74ACT174SC Equivalent & Substitute Parts

Part Overview

The 74ACT174SC is a D-Type flip-flop logic integrated circuit manufactured by onsemi, featuring 1 element with 6 bits per element in a 16-SOIC surface mount package. This component functions as a master reset flip-flop with positive edge triggering and non-inverted outputs. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing system maintenance, repairs, and legacy design support.

Substiute Parts

74ACT174SC

onsemiIn Stock: 1567174ACT174SC Datasheet

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CD74ACT174M

Harris CorporationIn Stock: 1384CD74ACT174M Datasheet

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CD74ACT174M96

Harris CorporationIn Stock: 4337CD74ACT174M96 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 74ACT174SC are identified based on strict electrical and mechanical compatibility criteria. The following parameters must match or be compatible for substitution:

• Functional equivalence: D-Type flip-flop with 1 element, 6 bits per element, positive edge trigger, non-inverted output, master reset function
• Package compatibility: 16-SOIC (0.154", 3.90mm Width) surface mount package
• Electrical parameters: Supply voltage range 4.5V ~ 5.5V, output current capability 24mA high/low
• Series alignment: 74ACT logic family

The identified substitute parts CD74ACT174M and CD74ACT174M96, both manufactured by Harris Corporation, meet these core substitution criteria. Both parts maintain the same functional architecture, package form factor, and electrical operating parameters within acceptable tolerances.

Parameter Comparison

Engineering Selection Recommendations

Both CD74ACT174M and CD74ACT174M96 are functionally equivalent substitutes for the 74ACT174SC. Selection between these options depends on specific application requirements and compliance constraints:

CD74ACT174M is supplied in tube packaging and carries RoHS non-compliant status. This part is suitable for applications where RoHS compliance is not mandated and standard packaging is acceptable.

CD74ACT174M96 is supplied in bulk packaging and also carries RoHS non-compliant status. This variant may be preferred for high-volume applications or where bulk packaging aligns with procurement workflows.

Both substitute parts operate within the same supply voltage range (4.5V ~ 5.5V) and maintain identical output current specifications (24mA). The Harris Corporation parts feature extended operating temperature range (-55°C ~ 125°C) compared to the original onsemi part (-40°C ~ 85°C), providing broader thermal compatibility. Clock frequency and propagation delay specifications differ slightly; the Harris parts operate at 80 MHz with 14ns maximum propagation delay versus the onsemi part at 200 MHz with 10.5ns delay. These differences are acceptable for most legacy system applications where the original 74ACT174SC is being replaced.

Frequently Asked Questions (FAQ)

Q: Can CD74ACT174M and CD74ACT174M96 be used interchangeably with 74ACT174SC?

A: Yes, both Harris Corporation parts are functionally equivalent substitutes. The primary difference between them is packaging format (tube versus bulk). Electrical performance and pin configuration are identical.

Q: What is the impact of the lower clock frequency (80 MHz) in the substitute parts?

A: The substitute parts operate at 80 MHz compared to the original 200 MHz specification. This is acceptable for applications where the system clock does not exceed 80 MHz. If your application requires operation above 80 MHz, the substitute parts are not suitable.

Q: Are there temperature range considerations when substituting?

A: The substitute parts feature an extended operating temperature range (-55°C ~ 125°C) compared to the original part (-40°C ~ 85°C). This provides additional thermal margin and is beneficial for applications operating at temperature extremes.

Q: What does RoHS non-compliant status mean for these substitute parts?

A: RoHS non-compliant status indicates these parts do not meet Restriction of Hazardous Substances directives. If your application or region requires RoHS compliance, these substitutes are not suitable. Verify compliance requirements before selection.

Q: Is the 16-SOIC package identical across all three parts?

A: Yes, all three parts use the 16-SOIC (0.154", 3.90mm Width) surface mount package. Pin configuration and PCB footprint are identical, allowing direct board-level substitution without layout modifications.

Q: What is the significance of quiescent current differences (40 µA versus 8 µA)?

A: The substitute parts consume significantly less quiescent current (8 µA) compared to the original part (40 µA). This represents improved power efficiency and is advantageous for battery-powered or low-power applications.