SN74LS74ADE4 Equivalent & Substitute Parts

Part Overview

The SN74LS74ADE4 is a dual D-type flip-flop logic integrated circuit manufactured by Texas Instruments in the 74LS series. This component features two independent D-type flip-flops with set and reset functionality, complementary outputs, and positive edge triggering. The device is currently discontinued at DiGi Electronics, making equivalent substitute parts necessary for ongoing design support and production requirements.

Substiute Parts

SN74LS74ADE4

Texas InstrumentsIn Stock: 866SN74LS74ADE4 Datasheet

Current PartRFQ

SN74LS74ADR

Texas InstrumentsIn Stock: 2981SN74LS74ADR Datasheet

DirectRFQ

SN74LS74AD

Texas InstrumentsIn Stock: 2054SN74LS74AD Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN74LS74ADE4 is determined by strict equivalence across the following critical parameters:

• Functional equivalence: D-type flip-flop with 2 elements, 1 bit per element, complementary outputs, set/reset function, and positive edge triggering
• Electrical specifications: Clock frequency of 33 MHz, propagation delay of 40ns @ 5V with 15pF load, supply voltage range of 4.75V ~ 5.25V, output current ratings of 400µA (high) and 8mA (low), and quiescent current of 8 mA
• Operating conditions: Temperature range of 0°C ~ 70°C
• Package compatibility: 14-SOIC surface mount package with 0.154" (3.90mm) width
• Compliance standards: ROHS3 compliance, MSL Level 1, and REACH unaffected status

Substitute parts must match all electrical and mechanical parameters without exception. Packaging format (tube, cut tape, or reel) does not affect functional substitution but may impact procurement and handling.

Parameter Comparison

Engineering Selection Recommendations

SN74LS74ADR is the primary substitute for the SN74LS74ADE4. This part maintains active product status at the manufacturer, ensuring long-term availability and supply chain continuity. All electrical, functional, and mechanical specifications are identical to the original part. The packaging format (Cut Tape and Digi-Reel) supports both automated assembly and manual component handling. ROHS3 compliance and MSL Level 1 rating confirm environmental and moisture handling compatibility.

SN74LS74AD is the manufacturer-recommended alternative. This part carries identical electrical and functional specifications but is currently discontinued at DiGi Electronics. The tube packaging format is suitable for manual assembly operations. Selection of this part should account for potential future availability constraints.

Both substitute parts are fully compliant with ROHS3 and REACH requirements, matching the original part's regulatory status.

Frequently Asked Questions (FAQ)

Q: Can SN74LS74ADR replace SN74LS74ADE4 in existing designs?

A: Yes. The SN74LS74ADR is a direct functional and electrical equivalent. All timing parameters, voltage specifications, output characteristics, and operating temperature ranges are identical. The 14-SOIC surface mount package is mechanically compatible with existing PCB layouts.

Q: What is the difference between SN74LS74ADR and SN74LS74AD?

A: Both parts are electrically and functionally identical to the SN74LS74ADE4. The primary difference is packaging format: SN74LS74ADR is supplied in cut tape and Digi-Reel format for automated assembly, while SN74LS74AD is supplied in tube format for manual handling. Product status differs, with SN74LS74ADR currently active and SN74LS74AD discontinued at DiGi Electronics.

Q: Are there any pin configuration differences between these parts?

A: No. All three parts use the identical 14-pin SOIC package with the same pin assignments and functional pinout.

Q: Do these substitutes meet the same compliance requirements?

A: Yes. All substitute parts are ROHS3 compliant, carry MSL Level 1 rating, and are REACH unaffected, matching the original part's regulatory status.

Q: What is the maximum clock frequency for these parts?

A: The maximum clock frequency is 33 MHz for all parts in this substitution group.

Q: Can these parts operate at different supply voltages?

A: All parts in this group operate within the supply voltage range of 4.75V ~ 5.25V. Operation outside this range is not supported.