74AC174PC Equivalent & Substitute Parts

Part Overview

The 74AC174PC is a D-Type flip-flop integrated circuit manufactured by onsemi, designed for digital logic applications requiring synchronous data storage and transfer. This device features 6-bit parallel data input with positive edge triggering and master reset functionality. The part is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system maintenance, legacy design support, and component procurement planning.

Substiute Parts

74AC174PC

onsemiIn Stock: 75774AC174PC Datasheet

Current PartRFQ

CD74AC174E

Harris CorporationIn Stock: 33440CD74AC174E Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 74AC174PC is determined by strict adherence to the following core parameters:

• Logic Family & Series: Must belong to 74AC series to ensure voltage and timing compatibility
• Functional Architecture: Must be a D-Type flip-flop with 1 element and 6-bit configuration
• Trigger Mechanism: Must support positive edge triggering
• Output Configuration: Must provide non-inverted outputs
• Control Function: Must include master reset capability
• Package Compatibility: Must use 16-DIP (0.300", 7.62mm) through-hole package
• Electrical Compatibility: Supply voltage range and output drive capability must support the application circuit

The CD74AC174E qualifies as a direct substitute based on these criteria, sharing identical functional specifications and package form factor.

Parameter Comparison

Engineering Selection Recommendations

Both the 74AC174PC and CD74AC174E are classified as obsolete products. Selection between these parts should be based on application-specific requirements and compliance constraints:

74AC174PC (onsemi): Offers higher clock frequency (125 MHz) and faster propagation delay (8.5 ns), making it suitable for timing-critical applications. Supply voltage range of 2V to 6V provides broader operational flexibility. Moisture Sensitivity Level (MSL) rating of 1 indicates unlimited shelf life without moisture control requirements. REACH Unaffected status confirms compliance with EU chemical regulations.

CD74AC174E (Harris Corporation): Provides extended operating temperature range (-55°C to 125°C) compared to the onsemi variant, supporting applications requiring operation in extreme thermal environments. Lower quiescent current (8 µA versus 40 µA) reduces power consumption in standby conditions. Extended supply voltage tolerance (1.5V to 5.5V) accommodates lower voltage system designs. Note: RoHS non-compliant status may restrict use in applications with RoHS compliance mandates.

Both parts share identical functional architecture, package form factor, and output drive specifications, ensuring direct pin-for-pin compatibility in 16-DIP through-hole applications.

Frequently Asked Questions (FAQ)

Q: Can the CD74AC174E directly replace the 74AC174PC in existing designs?

A: Yes, both parts are functionally equivalent D-Type flip-flops with 6-bit configuration, positive edge triggering, and 16-DIP package compatibility. Pin-for-pin substitution is valid. However, verify that the application circuit operates within the CD74AC174E supply voltage range (1.5V to 5.5V) and operating temperature range (-55°C to 125°C).

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

A: The primary differences are clock frequency (125 MHz versus 95 MHz), propagation delay (8.5 ns versus 18.9 ns), quiescent current (40 µA versus 8 µA), and operating temperature range (-40°C to 85°C versus -55°C to 125°C). The 74AC174PC offers superior speed performance, while the CD74AC174E provides lower power consumption and extended temperature operation.

Q: Are there any compliance or regulatory differences?

A: The 74AC174PC is REACH Unaffected and carries MSL-1 rating. The CD74AC174E is RoHS non-compliant, which may impact procurement for applications requiring RoHS certification. Both parts carry identical ECCN (EAR99) and HTSUS (8542.39.0001) classifications.

Q: Does package compatibility guarantee functional interchangeability?

A: Package compatibility (16-DIP form factor) is necessary but not sufficient for substitution. Functional interchangeability requires matching logic family (74AC series), flip-flop type (D-Type), bit configuration (6-bit), trigger mechanism (positive edge), output type (non-inverted), and control function (master reset). Both listed parts meet all these criteria.

Q: What should be verified before implementing a substitute part?

A: Confirm that the application circuit operates within the substitute part's electrical specifications: supply voltage range, operating temperature range, maximum clock frequency, and output load capacitance. Both parts support identical output drive current (24 mA), ensuring compatibility with standard logic loads.