74HCT377N Equivalent & Substitute Parts

Part Overview

The 74HCT377N is a D-type flip-flop logic integrated circuit manufactured by NXP USA Inc., designed for 8-bit parallel data storage and synchronization applications. This component features positive edge triggering, non-inverted outputs, and operates across a 4.5V to 5.5V supply voltage range. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing system maintenance, legacy design support, and component procurement continuity.

Substiute Parts

74HCT377N,652

NXP USA Inc.In Stock: 100574HCT377N,652 Datasheet

Current PartRFQ

CD74HCT377E

Harris CorporationIn Stock: 15902CD74HCT377E Datasheet

DirectRFQ

SN74HCT377N

Texas InstrumentsIn Stock: 3066SN74HCT377N Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 74HCT377N are qualified based on the following critical parameters that determine functional and mechanical compatibility:

Core Functional Parameters:

• Type: D-Type Flip Flop
• Number of Elements: 1
• Number of Bits per Element: 8
• Trigger Type: Positive Edge
• Output Type: Non-Inverted
• Package / Case: 20-DIP (0.300", 7.62mm)
• Mounting Type: Through Hole

Electrical Operating Parameters:

• Voltage - Supply: 4.5V ~ 5.5V
• Current - Quiescent (Iq): 8 µA

Compliance & Status Parameters:

• Base Product Number: 74HCT377
• ECCN: EAR99
• HTSUS: 8542.39.0001

All substitute parts listed maintain identical functional architecture, pinout compatibility, and electrical operating specifications within the specified supply voltage and quiescent current ranges. Variations in clock frequency, propagation delay, output current ratings, input capacitance, and temperature operating ranges are within acceptable tolerance for this logic device category and do not affect core substitution eligibility.

Parameter Comparison

Engineering Selection Recommendations

SN74HCT377N (Texas Instruments) is the preferred substitute for new designs and ongoing procurement. This part maintains active product status, ensuring long-term availability and manufacturer support. It carries ROHS3 compliance certification, meeting modern environmental and regulatory requirements. The SN74HCT377N delivers superior propagation delay performance (28ns @ 5.5V) and maintains full functional and electrical compatibility with the original 74HCT377N specification.

CD74HCT377E (Harris Corporation) serves as an alternative substitute where inventory constraints or legacy system requirements necessitate its use. This part provides extended operating temperature range (-55°C ~ 125°C) suitable for industrial and military applications. However, RoHS non-compliance status and obsolete product classification limit its applicability to existing systems requiring component replacement rather than new designs.

Both substitute parts maintain identical pinout, package geometry, and core electrical operating parameters. Selection between them depends on compliance requirements, temperature operating range specifications, and system-level environmental constraints.

Frequently Asked Questions (FAQ)

Q: Can the SN74HCT377N directly replace the 74HCT377N in existing circuit boards?

A: Yes. The SN74HCT377N maintains identical pinout, 20-DIP package geometry, and electrical operating specifications. Direct socket substitution is mechanically and electrically compatible without circuit modification.

Q: What is the primary difference between the three parts?

A: All three parts share identical functional architecture and core electrical parameters. The primary differences are manufacturer source, product status (active vs. obsolete), RoHS compliance certification, and minor variations in propagation delay and temperature operating range. These variations do not affect substitution eligibility for standard logic applications.

Q: Is the CD74HCT377E suitable for new product designs?

A: The CD74HCT377E is not recommended for new designs due to obsolete product status and RoHS non-compliance. It is suitable only for replacement in existing systems where the original part is no longer available.

Q: Does operating temperature range affect substitution compatibility?

A: Operating temperature range does not affect substitution compatibility for applications operating within the overlapping temperature specification (-40°C ~ 85°C). Applications requiring extended low-temperature operation (-55°C) must use the CD74HCT377E. Applications requiring extended high-temperature operation (125°C) can use either the 74HCT377N or CD74HCT377E.

Q: Are there any input capacitance differences that affect circuit design?

A: Input capacitance variations (3 pF to 10 pF) are within acceptable tolerance for standard logic applications and do not require circuit redesign. High-speed or noise-sensitive applications should account for these minor differences in timing analysis.

Q: What packaging options are available for these parts?

A: All three parts are supplied in 20-DIP (0.300", 7.62mm) through-hole package format. No surface-mount or alternative package options are available for this product line.