MM74HCT374N Equivalent & Substitute Parts

Part Overview

The MM74HCT374N 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 through-hole package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

The 74HCT374 series represents a standard logic function across multiple manufacturers. Substitute parts maintain functional compatibility through identical or superior electrical and mechanical specifications within the 74HCT logic family.

Substiute Parts

MM74HCT374N

onsemiIn Stock: 2977MM74HCT374N Datasheet

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CD74HCT374E

Texas InstrumentsIn Stock: 6295CD74HCT374E Datasheet

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CD74HCT377E

Harris CorporationIn Stock: 15902CD74HCT377E Datasheet

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SN74HCT374N

Texas InstrumentsIn Stock: 4456SN74HCT374N Datasheet

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SN74HCT377N

Texas InstrumentsIn Stock: 3066SN74HCT377N Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following criteria:

Primary Compatibility Requirements:

• Identical base product number (74HCT374 or 74HCT377)
• D-Type flip-flop function with 8-bit configuration
• Positive edge trigger type
• 20-DIP through-hole package (0.300", 7.62mm)
• Voltage supply range 4.5V ~ 5.5V
• Quiescent current 8 µA

Acceptable Parameter Variations:

• Clock frequency equal to or greater than the main part
• Propagation delay equal to or less than the main part
• Output current capacity equal to or greater than the main part
• Operating temperature range equal to or greater than the main part

Functional Grouping:

• 74HCT374 Group: CD74HCT374E, SN74HCT374N (Tri-State, Non-Inverted output)
• 74HCT377 Group: CD74HCT377E, SN74HCT377N (Non-Inverted output, different base number)

Parameter Comparison

Engineering Selection Recommendations

Direct Substitutes (74HCT374 Base Number):

CD74HCT374E and SN74HCT374N are direct functional equivalents to MM74HCT374N. Both maintain the tri-state, non-inverted output configuration and identical pin assignment. CD74HCT374E offers superior performance with 60 MHz clock frequency and 33ns propagation delay, with extended operating temperature range (-55°C ~ 125°C) and ROHS3 compliance. SN74HCT374N provides 40 MHz clock frequency and 41ns propagation delay with ROHS3 compliance, matching the original operating temperature range.

Alternative Substitutes (74HCT377 Base Number):

CD74HCT377E and SN74HCT377N are functional alternatives with non-inverted output but different base product number (74HCT377). These parts are compatible in applications where tri-state output is not required. CD74HCT377E is obsolete but offers extended temperature range and 50 MHz clock frequency. SN74HCT377N is active with ROHS3 compliance, 37 MHz clock frequency, and superior 28ns propagation delay.

Compliance Considerations:

For new designs requiring RoHS compliance, CD74HCT374E and SN74HCT374N (both ROHS3 compliant) are preferred. CD74HCT377E does not meet RoHS requirements and should be avoided in regulated applications.

Availability and Status:

SN74HCT374N and SN74HCT377N are active products from Texas Instruments, ensuring long-term availability. CD74HCT374E provides the highest performance specifications. CD74HCT377E and MM74HCT374N are obsolete and should be replaced in new designs.

Frequently Asked Questions (FAQ)

Q: Can SN74HCT374N directly replace MM74HCT374N?

A: Yes. SN74HCT374N is a direct functional equivalent with identical pin configuration, output type (tri-state, non-inverted), and package (20-DIP). It meets or exceeds all electrical specifications of MM74HCT374N.

Q: What is the difference between 74HCT374 and 74HCT377?

A: Both are 8-bit D-Type flip-flops in identical packages. The primary difference is output configuration: 74HCT374 features tri-state outputs, while 74HCT377 features non-inverted outputs without tri-state capability. Selection depends on application requirements for output control.

Q: Is CD74HCT374E compatible with MM74HCT374N?

A: Yes. CD74HCT374E is functionally compatible with superior electrical performance (60 MHz vs. 30 MHz clock frequency, 33ns vs. 46ns propagation delay) and extended operating temperature range (-55°C ~ 125°C vs. -40°C ~ 85°C).

Q: Which substitute offers the best performance?

A: CD74HCT374E provides the highest clock frequency (60 MHz) and fastest propagation delay (33ns @ 4.5V, 50pF). SN74HCT377N offers the fastest propagation delay overall (28ns @ 5.5V, 50pF) but uses the 74HCT377 base number.

Q: Are all substitutes RoHS compliant?

A: No. CD74HCT374E and SN74HCT374N are ROHS3 compliant. CD74HCT377E is RoHS non-compliant. SN74HCT377N is ROHS3 compliant. Verify compliance requirements for your application.

Q: Can I use these parts interchangeably in existing designs?

A: Direct substitutes (CD74HCT374E, SN74HCT374N) are pin-compatible and functionally equivalent. Alternative substitutes (CD74HCT377E, SN74HCT377N) require circuit verification to confirm tri-state output is not required.

Q: What is the package compatibility?

A: All listed parts use 20-DIP (0.300", 7.62mm) through-hole packaging with identical pin assignments within their respective base product families (74HCT374 or 74HCT377).