74F377SJ Equivalent & Substitute Parts

Part Overview

The 74F377SJ 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 with non-inverted outputs, designed for synchronous data capture and storage applications in digital systems.

The 74F377SJ carries an obsolete product status. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or maintenance requirements for systems utilizing this component.

Substiute Parts

74F377SJ

onsemiIn Stock: 80374F377SJ Datasheet

Current PartRFQ

SN74F377ADW

Texas InstrumentsIn Stock: 1659SN74F377ADW Datasheet

SimilarRFQ

SN74F377ADWR

Texas InstrumentsIn Stock: 1109SN74F377ADWR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 74F377SJ are identified based on strict equivalence of core functional and electrical parameters. The following criteria determine valid substitution:

Core Functional Parameters (Must Match):

• Base product number: 74F377
• Type: D-Type flip-flop
• Number of elements: 1
• Number of bits per element: 8
• Output type: Non-inverted
• Trigger type: Positive edge

Electrical Parameters (Must Be Compatible):

• Voltage supply range: 4.5V ~ 5.5V
• Current output specifications: 1 mA (high), 20 mA (low)
• Operating temperature range: 0°C ~ 70°C

Mechanical Parameters (Must Be Compatible):

• Mounting type: Surface mount
• Package type: 20-SOIC

Variations in clock frequency, propagation delay, quiescent current, and specific package dimensions are permitted within the 74F377 product family, provided all core functional and electrical parameters remain equivalent.

Parameter Comparison

Engineering Selection Recommendations

SN74F377ADWR (Texas Instruments) - Recommended Primary Substitute

The SN74F377ADWR is the preferred substitute for the obsolete 74F377SJ. This part maintains active product status with Texas Instruments, ensuring long-term availability and supply chain stability. The component is ROHS3 compliant and available in Tape & Reel packaging format, supporting high-volume production environments. All core functional and electrical parameters are equivalent to the 74F377SJ. The slightly higher quiescent current (72 mA versus 48 mA) and marginally increased propagation delay (9 ns versus 7 ns) remain within acceptable operational tolerances for standard 74F logic applications.

SN74F377ADW (Texas Instruments) - Secondary Substitute

The SN74F377ADW provides functional equivalence to the 74F377SJ with identical electrical specifications. This part carries Last Time Buy status, indicating limited future availability. The component is ROHS3 compliant and supplied in Tube packaging format. Selection of this part should be considered only when Tape & Reel packaging is not required or when existing inventory must be utilized before discontinuation.

Package Dimension Consideration

Both Texas Instruments substitutes feature a 20-SOIC package with 0.295" (7.50mm) width, compared to the 74F377SJ's 0.209" (5.30mm) width. This dimensional difference requires verification of PCB layout compatibility, particularly in space-constrained applications. The functional pinout remains identical across all three parts.

Frequently Asked Questions (FAQ)

Q: Can the SN74F377ADW or SN74F377ADWR be used as direct replacements for the 74F377SJ?

A: Yes. Both Texas Instruments parts are functionally equivalent substitutes. They share identical core specifications: D-Type flip-flop architecture, 1 element, 8-bit configuration, positive edge triggering, non-inverted outputs, and compatible voltage/current ratings. The SN74F377ADWR is preferred due to active product status.

Q: What are the differences between SN74F377ADW and SN74F377ADWR?

A: Both parts are electrically identical. The primary differences are packaging format (Tube versus Tape & Reel) and product status (Last Time Buy versus Active). The SN74F377ADWR is recommended for new designs and ongoing production due to its active status and standard reel packaging.

Q: Does the package size difference affect compatibility?

A: The substitute parts use a 20-SOIC package with larger dimensions (0.295" width) compared to the 74F377SJ (0.209" width). PCB layout must be verified to ensure the larger package fits within available space. The functional pinout is identical, so electrical compatibility is maintained.

Q: Are the substitute parts RoHS compliant?

A: Yes. Both SN74F377ADW and SN74F377ADWR are ROHS3 compliant. The 74F377SJ RoHS status was not specified in the original documentation.

Q: What is the impact of higher quiescent current in the substitute parts?

A: The Texas Instruments substitutes draw 72 mA quiescent current compared to 48 mA for the 74F377SJ. This 24 mA increase affects total system power consumption but does not impact functional operation or signal integrity in standard applications.

Q: Can I use the SN74F377ADW if the SN74F377ADWR is unavailable?

A: Yes. The SN74F377ADW is functionally equivalent and can serve as a substitute. However, verify that Tube packaging meets your production requirements, as this format is typically used for lower-volume or manual assembly processes rather than automated reel-based production.