MM74HC574N Equivalent & Substitute Parts

Part Overview

The MM74HC574N is a D-Type flip-flop logic integrated circuit manufactured by onsemi, featuring 1 element with 8-bit positive edge triggering in a 20-DIP package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing production and maintenance applications. The part operates across a 2V to 6V supply range with tri-state, non-inverted outputs suitable for digital logic applications requiring edge-triggered data storage and output control.

Substiute Parts

MM74HC574N

onsemiIn Stock: 8070MM74HC574N Datasheet

Current PartRFQ

SN74HC574N

Texas InstrumentsIn Stock: 13743SN74HC574N Datasheet

DirectRFQ

CD74HC534E

Texas InstrumentsIn Stock: 1242CD74HC534E Datasheet

SimilarRFQ

CD74HC574E

Harris CorporationIn Stock: 1460CD74HC574E Datasheet

SimilarRFQ

TC74HC574APF

Toshiba Semiconductor and StorageIn Stock: 2826TC74HC574APF Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the MM74HC574N is determined by the following critical parameters:

Mandatory Matching Parameters:

• Type: D-Type flip-flop
• Number of Elements: 1
• Number of Bits per Element: 8
• Trigger Type: Positive Edge
• Package / Case: 20-DIP (0.300", 7.62mm)
• Mounting Type: Through Hole
• Voltage Supply Range: 2V ~ 6V (minimum overlap required)
• Output Type: Tri-State configuration

Allowable Variation Parameters:

• Clock Frequency: May exceed 35 MHz
• Max Propagation Delay: May be lower (faster) than 27 ns
• Current ratings: May be equal or lower
• Quiescent Current: May be lower than 8 µA
• Input Capacitance: May vary
• Operating Temperature: May extend beyond -40°C ~ 85°C
• Product Status: Active status preferred for new designs

Non-Substitutable Variants:

• CD74HC534E: Output type is Tri-State, Inverted (incompatible with non-inverted requirement)

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: SN74HC574N (Texas Instruments)

The SN74HC574N is the recommended direct substitute for the MM74HC574N. Both parts share identical functional specifications, package configuration, and electrical characteristics. The SN74HC574N maintains active product status, ensuring long-term availability and supply chain stability. This part is ROHS3 compliant, meeting modern regulatory requirements. The marginally higher propagation delay (46 ns versus 27 ns at 6V, 150pF) remains within acceptable parameters for most 74HC logic applications.

Secondary Substitute: TC74HC574APF (Toshiba Semiconductor)

The TC74HC574APF provides an alternative from an active manufacturer with superior quiescent current performance (4 µA versus 8 µA). This part is ROHS3 compliant and maintains identical package and functional specifications. The propagation delay of 33 ns at 6V, 150pF is intermediate between the original and the Texas Instruments variant, suitable for timing-critical applications.

Tertiary Substitute: CD74HC574E (Harris Corporation)

The CD74HC574E is functionally compatible but carries obsolete product status, limiting its suitability for new designs. This part exhibits faster propagation delay (28 ns at 6V, 50pF) but is not RoHS compliant. Use only when existing inventory must be consumed or for legacy system maintenance.

Non-Substitutable: CD74HC534E

The CD74HC534E is not a valid substitute due to inverted output configuration (Tri-State, Inverted versus Tri-State, Non-Inverted). Logic inversion would require circuit redesign and is not a direct replacement.

Frequently Asked Questions (FAQ)

Q: Can the SN74HC574N directly replace the MM74HC574N without circuit modification?

A: Yes. The SN74HC574N is a direct functional equivalent with identical pin configuration, package type (20-DIP), and electrical operating parameters. No circuit modification is required.

Q: What is the significance of the propagation delay difference between MM74HC574N (27 ns) and SN74HC574N (46 ns)?

A: The propagation delay difference reflects measurement conditions. The MM74HC574N is specified at 150pF load capacitance, while the SN74HC574N is also specified at 150pF. Both values are within the 74HC logic family specification range and are suitable for standard digital logic applications operating at frequencies up to 36 MHz.

Q: Is the TC74HC574APF suitable for low-power applications?

A: The TC74HC574APF offers reduced quiescent current (4 µA versus 8 µA), making it preferable for battery-powered or low-power standby applications. All other electrical characteristics remain equivalent to the original part.

Q: Why is CD74HC534E listed as non-substitutable?

A: The CD74HC534E has inverted outputs (Tri-State, Inverted) while the MM74HC574N has non-inverted outputs (Tri-State, Non-Inverted). Output inversion changes logic levels and would require circuit redesign. This is not a pin-compatible substitute.

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

A: Yes. All substitute parts are available in 20-DIP (0.300", 7.62mm) through-hole packages, ensuring mechanical and electrical compatibility with existing PCB designs.

Q: What compliance certifications should I prioritize when selecting a substitute?

A: For new designs, prioritize ROHS3 compliance. The SN74HC574N and TC74HC574APF both meet ROHS3 requirements. All listed parts maintain REACH Unaffected status. The CD74HC574E is RoHS non-compliant and should be avoided for new applications.

Q: Can I use these parts interchangeably in production?

A: The SN74HC574N and TC74HC574APF are interchangeable from a functional and electrical standpoint. If production requires consistent quiescent current specifications, standardize on one manufacturer. The CD74HC574E should not be used in new production due to obsolete status and non-compliance certifications.