MM74HC574SJ Equivalent & Substitute Parts

Part Overview

The MM74HC574SJ is a D-type flip-flop logic integrated circuit manufactured by onsemi, featuring 1 element with 8-bit positive edge triggering capability. This component is classified as obsolete, which necessitates identification of functionally equivalent alternatives for ongoing design support and procurement.

The MM74HC574SJ operates within the 74HC logic family standard, providing tri-state, non-inverted outputs suitable for digital logic applications requiring edge-triggered data storage and transfer operations.

Key Parameters

Parameter	Value
Manufacturer Part Number	MM74HC574SJ
Manufacturer	onsemi
Base Product Number	74HC574
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
Voltage Supply Range	2V to 6V
Operating Temperature Range	-40°C to 85°C
Package Type	20-SOIC (0.209", 5.30mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the MM74HC574SJ is determined by the following mandatory parameters:

Base product number: 74HC574
Function: Standard D-type flip-flop
Type: D-Type with 1 element, 8-bit configuration
Output type: Tri-State, Non-Inverted
Trigger type: Positive Edge
Voltage supply range: 2V to 6V (minimum overlap required)
Mounting type: Surface Mount
Package family: 20-SOIC

Substitute parts must maintain compatibility across these core electrical and mechanical specifications. Variations in clock frequency, propagation delay, quiescent current, and operating temperature ranges are permitted within the 74HC574 family standard, provided the part functions as a standard D-type flip-flop with identical pin configuration and output characteristics.

Parameter Comparison

Parameter	MM74HC574SJ (onsemi)	74HC574D (Toshiba)	CD74HC574M (Harris)	CD74HC574M96 (TI)	SN74HC574DW (TI)	SN74HC574DWR (TI)	SN74HC574NSR (TI)
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
Number of Bits per Element	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
Trigger Type	Positive Edge	Positive Edge	Positive Edge	Positive Edge	Positive Edge	Positive Edge	Positive Edge
Voltage Supply Range	2V to 6V	2V to 6V	2V to 6V	2V to 6V	2V to 6V	2V to 6V	2V to 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
Clock Frequency	35 MHz	59 MHz	60 MHz	60 MHz	36 MHz	36 MHz	40 MHz
Max Propagation Delay @ 6V, 150pF	27ns	33ns	28ns @ 50pF	28ns @ 50pF	46ns	46ns	31ns @ 50pF
Current - Quiescent (Iq)	8 µA	4 µA	8 µA	8 µA	8 µA	8 µA	8 µA
Operating Temperature Range	-40°C to 85°C	-40°C to 85°C	-55°C to 125°C	-55°C to 125°C	-40°C to 85°C	-40°C to 85°C	-40°C to 85°C
Package / Case	20-SOIC (0.209", 5.30mm Width)	20-SOIC (0.295", 7.50mm Width)	20-SOIC (0.295", 7.50mm Width)	20-SOIC (0.295", 7.50mm Width)	20-SOIC (0.295", 7.50mm Width)	20-SOIC (0.295", 7.50mm Width)	20-SOIC (0.209", 5.30mm Width)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Active	Obsolete	Active	Discontinued at DiGi Electronics	Active	Active
RoHS Status	REACH Unaffected	ROHS3 Compliant	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For applications currently utilizing the MM74HC574SJ, the following active-status alternatives are recommended based on product availability and compliance status:

Primary Recommendation: SN74HC574DWR (Texas Instruments)

The SN74HC574DWR maintains active product status with ROHS3 compliance and REACH unaffected certification. This part is available in Cut Tape and Digi-Reel packaging with 3,765 units in stock. The 20-SOIC package width of 0.295" (7.50mm) differs from the original MM74HC574SJ specification of 0.209" (5.30mm), requiring PCB layout verification for pin-to-pin compatibility.

Secondary Recommendation: CD74HC574M96 (Texas Instruments)

The CD74HC574M96 offers active product status with ROHS3 compliance and extended operating temperature range (-55°C to 125°C). This part is supplied in Tape & Reel packaging with 1,850 units in stock. Package width matches the secondary substitute group at 0.295" (7.50mm).

Alternative for Narrow Package Requirement: SN74HC574NSR (Texas Instruments)

The SN74HC574NSR maintains the original 0.209" (5.30mm) package width of the MM74HC574SJ while offering active product status, ROHS3 compliance, and 2,300 units in stock. This part is supplied in Cut Tape and Digi-Reel packaging.

Obsolete Status Parts (Not Recommended for New Designs):

The 74HC574D (Toshiba) and CD74HC574M (Harris) retain obsolete or non-compliant status and should not be selected for new production designs despite functional equivalence.

Frequently Asked Questions (FAQ)

Q: Can the MM74HC574SJ be directly replaced with any of the listed substitutes?

A: All listed substitutes share the core 74HC574 base product number and maintain identical functional specifications as D-type flip-flops with 1 element, 8-bit configuration, tri-state non-inverted outputs, and positive edge triggering. However, package width variations exist between substitute groups. The MM74HC574SJ uses a 0.209" (5.30mm) width package, while most substitutes use 0.295" (7.50mm) width. The SN74HC574NSR maintains the original narrow package width. PCB layout verification is required before substitution.

Q: What is the significance of the package width difference?

A: The 20-SOIC package family maintains identical pin count and pitch spacing. The width difference (0.209" versus 0.295") affects the physical footprint on the PCB. Designs with tight spacing constraints may require the narrower 0.209" package (MM74HC574SJ or SN74HC574NSR), while standard layouts accommodate the wider 0.295" package. Pin-to-pin electrical compatibility remains unchanged.

Q: Are there compliance or regulatory differences between substitutes?

A: Yes. The SN74HC574DWR, CD74HC574M96, and SN74HC574NSR are ROHS3 compliant with REACH unaffected status, suitable for regulated markets. The CD74HC574M (Harris) is RoHS non-compliant and should not be used in applications requiring RoHS certification. The 74HC574D (Toshiba) is ROHS3 compliant but carries obsolete status.

Q: How do clock frequency and propagation delay variations affect substitution?

A: The MM74HC574SJ operates at 35 MHz with 27ns maximum propagation delay at 6V and 150pF load. Substitute parts range from 36 MHz to 60 MHz with propagation delays from 28ns to 46ns. These variations remain within the 74HC574 family specification and do not affect functional compatibility. Applications with timing-critical requirements should verify that substitute propagation delay specifications meet circuit timing margins.

Q: What is the difference between the various Texas Instruments part numbers?

A: SN74HC574DW is discontinued at DiGi Electronics, SN74HC574DWR is active with Cut Tape and Digi-Reel packaging, and SN74HC574NSR is active with the original narrow package width. CD74HC574M96 is also active with extended temperature range. All three active TI parts maintain identical electrical specifications and ROHS3 compliance.

Q: Can the MM74HC574SJ be used in new product designs?

A: No. The MM74HC574SJ carries obsolete status. New designs should select from active-status alternatives: SN74HC574DWR, CD74HC574M96, or SN74HC574NSR, all manufactured by Texas Instruments with active product status and current availability.

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