MM74HC574WMX Equivalent & Substitute Parts

Part Overview

The MM74HC574WMX 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 is classified as Obsolete, which necessitates identification of equivalent and substitute parts for ongoing design requirements and production continuity. The part operates across a 2V to 6V supply range with a maximum propagation delay of 27ns at 6V with 150pF load.

Key Parameters

Parameter	Value
Manufacturer Part Number	MM74HC574WMX
Manufacturer	onsemi
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	35 MHz
Max Propagation Delay @ 6V, 150pF	27ns
Trigger Type	Positive Edge
Voltage Supply Range	2V ~ 6V
Current - Output High/Low	7.8mA / 7.8mA
Current - Quiescent (Iq)	8 µA
Input Capacitance	5 pF
Operating Temperature	-40°C ~ 85°C
Package / Case	20-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the MM74HC574WMX is determined by the following critical parameters: D-Type flip-flop architecture with 1 element and 8-bit configuration, positive edge trigger operation, tri-state non-inverted output, 20-SOIC package compatibility, and electrical specifications including 2V to 6V supply voltage, 7.8mA output current capability, and propagation delay performance within acceptable ranges for the application.

Substitute parts are grouped into the following categories:

MFR Recommended Substitutes: Parts with active product status from the original manufacturer, maintaining full electrical and mechanical compatibility with enhanced or equivalent specifications.

Similar Substitutes: Parts from alternative manufacturers with identical or superior electrical performance, same package footprint, and active product status.

Parametric Equivalents: Parts with comparable functional characteristics but potential variations in propagation delay or temperature range that remain within acceptable substitution criteria.

Direct Substitutes: Parts with matching base product numbers and electrical specifications from established manufacturers with active product status.

Parameter Comparison

Parameter	MM74HC574WMX	MC74HC574ADWR2G	MC74HC574ADWG	MM74HC374WMX	CD74HC574M96	74HC574D,653	CD74HC574M	SN74HC574DW	SN74HC574DWR
Manufacturer	onsemi	onsemi	onsemi	Fairchild Semiconductor	Texas Instruments	Nexperia USA Inc.	Harris Corporation	Texas Instruments	Texas Instruments
Type	D-Type	D-Type	D-Type	D-Type	D-Type	D-Type	D-Type	D-Type	D-Type
Number of Elements	1	1	1	1	1	1	1	1	1
Number of Bits per Element	8	8	8	8	8	8	8	8	8
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	Tri-State, Non-Inverted
Clock Frequency	35 MHz	35 MHz	35 MHz	35 MHz	60 MHz	133 MHz	60 MHz	36 MHz	36 MHz
Max Propagation Delay @ 6V	27ns @ 150pF	27ns @ 50pF	27ns @ 50pF	40ns @ 150pF	28ns @ 50pF	26ns @ 50pF	28ns @ 50pF	46ns @ 150pF	46ns @ 150pF
Trigger Type	Positive Edge	Positive Edge	Positive Edge	Positive Edge	Positive Edge	Positive Edge	Positive Edge	Positive Edge	Positive Edge
Voltage Supply Range	2V ~ 6V	2V ~ 6V	2V ~ 6V	2V ~ 6V	2V ~ 6V	2V ~ 6V	2V ~ 6V	2V ~ 6V	2V ~ 6V
Current - Output High/Low	7.8mA / 7.8mA	7.8mA / 7.8mA	7.8mA / 7.8mA	7.8mA / 7.8mA	7.8mA / 7.8mA	7.8mA / 7.8mA	7.8mA / 7.8mA	7.8mA / 7.8mA	7.8mA / 7.8mA
Current - Quiescent (Iq)	8 µA	4 µA	4 µA	8 µA	8 µA	8 µA	8 µA	8 µA	8 µA
Input Capacitance	5 pF	10 pF	10 pF	5 pF	10 pF	4.6 pF	10 pF	3 pF	3 pF
Operating Temperature	-40°C ~ 85°C	-55°C ~ 125°C	-55°C ~ 125°C	-40°C ~ 85°C	-55°C ~ 125°C	-40°C ~ 125°C	-55°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	20-SOIC	20-SOIC	20-SOIC	20-SOIC	20-SOIC	20-SOIC	20-SOIC	20-SOIC	20-SOIC
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Active	Active	Active	Active	Active	Obsolete	Discontinued at DiGi Electronics	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	Not specified	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	3 (168 Hours)	3 (168 Hours)	Not specified	1 (Unlimited)	1 (Unlimited)	Not specified	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Primary Recommendation: MC74HC574ADWR2G

The MC74HC574ADWR2G is the manufacturer-recommended substitute from onsemi with Active product status. This part maintains identical functional specifications to the MM74HC574WMX while offering improved quiescent current performance (4 µA versus 8 µA) and extended operating temperature range (-55°C to 125°C). The part is ROHS3 compliant and available in Cut Tape & Digi-Reel packaging. MSL rating of 3 (168 Hours) requires standard moisture control during storage and assembly.

