74ABT74D,112 Equivalent & Substitute Parts

Part Overview

The 74ABT74D,112 is a dual D-type flip-flop logic integrated circuit manufactured by Nexperia USA Inc. in a 14-SOIC surface mount package. This component features complementary outputs, positive edge triggering, and set/reset functionality. The part is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement.

Substiute Parts

74ABT74D,112

Nexperia USA Inc.In Stock: 86374ABT74D,112 Datasheet

Current PartRFQ

SN74LS74AD

Texas InstrumentsIn Stock: 2054SN74LS74AD Datasheet

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SN74LS74ANSR

Texas InstrumentsIn Stock: 2988SN74LS74ANSR Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 74ABT74D,112 are identified based on the following core compatibility criteria:

Functional Equivalence: All substitutes must be dual D-type flip-flops with complementary outputs, positive edge triggering, and set/reset functionality.

Package Compatibility: The 14-SOIC surface mount package is the primary mechanical constraint. Substitutes must fit the same PCB footprint and pin configuration.

Electrical Parameters: Substitutes must operate within overlapping voltage supply ranges and support the same logic family interface standards.

Output Characteristics: Current drive capability (output high and low currents) must be sufficient for the intended load.

The 74LS series parts listed below meet these criteria, though with reduced performance specifications compared to the 74ABT series.

Parameter Comparison

Engineering Selection Recommendations

SN74LS74AD: This part is functionally equivalent in logic operation and package footprint to the 74ABT74D,112. However, it is discontinued at DiGi Electronics, limiting long-term procurement availability. It operates within a narrower voltage supply range (4.75V ~ 5.25V) compared to the main part. Clock frequency is reduced to 33 MHz, and propagation delay is significantly higher at 40ns. Output current drive is substantially lower. This substitute is suitable only for legacy system maintenance where performance degradation is acceptable.

SN74LS74ANSR: This part maintains active product status from Texas Instruments, ensuring ongoing availability and supply chain continuity. It provides the same functional logic operation and pin configuration as the 74ABT74D,112. The package width differs (0.209" vs. 0.154"), which may require PCB footprint verification before implementation. Like the SN74LS74AD, this part operates at reduced performance levels (33 MHz clock frequency, 40ns propagation delay, lower output current). This substitute is recommended for new designs requiring long-term component availability, provided the package dimension change is accommodated in the PCB layout.

Both substitutes comply with ROHS3 and maintain the same moisture sensitivity level (MSL 1 - Unlimited).

Frequently Asked Questions (FAQ)

Q: Can the SN74LS74AD or SN74LS74ANSR directly replace the 74ABT74D,112 in existing designs?

A: Both parts are pin-compatible and functionally equivalent in logic operation. However, the 74LS series operates at significantly reduced clock frequencies (33 MHz vs. 250 MHz) and has higher propagation delays (40ns vs. 4.2ns). Designs operating at clock frequencies below 33 MHz will function correctly. Designs requiring the full 250 MHz performance of the 74ABT series cannot use these substitutes without redesign.

Q: What is the difference between SN74LS74AD and SN74LS74ANSR?

A: Both parts are electrically identical 74LS series flip-flops. The primary differences are product status (SN74LS74AD is discontinued; SN74LS74ANSR is active) and package dimensions. The SN74LS74ANSR has a wider package body (0.209" vs. 0.154"), which may affect PCB layout compatibility. For new designs, SN74LS74ANSR is preferred due to active availability.

Q: Are there performance trade-offs when using these substitutes?

A: Yes. The 74LS series has lower output current drive (400µA/8mA vs. 15mA/20mA), higher quiescent current consumption (8mA vs. 50µA), and significantly reduced clock frequency capability. These trade-offs are acceptable in low-speed logic applications but unsuitable for high-frequency or high-current-drive requirements.

Q: Do the substitutes meet the same compliance standards?

A: Yes. Both SN74LS74AD and SN74LS74ANSR are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity level, matching the compliance profile of the 74ABT74D,112.

Q: What is the voltage supply range compatibility?

A: The 74ABT74D,112 operates at 4.5V ~ 5.5V, while both 74LS substitutes operate at 4.75V ~ 5.25V. The 74LS range is narrower and does not extend to the lower 4.5V limit of the original part. Designs operating at voltages below 4.75V require the original 74ABT series or alternative high-performance logic families.