74AC11074NSR Equivalent & Substitute Parts

Part Overview

The 74AC11074NSR is a dual D-type flip-flop logic integrated circuit manufactured by Texas Instruments, housed in a 14-SOIC surface mount package. This component functions as a 2-element D-type flip-flop with complementary outputs, positive edge triggering, and set/reset capability. The part is classified as obsolete, making identification of suitable substitutes essential for ongoing design support and production continuity.

Substiute Parts

74AC11074NSR

Texas InstrumentsIn Stock: 116274AC11074NSR Datasheet

Current PartRFQ

74ACT11074NSR

Texas InstrumentsIn Stock: 117274ACT11074NSR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 74AC11074NSR is determined by the following critical parameters:

Functional Parameters: The substitute must be a dual D-type flip-flop with complementary outputs, positive edge triggering, and set/reset functionality.

Electrical Parameters: Clock frequency, propagation delay, supply voltage range, output current capability, and quiescent current must meet or exceed the original specifications to ensure functional compatibility.

Package Parameters: The substitute must use the identical 14-SOIC (0.209", 5.30mm Width) surface mount package to ensure PCB compatibility without layout modifications.

Mechanical Parameters: Mounting type must remain surface mount with equivalent lead spacing and footprint dimensions.

The 74ACT11074NSR qualifies as a direct substitute based on matching functional architecture, compatible electrical performance within specified tolerances, and identical physical packaging.

Parameter Comparison

Engineering Selection Recommendations

The 74ACT11074NSR is a qualified substitute for the obsolete 74AC11074NSR based on functional equivalence and electrical compatibility. The substitute maintains identical logic architecture, output drive capability, and thermal operating range.

Product Status Consideration: The 74AC11074NSR is obsolete, while the 74ACT11074NSR maintains active production status, ensuring long-term availability and supply chain continuity.

Compliance Advantage: The 74ACT11074NSR is RoHS3 compliant, whereas the original part is RoHS non-compliant. This compliance status may be required for new designs or regulatory adherence in specific markets.

Electrical Trade-offs: The substitute exhibits a narrower supply voltage range (4.5V ~ 5.5V versus 3V ~ 5.5V) and slightly reduced clock frequency (125 MHz versus 150 MHz) with marginally increased propagation delay (8.5 ns versus 7.5 ns). These differences remain within acceptable operational margins for most applications operating at nominal 5V supply levels.

Package Compatibility: Both parts use identical 14-SOIC surface mount packaging, eliminating the need for PCB layout modifications or footprint adjustments.

Frequently Asked Questions (FAQ)

Q: Can the 74ACT11074NSR directly replace the 74AC11074NSR without PCB modifications?

A: Yes. Both parts use the 14-SOIC (0.209", 5.30mm Width) surface mount package with identical lead spacing and footprint dimensions. No PCB layout changes are required.

Q: What is the significance of the narrower supply voltage range in the 74ACT11074NSR?

A: The 74ACT11074NSR operates within 4.5V ~ 5.5V, compared to the original 3V ~ 5.5V range. For applications using nominal 5V supply levels, this difference is not operationally significant. Applications requiring operation below 4.5V must retain the original 74AC11074NSR or identify alternative solutions.

Q: How do the clock frequency and propagation delay differences affect circuit performance?

A: The 74ACT11074NSR operates at 125 MHz maximum clock frequency with 8.5 ns propagation delay, compared to 150 MHz and 7.5 ns for the original. These differences represent approximately 17% reduction in clock frequency and 13% increase in propagation delay. Circuits designed for the original specifications must confirm that the substitute meets timing requirements for the specific application.

Q: What is the advantage of the RoHS3 compliance status?

A: RoHS3 compliance indicates adherence to Restriction of Hazardous Substances regulations, required for products sold in certain markets and for organizations with environmental or regulatory compliance mandates. The original 74AC11074NSR is RoHS non-compliant.

Q: Is the 74ACT11074NSR available in alternative packaging options?

A: The provided data specifies the 14-SOIC package. Availability in alternative packages must be confirmed through the manufacturer or authorized distributors.

Q: What is the product status difference between the two parts?

A: The 74AC11074NSR is classified as obsolete, indicating discontinued production and potential supply limitations. The 74ACT11074NSR maintains active production status, ensuring ongoing availability and manufacturing support.