Secondary Recommendation: 74HC574D,653

The 74HC574D,653 from Nexperia USA Inc. is an Active product with superior clock frequency performance (133 MHz) and fastest propagation delay (26ns at 50pF load). This part offers the widest operating temperature range (-40°C to 125°C) and lowest input capacitance (4.6 pF). ROHS3 compliance and MSL 1 rating provide optimal handling characteristics. Tape & Reel packaging supports high-volume production requirements.

Alternative Recommendation: SN74HC574DWR

The SN74HC574DWR from Texas Instruments is an Active product with ROHS3 compliance and MSL 1 rating. This part maintains compatibility with the original specifications and is available in Cut Tape & Digi-Reel packaging. Operating temperature range of -40°C to 85°C matches the original part, making it suitable for applications with standard industrial temperature requirements.

Not Recommended: CD74HC574M

The CD74HC574M from Harris Corporation is Obsolete with RoHS non-compliant status, making it unsuitable for new designs or production requiring regulatory compliance.

Frequently Asked Questions (FAQ)

Q: Can MC74HC574ADWR2G directly replace MM74HC574WMX in existing designs?

A: Yes. Both parts share identical D-Type flip-flop architecture with 1 element, 8-bit configuration, positive edge triggering, tri-state non-inverted output, and 20-SOIC package footprint. Electrical specifications including supply voltage (2V to 6V), output current (7.8mA), and propagation delay (27ns at 50pF) are compatible. The MC74HC574ADWR2G offers improved quiescent current and extended temperature range as additional benefits.

Q: What is the significance of the MSL (Moisture Sensitivity Level) difference between MM74HC574WMX and MC74HC574ADWR2G?

A: MM74HC574WMX has MSL 1 (Unlimited), allowing indefinite storage without moisture control. MC74HC574ADWR2G has MSL 3 (168 Hours), requiring that the component be used within 168 hours of package opening under controlled humidity conditions (typically 30% RH or lower). Standard moisture-barrier packaging and desiccant storage address this requirement in production environments.

Q: Are all substitute parts available in the same packaging format?

A: No. Packaging varies across substitutes: MC74HC574ADWR2G and SN74HC574DWR are available in Cut Tape & Digi-Reel; MC74HC574ADWG is supplied in Tube; CD74HC574M96 and 74HC574D,653 are in Tape & Reel. Verify packaging compatibility with assembly equipment and procurement requirements before selection.

Q: Which substitute offers the best performance for high-speed applications?

A: The 74HC574D,653 from Nexperia provides the highest clock frequency (133 MHz) and fastest propagation delay (26ns at 50pF), making it optimal for timing-critical applications. However, if the original design operates at 35 MHz, any substitute with 35 MHz or higher clock frequency meets functional requirements.

Q: Is RoHS compliance mandatory for all substitutes?

A: For new designs and production in regulated markets, ROHS3 compliance is required. MC74HC574ADWR2G, MC74HC574ADWG, CD74HC574M96, 74HC574D,653, SN74HC574DW, and SN74HC574DWR are all ROHS3 compliant. CD74HC574M is RoHS non-compliant and unsuitable for applications requiring regulatory compliance.

Q: What is the difference between the 74HC574 and 74HC374 base product numbers?

A: MM74HC374WMX is a parametric equivalent with a different base product number (74HC374 versus 74HC574). While both are D-Type flip-flops with 1 element and 8-bit configuration, the 74HC374 represents a different device variant. Propagation delay is slower (40ns at 150pF versus 27ns), and quiescent current matches the original (8 µA). Substitution is possible only if timing specifications permit the longer delay.

Q: Can I use SN74HC574DW as a substitute if my application requires extended temperature operation?

A: SN74HC574DW has operating temperature range of -40°C to 85°C, matching the original MM74HC574WMX. For applications requiring extended temperature operation beyond 85°C, select MC74HC574ADWR2G (-55°C to 125°C), CD74HC574M96 (-55°C to 125°C), or 74HC574D,653 (-40°C to 125°C) instead.

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