SN74AS74ANS Equivalent & Substitute Parts

Part Overview

The SN74AS74ANS is a dual D-type flip-flop logic integrated circuit manufactured by Texas Instruments. This component functions as a 2-element D-type flip-flop with 1-bit per element, featuring complementary outputs and Set/Reset control. The device operates at a clock frequency of 105 MHz with a maximum propagation delay of 9 ns at 5V with 50 pF load.

The SN74AS74ANS carries a Last Time Buy product status, indicating that Texas Instruments has discontinued active production. This status necessitates identification of equivalent substitute parts to ensure continued design support and procurement availability for new applications and legacy system maintenance.

Substiute Parts

SN74AS74ANS

Texas InstrumentsIn Stock: 780SN74AS74ANS Datasheet

Current PartRFQ

SN74AS74ANSR

Texas InstrumentsIn Stock: 3713SN74AS74ANSR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN74AS74ANS is determined by strict equivalence across the following critical parameters:

Functional Parameters: Type (D-Type Flip-Flop), Number of Elements (2), Number of Bits per Element (1), Output Type (Complementary), Function (Set/Preset and Reset), and Trigger Type (Positive Edge) must remain identical.

Electrical Parameters: Clock Frequency (105 MHz), Maximum Propagation Delay (9 ns @ 5V, 50 pF), Voltage Supply Range (4.5V ~ 5.5V), Output Current specifications (2 mA high, 20 mA low), and Quiescent Current (16 mA) must match exactly.

Physical Parameters: Package Type (14-SOIC with 0.209" width, 5.30 mm) and Mounting Type (Surface Mount) must be identical.

Compliance Parameters: RoHS3 Compliance and Moisture Sensitivity Level (MSL 1) must be maintained.

The substitute part identified below meets all these criteria while differing only in packaging format (Tape & Reel versus tube) and product status (Active versus Last Time Buy).

Parameter Comparison

Engineering Selection Recommendations

SN74AS74ANSR is the direct functional and electrical equivalent of the SN74AS74ANS. Both parts share identical electrical specifications, functional characteristics, and physical package dimensions. The primary distinction is product status: SN74AS74ANS is designated Last Time Buy, while SN74AS74ANSR maintains Active status with Texas Instruments.

For new designs and ongoing procurement, SN74AS74ANSR is the appropriate selection. This part maintains full ROHS3 compliance and MSL 1 rating, ensuring compatibility with modern manufacturing processes and environmental standards. The Tape & Reel packaging format of SN74AS74ANSR is standard for high-volume automated assembly operations.

For legacy systems currently using SN74AS74ANS, direct substitution with SN74AS74ANSR requires no circuit modifications, PCB redesign, or functional validation beyond standard component verification procedures. Pin configuration, electrical performance, and thermal characteristics remain identical.

Frequently Asked Questions (FAQ)

Q: Can SN74AS74ANSR be used as a direct replacement for SN74AS74ANS in existing designs?

A: Yes. SN74AS74ANSR is electrically and functionally identical to SN74AS74ANS. Both devices feature the same D-type flip-flop architecture, 105 MHz clock frequency, 9 ns propagation delay, complementary outputs, and 14-SOIC package. No circuit modifications are required.

Q: What is the difference between SN74AS74ANS and SN74AS74ANSR?

A: The parts differ in packaging format and product status. SN74AS74ANS is supplied in tube packaging with Last Time Buy status. SN74AS74ANSR is supplied in Tape & Reel format and maintains Active product status. All electrical and functional specifications are identical.

Q: Why is SN74AS74ANS marked as Last Time Buy?

A: Last Time Buy designation indicates that Texas Instruments has discontinued active production of this part number. Existing inventory may be available for a limited period. SN74AS74ANSR, the Active equivalent, is recommended for new procurement.

Q: Are there any compatibility issues when switching from tube to Tape & Reel packaging?

A: No compatibility issues exist at the component level. The difference is purely in packaging format and handling. Tape & Reel packaging is optimized for automated assembly lines, while tube packaging is suitable for manual assembly or lower-volume applications. The actual integrated circuit is identical.

Q: Do both parts meet current RoHS and environmental compliance standards?

A: Yes. Both SN74AS74ANS and SN74AS74ANSR are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity rating, meeting current environmental and manufacturing standards.

Q: What is the base product number for these parts?

A: The base product number is 74AS74, which identifies the core D-type flip-flop architecture. The suffixes (ANS and ANSR) indicate packaging and distribution format variations.