74LCX574WMX Equivalent & Substitute Parts

Part Overview

The 74LCX574WMX is a D-type flip-flop logic integrated circuit manufactured by onsemi, featuring 1 element with 8-bit positive edge triggering in a 20-SOIC package. This component operates at a clock frequency of 150 MHz with tri-state, non-inverted outputs and is designed for low-voltage applications ranging from 2V to 3.6V supply voltage.

The 74LCX574WMX is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this logic function.

Key Parameters

Parameter	Value
Manufacturer Part Number	74LCX574WMX
Manufacturer	onsemi
Category	Logic
Package / Case	20-SOIC (0.295", 7.50mm Width)
Type	D-Type Flip-Flop
Number of Elements	1
Number of Bits per Element	8
Clock Frequency	150 MHz
Max Propagation Delay @ 3.3V, 50pF	8.5 ns
Trigger Type	Positive Edge
Output Type	Tri-State, Non-Inverted
Current - Output High, Low	24 mA, 24 mA
Voltage - Supply	2V ~ 3.6V
Current - Quiescent (Iq)	10 µA
Input Capacitance	7 pF
Operating Temperature	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount
Product Status	Obsolete
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the 74LCX574WMX are classified into two categories based on electrical and mechanical compatibility:

Direct Manufacturer Equivalent (Same Base Product Number - 74LCX574):

MC74LCX574DWR2G (onsemi) - Identical electrical specifications and package, active product status with improved availability

Parametric Equivalent (Different Base Product Number - 74LCX374):

MC74LCX374DWR2G (onsemi) - Shares identical electrical parameters and 20-SOIC package; differs only in internal latch configuration

Similar Alternatives (74LVC Series - NXP Semiconductors and Texas Instruments):

74LVC574AD,112 (NXP)
74LVC574AD,118 (NXP)
SN74LVC574ADW (Texas Instruments)
SN74LVC574ADWR (Texas Instruments)
SN74LVC574AQDWRQ1 (Texas Instruments - Automotive Grade)

Substitution eligibility is determined by the following key parameters: package type (20-SOIC), flip-flop type (D-Type), number of bits (8-bit), output configuration (tri-state, non-inverted), trigger type (positive edge), and supply voltage compatibility. All listed substitutes maintain these core electrical and mechanical characteristics.

Parameter Comparison

Parameter	74LCX574WMX (Main)	MC74LCX574DWR2G	MC74LCX374DWR2G	74LVC574AD,112	74LVC574AD,118	SN74LVC574ADW	SN74LVC574ADWR	SN74LVC574AQDWRQ1
Manufacturer	onsemi	onsemi	onsemi	NXP	NXP	Texas Instruments	Texas Instruments	Texas Instruments
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active
Type	D-Type	D-Type	D-Type	D-Type	D-Type	D-Type	D-Type	D-Type
Number of Bits	8	8	8	8	8	8	8	8
Package / Case	20-SOIC	20-SOIC	20-SOIC	20-SOIC	20-SOIC	20-SOIC	20-SOIC	20-SOIC
Output Type	Tri-State, Non-Inverted	Tri-State, Non-Inverted	Tri-State, Non-Inverted	Tri-State, Non-Inverted	Tri-State, Non-Inverted	Tri-State, Non-Inverted	Tri-State, Non-Inverted	Tri-State, Non-Inverted
Trigger Type	Positive Edge	Positive Edge	Positive Edge	Positive Edge	Positive Edge	Positive Edge	Positive Edge	Positive Edge
Clock Frequency	150 MHz	150 MHz	150 MHz	200 MHz	200 MHz	150 MHz	150 MHz	150 MHz
Max Propagation Delay @ 3.3V, 50pF	8.5 ns	8.5 ns	8.5 ns	7 ns	7 ns	6.8 ns	6.8 ns	7 ns
Current - Output High, Low	24 mA, 24 mA	24 mA, 24 mA	24 mA, 24 mA	24 mA, 24 mA	24 mA, 24 mA	24 mA, 24 mA	24 mA, 24 mA	24 mA, 24 mA
Voltage - Supply	2V ~ 3.6V	2V ~ 3.6V	2V ~ 3.6V	1.65V ~ 3.6V	1.65V ~ 3.6V	1.65V ~ 3.6V	1.65V ~ 3.6V	2V ~ 3.6V
Current - Quiescent (Iq)	10 µA	10 µA	10 µA	10 µA	10 µA	10 µA	1.5 µA	10 µA
Input Capacitance	7 pF	7 pF	7 pF	5 pF	5 pF	4 pF	4 pF	4 pF
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	Not specified	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	3 (168 Hours)	3 (168 Hours)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Grade	Standard	Standard	Standard	Standard	Standard	Standard	Standard	Automotive (AEC-Q100)

