SNJ54LS374J Equivalent & Substitute Parts

Part Overview

The SNJ54LS374J is an octal D-type edge-triggered flip-flop logic integrated circuit manufactured by Texas Instruments. This device functions as a standard 8-bit positive edge-triggered flip-flop with tri-state, non-inverted outputs, housed in a 20-pin CDIP package. The SNJ54LS374J maintains active product status and is currently in stock with 1208 units available. Substitute parts are necessary when addressing supply constraints, obsolescence of primary sources, or when alternative manufacturers' components meet identical electrical and mechanical specifications.

Substiute Parts

SNJ54LS374J

Texas InstrumentsIn Stock: 1291SNJ54LS374J Datasheet

Current PartRFQ

SN74LS374N

onsemiIn Stock: 3759SN74LS374N Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SNJ54LS374J is determined by strict equivalence across the following critical parameters:

• Functional Type: D-Type flip-flop with 8-bit configuration and positive edge triggering
• Output Configuration: Tri-state, non-inverted outputs
• Electrical Performance: Clock frequency of 50 MHz, propagation delay of 28 ns @ 5V with 45pF load
• Supply Voltage Range: 4.5V to 5.5V operation
• Package Compatibility: 20-pin DIP-class through-hole packages (CDIP or PDIP variants)
• Quiescent Current: 40 mA maximum

The SN74LS374N qualifies as a substitute based on matching all functional, electrical, and mechanical parameters. Differences in product status, compliance certifications, and operating temperature range are secondary considerations that do not affect electrical interchangeability in applications within the overlapping temperature specification.

Parameter Comparison

Engineering Selection Recommendations

The SN74LS374N is electrically and mechanically interchangeable with the SNJ54LS374J for applications operating within the temperature range of 0°C to 70°C. Both devices share identical functional specifications, clock frequency, propagation delay, and quiescent current characteristics.

Selection between these parts should consider the following factors:

SNJ54LS374J (Primary Selection)

• Active product status ensures continued availability
• ROHS3 compliance supports modern supply chain requirements
• Extended operating temperature range (-55°C to 125°C) accommodates industrial and military applications
• Wider supply voltage tolerance (4.5V to 5.5V) provides greater design margin

SN74LS374N (Substitute Selection)

• Suitable for commercial-grade applications limited to 0°C to 70°C operation
• RoHS non-compliance restricts use in regulated markets
• Obsolete status indicates limited future availability
• Narrower supply voltage range (4.75V to 5.25V) requires tighter power supply regulation

Frequently Asked Questions (FAQ)

Q: Can the SN74LS374N directly replace the SNJ54LS374J in all applications?

A: Direct replacement is valid only for applications operating within the 0°C to 70°C temperature range. The SNJ54LS374J supports extended temperatures from -55°C to 125°C. If your application requires operation outside the 0°C to 70°C window, the SN74LS374N is not suitable.

Q: What is the difference between the 54LS and 74LS series designations?

A: The 54LS series (SNJ54LS374J) is qualified for military and extended temperature applications (-55°C to 125°C). The 74LS series (SN74LS374N) is rated for commercial temperature ranges (0°C to 70°C). Both share identical electrical specifications within their respective operating ranges.

Q: Are the CDIP and DIP packages physically compatible?

A: Both the 20-CDIP and 20-DIP packages are 0.300" (7.62mm) wide through-hole packages with identical pin spacing and footprints. They are mechanically interchangeable on standard PCB layouts.

Q: Does RoHS compliance affect electrical performance?

A: RoHS compliance does not alter electrical performance. The ROHS3 compliance of the SNJ54LS374J indicates lead-free manufacturing and environmental compliance. The RoHS non-compliance of the SN74LS374N may restrict its use in applications subject to environmental regulations.

Q: What are the output current differences between these parts?

A: The SNJ54LS374J specifies 1mA output high and 12mA output low current. The SN74LS374N specifies 2.6mA output high and 24mA output low current. Both devices maintain tri-state output capability and are suitable for standard logic-level applications.

Q: Can I use the SN74LS374N in a design originally specified for the SNJ54LS374J?

A: Substitution is valid only if your application operates within 0°C to 70°C and does not require RoHS compliance. Verify that your power supply voltage remains within the narrower 4.75V to 5.25V range of the SN74LS374N. If your design requires extended temperature operation or RoHS compliance, the SNJ54LS374J is the appropriate choice.