74LCX574WM Equivalent & Substitute Parts

Part Overview

The 74LCX574WM is a D-type flip-flop logic IC manufactured by onsemi, featuring 1 element with 8-bit capacity and positive edge triggering. This component operates at 150 MHz clock frequency with tri-state, non-inverted output configuration in a 20-SOIC package. The part is currently obsolete, making equivalent substitutes necessary for ongoing production and maintenance applications. Substitute parts maintain functional compatibility while offering improved availability and updated product status.

Key Parameters

Parameter	Value
Function Type	D-Type Flip Flop
Number of Elements	1
Number of Bits per Element	8
Clock Frequency	150 MHz
Output Type	Tri-State, Non-Inverted
Trigger Type	Positive Edge
Package / Case	20-SOIC (0.295", 7.50mm Width)
Voltage Supply Range	2V ~ 3.6V
Operating Temperature	-40°C ~ 85°C
Max Propagation Delay @ 3.3V, 50pF	8.5ns
Current Output High/Low	24mA / 24mA
Quiescent Current	10 µA
Input Capacitance	7 pF
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitute parts are classified based on electrical and mechanical compatibility with the 74LCX574WM. The primary substitution criteria are:

Critical Parameters for Substitution:

D-type flip-flop function with 1 element, 8-bit configuration
Positive edge trigger operation
Tri-state, non-inverted output
20-SOIC package form factor (0.295", 7.50mm Width)
Surface mount mounting type

Acceptable Variation Parameters:

Clock frequency: 150 MHz or higher
Propagation delay: 8.5ns or lower at 3.3V, 50pF load
Supply voltage range: Must encompass minimum 2V to 3.6V
Operating temperature: Must support -40°C to 85°C minimum
Output current: 24mA or higher
Quiescent current: 10 µA or lower

Direct Substitutes maintain identical electrical performance and package specifications. Similar Substitutes offer enhanced performance characteristics (lower propagation delay, higher clock frequency, extended temperature range) while maintaining functional compatibility and the same package footprint.

Parameter Comparison

Part Number	Manufacturer	Product Status	Clock Frequency	Propagation Delay @ 3.3V, 50pF	Supply Voltage	Operating Temperature	Quiescent Current	Input Capacitance	Package
74LCX574WM	onsemi	Obsolete	150 MHz	8.5ns	2V ~ 3.6V	-40°C ~ 85°C	10 µA	7 pF	20-SOIC (0.295", 7.50mm)
MC74LCX574DWR2G	onsemi	Active	150 MHz	8.5ns	2V ~ 3.6V	-40°C ~ 85°C	10 µA	7 pF	20-SOIC (0.295", 7.50mm)
SN74LVC574ADW	Texas Instruments	Active	150 MHz	6.8ns	1.65V ~ 3.6V	-40°C ~ 125°C	10 µA	4 pF	20-SOIC (0.295", 7.50mm)
74LVC574AD,112	NXP Semiconductors	Active	200 MHz	7ns	1.65V ~ 3.6V	-40°C ~ 125°C	10 µA	5 pF	20-SOIC (0.295", 7.50mm)
74LVC574AD,118	NXP Semiconductors	Active	200 MHz	7ns	1.65V ~ 3.6V	-40°C ~ 125°C	10 µA	5 pF	20-SOIC (0.295", 7.50mm)
CLVC574AQDWRG4Q1	Texas Instruments	Active	150 MHz	7ns	2V ~ 3.6V	-40°C ~ 125°C	10 µA	4 pF	20-SOIC (0.295", 7.50mm)
SN74LVC574ADWR	Texas Instruments	Active	150 MHz	6.8ns	1.65V ~ 3.6V	-40°C ~ 125°C	1.5 µA	4 pF	20-SOIC (0.295", 7.50mm)
SN74LVC574ANS	Texas Instruments	Active	150 MHz	6.8ns	1.65V ~ 3.6V	-40°C ~ 125°C	10 µA	4 pF	20-SOIC (0.209", 5.30mm)
SN74LVC574ANSR	Texas Instruments	Active	150 MHz	6.8ns	1.65V ~ 3.6V	-40°C ~ 125°C	10 µA	4 pF	20-SOIC (0.209", 5.30mm)
SN74LVC574AQDWRQ1	Texas Instruments	Active	150 MHz	7ns	2V ~ 3.6V	-40°C ~ 125°C	10 µA	4 pF	20-SOIC (0.295", 7.50mm)

