74AC377SC Equivalent & Substitute Parts

Part Overview

The 74AC377SC is a D-Type flip-flop logic integrated circuit manufactured by onsemi, designed for 8-bit parallel data storage and synchronization applications. This component features a single D-Type element with 8-bit capacity, positive edge triggering, and operates across a 2V to 6V supply voltage range. The part is currently classified as obsolete, making equivalent substitute parts necessary for ongoing system maintenance, repairs, and legacy design support.

Substiute Parts

74AC377SC

onsemiIn Stock: 94274AC377SC Datasheet

Current PartRFQ

MC74AC377DWR2G

onsemiIn Stock: 1739MC74AC377DWR2G Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 74AC377SC are identified based on strict electrical and mechanical compatibility criteria. The following parameters must match or remain within acceptable operational ranges:

• Package Type: Must be 20-SOIC (0.295", 7.50mm Width) for mechanical compatibility
• Logic Function: Must be D-Type flip-flop with 8-bit capacity and single element configuration
• Trigger Mechanism: Must support positive edge triggering
• Output Configuration: Must provide non-inverted outputs
• Supply Voltage Range: Must support 2V ~ 6V operation
• Operating Temperature Range: Must cover -40°C ~ 85°C minimum
• Mounting Type: Must be surface mount compatible

The MC74AC377DWR2G meets all these criteria and is classified as an active product, making it a direct functional equivalent suitable for replacement applications.

Parameter Comparison

Engineering Selection Recommendations

The MC74AC377DWR2G is the recommended substitute for the obsolete 74AC377SC based on the following engineering criteria:

Product Status: The MC74AC377DWR2G maintains active product status with current manufacturing support, ensuring long-term availability and supply chain reliability compared to the obsolete 74AC377SC.

Compliance and Certifications: The MC74AC377DWR2G is RoHS3 compliant and maintains REACH unaffected status, meeting modern regulatory requirements for electronic component procurement and deployment.

Electrical Compatibility: Both parts operate within identical supply voltage ranges (2V ~ 6V) and temperature specifications (-40°C ~ 85°C). The MC74AC377DWR2G exhibits lower quiescent current (8 µA versus 40 µA), providing improved power efficiency in battery-powered or low-power applications.

Packaging and Mechanical Compatibility: Both components utilize the 20-SOIC package format with identical physical dimensions, enabling direct board-level substitution without PCB redesign.

Performance Characteristics: The MC74AC377DWR2G operates at 140 MHz clock frequency with 10 ns maximum propagation delay, compared to the 74AC377SC at 175 MHz with 9 ns delay. These performance differences remain within acceptable operational margins for most digital logic applications.

Frequently Asked Questions (FAQ)

Q: Can the MC74AC377DWR2G be used as a direct replacement for the 74AC377SC?

A: Yes. Both components share identical package types (20-SOIC), logic function (8-bit D-Type flip-flop), trigger mechanism (positive edge), and supply voltage specifications (2V ~ 6V). Direct substitution is mechanically and electrically compatible.

Q: What are the key differences between these parts?

A: The primary differences are product status (MC74AC377DWR2G is active; 74AC377SC is obsolete), quiescent current (8 µA versus 40 µA), clock frequency (140 MHz versus 175 MHz), and propagation delay (10 ns versus 9 ns). The MC74AC377DWR2G also includes RoHS3 compliance certification.

Q: Does the lower clock frequency of the MC74AC377DWR2G affect system performance?

A: The MC74AC377DWR2G operates at 140 MHz, which is suitable for most digital logic applications. Applications requiring operation above 140 MHz should verify timing requirements against the 10 ns propagation delay specification.

Q: Are there packaging differences between these parts?

A: No. Both parts use the 20-SOIC (0.295", 7.50mm Width) surface mount package. The 74AC377SC ships in standard packaging, while the MC74AC377DWR2G is available in Tape & Reel format for automated assembly processes.

Q: What is the significance of the RoHS3 compliance on the MC74AC377DWR2G?

A: RoHS3 compliance indicates the MC74AC377DWR2G meets current European Union Restriction of Hazardous Substances regulations, making it suitable for procurement in regulated markets and applications requiring compliance documentation.

Q: Can the MC74AC377DWR2G be used in legacy systems designed for the 74AC377SC?

A: Yes. The electrical and mechanical compatibility of the MC74AC377DWR2G with the 74AC377SC makes it suitable for legacy system repairs and maintenance applications without circuit modification.