74ACT377SCX Equivalent & Substitute Parts

Part Overview

The 74ACT377SCX is a D-type flip-flop logic integrated circuit manufactured by onsemi, designed for 8-bit parallel data storage and synchronization applications. This device features a single element with 8 bits per element, operating at a maximum clock frequency of 175 MHz with a propagation delay of 10ns at 5V with 50pF load. The 74ACT377SCX is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements.

Substiute Parts

74ACT377SCX

onsemiIn Stock: 93674ACT377SCX Datasheet

Current PartRFQ

MC74ACT377DWR2G

onsemiIn Stock: 2424MC74ACT377DWR2G Datasheet

DirectRFQ

MC74ACT377DWG

onsemiIn Stock: 794MC74ACT377DWG Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 74ACT377SCX are identified based on strict electrical and mechanical compatibility criteria. The following parameters determine valid substitution:

Critical Compatibility Parameters:

• Functional type: D-Type flip-flop with 8-bit configuration
• Package: 20-SOIC (0.295", 7.50mm Width)
• Trigger mechanism: Positive edge
• Output configuration: Non-inverted
• Supply voltage range: 4.5V ~ 5.5V
• Operating temperature range: -40°C ~ 85°C
• Output drive capability: 24mA high and low

Acceptable Parameter Variations:

• Clock frequency: Substitute parts may operate at lower maximum frequencies (140 MHz) while maintaining functional compatibility
• Quiescent current: Substitute parts may have lower Iq specifications (8 µA vs. 40 µA)
• Propagation delay: Must not exceed the specified 10ns @ 5V, 50pF
• Moisture sensitivity level: May differ based on manufacturing process

The substitute parts MC74ACT377DWR2G and MC74ACT377DWG maintain all critical electrical and mechanical parameters required for direct substitution in applications designed for the 74ACT377SCX.

Parameter Comparison

Engineering Selection Recommendations

MC74ACT377DWR2G (Primary Recommendation)

The MC74ACT377DWR2G is the preferred substitute for the 74ACT377SCX. This part maintains active product status with onsemi, ensuring long-term availability and supply chain stability. It is ROHS3 compliant and available in Tape & Reel packaging, suitable for high-volume production environments. All critical electrical parameters match the original specification, including propagation delay, output drive capability, and supply voltage range. The reduced quiescent current (8 µA vs. 40 µA) provides improved power efficiency without compromising functional compatibility.

MC74ACT377DWG (Secondary Option)

The MC74ACT377DWG provides functional equivalence to the 74ACT377SCX with identical electrical specifications. However, this part carries obsolete product status, which may limit future availability. It is ROHS3 compliant and suitable for applications where Tape & Reel packaging is not required. Selection of this part should be based on immediate inventory availability rather than long-term supply considerations.

Selection Criteria:

For new designs and ongoing production, MC74ACT377DWR2G is the appropriate choice due to active product status and standard production packaging. For legacy system maintenance or applications with existing inventory constraints, MC74ACT377DWG remains functionally compatible. Both substitutes maintain the 20-SOIC package footprint and all critical electrical parameters required for direct board-level replacement.

Frequently Asked Questions (FAQ)

Q: Can MC74ACT377DWR2G be used as a direct replacement for 74ACT377SCX?

A: Yes. Both parts share identical functional specifications, package geometry, and electrical characteristics. The MC74ACT377DWR2G maintains the same 20-SOIC footprint, supply voltage range (4.5V ~ 5.5V), propagation delay (10ns @ 5V, 50pF), and output drive capability (24mA). The part is pin-compatible and requires no circuit modifications.

Q: What is the difference between MC74ACT377DWR2G and MC74ACT377DWG?

A: Both parts are electrically identical with matching functional specifications. The primary difference is packaging format: MC74ACT377DWR2G is supplied in Tape & Reel (TR) format for automated assembly, while MC74ACT377DWG uses standard packaging. MC74ACT377DWR2G carries active product status, while MC74ACT377DWG is obsolete.

Q: Does the lower quiescent current in substitute parts affect circuit operation?

A: No. The reduced quiescent current (8 µA vs. 40 µA) in MC74ACT377DWR2G and MC74ACT377DWG represents improved power efficiency in the manufacturing process. This reduction does not alter functional behavior or electrical performance in the application circuit.

Q: Are the substitute parts RoHS compliant?

A: Yes. Both MC74ACT377DWR2G and MC74ACT377DWG are ROHS3 compliant. The original 74ACT377SCX RoHS status was not specified in the available documentation.

Q: What is the significance of the different Moisture Sensitivity Levels (MSL)?

A: The 74ACT377SCX has MSL 1 (Unlimited), while substitute parts have MSL 3 (168 Hours). MSL 3 requires storage in controlled humidity conditions and has a 168-hour floor life after moisture exposure. This difference reflects manufacturing process updates and does not affect electrical performance. Standard moisture control procedures during storage and assembly are required for MSL 3 components.

Q: Can these parts be used interchangeably in existing PCB designs?

A: Yes. All three parts use the identical 20-SOIC (0.295", 7.50mm Width) package with the same pin configuration and footprint. No PCB layout modifications are required for substitution.