Engineering Selection Recommendations

Primary Recommendation: MC74LCX574DWR2G

The MC74LCX574DWR2G from onsemi is the direct functional equivalent with identical electrical specifications and package dimensions. This part maintains the same 74LCX series lineage as the obsolete 74LCX574WM, ensuring pin-for-pin compatibility and equivalent performance characteristics. The part is currently in active production status with 2064 units in stock.

Secondary Recommendations for Enhanced Performance:

The SN74LVC574ADW, 74LVC574AD,112, 74LVC574AD,118, and SN74LVC574ADWR from Texas Instruments and NXP Semiconductors offer improved electrical performance with lower propagation delays (6.8ns to 7ns) and extended operating temperature ranges (-40°C to 125°C). These parts support the full 2V to 3.6V supply range required by the original specification and maintain the 20-SOIC (0.295", 7.50mm Width) package footprint.

Automotive Grade Option:

The CLVC574AQDWRG4Q1 and SN74LVC574AQDWRQ1 are AEC-Q100 qualified automotive-grade alternatives suitable for applications requiring automotive reliability standards. Both maintain the required package dimensions and electrical performance specifications.

Package Variant Consideration:

The SN74LVC574ANS and SN74LVC574ANSR feature a narrower 20-SOIC package (0.209", 5.30mm Width) compared to the standard 0.295" width. These parts are suitable only for designs with PCB layouts accommodating the reduced package width.

Frequently Asked Questions (FAQ)

Q: Can the MC74LCX574DWR2G directly replace the 74LCX574WM without circuit modifications?

A: Yes. The MC74LCX574DWR2G is a direct substitute with identical pin configuration, electrical specifications, and package dimensions. No circuit modifications are required.

Q: What is the difference between the 74LCX and 74LVC series substitutes?

A: Both series provide D-type flip-flop functionality with 8-bit capacity in 20-SOIC packages. The 74LVC series offers improved performance characteristics including lower propagation delays and extended operating temperature ranges. The 74LCX series maintains the original specification parameters.

Q: Are the NXP 74LVC574AD,112 and 74LVC574AD,118 parts interchangeable?

A: Yes. Both parts are functionally identical with the same electrical specifications, clock frequency (200 MHz), propagation delay (7ns), and package dimensions. The part number suffix indicates different packaging formats (Bulk vs. standard).

Q: Why do some substitutes have lower quiescent current specifications?

A: The SN74LVC574ADWR specifies 1.5 µA quiescent current compared to 10 µA in other parts. This represents improved power efficiency in the same functional package. Lower quiescent current is compatible with applications designed for the original 10 µA specification.

Q: What is the significance of the AEC-Q100 qualification on the CLVC574AQDWRG4Q1 and SN74LVC574AQDWRQ1?

A: AEC-Q100 qualification indicates these parts meet automotive industry reliability and quality standards. These variants are suitable for automotive applications requiring enhanced reliability documentation and testing.

Q: Can I use the narrower package variants (SN74LVC574ANS, SN74LVC574ANSR) as direct replacements?

A: The narrower 20-SOIC (0.209", 5.30mm Width) package is physically different from the standard 0.295" width. These parts are suitable only if your PCB layout accommodates the reduced package width. Verify footprint compatibility before selection.

Q: What supply voltage range should I verify for my application?

A: The original 74LCX574WM operates at 2V to 3.6V. Most active substitutes support 1.65V to 3.6V, which encompasses the original range. The CLVC574AQDWRG4Q1 and SN74LVC574AQDWRQ1 maintain the 2V to 3.6V range. Confirm your circuit design operates within the selected part's specified voltage range.

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