74HC377N Equivalent & Substitute Parts

Part Overview

The 74HC377N is a D-type flip-flop logic integrated circuit manufactured by NXP Semiconductors, designed for 8-bit parallel data storage and synchronization applications. This component features positive edge triggering, non-inverted outputs, and operates across a 2V to 6V supply voltage range. The part is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations.

Substiute Parts

74HC377N,652

NXP SemiconductorsIn Stock: 106474HC377N,652 Datasheet

Current PartRFQ

SN74HC377N

Texas InstrumentsIn Stock: 2021SN74HC377N Datasheet

DirectRFQ

CD74HC377E

Harris CorporationIn Stock: 1995CD74HC377E Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 74HC377N are qualified based on the following critical parameters that determine functional equivalence:

Core Electrical Parameters:

• Type: D-Type Flip-Flop
• Number of Elements: 1
• Number of Bits per Element: 8
• Trigger Type: Positive Edge
• Output Type: Non-Inverted
• Voltage - Supply: 2V ~ 6V
• Current - Output High, Low: 5.2mA, 5.2mA
• Current - Quiescent (Iq): 8 µA

Mechanical Parameters:

• Package / Case: 20-DIP (0.300", 7.62mm)
• Mounting Type: Through Hole

Compliance Parameters:

• ECCN: EAR99
• HTSUS: 8542.39.0001

All identified substitute parts maintain these core parameters, ensuring direct functional compatibility in applications designed for the 74HC377N.

Parameter Comparison

Engineering Selection Recommendations

SN74HC377N (Texas Instruments) is the primary substitute for new designs and ongoing production. This part is currently active in the market, ROHS3 compliant, and maintains identical propagation delay specifications (27ns @ 6V, 50pF) and supply voltage range. The operating temperature range is limited to -40°C ~ 85°C compared to the original part's -40°C ~ 125°C specification; applications requiring operation above 85°C must evaluate thermal requirements independently.

CD74HC377E (Harris Corporation) provides an alternative substitute with extended operating temperature range (-55°C ~ 125°C), suitable for applications requiring low-temperature operation. However, this part is obsolete and RoHS non-compliant. The propagation delay is 30ns at 6V with 50pF load, representing a 3ns increase compared to the primary part. Input capacitance is elevated at 10 pF relative to the original 4.6 pF specification.

For applications with strict RoHS compliance requirements and active product availability, SN74HC377N is the recommended selection. For legacy systems or applications requiring extended temperature operation without RoHS constraints, CD74HC377E remains functionally compatible.

Frequently Asked Questions (FAQ)

Q: Can SN74HC377N directly replace 74HC377N in existing designs?

A: Yes. Both parts share identical package geometry (20-DIP), mounting type (Through Hole), electrical specifications for output current, supply voltage, and propagation delay. The primary consideration is the reduced upper operating temperature limit of SN74HC377N (85°C versus 125°C). Verify that your application's maximum operating temperature does not exceed 85°C.

Q: What is the difference in propagation delay between these parts?

A: The 74HC377N and SN74HC377N both specify 27ns maximum propagation delay at 6V with 50pF load. The CD74HC377E specifies 30ns under identical conditions, representing a 3ns increase. For timing-critical applications, verify that the 30ns specification remains within system timing margins.

Q: Are all substitute parts RoHS compliant?

A: SN74HC377N and 74HC377N are both ROHS3 compliant. CD74HC377E is RoHS non-compliant. For applications subject to RoHS regulations, SN74HC377N is the appropriate selection.

Q: Do these parts require different PCB footprints?

A: No. All three parts use identical 20-DIP (0.300", 7.62mm) package geometry and Through Hole mounting type. PCB footprints and assembly processes remain unchanged.

Q: What is the inventory status of these substitute parts?

A: Inventory information is subject to change. Consult current distributor databases for real-time availability: SN74HC377N (Texas Instruments, Active status), CD74HC377E (Harris Corporation, Obsolete status).