74ACQ377PC Equivalent & Substitute Parts

Part Overview

The 74ACQ377PC is an 8-bit D-type flip-flop logic integrated circuit manufactured by onsemi in a 20-DIP through-hole package. This component is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations. The 74ACQ series represents a legacy logic family, and equivalent substitutes from active product lines provide continued availability while maintaining functional compatibility.

Substiute Parts

74ACQ377PC

onsemiIn Stock: 105174ACQ377PC Datasheet

Current PartRFQ

SN74AC374DWR

Texas InstrumentsIn Stock: 2160SN74AC374DWR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 74ACQ377PC is determined by functional equivalence within the 74AC logic family. The primary substitute, SN74AC374DWR, maintains functional compatibility through the following key parameters:

• Function: D-Type flip-flop with 8-bit configuration
• Logic family: 74AC series (compatible with 74ACQ)
• Element count and bit configuration: 1 element, 8 bits per element
• Output type: Tri-State, Non-Inverted
• Trigger mechanism: Positive Edge
• Supply voltage range: 2V ~ 6V (encompasses standard 5V operation)
• Package pinout: 20-pin configuration (electrical equivalence maintained despite physical package difference)

The SN74AC374DWR represents an active product with current manufacturing status and improved compliance certifications, making it suitable for applications requiring the functional characteristics of the obsolete 74ACQ377PC.

Parameter Comparison

Engineering Selection Recommendations

The SN74AC374DWR is the designated substitute for the obsolete 74ACQ377PC based on the following engineering criteria:

• Product Status: The substitute is an active product with current manufacturing support, whereas the original part is obsolete and subject to availability constraints.
• Compliance: The SN74AC374DWR meets ROHS3 compliance requirements, providing regulatory advantage for new designs and systems requiring environmental compliance certification.
• Functional Equivalence: Both parts operate as 8-bit D-type flip-flops with positive edge triggering and tri-state output capability, maintaining electrical compatibility at the functional level.
• Supply Voltage Compatibility: The 2V ~ 6V supply range of the substitute encompasses standard 5V logic operation, ensuring compatibility with existing circuit designs.
• Regulatory Classification: Both parts share identical ECCN (EAR99) and HTSUS (8542.39.0001) classifications, maintaining consistent export and tariff treatment.

Package Consideration: The substitute uses a 20-SOIC surface-mount package instead of the through-hole 20-DIP package of the original part. This requires circuit board redesign and assembly process modification. For applications requiring through-hole mounting, alternative 74AC-series substitutes in DIP packaging should be evaluated based on specific functional requirements.

Frequently Asked Questions (FAQ)

Q: Can the SN74AC374DWR directly replace the 74ACQ377PC in existing circuit boards?

A: Electrical substitution is possible due to functional equivalence and compatible pin configurations. However, physical substitution requires board redesign because the SN74AC374DWR uses a 20-SOIC surface-mount package while the 74ACQ377PC uses a 20-DIP through-hole package. Pin-to-pin electrical compatibility exists, but mounting method differs.

Q: What are the key functional parameters that define substitution eligibility?

A: Substitution is determined by: 8-bit D-type flip-flop configuration, single element design, positive edge triggering, tri-state non-inverted output, and 2V ~ 6V supply voltage range. The SN74AC374DWR meets all these criteria.

Q: Does the RoHS compliance difference affect substitution suitability?

A: The SN74AC374DWR's ROHS3 compliance provides regulatory advantage for new designs and systems subject to environmental compliance requirements. The original 74ACQ377PC's RoHS non-compliance status is relevant only for legacy system maintenance where original specifications must be preserved.

Q: Are there other 74AC-series alternatives available?

A: The provided substitute list identifies the SN74AC374DWR as the primary equivalent. Additional 74AC-series D-type flip-flops may exist; however, substitution eligibility must be verified against the functional parameters listed in this document.

Q: What is the significance of the MSL rating for both parts?

A: Both parts carry MSL 1 (Unlimited) classification, indicating no moisture sensitivity constraints during storage, handling, or assembly. This parameter is equivalent between the original and substitute parts.