74ACT377SC Equivalent & Substitute Parts

Part Overview

The 74ACT377SC is a D-type flip-flop logic integrated circuit manufactured by onsemi, featuring 1 element with 8-bit parallel data storage capability. This component operates as a standard positive edge-triggered flip-flop in the 74ACT logic family, housed in a 20-SOIC surface mount package. The part is currently obsolete, making equivalent substitute parts necessary for ongoing design support and production requirements.

Key Parameters

Parameter	Value
Manufacturer Part Number	74ACT377SC
Manufacturer	onsemi
Logic Family	74ACT
Function Type	D-Type Flip-Flop
Number of Elements	1
Number of Bits per Element	8
Package Type	20-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount
Voltage Supply Range	4.5V ~ 5.5V
Operating Temperature Range	-40°C ~ 85°C
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the 74ACT377SC are qualified based on the following electrical and mechanical compatibility criteria:

Electrical Parameters:

Logic family classification (74ACT)
D-type flip-flop function with 8-bit configuration
Positive edge trigger operation
Non-inverted output type
Voltage supply range: 4.5V ~ 5.5V
Operating temperature range: -40°C ~ 85°C
Output drive capability: 24mA high and low
Propagation delay: 10ns @ 5V, 50pF

Mechanical Parameters:

Package type: 20-SOIC (0.295", 7.50mm Width)
Surface mount mounting type
Pin-for-pin compatibility

The substitute parts identified maintain functional equivalence through identical logic operation, electrical specifications, and physical packaging, enabling direct replacement in circuit designs.

Parameter Comparison

Parameter	74ACT377SC (Main)	MC74ACT377DWR2G	MC74ACT377DWG
Manufacturer	onsemi	onsemi	onsemi
Logic Family	74ACT	74ACT	74ACT
Function Type	D-Type Flip-Flop	D-Type Flip-Flop	D-Type Flip-Flop
Number of Elements	1	1	1
Number of Bits per Element	8	8	8
Output Type	Non-Inverted	Non-Inverted	Non-Inverted
Trigger Type	Positive Edge	Positive Edge	Positive Edge
Clock Frequency	175 MHz	140 MHz	140 MHz
Max Propagation Delay @ V, Max CL	10ns @ 5V, 50pF	10ns @ 5V, 50pF	10ns @ 5V, 50pF
Current - Output High, Low	24mA, 24mA	24mA, 24mA	24mA, 24mA
Voltage - Supply	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V
Input Capacitance	4.5 pF	4.5 pF	4.5 pF
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	20-SOIC (0.295", 7.50mm Width)	20-SOIC (0.295", 7.50mm Width)	20-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Active	Obsolete
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

MC74ACT377DWR2G is the primary substitute for the 74ACT377SC. This part maintains full electrical and mechanical compatibility while offering active product status from onsemi. The part is supplied in Tape & Reel packaging and carries ROHS3 compliance certification. The quiescent current specification (8 µA) is lower than the main part (40 µA), representing an improvement in power efficiency. Clock frequency is rated at 140 MHz compared to 175 MHz for the main part; however, propagation delay and output drive specifications remain identical, ensuring functional equivalence in standard applications.

MC74ACT377DWG serves as an alternative substitute with identical electrical specifications to MC74ACT377DWR2G. This part carries obsolete product status similar to the main part but provides ROHS3 compliance. Selection between MC74ACT377DWR2G and MC74ACT377DWG should be based on packaging requirements and supply chain availability, as both offer equivalent electrical performance.

Frequently Asked Questions (FAQ)

Q: Can MC74ACT377DWR2G directly replace 74ACT377SC in existing designs?

A: Yes. Both parts share identical logic function, pin configuration, electrical specifications for propagation delay and output drive, and 20-SOIC package dimensions. Direct substitution is supported without circuit modification.

Q: What is the difference between MC74ACT377DWR2G and MC74ACT377DWG?

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

Q: Why does the main part specify 175 MHz clock frequency while substitutes specify 140 MHz?

A: Clock frequency specifications may vary between manufacturing revisions within the same logic family. Both the main part and substitutes maintain identical propagation delay (10ns @ 5V, 50pF) and output drive specifications (24mA), which are the critical parameters for functional compatibility in standard applications.

Q: Is the lower quiescent current of MC74ACT377DWR2G (8 µA vs. 40 µA) significant for design considerations?

A: The lower quiescent current in MC74ACT377DWR2G represents improved power efficiency and is beneficial for battery-powered or low-power applications. This difference does not affect functional compatibility and may provide design advantages in power-sensitive systems.

Q: Are there packaging considerations when selecting between these substitutes?

A: MC74ACT377DWR2G is available in Tape & Reel format suitable for automated assembly, while MC74ACT377DWG uses standard packaging. Selection should align with your manufacturing process and supply chain requirements. Both maintain identical 20-SOIC package dimensions.

Q: What compliance certifications apply to these substitute parts?

A: MC74ACT377DWR2G and MC74ACT377DWG both carry ROHS3 compliance certification. All parts are REACH Unaffected and classified under ECCN EAR99 and HTSUS 8542.39.0001.

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