SN74LS74ANS Equivalent & Substitute Parts

Part Overview

The SN74LS74ANS 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 with positive edge triggering and is housed in a 14-SOIC surface mount package.

The SN74LS74ANS is currently discontinued at DiGi Electronics. Identifying equivalent substitute parts is necessary to maintain design continuity and ensure component availability for production, repair, and maintenance applications.

Substiute Parts

SN74LS74ANS

Texas InstrumentsIn Stock: 2113SN74LS74ANS Datasheet

Current PartRFQ

SN74LS74ANSR

Texas InstrumentsIn Stock: 2988SN74LS74ANSR Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SN74LS74ANS are determined by strict equivalence across the following critical parameters:

Functional Parameters: Type (D-Type Flip-Flop), number of elements (2), bits per element (1), output type (Complementary), function (Set/Reset), and trigger type (Positive Edge) must be identical.

Electrical Parameters: Clock frequency (33 MHz), propagation delay (40 ns @ 5V, 15pF), supply voltage range (4.75V ~ 5.25V), quiescent current (8 mA), and output current specifications (400µA, 8mA) must match exactly.

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

Compliance Parameters: RoHS3 compliance and MSL rating (1) must be maintained.

The SN74LS74ANSR meets all these criteria and qualifies as a direct substitute.

Parameter Comparison

Engineering Selection Recommendations

The SN74LS74ANSR is the direct substitute for the SN74LS74ANS. Both parts share identical electrical, functional, and physical specifications. The primary distinction is product status: the SN74LS74ANS is discontinued, while the SN74LS74ANSR maintains active status with current manufacturing and distribution.

Both parts maintain ROHS3 compliance and MSL rating 1, satisfying environmental and reliability requirements. The SN74LS74ANSR is available in Cut Tape (CT) and Digi-Reel® packaging formats, providing flexibility for different procurement and assembly workflows.

For new designs or component replenishment, the SN74LS74ANSR is the appropriate selection due to its active product status and assured long-term availability.

Frequently Asked Questions (FAQ)

Q: Can the SN74LS74ANSR be used as a direct replacement for the SN74LS74ANS?

A: Yes. The SN74LS74ANSR is electrically and functionally identical to the SN74LS74ANS. All electrical parameters, timing specifications, supply voltage requirements, and output characteristics are equivalent. Both devices use the same 14-SOIC package with identical pinout and mechanical dimensions.

Q: What is the difference between SN74LS74ANS and SN74LS74ANSR?

A: The primary difference is product status. The SN74LS74ANS is discontinued at DiGi Electronics, while the SN74LS74ANSR is an active product. The SN74LS74ANSR is available in Cut Tape (CT) and Digi-Reel® packaging. All technical specifications and performance characteristics are identical.

Q: Are there any package or pinout differences?

A: No. Both parts use the 14-SOIC (0.209", 5.30mm Width) surface mount package. Pinout, mechanical dimensions, and lead spacing are identical. Direct PCB substitution is possible without design modifications.

Q: Do both parts meet the same compliance standards?

A: Yes. Both the SN74LS74ANS and SN74LS74ANSR are ROHS3 compliant with MSL rating 1 (Unlimited). Both carry the same ECCN (EAR99) and HTSUS (8542.39.0001) classifications.

Q: What are the key electrical parameters that define substitution compatibility?

A: Substitution compatibility is determined by: D-Type flip-flop configuration (2 elements, 1 bit per element), complementary output type, positive edge triggering, 33 MHz clock frequency, 40 ns propagation delay at 5V with 15pF load, 4.75V to 5.25V supply voltage range, 8 mA quiescent current, and 400µA/8mA output current specifications.

Q: Can these parts be used in applications requiring higher operating temperatures?

A: No. Both parts are specified for 0°C to 70°C operating temperature range. Applications requiring extended temperature operation require alternative components with appropriate temperature ratings.