74ABT377CSJ Equivalent & Substitute Parts

Part Overview

The 74ABT377CSJ is an octal D-type flip-flop logic integrated circuit manufactured by onsemi, housed in a 20-SOIC package. This component functions as a standard 8-bit positive edge-triggered flip-flop with non-inverted outputs, operating at clock frequencies up to 200 MHz. The part is currently obsolete, making equivalent substitutes necessary for ongoing design support and production continuity. Substitute parts must maintain functional equivalence in D-type flip-flop operation, 8-bit configuration, positive edge triggering, and compatible packaging while meeting modern supply chain availability and compliance requirements.

Substiute Parts

74ABT377CSJ

onsemiIn Stock: 74174ABT377CSJ Datasheet

Current PartRFQ

SN74ABT377ANS

Texas InstrumentsIn Stock: 2276SN74ABT377ANS Datasheet

DirectRFQ

SN74ABT377ANSR

Texas InstrumentsIn Stock: 3000SN74ABT377ANSR Datasheet

DirectRFQ

CY74FCT377ATSOC

Texas InstrumentsIn Stock: 2019CY74FCT377ATSOC Datasheet

SimilarRFQ

SN74ABT377ADW

Texas InstrumentsIn Stock: 1271SN74ABT377ADW Datasheet

SimilarRFQ

SN74ABT377ADWR

Texas InstrumentsIn Stock: 2395SN74ABT377ADWR Datasheet

SimilarRFQ

SN74LS377DW

Texas InstrumentsIn Stock: 6633SN74LS377DW Datasheet

SimilarRFQ

SN74LS377DWR

Texas InstrumentsIn Stock: 978SN74LS377DWR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 74ABT377CSJ is determined by the following critical parameters:

Functional Requirements:

• Type: D-Type flip-flop
• Number of bits per element: 8
• Trigger type: Positive edge
• Output type: Non-inverted

Electrical Compatibility:

• Voltage supply range: 4.5V ~ 5.5V (or compatible subset)
• Max propagation delay: 6.8 ns @ 5V, 50pF or faster
• Current output capability: 32 mA (high), 64 mA (low) or greater
• Operating temperature: -40°C ~ 85°C or compatible range

Physical Compatibility:

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

Substitute parts are classified into two categories:

Direct Substitutes (Functional and Electrical Equivalence):

• SN74ABT377ANS
• SN74ABT377ANSR

These parts maintain identical functional specifications, electrical performance, and package dimensions as the main part.

Similar Substitutes (Functional Equivalence with Parameter Variations):

• CY74FCT377ATSOC (74FCT series, slightly different voltage range and propagation delay)
• SN74ABT377ADW (74ABT series, wider package body)
• SN74ABT377ADWR (74ABT series, wider package body, tape & reel)
• SN74LS377DW (74LS series, significantly reduced clock frequency and performance)
• SN74LS377DWR (74LS series, significantly reduced clock frequency and performance)

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Preferred):

SN74ABT377ANS and SN74ABT377ANSR are the primary substitutes for the 74ABT377CSJ. Both parts are manufactured by Texas Instruments, maintain active product status, and deliver identical electrical performance with matching propagation delay specifications. Both are ROHS3 compliant with MSL 1 rating. The ANS variant is available in bulk packaging, while ANSR is supplied in tape & reel format. Selection between these two depends on procurement and assembly requirements.

For Pin-Compatible Replacement with Package Variation:

SN74ABT377ADW and SN74ABT377ADWR maintain functional and electrical equivalence but feature a wider 20-SOIC package body (0.295" vs. 0.209"). These parts are suitable for designs where PCB layout accommodates the larger package footprint. Both are ROHS3 compliant and active products. ADW is supplied in tube packaging; ADWR is supplied in tape & reel.

For Performance-Reduced Applications:

CY74FCT377ATSOC (74FCT series) operates within a narrower voltage range (4.75V ~ 5.25V) and exhibits slightly higher propagation delay (7.2 ns). This part is suitable only for applications where the reduced voltage tolerance and marginally slower performance are acceptable. The wider package body (0.295") requires PCB layout verification.

