74ACQ374PC Equivalent & Substitute Parts

Part Overview

The 74ACQ374PC is a single-element D-type flip-flop logic integrated circuit with 8-bit positive edge triggering, housed in a 20-DIP package. This component functions as a standard data storage and transfer device in digital logic applications. The 74ACQ374PC is classified as obsolete, making equivalent substitute parts necessary for ongoing system maintenance, repairs, and legacy design support.

Substiute Parts

74ACQ374PC

onsemiIn Stock: 106574ACQ374PC Datasheet

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CD74AC374E

Harris CorporationIn Stock: 6299CD74AC374E Datasheet

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SN74AC374N

Texas InstrumentsIn Stock: 1986SN74AC374N Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 74ACQ374PC are qualified based on the following electrical and mechanical parameters:

Critical Compatibility Parameters:

• 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
• Package / Case: 20-DIP (0.300", 7.62mm)
• Mounting Type: Through Hole

Allowable Variation Parameters:

• Clock Frequency: Equal to or greater than 90 MHz
• Max Propagation Delay: Equal to or less than 8.5ns @ 5V, 50pF
• Voltage - Supply: Must encompass or overlap with 2V ~ 6V range
• Operating Temperature: Must encompass or overlap with -40°C ~ 85°C range
• Current - Output High, Low: 24mA, 24mA (fixed requirement)

The substitute parts CD74AC374E and SN74AC374N meet these criteria while offering improved or equivalent performance characteristics.

Parameter Comparison

Engineering Selection Recommendations

SN74AC374N (Texas Instruments) is the primary substitute for new designs and ongoing production. This part is actively manufactured, ROHS3 compliant, and maintains identical supply voltage and operating temperature ranges as the original 74ACQ374PC. The SN74AC374N offers superior propagation delay performance (9.5ns) and significantly lower quiescent current (4 µA), making it functionally superior while maintaining full pin and package compatibility.

CD74AC374E (Harris Corporation) serves as an alternative substitute where supply availability of the SN74AC374N is constrained. This part meets all electrical and mechanical compatibility requirements. However, the CD74AC374E is classified as obsolete and exhibits higher propagation delay (10.8ns) and quiescent current (8 µA) compared to the SN74AC374N. The CD74AC374E operates across an extended temperature range (-55°C ~ 125°C) and lower minimum supply voltage (1.5V), which may be advantageous in specific applications. The CD74AC374E is RoHS non-compliant.

Both substitute parts maintain the 20-DIP through-hole package format, ensuring direct mechanical and electrical compatibility with existing PCB layouts designed for the 74ACQ374PC.

Frequently Asked Questions (FAQ)

Q: Can the SN74AC374N directly replace the 74ACQ374PC without PCB modifications?

A: Yes. The SN74AC374N is a direct pin-for-pin replacement. Both parts use the 20-DIP (0.300", 7.62mm) through-hole package with identical pinout. No PCB layout changes are required.

Q: What are the key differences between the CD74AC374E and SN74AC374N substitutes?

A: Both parts are functionally equivalent and pin-compatible. The SN74AC374N is actively manufactured and ROHS3 compliant, while the CD74AC374E is obsolete and RoHS non-compliant. The SN74AC374N offers lower quiescent current (4 µA vs. 8 µA) and faster propagation delay (9.5ns vs. 10.8ns). The CD74AC374E provides extended temperature range (-55°C ~ 125°C vs. -40°C ~ 85°C) and lower minimum supply voltage (1.5V vs. 2V).

Q: Are there supply voltage compatibility concerns when substituting these parts?

A: The SN74AC374N operates within 2V ~ 6V, matching the original 74ACQ374PC specification. The CD74AC374E operates within 1.5V ~ 5.5V, which overlaps the original range but has a lower maximum voltage. Both substitutes are compatible with standard 5V logic systems.

Q: Which substitute should be selected for new production designs?

A: The SN74AC374N is the recommended choice for new production. It is actively manufactured, ROHS3 compliant, and offers superior electrical performance with lower power consumption and faster propagation delay.

Q: Can the CD74AC374E be used in applications requiring extended temperature operation?

A: Yes. The CD74AC374E supports -55°C ~ 125°C operation, exceeding the original 74ACQ374PC range of -40°C ~ 85°C. This makes the CD74AC374E suitable for applications requiring extended temperature performance, provided RoHS non-compliance is acceptable.