SN74ALS74AD Equivalent & Substitute Parts

Part Overview

The SN74ALS74AD 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, set/preset and reset capabilities, and positive edge triggering. The SN74ALS74AD is currently in Last Time Buy status, indicating discontinued production. Identifying equivalent substitute parts is necessary to maintain design continuity and ensure component availability for new production runs and legacy system support.

Substiute Parts

SN74ALS74AD

Texas InstrumentsIn Stock: 2060SN74ALS74AD Datasheet

Current PartRFQ

SN74ALS74ADR

Texas InstrumentsIn Stock: 3758SN74ALS74ADR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN74ALS74AD is determined by strict equivalence across the following critical parameters:

• Logic Function: Dual D-type flip-flop with 2 elements, 1 bit per element, complementary outputs, set/preset and reset capability
• Trigger Characteristic: Positive edge triggering
• Electrical Performance: Clock frequency of 34 MHz, propagation delay of 18 ns @ 5V with 50pF load, output drive capability of 400µA high and 8mA low
• Power Supply: 4.5V to 5.5V operating range with 4 mA quiescent current
• Package Specification: 14-SOIC surface mount package with 0.154" (3.90mm) width
• Environmental Compliance: ROHS3 compliance, MSL Level 1, REACH unaffected status

The substitute part SN74ALS74ADR maintains identical electrical and functional specifications while differing only in packaging format (Tape & Reel versus Tube) and product status (Active versus Last Time Buy).

Parameter Comparison

Engineering Selection Recommendations

The SN74ALS74ADR is the direct functional equivalent of the SN74ALS74AD. Both parts are manufactured by Texas Instruments and share identical electrical specifications, logic function, and package geometry. The primary distinction is product status: the SN74ALS74AD is Last Time Buy, while the SN74ALS74ADR maintains Active status with current manufacturing availability.

For new designs and production runs, the SN74ALS74ADR is the appropriate selection due to its active product status and ongoing availability. Both parts maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment. The packaging format difference (Tube versus Tape & Reel) reflects standard distribution practices and does not affect electrical or mechanical compatibility.

Frequently Asked Questions (FAQ)

Q: Can SN74ALS74ADR be used as a direct replacement for SN74ALS74AD?

A: Yes. The SN74ALS74ADR is electrically and functionally identical to the SN74ALS74AD. Both parts feature the same logic function, electrical performance, propagation delay, power supply requirements, and 14-SOIC package specification. The only differences are packaging format and product status.

Q: What is the difference between Tube and Tape & Reel packaging?

A: Tube packaging (SN74ALS74AD) is used for lower-volume orders and manual handling, while Tape & Reel packaging (SN74ALS74ADR) is designed for automated assembly processes. Both formats contain the same component in the same 14-SOIC package. The choice depends on production volume and assembly equipment capability.

Q: Why is the SN74ALS74AD marked as Last Time Buy?

A: Last Time Buy status indicates that Texas Instruments has discontinued production of this part number. The SN74ALS74ADR, with identical specifications and Active status, is the recommended alternative for continued component sourcing.

Q: Are there any electrical performance differences between these parts?

A: No. Both parts operate at 34 MHz clock frequency, deliver 18 ns maximum propagation delay at 5V with 50pF load, and maintain identical output drive characteristics (400µA high, 8mA low) and quiescent current (4 mA).

Q: Do both parts meet the same compliance standards?

A: Yes. Both the SN74ALS74AD and SN74ALS74ADR are ROHS3 compliant, carry MSL Level 1 (Unlimited), and maintain REACH unaffected status.