For Legacy or Low-Speed Applications:

SN74LS377DW and SN74LS377DWR (74LS series) are suitable only for applications operating at clock frequencies below 40 MHz. These parts exhibit significantly reduced output current capability (400 µA / 8 mA vs. 32 mA / 64 mA) and operate within a narrower temperature range (0°C ~ 70°C). Use is restricted to designs where performance degradation is acceptable and operating conditions remain within the specified limits.

All substitute parts maintain the same functional architecture (D-type flip-flop, 8-bit, positive edge trigger, non-inverted output) and are surface-mount compatible with standard assembly processes.

Frequently Asked Questions (FAQ)

Q: Can SN74ABT377ANS be used as a direct replacement for 74ABT377CSJ?

A: Yes. SN74ABT377ANS is a direct functional and electrical equivalent. Both parts share identical propagation delay (6.8 ns @ 5V, 50pF), voltage supply range (4.5V ~ 5.5V), output current ratings (32 mA / 64 mA), and operating temperature range (-40°C ~ 85°C). The primary difference is manufacturer (Texas Instruments vs. onsemi) and product status (active vs. obsolete). Both are housed in 20-SOIC packages with 5.30mm body width.

Q: What is the difference between SN74ABT377ANS and SN74ABT377ANSR?

A: Both parts are electrically identical. The difference is packaging format: ANS is supplied in bulk, while ANSR is supplied in tape & reel (TR) format. Selection depends on assembly process requirements and procurement preferences.

Q: Why do SN74ABT377ADW and SN74ABT377ADWR have a wider package body?

A: The ADW and ADWR variants use a 20-SOIC package with 0.295" body width, compared to 0.209" for the ANS variants. This represents a different package manufacturing specification. Both are functionally equivalent and electrically identical. PCB layout must accommodate the wider body dimension.

Q: Can I use SN74LS377DW in place of 74ABT377CSJ?

A: SN74LS377DW is functionally compatible but exhibits significant performance degradation. Clock frequency is limited to 40 MHz (vs. 200 MHz), propagation delay is 27 ns (vs. 6.8 ns), and output current is reduced to 400 µA / 8 mA (vs. 32 mA / 64 mA). Operating temperature range is also narrower (0°C ~ 70°C vs. -40°C ~ 85°C). Use only in applications where these limitations are acceptable.

Q: What does ROHS3 compliance mean for these parts?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting the use of specific hazardous materials in electrical and electronic equipment. All active substitute parts listed are ROHS3 compliant. The obsolete 74ABT377CSJ does not specify RoHS status.

Q: Are all substitute parts available in the same packaging options?

A: No. Packaging availability varies by part number. SN74ABT377ANS is available in bulk; SN74ABT377ANSR is available in tape & reel. SN74ABT377ADW is available in tube; SN74ABT377ADWR is available in tape & reel. SN74LS377DW is available in bulk; SN74LS377DWR is available in tape & reel. Select based on assembly process requirements.

Q: What is the significance of MSL 1 (Unlimited) rating?

A: MSL 1 indicates the component has unlimited shelf life and does not require special moisture control during storage or handling. All substitute parts except SN74LS377DW carry MSL 1 rating, providing flexibility in inventory management and supply chain logistics.

Q: Can CY74FCT377ATSOC be used in designs requiring 4.5V supply voltage?

A: No. CY74FCT377ATSOC operates within a narrower voltage range of 4.75V ~ 5.25V. Designs requiring 4.5V supply voltage must use 74ABT series parts (SN74ABT377ANS, SN74ABT377ANSR, SN74ABT377ADW, or SN74ABT377ADWR), which support the full 4.5V ~ 5.5V range.

Q: What is the quiescent current difference between substitute parts?

A: Quiescent current (Iq) varies significantly across substitutes. The original 74ABT377CSJ specifies 50 µA. SN74ABT377ANS draws 30 mA, while SN74ABT377ANSR and 74ABT ADW/ADWR variants draw 250 µA. CY74FCT377ATSOC draws 200 µA. SN74LS377DW draws 18 mA, and SN74LS377DWR draws 28 mA. For power-sensitive applications, verify quiescent current specifications against design requirements.