SN74AC74NSR Equivalent & Substitute Parts

Part Overview

The SN74AC74NSR is a dual D-type flip-flop logic integrated circuit manufactured by Texas Instruments. This device features two independent D-type flip-flops with set and reset functionality, operating at a maximum clock frequency of 160 MHz. The part is currently in active production status with 3400 units available in inventory.

Substitute parts become necessary when the primary part reaches end-of-life status, experiences supply constraints, or when design requirements permit functional equivalents with compatible electrical and mechanical characteristics. The NLV74AC74DR2G from onsemi represents an available alternative within the same logic family.

Substiute Parts

SN74AC74NSR

Texas InstrumentsIn Stock: 3440SN74AC74NSR Datasheet

Current PartRFQ

NLV74AC74DR2G

onsemiIn Stock: 3631NLV74AC74DR2G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SN74AC74NSR is determined by the following critical parameters:

Functional Equivalence Requirements:

• Same logic family (74AC series)
• Dual D-type flip-flop configuration with 2 elements, 1 bit per element
• Complementary output type
• Positive edge trigger functionality
• Set and reset capability

Electrical Compatibility Requirements:

• Clock frequency: 160 MHz minimum
• Supply voltage range: 2V to 6V
• Operating temperature range: -40°C to 85°C
• Output current capability: 24mA high and low
• Propagation delay within acceptable limits for timing-critical applications

Mechanical and Packaging Requirements:

• 14-pin SOIC package format
• Surface mount mounting type
• Compatible PCB footprint dimensions

The NLV74AC74DR2G from onsemi meets these functional and electrical criteria, though with minor variations in propagation delay and quiescent current specifications.

Parameter Comparison

Engineering Selection Recommendations

Primary Part (SN74AC74NSR): The SN74AC74NSR is recommended for new designs and applications requiring active product status with ongoing manufacturer support. This part offers superior quiescent current performance (2 µA versus 40 µA) and faster propagation delay (10ns versus 12.5ns), making it suitable for power-sensitive and timing-critical applications. Both parts maintain ROHS3 compliance and identical supply voltage and temperature operating ranges.

Substitute Part (NLV74AC74DR2G): The NLV74AC74DR2G is suitable as a functional substitute when the primary part is unavailable, provided that the application tolerates the increased quiescent current and slightly longer propagation delay. This part carries obsolete product status, indicating limited future availability. The package width difference (3.90mm versus 5.30mm) requires verification of PCB layout compatibility before implementation.

Selection between these parts should be based on availability, supply chain requirements, and application-specific timing and power consumption constraints.

Frequently Asked Questions (FAQ)

Q: Can the NLV74AC74DR2G be used as a direct replacement for the SN74AC74NSR?

A: Functional substitution is possible based on matching logic family, flip-flop configuration, output type, trigger mechanism, and operating ranges. However, the NLV74AC74DR2G exhibits higher quiescent current (40 µA versus 2 µA) and longer propagation delay (12.5ns versus 10ns). Applications sensitive to power consumption or timing margins must evaluate these differences against design specifications.

Q: What are the package dimension differences between these parts?

A: Both parts use 14-SOIC packaging but with different body widths. The SN74AC74NSR measures 5.30mm in width, while the NLV74AC74DR2G measures 3.90mm. PCB footprint compatibility must be verified before substitution, as the narrower package may not align with existing land patterns designed for the wider variant.

Q: Are both parts RoHS compliant?

A: Yes, both the SN74AC74NSR and NLV74AC74DR2G are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements for electronic components.

Q: What is the significance of the product status difference?

A: The SN74AC74NSR maintains active product status, indicating ongoing production and manufacturer support. The NLV74AC74DR2G is listed as obsolete, meaning production has ended and future availability cannot be guaranteed. For long-term supply chain planning, the active part is preferred.

Q: Do both parts operate within the same voltage and temperature ranges?

A: Yes, both parts operate across identical supply voltage ranges (2V to 6V) and temperature ranges (-40°C to 85°C), ensuring compatibility in applications with these environmental specifications.