MM74HC574WM Equivalent & Substitute Parts

Part Overview

The MM74HC574WM is a D-type flip-flop logic integrated circuit manufactured by onsemi, featuring 1 element with 8-bit parallel data storage capability. This device operates as a positive edge-triggered flip-flop with tri-state, non-inverted outputs in a 20-SOIC surface mount package. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer Part Number	MM74HC574WM
Manufacturer	onsemi
Series	74HC
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
Clock Frequency	35 MHz
Max Propagation Delay	27 ns @ 6V, 150pF
Voltage Supply Range	2V ~ 6V
Current Output High/Low	7.8 mA / 7.8 mA
Quiescent Current (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	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the MM74HC574WM are classified based on strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

D-Type flip-flop architecture with 1 element, 8-bit configuration
Positive edge trigger functionality
Tri-state, non-inverted output configuration
20-SOIC surface mount package (0.295", 7.50mm Width)
Voltage supply range compatibility (minimum 2V ~ 6V overlap required)
Operating temperature range overlap with -40°C minimum

Substitution Categories:

Direct Manufacturer Equivalents maintain identical electrical specifications and are sourced from different manufacturers or packaging variants of the same base product number (74HC574).

MFR Recommended Substitutes are active production alternatives from the original manufacturer with enhanced specifications or extended temperature ranges.

Similar Manufacturer Parts share core functionality and package specifications but may have variations in propagation delay, quiescent current, or clock frequency within acceptable operational parameters.

Parametric Equivalents function identically in circuit applications but use different base product numbers (such as 74HC374) with matching electrical characteristics.

Parameter Comparison

Part Number	Manufacturer	Series	Clock Frequency (MHz)	Max Propagation Delay (ns)	Voltage Supply (V)	Iq (µA)	Operating Temp (°C)	Product Status	Package
MM74HC574WM	onsemi	74HC	35	27 @ 6V, 150pF	2 ~ 6	8	-40 ~ 85	Obsolete	20-SOIC (7.50mm)
74VHC574M	Fairchild Semiconductor	74VHC	115	10.6 @ 5V, 50pF	2 ~ 5.5	4	-40 ~ 85	Active	20-SOIC (7.50mm)
MC74HC574ADWG	onsemi	74HC	35	27 @ 6V, 50pF	2 ~ 6	4	-55 ~ 125	Active	20-SOIC (7.50mm)
MC74HC574ADWR2G	onsemi	74HC	35	27 @ 6V, 50pF	2 ~ 6	4	-55 ~ 125	Active	20-SOIC (7.50mm)
MM74HC374WM	Fairchild Semiconductor	74HC	35	40 @ 6V, 150pF	2 ~ 6	8	-40 ~ 85	Active	20-SOIC (7.50mm)
CD74HC574M	Harris Corporation	74HC	60	28 @ 6V, 50pF	2 ~ 6	8	-55 ~ 125	Obsolete	20-SOIC (7.50mm)
74HC574D,653	Nexperia USA Inc.	74HC	133	26 @ 6V, 50pF	2 ~ 6	8	-40 ~ 125	Active	20-SOIC (7.50mm)
CD74HC574M96	Texas Instruments	74HC	60	28 @ 6V, 50pF	2 ~ 6	8	-55 ~ 125	Active	20-SOIC (7.50mm)
SN74HC574DW	Texas Instruments	74HC	36	46 @ 6V, 150pF	2 ~ 6	8	-40 ~ 85	Discontinued at DiGi Electronics	20-SOIC (7.50mm)
SN74HC574DWR	Texas Instruments	74HC	36	46 @ 6V, 150pF	2 ~ 6	8	-40 ~ 85	Active	20-SOIC (7.50mm)
SN74HC574NSR	Texas Instruments	74HC	40	31 @ 6V, 50pF	2 ~ 6	8	-40 ~ 85	Active	20-SO (5.30mm)

Engineering Selection Recommendations

For Active Production Designs:

MC74HC574ADWG and MC74HC574ADWR2G are the primary recommended substitutes. Both are manufactured by onsemi (original manufacturer of MM74HC574WM), maintain identical electrical specifications, and are in active production status. These parts offer extended operating temperature range (-55°C ~ 125°C) and reduced quiescent current (4 µA vs. 8 µA), providing improved thermal and power performance. Both are ROHS3 compliant with MSL 3 rating.

