74HCT74DB,112 Equivalent & Substitute Parts

Part Overview

The 74HCT74DB,112 is a dual D-type flip-flop logic integrated circuit manufactured by Nexperia USA Inc. in a 14-SSOP surface mount package. This device functions as a 2-element D-type flip-flop with complementary outputs, set/preset and reset capabilities, and positive edge triggering. The part is currently classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement.

Substiute Parts

74HCT74DB,112

Nexperia USA Inc.In Stock: 104074HCT74DB,112 Datasheet

Current PartRFQ

74HCT74PW,118

Nexperia USA Inc.In Stock: 410174HCT74PW,118 Datasheet

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MM74HCT74MTC

Fairchild SemiconductorIn Stock: 3607MM74HCT74MTC Datasheet

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MM74HCT74MTCX

Fairchild SemiconductorIn Stock: 7822MM74HCT74MTCX Datasheet

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SN74HCT74DBR

Texas InstrumentsIn Stock: 2120SN74HCT74DBR Datasheet

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SN74HCT74PW

Texas InstrumentsIn Stock: 3414SN74HCT74PW Datasheet

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SN74HCT74PWR

Texas InstrumentsIn Stock: 2210SN74HCT74PWR Datasheet

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SN74HCT74PWT

Texas InstrumentsIn Stock: 1916SN74HCT74PWT Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the 74HCT74DB,112 is determined by the following critical parameters:

Functional Equivalence: All substitute parts must be D-type flip-flops with 2 elements, 1 bit per element, complementary outputs, set/preset and reset functions, and positive edge triggering.

Electrical Compatibility: Supply voltage range (4.5V ~ 5.5V), output current capability (4mA minimum), and quiescent current must be compatible with the original design.

Package Compatibility: The original part uses 14-SSOP packaging. Substitutes in 14-TSSOP packaging are electrically equivalent but have different physical dimensions (0.173" vs 0.209" width). Substitutes in the same 14-SSOP package maintain identical footprint compatibility.

Performance Parameters: Clock frequency, propagation delay, and input capacitance determine timing performance. Substitutes with equal or superior specifications maintain design margin.

Temperature Range: The original part operates from -40°C to 125°C. Substitutes with -40°C to 85°C range are suitable for most applications but may not support the full extended temperature specification.

Compliance & Status: RoHS3 compliance and product status (active vs. discontinued) affect long-term availability and regulatory requirements.

Parameter Comparison

Engineering Selection Recommendations

Direct Footprint Replacement (14-SSOP Package): The SN74HCT74DBR from Texas Instruments maintains identical 14-SSOP packaging and is currently active. This part offers superior propagation delay performance (25ns vs. 44ns) and lower quiescent current (4 µA vs. 40 µA) while maintaining full electrical compatibility. RoHS3 compliance and active product status support long-term availability.

Package-Compatible Alternative (14-TSSOP): The 74HCT74PW,118 from Nexperia USA Inc. provides electrical equivalence with matching clock frequency (59 MHz) and propagation delay (44ns @ 4.5V). The 14-TSSOP package requires PCB layout modification but is currently active with RoHS3 compliance. This option maintains the original manufacturer's design lineage.

Performance-Enhanced Substitutes (14-TSSOP): Texas Instruments SN74HCT74PWR and SN74HCT74PW offer improved propagation delay (25ns @ 5.5V) and reduced quiescent current (4 µA). SN74HCT74PWR is currently active with standard cut tape packaging. Both parts require package footprint change but deliver superior timing performance.

Extended Temperature Consideration: The original 74HCT74DB,112 supports -40°C to 125°C operation. All substitute parts listed operate to -40°C to 85°C maximum. Applications requiring the full 125°C upper limit must retain the original part or identify alternative logic families.

Fairchild Alternatives: MM74HCT74MTC and MM74HCT74MTCX from Fairchild Semiconductor provide functional equivalence in 14-TSSOP packaging with active product status. These parts feature lower quiescent current (2 µA) and improved propagation delay (35ns @ 5V) but operate to 85°C maximum temperature.

Frequently Asked Questions (FAQ)

Q: Can I substitute the 74HCT74DB,112 with a 14-TSSOP packaged part on my existing PCB?

A: No. The 14-SSOP package (0.209" width) and 14-TSSOP package (0.173" width) have different physical dimensions and pin spacing. PCB layout modification is required. If direct footprint replacement is mandatory, use SN74HCT74DBR, which maintains the 14-SSOP package.

Q: What is the key difference between the Nexperia 74HCT74PW,118 and Texas Instruments SN74HCT74PWR?

A: Both are 14-TSSOP packaged D-type flip-flops with identical supply voltage and output current ratings. The SN74HCT74PWR offers superior propagation delay (25ns vs. 44ns @ 4.5V) and lower quiescent current (4 µA vs. 40 µA). Texas Instruments parts are currently active; Nexperia 74HCT74PW,118 is also active. Selection depends on timing margin requirements and preferred supplier.

Q: Why do the Fairchild MM74HCT74 parts show lower clock frequency (27 MHz vs. 59 MHz)?

A: Clock frequency specifications reflect maximum guaranteed operating frequency under specified conditions. The Fairchild parts deliver faster propagation delay (35ns) despite lower clock frequency rating, indicating different characterization methodologies. Both are functionally compatible for standard 74HCT74 applications.

Q: Is the 74HCT74DB,112 truly obsolete, or can I still source it?

A: The part is classified as obsolete by the manufacturer. While inventory may exist in distribution channels, long-term availability is not guaranteed. Active substitutes such as 74HCT74PW,118 or SN74HCT74PWR are recommended for new designs and ongoing procurement.

Q: Do all substitute parts meet RoHS3 compliance?

A: Nexperia and Texas Instruments parts listed are RoHS3 compliant. Fairchild Semiconductor MM74HCT74MTC and MM74HCT74MTCX do not specify RoHS status in the provided data. Verify compliance requirements with your procurement or quality department before selection.

Q: What is the impact of different quiescent current ratings (40 µA vs. 2-4 µA)?

A: Quiescent current affects standby power consumption. The original 74HCT74DB,112 at 40 µA draws significantly more standby power than Fairchild alternatives at 2 µA or Texas Instruments parts at 4 µA. For battery-powered or low-power applications, lower quiescent current substitutes reduce overall system power budget.

Q: Can I use these parts interchangeably in a design without re-qualification?

A: All listed parts are functionally equivalent D-type flip-flops with identical logic behavior, supply voltage range, and pin configuration. However, differences in propagation delay, quiescent current, and temperature range may affect timing margins and thermal performance. Review design specifications for timing-critical paths and temperature requirements before substitution.