74ACT174PC Equivalent & Substitute Parts

Part Overview

The 74ACT174PC is a D-Type flip-flop integrated circuit manufactured by onsemi, designed for digital logic applications requiring 6-bit positive edge-triggered storage. This component features a master reset function and operates at clock frequencies up to 200 MHz with a maximum propagation delay of 10.5 ns at 5V with 50 pF load.

The 74ACT174PC is classified as obsolete. Finding equivalent and substitute parts is necessary to support legacy system maintenance, design updates, and procurement continuity when original stock becomes unavailable.

Substiute Parts

74ACT174PC

onsemiIn Stock: 191674ACT174PC Datasheet

Current PartRFQ

CD74ACT174E

Harris CorporationIn Stock: 2111CD74ACT174E Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 74ACT174PC is determined by the following critical parameters:

• Logic Family & Series: Both parts must belong to the 74ACT series to ensure electrical compatibility
• Functional Type: D-Type flip-flop with 6-bit configuration and positive edge trigger
• Package & Pinout: 16-DIP (0.300", 7.62mm) through-hole mounting for direct board-level replacement
• Voltage Supply: 4.5V ~ 5.5V operating range
• Output Configuration: Non-inverted output type with 24 mA source/sink capability
• Master Reset Function: Required for system reset control

The CD74ACT174E from Harris Corporation meets these core substitution criteria, maintaining functional equivalence and physical compatibility with the 74ACT174PC.

Parameter Comparison

Engineering Selection Recommendations

Both the 74ACT174PC and CD74ACT174E are classified as obsolete products. Selection between these parts should be based on the following factors:

74ACT174PC (onsemi): Select this part when the application requires maximum clock frequency performance (200 MHz) and operates within the standard temperature range (-40°C ~ 85°C). This part is suitable for time-critical digital logic circuits where propagation delay must not exceed 10.5 ns.

CD74ACT174E (Harris Corporation): Select this part when the application can tolerate lower clock frequency operation (80 MHz) and longer propagation delay (14 ns). This part offers advantages in applications requiring extended operating temperature range (-55°C ~ 125°C) or lower quiescent current consumption (8 µA versus 40 µA). Note that CD74ACT174E carries RoHS non-compliant status, which may impact suitability for regulated industries or new design implementations.

Both parts maintain identical pinout, package configuration, and core functional characteristics, enabling direct board-level substitution when electrical performance parameters are acceptable for the target application.

Frequently Asked Questions (FAQ)

Q: Can the CD74ACT174E directly replace the 74ACT174PC on a PCB?

A: Yes, both parts use identical 16-DIP (0.300", 7.62mm) through-hole packaging with matching pinout. Direct physical substitution is possible. However, verify that the application's timing requirements can tolerate the CD74ACT174E's longer propagation delay (14 ns versus 10.5 ns) and lower maximum clock frequency (80 MHz versus 200 MHz).

Q: What are the key differences between these two parts?

A: The primary differences are clock frequency rating (200 MHz vs. 80 MHz), maximum propagation delay (10.5 ns vs. 14 ns), quiescent current (40 µA vs. 8 µA), input capacitance (4.5 pF vs. 10 pF), and operating temperature range (-40°C ~ 85°C vs. -55°C ~ 125°C). The 74ACT174PC offers higher performance; the CD74ACT174E offers lower power consumption and extended temperature operation.

Q: Are there any compliance or regulatory differences?

A: The CD74ACT174E is marked as RoHS non-compliant, while the 74ACT174PC has REACH Unaffected status. Both carry ECCN EAR99 classification. For applications subject to RoHS requirements, the 74ACT174PC may be the more suitable choice.

Q: What should I verify before substituting these parts?

A: Verify that your circuit's timing margins can accommodate the CD74ACT174E's longer propagation delay and lower clock frequency rating. Confirm that the operating temperature range of the substitute part covers your application's requirements. Review any compliance or regulatory requirements that may be affected by RoHS status differences.

Q: Can these parts be used interchangeably in all applications?

A: Interchangeability depends on application-specific timing and environmental requirements. Both parts are functionally equivalent in terms of logic operation and pinout. However, applications with strict timing constraints or extended temperature operation requirements may not tolerate substitution without circuit analysis and validation.