74HC377DB,112 Equivalent & Substitute Parts

Part Overview

The 74HC377DB,112 is a D-Type flip-flop logic integrated circuit manufactured by Nexperia USA Inc., featuring 1 element with 8-bit capacity and positive edge triggering. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The part operates across a 2V to 6V supply range with a maximum propagation delay of 27ns at 6V with 50pF load, suitable for standard logic applications requiring edge-triggered data storage.

Substiute Parts

74HC377DB,112

Nexperia USA Inc.In Stock: 87574HC377DB,112 Datasheet

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CD74HC377PW

Texas InstrumentsIn Stock: 1195CD74HC377PW Datasheet

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CD74HC377PWR

Texas InstrumentsIn Stock: 15786CD74HC377PWR Datasheet

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SN74ABT377ADBR

Texas InstrumentsIn Stock: 1161SN74ABT377ADBR Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 74HC377DB,112 is determined by the following critical parameters: D-Type flip-flop function with 1 element and 8-bit capacity, positive edge triggering, non-inverted output, surface mount packaging, and compliance with ROHS3 and REACH standards. The substitute parts identified fall into two functional groups based on package compatibility and electrical performance characteristics.

Group 1: Package-Compatible Substitutes (20-SSOP)

• SN74ABT377ADBR: Maintains identical 20-SSOP package footprint with enhanced performance specifications

Group 2: Functionally Equivalent Substitutes (20-TSSOP)

• CD74HC377PW and CD74HC377PWR: Functionally equivalent with different package form factor (20-TSSOP, 0.173" width vs. 0.209" width)

All substitute parts share the same base product number (74HC or 74ABT series), D-Type configuration, 8-bit architecture, positive edge trigger, and non-inverted output topology. Substitution decisions must account for package footprint compatibility on the target PCB and electrical performance requirements specific to the application.

Parameter Comparison

Engineering Selection Recommendations

For Direct Package Replacement (20-SSOP Footprint)

The SN74ABT377ADBR is the primary substitute for direct PCB footprint compatibility, maintaining the identical 20-SSOP package dimensions. This part is currently active with full manufacturer support. The SN74ABT377ADBR operates within a narrower supply voltage range (4.5V ~ 5.5V) compared to the main part (2V ~ 6V), requiring circuit voltage verification before selection. The ABT series delivers superior propagation delay performance (6.8ns vs. 27ns) and higher output current capability (32mA/64mA vs. 5.2mA/5.2mA), making it suitable for applications requiring faster switching or higher drive capability. Quiescent current is elevated at 250 µA relative to the main part's 8 µA, which may impact low-power applications.

For Functional Equivalence with Package Redesign (20-TSSOP Footprint)

The CD74HC377PWR is the recommended substitute when PCB layout redesign is acceptable. This part is currently active and maintains full functional equivalence with the main part across all critical parameters: D-Type configuration, 8-bit capacity, positive edge triggering, and non-inverted output. The CD74HC377PWR operates across the same 2V ~ 6V supply range and delivers comparable propagation delay (30ns vs. 27ns). The 20-TSSOP package is narrower (0.173" vs. 0.209"), offering improved PCB density. Extended operating temperature range (-55°C ~ 125°C vs. -40°C ~ 125°C) provides additional thermal margin. All three substitute parts maintain ROHS3 compliance and MSL 1 rating, ensuring regulatory and environmental compatibility.

Frequently Asked Questions (FAQ)

Q: Can the SN74ABT377ADBR be used as a direct replacement without PCB modification?

A: Yes, the SN74ABT377ADBR maintains identical 20-SSOP package footprint and pinout compatibility. However, the narrower supply voltage range (4.5V ~ 5.5V) requires circuit verification if the original design operates outside this window. The higher output current and faster propagation delay are generally beneficial but must be evaluated for signal integrity and power consumption impact.

Q: What is the primary difference between CD74HC377PW and CD74HC377PWR?

A: Both parts are functionally identical D-Type flip-flops with 8-bit capacity. The difference is packaging format: CD74HC377PW is supplied in Tube packaging, while CD74HC377PWR is supplied in Tape & Reel (TR) format. CD74HC377PWR is currently active; CD74HC377PW is discontinued at DiGi Electronics. For new designs, CD74HC377PWR is the preferred selection.

Q: Can I use the CD74HC377PWR if my PCB is designed for 20-SSOP?

A: No. The CD74HC377PWR uses 20-TSSOP packaging with different physical dimensions (0.173" width vs. 0.209" width). PCB footprint redesign is required. This substitution is only viable when layout modification is feasible.

Q: How do the electrical characteristics compare between the main part and substitutes?

A: The CD74HC377PWR provides the closest electrical match with 30ns propagation delay versus 27ns for the main part, operating across the same 2V ~ 6V supply range. The SN74ABT377ADBR offers superior speed (6.8ns) but requires 4.5V ~ 5.5V supply and draws higher quiescent current (250 µA vs. 8 µA). Selection depends on application speed requirements and power budget constraints.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All three substitute parts (CD74HC377PW, CD74HC377PWR, and SN74ABT377ADBR) are ROHS3 compliant with MSL 1 rating, matching the main part's regulatory status.

Q: Which substitute should I select for a new design?

A: For new designs, CD74HC377PWR is recommended due to active product status, full functional equivalence, and wide supply voltage range compatibility. If 20-SSOP package footprint is mandatory, SN74ABT377ADBR is the active alternative, with consideration for its narrower voltage range and higher power consumption.