74ACT534SC Equivalent & Substitute Parts

Part Overview

The 74ACT534SC is a D-Type flip-flop logic integrated circuit manufactured by onsemi, featuring 1 element with 8-bit positive edge triggering and tri-state inverted outputs. This component operates at 100 MHz clock frequency with 11.5ns maximum propagation delay and is housed in a 20-SOIC surface mount package. The part is currently obsolete, making equivalent substitutes necessary for ongoing production and maintenance applications requiring this specific logic function and electrical performance.

Key Parameters

Parameter	Value
Manufacturer Part Number	74ACT534SC
Manufacturer	onsemi
Category	Logic
Series	74ACT
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
Current - Output High, Low	24mA, 24mA
Voltage - Supply	4.5V ~ 5.5V
Current - Quiescent (Iq)	40 µA
Input Capacitance	4.5 pF
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	20-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the 74ACT534SC is determined by strict equivalence across the following critical parameters:

Electrical Equivalence Criteria:

D-Type flip-flop architecture with 1 element and 8-bit configuration
Tri-state inverted output type
Positive edge trigger mechanism
100 MHz clock frequency capability
11.5ns maximum propagation delay at 5V, 50pF load
24mA output current (high and low)
4.5V to 5.5V supply voltage range
-40°C to 85°C operating temperature range
4.5 pF input capacitance

Mechanical Equivalence Criteria:

20-SOIC (0.295", 7.50mm Width) package
Surface mount mounting type

Substitution Classification:

Direct Manufacturer Substitute: SN74ACT534DWR (Texas Instruments, Tape & Reel packaging)

Identical electrical specifications
Active product status with full availability
Meets all parametric requirements

Parametric Equivalent: SN74ACT534DW (Texas Instruments, Tube packaging)

Identical electrical specifications
Last Time Buy product status
Meets all parametric requirements

Both substitutes maintain full compatibility with the original 74ACT534SC across all specified electrical and mechanical parameters.

Parameter Comparison

Parameter	74ACT534SC (onsemi)	SN74ACT534DWR (TI)	SN74ACT534DW (TI)
Series	74ACT	74ACT	74ACT
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, Inverted	Tri-State, Inverted
Clock Frequency	100 MHz	100 MHz	100 MHz
Max Propagation Delay @ 5V, 50pF	11.5ns	11.5ns	11.5ns
Trigger Type	Positive Edge	Positive Edge	Positive Edge
Current - Output High, Low	24mA, 24mA	24mA, 24mA	24mA, 24mA
Voltage - Supply	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V
Current - Quiescent (Iq)	40 µA	4 µA	4 µA
Input Capacitance	4.5 pF	4.5 pF	4.5 pF
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	20-SOIC (0.295", 7.50mm Width)	20-SOIC (0.295", 7.50mm Width)	20-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Active	Last Time Buy
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant
Packaging Type	Not specified	Tape & Reel (TR)	Tube

Engineering Selection Recommendations

SN74ACT534DWR (Texas Instruments, Tape & Reel) is the primary substitute for new production and high-volume applications. This part carries Active product status, ensuring long-term availability and supply chain stability. It is ROHS3 compliant and meets all electrical and mechanical specifications of the 74ACT534SC. The Tape & Reel packaging format is optimized for automated assembly processes.

SN74ACT534DW (Texas Instruments, Tube) serves as an alternative substitute for lower-volume requirements or applications where tube packaging is preferred. This part is designated Last Time Buy, indicating limited future availability. It is ROHS3 compliant and maintains full parametric equivalence with the original part. The Tube packaging format is suitable for manual assembly or small-batch operations.

Both Texas Instruments substitutes demonstrate improved quiescent current performance (4 µA versus 40 µA), representing a beneficial design enhancement while maintaining full backward compatibility.

Frequently Asked Questions (FAQ)

Q: Can SN74ACT534DWR and SN74ACT534DW be used interchangeably with 74ACT534SC?

A: Yes. Both Texas Instruments parts are electrically and mechanically equivalent to the 74ACT534SC across all specified parameters. The primary difference is packaging format (Tape & Reel versus Tube) and product lifecycle status. Selection depends on assembly method and supply chain requirements.

Q: What is the difference between the two Texas Instruments substitutes?

A: SN74ACT534DWR (Tape & Reel, Active status) and SN74ACT534DW (Tube, Last Time Buy status) are electrically identical. The distinction lies in packaging format and product availability. SN74ACT534DWR is recommended for ongoing production due to its Active status. SN74ACT534DW has limited future availability.

Q: Are there any performance differences between the original 74ACT534SC and the substitutes?

A: All critical electrical parameters are identical. The Texas Instruments substitutes feature lower quiescent current (4 µA versus 40 µA), which represents improved power efficiency without affecting functional compatibility.

Q: Is the 20-SOIC package identical across all three parts?

A: Yes. All three parts use the 20-SOIC (0.295", 7.50mm Width) surface mount package with identical pinout and mechanical dimensions, enabling direct board-level substitution.

Q: What compliance certifications apply to the substitute parts?

A: Both SN74ACT534DWR and SN74ACT534DW are ROHS3 compliant and REACH unaffected. Both carry MSL 1 (Unlimited) moisture sensitivity rating.

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