SN74AC74PW Equivalent & Substitute Parts

Part Overview

The SN74AC74PW is a dual D-type flip-flop logic integrated circuit manufactured by Texas Instruments in a 14-TSSOP surface mount package. This device provides two independent D-type flip-flops with Set and Reset functions, operating at a maximum clock frequency of 160 MHz. The part is currently discontinued at DiGi Electronics, making equivalent substitutes necessary for ongoing production and maintenance applications. Substitute parts must maintain functional equivalence across core electrical parameters and package specifications to ensure direct replacement capability.

Substiute Parts

SN74AC74PW

Texas InstrumentsIn Stock: 1291SN74AC74PW Datasheet

Current PartRFQ

SN74AC74PWR

Texas InstrumentsIn Stock: 5471SN74AC74PWR Datasheet

DirectRFQ

MC74AC74DTR2G

onsemiIn Stock: 4443MC74AC74DTR2G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SN74AC74PW are qualified based on the following criteria:

Functional Equivalence: All substitute parts must be dual D-type flip-flops with Set and Reset functions, positive edge triggering, and complementary outputs.

Package Compatibility: All substitutes must use the 14-TSSOP surface mount package with identical pin configuration and mechanical dimensions (0.173", 4.40mm Width).

Electrical Parameters: Substitutes must operate within the specified voltage supply range (2V to 6V), support the 160 MHz clock frequency specification, and maintain compatible propagation delay characteristics at 5V with 50pF load.

Environmental & Compliance: All substitutes must meet ROHS3 compliance, MSL Level 1 rating, and operate across the -40°C to 85°C temperature range.

Series Compatibility: All qualified substitutes belong to the 74AC logic series, ensuring functional and electrical compatibility.

Parameter Comparison

Engineering Selection Recommendations

SN74AC74PWR (Texas Instruments, Active Status): This direct substitute from Texas Instruments is the primary replacement for the discontinued SN74AC74PW. Both parts share identical electrical specifications with the exception of propagation delay, where the PWR variant demonstrates superior performance at 6ns versus 10ns. The PWR is available in Cut Tape and Digi-Reel packaging formats, providing flexibility for production volumes. Active product status ensures long-term availability and supply chain continuity. This part is recommended as the first-choice substitute.

MC74AC74DTR2G (onsemi, MFR Recommended): This onsemi-manufactured alternative provides functional equivalence with identical clock frequency and output current specifications. The part maintains ROHS3 compliance and MSL Level 1 rating. Minor parameter variations include quiescent current of 4 µA (versus 2 µA) and input capacitance of 4.5 pF (versus 3 pF), which remain within acceptable tolerances for most applications. Tape & Reel packaging supports high-volume production requirements. Active product status confirms ongoing manufacturer support.

Both substitutes maintain full electrical and mechanical compatibility with the original SN74AC74PW specification and are suitable for direct replacement in 14-TSSOP surface mount applications.

Frequently Asked Questions (FAQ)

Q: Can SN74AC74PWR be used as a direct replacement for SN74AC74PW?

A: Yes. Both parts are dual D-type flip-flops in 14-TSSOP packages with identical functional specifications, voltage supply ranges, operating temperatures, and output characteristics. The SN74AC74PWR is the active production equivalent from the same manufacturer.

Q: What is the difference between the packaging formats (Tube vs. Cut Tape vs. Tape & Reel)?

A: Tube packaging is used for lower-volume orders and manual assembly. Cut Tape and Digi-Reel are used for semi-automated and automated assembly processes. All three formats contain the same die and provide identical electrical performance. Selection depends on production volume and assembly equipment compatibility.

Q: Are there electrical differences between SN74AC74PWR and MC74AC74DTR2G?

A: Both parts meet the core 160 MHz clock frequency and 24mA output current specifications. The SN74AC74PWR has lower quiescent current (2 µA vs. 4 µA) and lower input capacitance (3 pF vs. 4.5 pF). These differences are minor and do not affect functional compatibility in standard applications.

Q: Do all substitutes meet the same compliance requirements?

A: Yes. All three parts are ROHS3 compliant, carry MSL Level 1 ratings, and operate across the -40°C to 85°C temperature range. Compliance certifications are identical across all variants.

Q: Which substitute should be selected for new designs?

A: SN74AC74PWR is recommended for new designs due to active product status from Texas Instruments, superior propagation delay performance, and established supply chain availability. MC74AC74DTR2G serves as a secondary option with equivalent functionality.

Q: Is the 14-TSSOP package pinout identical across all substitutes?

A: Yes. All substitutes use the 14-TSSOP package with identical pin configuration, mechanical dimensions (0.173", 4.40mm Width), and surface mount compatibility. No PCB layout modifications are required for substitution.