74ACT74SC Equivalent & Substitute Parts

Part Overview

The 74ACT74SC is a dual D-type flip-flop logic integrated circuit manufactured by onsemi in 14-SOIC packaging. This component provides two independent 1-bit D-type flip-flops with complementary outputs, set/preset and reset functions, and positive edge triggering. The 74ACT74SC is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. Substitute parts maintain functional equivalence while offering improved availability and active product status from alternative manufacturers or packaging configurations.

Key Parameters

Parameter	74ACT74SC
Manufacturer	onsemi
Series	74ACT
Type	D-Type Flip-Flop
Number of Elements	2
Number of Bits per Element	1
Output Type	Complementary
Function	Set(Preset) and Reset
Trigger Type	Positive Edge
Clock Frequency	210 MHz
Max Propagation Delay @ 5V, 50pF	11ns
Voltage Supply Range	4.5V ~ 5.5V
Current Output High/Low	24mA / 24mA
Current Quiescent (Iq)	20 µA
Input Capacitance	4.5 pF
Operating Temperature	-40°C ~ 85°C
Package / Case	14-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the 74ACT74SC are classified based on functional and electrical equivalence within the 74ACT logic family. The primary substitution criteria are:

Core Electrical Parameters (Must Match or Exceed):

D-Type flip-flop configuration with 2 elements, 1 bit per element
Complementary output type with set/preset and reset functions
Positive edge trigger mechanism
Supply voltage range: 4.5V ~ 5.5V
Output current capability: 24mA high and low
Package: 14-SOIC form factor

Acceptable Variations:

Clock frequency: 74ACT74SC specifies 210 MHz; substitutes may operate at equal or higher frequencies
Propagation delay: Substitutes with equal or lower delay values are acceptable
Quiescent current: Lower values indicate improved efficiency
Input capacitance: Lower values are acceptable
Operating temperature range: Extended ranges provide additional margin
Packaging format: Tape & Reel (TR), Tube, or Cut Tape (CT) configurations are interchangeable for the same component footprint
Product status: Active parts are preferred over obsolete or discontinued classifications

Substitution Categories:

Direct Manufacturer Equivalents: Parts from onsemi with identical electrical specifications but different packaging or product status
Cross-Manufacturer Equivalents: Texas Instruments parts meeting all core electrical parameters
Upgrade Options: Parts with extended temperature ranges or improved specifications
Similar Parts: Components with minor parameter variations suitable for specific applications

Parameter Comparison

Part Number	Manufacturer	Product Status	Clock Freq (MHz)	Prop Delay @ 5V, 50pF (ns)	Iq (µA)	Input Cap (pF)	Temp Range (°C)	Packaging
74ACT74SC	onsemi	Obsolete	210	11	20	4.5	-40 ~ 85	-
MC74ACT74DR2G	onsemi	Active	210	11	4	4.5	-40 ~ 85	Tape & Reel (TR)
MC74ACT74DG	onsemi	Active	210	11	4	4.5	-40 ~ 85	Tube
74ACT11074D	Texas Instruments	Active	125	8.5	4	4.6	-40 ~ 85	Tube
SN74ACT74D	Texas Instruments	Discontinued at DiGi Electronics	210	7.5	2	3	-40 ~ 85	-
SN74ACT74DR	Texas Instruments	Active	210	7.5	2	3	-40 ~ 85	Cut Tape (CT) & Digi-Reel®
SN74ACT74MDREP	Texas Instruments	Active	210	11	2	3	-55 ~ 125	Tape & Reel (TR)
CD74ACT74M96	Texas Instruments	Active	85	9.5	4	10	-55 ~ 125	Cut Tape (CT) & Digi-Reel®
CD74ACT74QM96G4Q1	Texas Instruments	Obsolete	85	9.5	4	10	-40 ~ 125	Cut Tape (CT) & Digi-Reel®
SN74ACT74NSR	Texas Instruments	Active	210	11	2	3	-40 ~ 85	Cut Tape (CT) & Digi-Reel®

Engineering Selection Recommendations

Primary Substitutes (Recommended for Direct Replacement):

MC74ACT74DR2G and MC74ACT74DG are the preferred direct substitutes. Both are manufactured by onsemi, maintain identical electrical specifications to the 74ACT74SC, and carry active product status. MC74ACT74DR2G is supplied in Tape & Reel format suitable for automated assembly, while MC74ACT74DG is supplied in Tube format for manual handling. Both demonstrate improved quiescent current performance (4 µA versus 20 µA) and are RoHS3 compliant.