Engineering Selection Recommendations

Primary Substitute - MC74LCX574DWR2G (onsemi): This part is the direct manufacturer equivalent with identical electrical specifications and 20-SOIC package. It maintains active product status, ensuring long-term availability. The primary consideration is the increased moisture sensitivity level (MSL 3 versus MSL 1), which requires appropriate handling during storage and assembly if the original design specified unlimited moisture exposure conditions.

Secondary Substitute - MC74LCX374DWR2G (onsemi): This parametric equivalent shares all critical electrical parameters and package configuration. The internal latch configuration differs from the 74LCX574, but electrical performance remains identical. Active product status supports supply chain continuity.

Alternative Substitutes - 74LVC Series (NXP and Texas Instruments): The 74LVC574 variants from NXP and Texas Instruments provide functional equivalence with enhanced performance characteristics. These parts feature improved propagation delay (6.8-7 ns versus 8.5 ns), extended operating temperature range (-40°C to 125°C versus -40°C to 85°C), and ROHS3 compliance. The 74LVC series supports lower supply voltages (1.65V minimum versus 2V minimum). All variants maintain the 20-SOIC package and tri-state, non-inverted output configuration.

Automotive-Grade Option - SN74LVC574AQDWRQ1 (Texas Instruments): This variant is qualified to AEC-Q100 automotive standards and is suitable for applications requiring automotive-grade components. It maintains all electrical compatibility with the original part while providing extended temperature range operation.

Frequently Asked Questions (FAQ)

Q: Can MC74LCX574DWR2G directly replace 74LCX574WMX without circuit modifications?

A: Yes. MC74LCX574DWR2G is the direct manufacturer equivalent with identical electrical specifications, package type, and pin configuration. No circuit modifications are required. The primary consideration is moisture sensitivity level handling during assembly and storage.

Q: What is the difference between MC74LCX574DWR2G and MC74LCX374DWR2G?

A: Both parts share identical electrical parameters and 20-SOIC packaging. The internal latch configuration differs between the 74LCX574 and 74LCX374 designs, but this does not affect electrical performance or pin compatibility. Selection depends on the specific latch function required by the application.

Q: Are the 74LVC574 variants from NXP and Texas Instruments compatible with the 74LCX574WMX?

A: Yes, the 74LVC574 variants are functionally compatible. All maintain the 20-SOIC package, 8-bit D-type flip-flop configuration, tri-state non-inverted outputs, and positive edge triggering. The 74LVC series offers improved performance with faster propagation delay and extended operating temperature range. Supply voltage compatibility is maintained, though the 74LVC series supports lower minimum voltages (1.65V versus 2V).

Q: What is the significance of the MSL (Moisture Sensitivity Level) difference between the main part and substitutes?

A: The 74LCX574WMX has MSL 1 (unlimited moisture exposure), while MC74LCX574DWR2G has MSL 3 (168 hours maximum). MSL 3 components require controlled storage conditions and must be baked before reflow soldering if moisture absorption limits are exceeded. Design environments with strict moisture control can use MSL 3 parts without impact; environments without such controls should consider MSL 1 alternatives.

Q: Is the SN74LVC574AQDWRQ1 suitable for non-automotive applications?

A: Yes. The SN74LVC574AQDWRQ1 is AEC-Q100 qualified but functions identically to standard-grade 74LVC574 variants. It can be used in any application requiring the 74LVC574 electrical specifications. Automotive qualification does not restrict use in non-automotive designs.

Q: What packaging options are available for these substitutes?

A: All listed substitutes are available in 20-SOIC surface mount packages. Packaging variants (Cut Tape, Tape & Reel, Bulk, Tube) differ by supplier and manufacturer but do not affect electrical compatibility. Selection of packaging type depends on procurement and assembly requirements.

Q: Can I use 74LVC574 parts in designs originally specified for 74LCX574?

A: Yes. The 74LVC574 series maintains full electrical compatibility with the 74LCX574 in terms of logic function, package, and pin configuration. The 74LVC series offers superior performance characteristics including faster propagation delay and extended temperature range, making it suitable for direct substitution in existing designs.

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