview

The SN74ACT534DBR 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 device operates at a maximum clock frequency of 100 MHz with a propagation delay of 11.5ns at 5V with 50pF load. The part is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer Part Number	SN74ACT534DBR
Manufacturer	Texas Instruments
Category	Logic
Type	D-Type Flip Flop
Number of Elements	1
Number of Bits per Element	8
Output Type	Tri-State, Inverted
Clock Frequency	100 MHz
Max Propagation Delay @ 5V, 50pF	11.5ns
Trigger Type	Positive Edge
Voltage Supply Range	4.5V ~ 5.5V
Current Output High/Low	24mA / 24mA
Quiescent Current	4 µA
Operating Temperature	-40°C ~ 85°C
Package Type	20-SSOP (0.209", 5.30mm Width)
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the SN74ACT534DBR are identified based on the following critical parameters that define functional equivalence:

Logic Family: 74ACT series (Advanced CMOS Technology)
Function: D-Type flip-flop with 1 element, 8-bit configuration
Trigger Type: Positive edge triggered
Output Configuration: Tri-state output
Voltage Supply: 4.5V ~ 5.5V compatibility
Operating Temperature Range: -40°C ~ 85°C
Package Type: Surface mount 20-pin variants (SSOP or TSSOP)
Compliance: ROHS3 compliant, REACH unaffected

The substitute parts identified are active production devices from onsemi that maintain functional compatibility with the obsolete SN74ACT534DBR while offering improved performance characteristics and current availability.

Parameter Comparison

Parameter	SN74ACT534DBR	MC74ACT374DTR2G	MC74ACT574DTR2G
Manufacturer	Texas Instruments	onsemi	onsemi
Type	D-Type Flip Flop	D-Type Flip Flop	D-Type Flip Flop
Number of Elements	1	1	1
Number of Bits per Element	8	8	8
Output Type	Tri-State, Inverted	Tri-State, Non-Inverted	Tri-State, Non-Inverted
Clock Frequency	100 MHz	160 MHz	100 MHz
Max Propagation Delay @ 5V, 50pF	11.5ns	10ns	11ns
Trigger Type	Positive Edge	Positive Edge	Positive Edge
Voltage Supply Range	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V
Current Output High/Low	24mA / 24mA	24mA / 24mA	24mA / 24mA
Quiescent Current	4 µA	8 µA	8 µA
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package Type	20-SSOP	20-TSSOP	20-TSSOP
Product Status	Obsolete	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Both MC74ACT374DTR2G and MC74ACT574DTR2G are active production alternatives to the obsolete SN74ACT534DBR. Selection between these substitutes depends on output polarity requirements:

MC74ACT374DTR2G provides tri-state non-inverted output with superior clock frequency performance (160 MHz versus 100 MHz) and marginally faster propagation delay (10ns versus 11.5ns). This device is suitable for applications where non-inverted output logic is required and higher speed operation is beneficial.

MC74ACT574DTR2G provides tri-state non-inverted output with clock frequency and propagation delay characteristics matching the original SN74ACT534DBR (100 MHz, 11ns). This device is suitable for direct functional replacement where output inversion is not a system requirement.

Both substitute parts maintain full compliance with ROHS3 and REACH requirements, operate within the identical voltage supply range (4.5V ~ 5.5V), and support the same operating temperature range (-40°C ~ 85°C). Both are available in 20-TSSOP surface mount packaging with current inventory availability.

Frequently Asked Questions (FAQ)

Q: Can MC74ACT374DTR2G or MC74ACT574DTR2G directly replace SN74ACT534DBR in existing designs?

A: Both devices are functionally compatible as D-Type 8-bit flip-flops with positive edge triggering and tri-state output. However, the SN74ACT534DBR features inverted output while both substitute parts feature non-inverted output. Circuit designs must account for this output polarity difference. Package dimensions differ slightly (SSOP versus TSSOP), but both are 20-pin surface mount configurations suitable for standard PCB layouts.

Q: What is the difference between MC74ACT374DTR2G and MC74ACT574DTR2G?

A: Both devices are 74ACT series D-Type 8-bit flip-flops with identical pin counts, voltage supply ranges, and operating temperatures. The primary differences are: MC74ACT374DTR2G operates at 160 MHz maximum clock frequency with 10ns propagation delay, while MC74ACT574DTR2G operates at 100 MHz with 11ns propagation delay. Both have quiescent current of 8 µA. Selection depends on whether the higher speed performance of MC74ACT374DTR2G is required for the application.

Q: Are there package compatibility considerations?

A: The original SN74ACT534DBR uses 20-SSOP (0.209", 5.30mm width) packaging. Both substitute parts use 20-TSSOP (0.173", 4.40mm width) packaging. While both are surface mount 20-pin packages, the TSSOP variant is narrower. PCB footprints must be verified for compatibility, though both packages are standard in modern surface mount assembly processes.

Q: Do the substitute parts meet the same compliance requirements?

A: Yes. Both MC74ACT374DTR2G and MC74ACT574DTR2G are ROHS3 compliant and REACH unaffected, matching the compliance status of the original SN74ACT534DBR. Both devices have moisture sensitivity level (MSL) of 1 (unlimited).

Q: What is the inventory status of these substitute parts?

A: MC74ACT374DTR2G has 3445 pieces in stock. MC74ACT574DTR2G has 3465 pieces in stock. Both are active production devices with current availability, unlike the obsolete SN74ACT534DBR.

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