74ABT377CSC Equivalent & Substitute Parts

Part Overview

The 74ABT377CSC is an octal D-type flip-flop logic integrated circuit manufactured by onsemi, housed in a 20-SOIC surface mount package. This device functions as a standard 8-bit positive edge-triggered flip-flop with non-inverted outputs. The part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity.

Substiute Parts

74ABT377CSC

onsemiIn Stock: 110874ABT377CSC Datasheet

Current PartRFQ

SN74ABT377ADW

Texas InstrumentsIn Stock: 1271SN74ABT377ADW Datasheet

DirectRFQ

SN74ABT377ADWR

Texas InstrumentsIn Stock: 2395SN74ABT377ADWR Datasheet

DirectRFQ

CY74FCT377ATSOC

Texas InstrumentsIn Stock: 2019CY74FCT377ATSOC Datasheet

SimilarRFQ

SN74LS377DW

Texas InstrumentsIn Stock: 6633SN74LS377DW Datasheet

SimilarRFQ

SN74LS377DWR

Texas InstrumentsIn Stock: 978SN74LS377DWR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 74ABT377CSC is determined by the following critical parameters:

• Package Compatibility: All substitute parts must use the 20-SOIC (0.295", 7.50mm Width) surface mount package to ensure PCB footprint compatibility.
• Functional Equivalence: All parts must be D-type flip-flops with 8-bit configuration, positive edge triggering, and non-inverted outputs.
• Electrical Specifications: Supply voltage range, output drive capability (current ratings), and propagation delay characteristics must be compatible with the original design.
• Pin Configuration: All parts maintain identical pinout within the 20-SOIC package.

Substitute parts are categorized as follows:

Direct Substitutes (74ABT Series): SN74ABT377ADW and SN74ABT377ADWR maintain the same series designation and electrical characteristics, with active product status and full compliance certifications.

Similar Substitutes (Alternative Series): CY74FCT377ATSOC (74FCT series) and SN74LS377DW / SN74LS377DWR (74LS series) provide functional equivalence with variations in performance characteristics and operating parameters.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes: SN74ABT377ADW and SN74ABT377ADWR are the preferred direct replacements for the obsolete 74ABT377CSC. Both parts maintain identical electrical performance characteristics, including propagation delay and output drive capability. Both are active products with ROHS3 compliance and full regulatory certifications (REACH Unaffected, EAR99). The primary difference between these two is packaging: SN74ABT377ADW is supplied in Tube packaging, while SN74ABT377ADWR is supplied in Tape & Reel format for automated assembly.

Secondary Substitute: CY74FCT377ATSOC (74FCT series) provides functional equivalence with slightly degraded propagation delay (7.2ns versus 6.8ns) and operates within a narrower supply voltage range (4.75V ~ 5.25V). This part is suitable for applications where the tighter voltage tolerance is acceptable and the marginal increase in propagation delay does not impact system timing requirements.

Alternative Substitutes: SN74LS377DW and SN74LS377DWR (74LS series) represent lower-performance alternatives with significantly reduced clock frequency (40 MHz), increased propagation delay (27ns), and substantially higher quiescent current (18-28 mA). These parts are suitable only for legacy designs or applications with relaxed timing requirements. Operating temperature range is limited to 0°C ~ 70°C, restricting use in extended temperature environments.

Frequently Asked Questions (FAQ)

Q: Can SN74ABT377ADW directly replace the 74ABT377CSC without PCB modifications?

A: Yes. Both parts use identical 20-SOIC (0.295", 7.50mm Width) surface mount packages with matching pinouts. No PCB layout changes are required.

Q: What is the difference between SN74ABT377ADW and SN74ABT377ADWR?

A: Both parts are electrically identical. The difference is packaging: ADW is supplied in Tube format for manual handling, while ADWR is supplied in Tape & Reel format for automated pick-and-place assembly. Select based on your assembly process requirements.

Q: Is CY74FCT377ATSOC a suitable replacement for high-speed applications?

A: CY74FCT377ATSOC is functionally compatible but operates at reduced performance. With a maximum propagation delay of 7.2ns compared to 6.8ns for the 74ABT series, it introduces a 0.4ns timing penalty. Verify that your system timing budget accommodates this additional delay before selection.

Q: Can I use SN74LS377DW in place of the 74ABT377CSC?

A: SN74LS377DW provides functional equivalence but with significant performance trade-offs. Clock frequency is limited to 40 MHz (versus 200 MHz for 74ABT), propagation delay increases to 27ns, and quiescent current rises to 18 mA. Additionally, the operating temperature range is restricted to 0°C ~ 70°C, excluding extended temperature applications. Use only if your design specifications permit these limitations.

Q: What compliance certifications should I verify for production use?

A: All active substitute parts (SN74ABT377ADW, SN74ABT377ADWR, CY74FCT377ATSOC, and SN74LS377DWR) carry ROHS3 compliance and REACH Unaffected status. Verify ECCN and HTSUS classifications (both listed as EAR99 and 8542.39.0001 respectively) for export and tariff compliance in your supply chain.

Q: Does supply voltage range affect substitution compatibility?

A: The 74ABT377CSC operates at 4.5V ~ 5.5V. SN74ABT377ADW and SN74ABT377ADWR maintain this range. CY74FCT377ATSOC and 74LS series parts operate at the narrower 4.75V ~ 5.25V range. If your design uses supply voltages below 4.75V or above 5.25V, only the 74ABT series substitutes are compatible.