Cross-Manufacturer Alternatives:

SN74ACT74DR (Texas Instruments) provides superior electrical performance with lower propagation delay (7.5ns versus 11ns), reduced quiescent current (2 µA), and lower input capacitance (3 pF). This part maintains active product status and is available in Cut Tape & Digi-Reel packaging. SN74ACT74MDREP extends the operating temperature range to -55°C ~ 125°C while maintaining equivalent electrical specifications, suitable for applications requiring extended thermal performance.

Extended Temperature Range Option:

SN74ACT74MDREP is specified for -55°C ~ 125°C operation, providing additional thermal margin beyond the standard -40°C ~ 85°C range. This part is recommended for industrial or automotive-grade applications requiring enhanced temperature performance.

Limited Substitutes (Application-Dependent):

CD74ACT74M96 and SN74ACT74NSR operate at reduced clock frequencies (85 MHz and 210 MHz respectively) with higher input capacitance values. These parts are suitable only for applications where the reduced frequency specification does not constrain system performance. SN74ACT74NSR uses a wider 14-SOIC package (0.209", 5.30mm) compared to the standard 0.154" width; physical board layout compatibility must be verified.

Obsolete Parts (Not Recommended):

SN74ACT74D and CD74ACT74QM96G4Q1 are listed as obsolete or discontinued and should not be selected for new designs or production continuity planning.

Frequently Asked Questions (FAQ)

Q: Can MC74ACT74DR2G replace 74ACT74SC in existing designs?

A: Yes. MC74ACT74DR2G is electrically equivalent to 74ACT74SC with identical clock frequency (210 MHz), propagation delay (11ns @ 5V, 50pF), supply voltage range (4.5V ~ 5.5V), and output current specifications (24mA). The primary difference is improved quiescent current (4 µA versus 20 µA) and active product status. Packaging format differs (Tape & Reel versus unspecified), but the 14-SOIC footprint is identical.

Q: What is the difference between SN74ACT74DR and SN74ACT74D?

A: Both are Texas Instruments 74ACT74 variants with identical electrical specifications (210 MHz clock frequency, 7.5ns propagation delay, 24mA output current). SN74ACT74DR is supplied in Cut Tape & Digi-Reel packaging and maintains active product status. SN74ACT74D is listed as discontinued at DiGi Electronics. For new production, SN74ACT74DR is the recommended choice.

Q: Is SN74ACT74MDREP suitable for standard -40°C ~ 85°C applications?

A: Yes. SN74ACT74MDREP is rated for -55°C ~ 125°C operation, which encompasses the standard -40°C ~ 85°C range. This part can be used in any application requiring standard temperature performance and provides additional thermal margin for extended-range applications.

Q: Why do CD74ACT74M96 and SN74ACT74NSR have different specifications?

A: CD74ACT74M96 operates at 85 MHz clock frequency with 10 pF input capacitance, representing a different design variant within the 74ACT74 family. SN74ACT74NSR maintains 210 MHz operation with 3 pF input capacitance. These parts are suitable for different application requirements. CD74ACT74M96 is appropriate only where reduced clock frequency does not limit system performance.

Q: Can SN74ACT74NSR be used as a drop-in replacement considering its different package width?

A: SN74ACT74NSR uses a 14-SOIC package with 0.209" (5.30mm) width, compared to the standard 0.154" (3.90mm) width of 74ACT74SC. While the pin count and electrical specifications are identical, physical board layout compatibility must be verified. The wider package may not fit existing PCB footprints designed for the narrower variant. Consult PCB layout documentation before substitution.

Q: What is the inventory status of recommended substitutes?

A: MC74ACT74DR2G has 6119 pieces in stock, MC74ACT74DG has 2012 pieces, and SN74ACT74DR has 2200 pieces. All recommended primary substitutes maintain active product status with adequate inventory availability.

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