SN74LVC574AQDWREP Equivalent & Substitute Parts

Part Overview

The SN74LVC574AQDWREP 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 classified as obsolete, which necessitates identification of active equivalent and substitute components for ongoing design support and procurement continuity. Substitute parts maintain functional equivalence while offering improved availability and active product status from multiple manufacturers.

Key Parameters

Parameter	Value
Manufacturer Part Number	SN74LVC574AQDWREP
Manufacturer	Texas Instruments
Category	Logic
Type	D-Type Flip-Flop
Number of Elements	1
Number of Bits per Element	8
Output Type	Tri-State, Non-Inverted
Clock Frequency	150 MHz
Max Propagation Delay @ 3.3V, 30pF	7 ns
Trigger Type	Positive Edge
Voltage Supply Range	2V ~ 3.6V
Current Output High/Low	24 mA / 24 mA
Quiescent Current (Iq)	10 µA
Package / Case	20-SOIC (0.295", 7.50mm Width)
Operating Temperature	-40°C ~ 125°C (TA)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict adherence to the following parameters:

Critical Matching Parameters:

Type: D-Type Flip-Flop
Number of Elements: 1
Number of Bits per Element: 8
Output Type: Tri-State, Non-Inverted
Trigger Type: Positive Edge
Package / Case: 20-SOIC (0.295", 7.50mm Width)
Operating Temperature Range: -40°C ~ 125°C (TA)

Allowable Variation Parameters:

Clock Frequency: 150 MHz or higher
Max Propagation Delay: 7 ns or lower at 3.3V
Voltage Supply Range: Must encompass or exceed 2V ~ 3.6V
Current Output: 24 mA or higher
Quiescent Current: 10 µA or lower

Substitute parts are grouped into two categories: MFR Recommended (direct manufacturer recommendations) and Parametric Equivalents (parts meeting all critical and allowable variation parameters).

Parameter Comparison

Part Number	Manufacturer	Product Status	Clock Frequency	Max Propagation Delay @ 3.3V	Voltage Supply	Quiescent Current	Operating Temp	Package
SN74LVC574AQDWREP	Texas Instruments	Obsolete	150 MHz	7 ns @ 30pF	2V ~ 3.6V	10 µA	-40°C ~ 125°C	20-SOIC
SN74LVC574ADWR	Texas Instruments	Active	150 MHz	6.8 ns @ 50pF	1.65V ~ 3.6V	1.5 µA	-40°C ~ 125°C	20-SOIC
CLVC574AQDWRG4Q1	Texas Instruments	Active	150 MHz	7 ns @ 50pF	2V ~ 3.6V	10 µA	-40°C ~ 125°C	20-SOIC
SN74LVC574AQDWRQ1	Texas Instruments	Active	150 MHz	7 ns @ 50pF	2V ~ 3.6V	10 µA	-40°C ~ 125°C	20-SOIC
74LVC374AD-Q100J	Nexperia USA Inc.	Active	150 MHz	7 ns @ 50pF	1.65V ~ 3.6V	10 µA	-40°C ~ 125°C	20-SOIC
74LVC574AD,112	NXP Semiconductors	Active	200 MHz	7 ns @ 50pF	1.65V ~ 3.6V	10 µA	-40°C ~ 125°C	20-SOIC
74LVC574AD,118	NXP Semiconductors	Active	200 MHz	7 ns @ 50pF	1.65V ~ 3.6V	10 µA	-40°C ~ 125°C	20-SOIC
MC74LCX574DWR2G	onsemi	Active	150 MHz	8.5 ns @ 50pF	2V ~ 3.6V	10 µA	-40°C ~ 85°C	20-SOIC

Engineering Selection Recommendations

Primary Recommendation: SN74LVC574ADWR (Texas Instruments)

This part is the manufacturer-recommended direct substitute from Texas Instruments. It maintains active product status, offers improved quiescent current performance (1.5 µA vs. 10 µA), and extends the lower voltage supply limit to 1.65V. Propagation delay is superior at 6.8 ns. Packaging is Tape & Reel format with 4600 units in stock.

