SN74LS74ADRG4 Equivalent & Substitute Parts

Part Overview

The SN74LS74ADRG4 is a dual D-type flip-flop logic integrated circuit manufactured by Texas Instruments, housed in a 14-SOIC surface mount package. This component provides two independent D-type flip-flops with Set (Preset) and Reset functions, operating at a clock frequency of 33 MHz with complementary outputs. The part is currently discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives that maintain electrical and mechanical compatibility for ongoing production and maintenance applications.

Substiute Parts

SN74LS74ADRG4

Texas InstrumentsIn Stock: 907SN74LS74ADRG4 Datasheet

Current PartRFQ

SN74LS74ADR

Texas InstrumentsIn Stock: 2981SN74LS74ADR Datasheet

MFR RecommendedRFQ

74ABT74D,118

Nexperia USA Inc.In Stock: 406074ABT74D,118 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the SN74LS74ADRG4 is determined by strict equivalence across the following critical parameters:

Functional Requirements:

• Dual D-type flip-flop architecture with 2 elements, 1 bit per element
• Complementary output configuration
• Set (Preset) and Reset functionality
• Positive edge trigger mechanism

Electrical Compatibility:

• Supply voltage range must encompass or match 4.75V ~ 5.25V
• Clock frequency capability must meet or exceed 33 MHz
• Propagation delay performance must be acceptable for the application
• Output current drive capability must support connected loads

Mechanical Compatibility:

• 14-SOIC (0.154", 3.90mm Width) package footprint
• Surface mount mounting type

Regulatory & Compliance:

• ROHS3 compliance maintained
• MSL rating of 1 (Unlimited) or equivalent

The identified substitute parts maintain functional equivalence while offering either active product status or enhanced electrical performance characteristics.

Parameter Comparison

Engineering Selection Recommendations

SN74LS74ADR (Texas Instruments): This substitute maintains identical electrical specifications to the SN74LS74ADRG4 while offering active product status. Both parts operate within the same supply voltage range (4.75V ~ 5.25V), share identical clock frequency (33 MHz) and propagation delay characteristics (40 ns @ 5V, 15pF), and are housed in the same 14-SOIC package. This part is the direct functional equivalent and is recommended for applications requiring pin-for-pin compatibility with minimal design modification. ROHS3 compliance and MSL rating of 1 (Unlimited) are maintained.

74ABT74D,118 (Nexperia USA Inc.): This substitute provides enhanced electrical performance with a significantly higher clock frequency (250 MHz) and reduced propagation delay (4.2 ns @ 5V, 50pF). The supply voltage range is slightly broader (4.5V ~ 5.5V), and quiescent current is substantially lower (50 µA versus 8 mA). Output current drive capability is increased (15mA/20mA versus 400µA/8mA). Operating temperature range extends to -40°C ~ 85°C. This part is suitable for applications where improved speed performance and lower power consumption are beneficial, though design verification is necessary to confirm compatibility with existing circuit requirements. ROHS3 compliance and MSL rating of 1 (Unlimited) are maintained.

Both substitute parts maintain the same functional architecture (dual D-type flip-flops with complementary outputs, Set/Reset functions, and positive edge triggering) and identical package footprint, ensuring mechanical compatibility with existing PCB layouts.

Frequently Asked Questions (FAQ)

Q: Can the SN74LS74ADR be used as a direct replacement for the SN74LS74ADRG4?

A: Yes. The SN74LS74ADR is electrically and mechanically equivalent to the SN74LS74ADRG4. Both parts share identical specifications for supply voltage, clock frequency, propagation delay, output current, and operating temperature range. The 14-SOIC package footprint is identical, enabling direct PCB substitution without design modification.

Q: What are the key differences between the 74ABT74D,118 and the SN74LS74ADRG4?

A: The 74ABT74D,118 offers superior electrical performance with 250 MHz clock frequency (versus 33 MHz), significantly reduced propagation delay (4.2 ns versus 40 ns), and lower quiescent current (50 µA versus 8 mA). The supply voltage range is slightly broader (4.5V ~ 5.5V versus 4.75V ~ 5.25V), and output current drive is higher (15mA/20mA versus 400µA/8mA). Operating temperature range extends to -40°C ~ 85°C. The 14-SOIC package footprint remains identical.

Q: Are all three parts housed in the same package?

A: Yes. The SN74LS74ADRG4, SN74LS74ADR, and 74ABT74D,118 are all housed in the 14-SOIC (0.154", 3.90mm Width) surface mount package, ensuring identical PCB footprint compatibility.

Q: Do the substitute parts maintain RoHS3 compliance?

A: Yes. Both the SN74LS74ADR and 74ABT74D,118 are ROHS3 compliant with MSL rating of 1 (Unlimited), matching the compliance status of the SN74LS74ADRG4.

Q: Which substitute part should be selected for a new design?

A: Selection depends on application requirements. For direct functional equivalence with active product availability, the SN74LS74ADR is recommended. For applications requiring enhanced speed performance, lower power consumption, or extended operating temperature range, the 74ABT74D,118 is suitable. Both parts are functionally compatible with the original SN74LS74ADRG4 architecture.

Q: What is the difference between the packaging designations (ADRG4 versus ADR)?

A: The SN74LS74ADRG4 and SN74LS74ADR differ in packaging format. The ADRG4 designation indicates a specific packaging configuration (Digi-Reel format), while ADR represents the base part number available in multiple packaging options including Cut Tape (CT) and Digi-Reel. The electrical specifications and 14-SOIC footprint remain identical.