SN74LVC574ADWRE4 Equivalent & Substitute Parts

Part Overview

The SN74LVC574ADWRE4 is a D-Type flip-flop logic integrated circuit manufactured by Texas Instruments, featuring 1 element with 8-bit positive edge triggering in a 20-SOIC package. This part is discontinued at DiGi Electronics, making equivalent and substitute parts necessary for ongoing design support and procurement. The device operates across a supply voltage range of 1.65V to 3.6V with a maximum clock frequency of 150 MHz and propagation delay of 6.8ns at 3.3V with 50pF load.

Substiute Parts

SN74LVC574ADWRE4

Texas InstrumentsIn Stock: 1084SN74LVC574ADWRE4 Datasheet

Current PartRFQ

SN74LVC574ADWR

Texas InstrumentsIn Stock: 4649SN74LVC574ADWR Datasheet

Parametric EquivalentRFQ

74LVC574AD,112

NXP SemiconductorsIn Stock: 3050974LVC574AD,112 Datasheet

MFR RecommendedRFQ

74LVC574AD,118

NXP SemiconductorsIn Stock: 2024874LVC574AD,118 Datasheet

MFR RecommendedRFQ

MC74LCX574DWR2G

onsemiIn Stock: 2138MC74LCX574DWR2G Datasheet

MFR RecommendedRFQ

74LVC374AD,118

Nexperia USA Inc.In Stock: 273074LVC374AD,118 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SN74LVC574ADWRE4 is determined by the following critical parameters:

• Functional equivalence: D-Type flip-flop with 1 element, 8-bit configuration, positive edge trigger, tri-state non-inverted output
• Electrical compatibility: Supply voltage range 1.65V ~ 3.6V, output drive capability 24mA/24mA, operating temperature -40°C ~ 125°C
• Package compatibility: 20-SOIC (0.295", 7.50mm Width) surface mount package
• Performance threshold: Clock frequency minimum 150 MHz, propagation delay maximum 6.8ns @ 3.3V, 50pF load
• Compliance requirements: ROHS3 compliant, MSL rating 1 or equivalent

Substitute parts are grouped into two categories: parametric equivalents (identical electrical and mechanical specifications) and manufacturer-recommended alternatives (functionally equivalent with minor parameter variations within acceptable design margins).

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: SN74LVC574ADWR (Texas Instruments)

The SN74LVC574ADWR is the direct parametric equivalent with identical electrical specifications and package configuration. It maintains the same 150 MHz clock frequency, 6.8ns propagation delay, and 4 pF input capacitance. The primary advantage is improved quiescent current at 1.5 µA versus 10 µA on the original part, reducing power consumption in standby conditions. This part is active and ROHS3 compliant with MSL 1 rating. Packaging is Tape & Reel (TR) format with 4600 units in stock.

Secondary Substitutes: 74LVC574AD,112 and 74LVC574AD,118 (NXP Semiconductors)

Both NXP variants are manufacturer-recommended alternatives with enhanced clock frequency of 200 MHz and slightly increased propagation delay of 7ns. These parts maintain full electrical compatibility within the 1.65V ~ 3.6V supply range and identical output drive capability. The 74LVC574AD,112 is supplied in bulk packaging, while 74LVC574AD,118 is available in standard packaging. Both are active products with high inventory availability (30,470 and 20,213 units respectively). These parts are suitable for applications where the additional 50 MHz frequency margin provides design headroom.

Alternative Substitute: MC74LCX574DWR2G (onsemi)

The MC74LCX574DWR2G from onsemi's 74LCX series is functionally equivalent with identical 150 MHz clock frequency and 8-bit D-Type configuration. This part exhibits slightly higher propagation delay of 8.5ns and increased input capacitance of 7 pF. The supply voltage range is narrower at 2V ~ 3.6V (versus 1.65V minimum on the main part), and the operating temperature range is limited to -40°C ~ 85°C. MSL rating is 3 (168 hours), requiring controlled storage conditions. This option is suitable for applications not requiring the extended low-voltage operation or full temperature range of the main part.

Functional Variant: 74LVC374AD,118 (Nexperia USA Inc.)

The 74LVC374AD,118 is a parametric equivalent from Nexperia with identical electrical specifications to the main part. This part represents a functional variant within the 74LVC family and maintains all critical parameters including 150 MHz frequency, 7ns propagation delay, and 4 pF input capacitance. It is active with 2,704 units in stock, ROHS3 compliant, and MSL 1 rated. Selection of this part should be based on design requirements specific to the 74LVC374 variant architecture.

Frequently Asked Questions (FAQ)

Q: Can SN74LVC574ADWR be used as a direct replacement for SN74LVC574ADWRE4?

A: Yes. The SN74LVC574ADWR is a parametric equivalent with identical electrical specifications, package configuration, and functional behavior. The primary difference is improved quiescent current (1.5 µA versus 10 µA) and packaging format (Tape & Reel versus the original format). Both are ROHS3 compliant with MSL 1 rating.

Q: What are the key differences between the Texas Instruments and NXP variants?

A: The NXP 74LVC574AD,112 and 74LVC574AD,118 offer enhanced clock frequency of 200 MHz compared to 150 MHz on the Texas Instruments parts. Propagation delay increases slightly from 6.8ns to 7ns. All other electrical parameters remain compatible. The NXP parts are suitable for applications requiring additional frequency margin.

Q: Is the MC74LCX574DWR2G from onsemi fully compatible?

A: The MC74LCX574DWR2G is functionally equivalent but with design constraints. The supply voltage minimum is 2V (versus 1.65V), operating temperature maximum is 85°C (versus 125°C), and MSL rating is 3 requiring controlled storage. Use this part only in applications that do not require extended low-voltage operation or full temperature range.

Q: Are all substitute parts available in the same package?

A: All substitute parts use the 20-SOIC (0.295", 7.50mm Width) surface mount package, ensuring mechanical and electrical compatibility on existing PCB layouts. Packaging formats (bulk, tape & reel, cut tape) vary by supplier but do not affect board-level integration.

Q: What compliance certifications apply to all substitute parts?

A: All primary substitutes (SN74LVC574ADWR, 74LVC574AD,112, 74LVC574AD,118, and 74LVC374AD,118) are ROHS3 compliant with MSL 1 rating. The MC74LCX574DWR2G is ROHS3 compliant with MSL 3 rating. All parts are REACH unaffected and classified as EAR99 for export control purposes.

Q: Which substitute offers the best power efficiency?

A: The SN74LVC574ADWR provides the lowest quiescent current at 1.5 µA, compared to 10 µA on all other variants. This results in reduced standby power consumption and is beneficial for battery-powered or low-power applications.

Q: Can I mix different substitute parts in the same design?

A: Yes, all substitute parts are pin-compatible and functionally equivalent. However, mixing parts from different manufacturers or series may complicate supply chain management and qualification testing. Standardizing on a single substitute part is recommended for production designs.