Secondary Recommendations:

CLVC574AQDWRG4Q1 and SN74LVC574AQDWRQ1 (Texas Instruments) are parametric equivalents with automotive-grade qualification (AEC-Q100). These parts match the original specifications exactly and are suitable for applications requiring automotive-grade components.

74LVC574AD,112 and 74LVC574AD,118 (NXP Semiconductors) offer enhanced clock frequency performance at 200 MHz while maintaining all other critical parameters. Both are active products with high inventory availability (30,470 and 20,213 units respectively).

74LVC374AD-Q100J (Nexperia USA Inc.) is an automotive-qualified alternative with active status and extended lower voltage supply range to 1.65V.

Consideration for MC74LCX574DWR2G (onsemi):

This part meets functional requirements but operates at a reduced maximum temperature of -40°C to 85°C (versus -40°C to 125°C for other substitutes) and has slightly higher propagation delay at 8.5 ns. Select this part only if the reduced temperature range is acceptable for the application.

Frequently Asked Questions (FAQ)

Q: Can SN74LVC574ADWR directly replace SN74LVC574AQDWREP?

A: Yes. SN74LVC574ADWR is the manufacturer-recommended substitute from Texas Instruments. Both parts are D-type flip-flops with 1 element, 8-bit configuration, tri-state non-inverted output, positive edge triggering, and 20-SOIC packaging. The substitute offers improved performance with lower quiescent current and faster propagation delay.

Q: What is the difference between the Texas Instruments 74LVC and onsemi 74LCX series?

A: Both are logic flip-flop families with equivalent functional specifications. The primary difference is propagation delay: 74LVC parts achieve 6.8-7 ns at 3.3V with 50pF load, while MC74LCX574DWR2G achieves 8.5 ns under the same conditions. The 74LCX part also has a reduced maximum operating temperature of 85°C versus 125°C for 74LVC parts.

Q: Are automotive-grade parts (AEC-Q100) required for this application?

A: Automotive qualification is not required unless specified by application requirements. CLVC574AQDWRG4Q1 and SN74LVC574AQDWRQ1 carry AEC-Q100 qualification; standard-grade alternatives are available from the same manufacturers if automotive qualification is not needed.

Q: What is the significance of the part number suffixes (,112 and ,118)?

A: These suffixes indicate packaging and distribution format designations from NXP Semiconductors. Both 74LVC574AD,112 and 74LVC574AD,118 are functionally identical D-type flip-flops with identical electrical specifications. The suffix reflects internal NXP classification for packaging and supply chain management.

Q: Can I use parts with higher clock frequency ratings as substitutes?

A: Yes. 74LVC574AD,112 and 74LVC574AD,118 operate at 200 MHz versus the original 150 MHz specification. Higher clock frequency ratings indicate enhanced performance capability and are fully compatible with applications designed for 150 MHz operation.

Q: What packaging formats are available for these substitutes?

A: All substitute parts are available in 20-SOIC surface mount package. Packaging formats vary: SN74LVC574ADWR is supplied in Tape & Reel format; CLVC574AQDWRG4Q1 and SN74LVC574AQDWRQ1 in Tape & Reel; 74LVC574AD,112 in Bulk; 74LVC574AD,118 in standard format; MC74LCX574DWR2G in Cut Tape format. Verify packaging requirements with procurement specifications.

Q: Is the voltage supply range difference significant?

A: Parts with extended lower voltage limits (1.65V vs. 2V) offer broader operating range compatibility. SN74LVC574ADWR, 74LVC374AD-Q100J, 74LVC574AD,112, and 74LVC574AD,118 support 1.65V minimum supply. If your application operates above 2V, this difference is not critical. If lower voltage operation is required, select parts with 1.65V minimum rating.

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