74HC574D,653 (Nexperia USA Inc.) is an active alternative offering superior clock frequency (133 MHz) and faster propagation delay (26 ns), suitable for applications requiring enhanced speed performance while maintaining full electrical compatibility.

CD74HC574M96 (Texas Instruments) provides active production status with extended temperature range (-55°C ~ 125°C) and is ROHS3 compliant, making it suitable for industrial and automotive applications.

For Legacy System Maintenance:

SN74HC574DWR (Texas Instruments) is actively produced and maintains specifications closely aligned with the original MM74HC574WM, offering direct functional replacement with established supply chain availability.

For Enhanced Performance:

74VHC574M (Fairchild Semiconductor) operates at higher clock frequency (115 MHz) with faster propagation delay (10.6 ns) and lower quiescent current (4 µA). Note that the maximum supply voltage is reduced to 5.5V, requiring verification of circuit voltage compatibility.

Package Consideration:

SN74HC574NSR uses a narrower 20-SO package (0.209", 5.30mm Width) compared to the standard 20-SOIC (0.295", 7.50mm Width). This part is suitable only for designs with compatible PCB footprints.

Compliance Status:

All recommended active substitutes maintain ROHS3 compliance and REACH unaffected status, matching the regulatory requirements of the original MM74HC574WM.

Frequently Asked Questions (FAQ)

Q: Can MC74HC574ADWG directly replace MM74HC574WM in existing designs?

A: Yes. MC74HC574ADWG maintains identical electrical specifications for voltage supply (2V ~ 6V), output configuration (tri-state, non-inverted), and core functionality (D-type flip-flop, 8-bit, positive edge trigger). The extended operating temperature range (-55°C ~ 125°C vs. -40°C ~ 85°C) and reduced quiescent current provide additional design margin. Both are ROHS3 compliant.

Q: What is the difference between MC74HC574ADWG and MC74HC574ADWR2G?

A: Both parts are electrically identical with matching specifications. The difference is packaging: MC74HC574ADWG is supplied in Tube packaging, while MC74HC574ADWR2G is supplied in Cut Tape (CT) & Digi-Reel® format. Selection depends on procurement and assembly requirements.

Q: Why does 74VHC574M have a lower maximum supply voltage (5.5V vs. 6V)?

A: The 74VHC series operates at a reduced voltage range (2V ~ 5.5V) compared to the 74HC series (2V ~ 6V). Designs operating at 6V supply voltage cannot use 74VHC574M without circuit modification. Verify circuit voltage requirements before substitution.

Q: Is SN74HC574NSR compatible with MM74HC574WM?

A: SN74HC574NSR is electrically compatible but uses a different package footprint. The 20-SO package (0.209", 5.30mm Width) differs from the standard 20-SOIC (0.295", 7.50mm Width). PCB footprint compatibility must be verified before use.

Q: What is the significance of the propagation delay differences between substitute parts?

A: Propagation delay determines the maximum speed at which the flip-flop can reliably capture and output data. The original MM74HC574WM specifies 27 ns @ 6V, 150pF. Substitutes with lower propagation delays (such as 74HC574D,653 at 26 ns) provide faster operation and are backward compatible. Substitutes with higher propagation delays (such as SN74HC574DW at 46 ns) may not meet timing-critical applications but are suitable for general-purpose logic functions.

Q: Are all substitute parts ROHS3 compliant?

A: Most active production substitutes are ROHS3 compliant. CD74HC574M (Harris Corporation, obsolete) is RoHS non-compliant. Verify compliance status for each selected part based on regulatory requirements of the target application.

Q: What does MSL (Moisture Sensitivity Level) indicate?

A: MSL defines the maximum time a component can be exposed to ambient conditions before soldering. MM74HC574WM has MSL 1 (Unlimited), meaning no moisture precautions are required. MC74HC574ADWG and MC74HC574ADWR2G have MSL 3 (168 Hours), requiring controlled storage and handling procedures. Select based on manufacturing process capabilities and storage infrastructure.

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