SN74AC14D Equivalent & Substitute Parts

Part Overview

The SN74AC14D is a 6-channel inverter IC with Schmitt trigger functionality in a 14-SOIC surface mount package, manufactured by Texas Instruments. This logic component is discontinued at DiGi Electronics but remains available through alternative sources. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain flexibility, and support ongoing production requirements for applications utilizing this inverter logic function.

Substiute Parts

SN74AC14D

Texas InstrumentsIn Stock: 235428SN74AC14D Datasheet

Current PartRFQ

SN74AC14DR

Texas InstrumentsIn Stock: 15757SN74AC14DR Datasheet

DirectRFQ

74AC14SCX

onsemiIn Stock: 885074AC14SCX Datasheet

DirectRFQ

MC74AC14DR2G

onsemiIn Stock: 20615MC74AC14DR2G Datasheet

MFR RecommendedRFQ

TC74AC14F(EL,F)

Toshiba Semiconductor and StorageIn Stock: 3757TC74AC14F(EL,F) Datasheet

MFR RecommendedRFQ

74AC14SC

onsemiIn Stock: 230274AC14SC Datasheet

Parametric EquivalentRFQ

MC74AC14DG

onsemiIn Stock: 1831MC74AC14DG Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SN74AC14D are classified based on strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

• Logic Type: Inverter with 6 channels
• Number of Inputs: 6
• Features: Schmitt Trigger functionality
• Voltage Supply Range: 2V ~ 6V (or compatible subset)
• Current Output: 24mA high and low
• Input Logic Levels: 0.5V ~ 1.1V (low), 2.2V ~ 3.9V (high)
• Propagation Delay: 10ns maximum @ 5V, 50pF load
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package Compatibility: 14-SOIC or equivalent footprint

Substitution Categories:

Direct Equivalents maintain identical electrical specifications and packaging. These parts are pin-for-pin compatible with no design modifications required.

Manufacturer Recommended Substitutes are designated by the original manufacturer as approved alternatives. These may have minor parameter variations (such as quiescent current) but remain functionally compatible within the specified operating range.

Parametric Equivalents meet all critical electrical parameters and package requirements but may differ in packaging format (tube vs. tape & reel) or have marginal variations in non-critical specifications.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (No Design Changes): SN74AC14DR is the primary recommendation. Manufactured by Texas Instruments with active product status, it maintains identical electrical specifications and footprint compatibility with the SN74AC14D. The only difference is packaging format (Cut Tape & Digi-Reel versus Tube), which does not affect circuit performance.

For Supply Chain Flexibility: 74AC14SCX (onsemi) and 74AC14SC (onsemi) are parametric equivalents with active status. Both maintain the 2 µA quiescent current specification and identical propagation delay. These parts are suitable for applications where supply continuity is prioritized.

For Applications with Relaxed Quiescent Current Requirements: MC74AC14DR2G and MC74AC14DG (onsemi) are manufacturer-recommended substitutes with 4 µA maximum quiescent current. These parts are appropriate for designs where the increased quiescent current does not impact system performance or power budget.

For Voltage-Constrained Applications: TC74AC14F(EL,F) (Toshiba) operates within 2V ~ 5.5V supply range, which is narrower than the standard 2V ~ 6V specification. This part is suitable only for applications operating within the 2V ~ 5.5V window. The package width differs (5.30mm versus 3.90mm), requiring PCB layout verification before implementation.

Compliance Considerations: All substitute parts maintain RoHS compliance. SN74AC14DR, 74AC14SCX, 74AC14SC, MC74AC14DR2G, and MC74AC14DG are ROHS3 compliant. TC74AC14F(EL,F) is RoHS compliant. All parts maintain MSL 1 (Unlimited) moisture sensitivity rating, ensuring compatibility with standard handling and storage procedures.

Frequently Asked Questions (FAQ)

Q: Can SN74AC14DR be used as a direct replacement for SN74AC14D? A: Yes. SN74AC14DR is electrically and functionally identical to SN74AC14D. The difference is packaging format: SN74AC14DR is supplied in Cut Tape & Digi-Reel format while SN74AC14D is supplied in Tube format. Both are pin-for-pin compatible with identical electrical performance.

Q: What is the difference between the onsemi 74AC14SCX and 74AC14SC parts? A: Both parts are parametric equivalents with identical electrical specifications. The difference is packaging: 74AC14SCX is supplied in Tape & Reel format, while 74AC14SC is supplied in Tube format. Selection depends on assembly process requirements.

Q: Can MC74AC14DR2G replace SN74AC14D in all applications? A: MC74AC14DR2G is a manufacturer-recommended substitute with one specification difference: quiescent current is 4 µA maximum versus 2 µA for the original part. This part is suitable for most applications. However, designs with strict power consumption requirements should evaluate whether the increased quiescent current is acceptable.

Q: Is TC74AC14F(EL,F) compatible with 6V supply voltage applications? A: No. TC74AC14F(EL,F) operates within 2V ~ 5.5V supply range. Applications requiring 6V operation must use alternative parts such as SN74AC14DR, 74AC14SCX, 74AC14SC, MC74AC14DR2G, or MC74AC14DG.

Q: Does the package width difference in TC74AC14F(EL,F) affect PCB compatibility? A: Yes. TC74AC14F(EL,F) has a package width of 5.30mm (14-SOP) compared to 3.90mm (14-SOIC) for other substitutes. PCB footprint and layout must be verified before implementation. This part is not suitable for designs with existing 14-SOIC footprints without layout modification.

Q: Are all substitute parts RoHS compliant? A: Yes. All listed substitute parts maintain RoHS compliance. SN74AC14DR, 74AC14SCX, 74AC14SC, MC74AC14DR2G, and MC74AC14DG are ROHS3 compliant. TC74AC14F(EL,F) is RoHS compliant. Both compliance levels are acceptable for standard applications.

Q: What is the propagation delay difference between TC74AC14F(EL,F) and other substitutes? A: TC74AC14F(EL,F) has a maximum propagation delay of 9.7ns at 5V with 50pF load, compared to 10ns for all other parts. This 0.3ns improvement is negligible for most applications and does not affect timing-critical circuit performance.

Q: Can these parts be used interchangeably in existing designs? A: Yes, with the following considerations: (1) Verify supply voltage range compatibility, particularly for TC74AC14F(EL,F) which is limited to 2V ~ 5.5V; (2) Confirm quiescent current specifications for power-sensitive applications; (3) Verify PCB footprint compatibility, particularly for TC74AC14F(EL,F) with its different package width; (4) Confirm packaging format compatibility with assembly equipment.