74AC20SCX NAND Gate IC Equivalent & Substitute Parts

Part Overview

The 74AC20SCX is a dual 4-input NAND gate logic IC manufactured by onsemi in a 14-SOIC surface mount package. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement. The 74AC20 series provides standard logic gating functionality suitable for digital circuit applications requiring NAND logic operations across two independent channels.

Substiute Parts

74AC20SCX

onsemiIn Stock: 1512774AC20SCX Datasheet

Current PartRFQ

MC74AC20DG

onsemiIn Stock: 4285MC74AC20DG Datasheet

SimilarRFQ

MC74AC20DR2G

onsemiIn Stock: 1353MC74AC20DR2G Datasheet

Parametric EquivalentRFQ

CD74AC20M

Harris CorporationIn Stock: 12879CD74AC20M Datasheet

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CD74AC20M96

Texas InstrumentsIn Stock: 8652CD74AC20M96 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 74AC20SCX is determined by the following criteria:

Primary Substitution Parameters:

• Logic type (NAND Gate)
• Number of circuits (2 channels)
• Number of inputs per circuit (4 inputs)
• Package type (14-SOIC)
• Mounting type (Surface Mount)

Secondary Compatibility Parameters:

• Voltage supply range overlap
• Output current capability (24mA minimum for both high and low states)
• Propagation delay performance
• Operating temperature range compatibility

Parts are grouped into two categories: Direct Equivalents (identical electrical specifications within the 2V–6V supply range) and Extended-Range Equivalents (broader voltage and temperature specifications supporting 1.5V–5.5V supply range and -55°C to 125°C operation).

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (2V–6V Supply, -40°C to 85°C Operation):

MC74AC20DG and MC74AC20DR2G are active product alternatives from onsemi with identical electrical performance to the obsolete 74AC20SCX. Both maintain the 2V–6V supply range and -40°C to 85°C operating temperature specification. MC74AC20DG is packaged in tube format, while MC74AC20DR2G is supplied in cut tape and Digi-Reel format. Both are ROHS3 compliant.

For Extended Operating Range (1.5V–5.5V Supply, -55°C to 125°C Operation):

CD74AC20M96 (Texas Instruments) is an active product offering broader voltage and temperature specifications. This part supports lower supply voltages (1.5V minimum) and extended temperature operation (-55°C to 125°C). Propagation delay increases to 12.2ns at 5V, 50pF. CD74AC20M96 is ROHS3 compliant and supplied in tape and reel packaging.

CD74AC20M (Harris Corporation) provides identical electrical specifications to CD74AC20M96 but is classified as obsolete and RoHS non-compliant, making it unsuitable for new designs requiring regulatory compliance.

Compliance Considerations:

All active substitute parts (MC74AC20DG, MC74AC20DR2G, CD74AC20M96) are ROHS3 compliant and REACH unaffected, supporting modern procurement and environmental requirements.

Frequently Asked Questions (FAQ)

Q: Can MC74AC20DG directly replace 74AC20SCX?

A: Yes. MC74AC20DG is functionally equivalent within the specified 2V–6V supply range and -40°C to 85°C operating temperature. Both parts are 14-SOIC surface mount packages with identical logic configuration (2 channels, 4 inputs per channel) and output current ratings (24mA). The primary difference is packaging format (tube vs. surface mount reel) and product status (active vs. obsolete).

Q: What is the difference between MC74AC20DR2G and MC74AC20DG?

A: Both parts are electrically identical. The difference is packaging: MC74AC20DR2G is supplied in cut tape and Digi-Reel format for automated assembly, while MC74AC20DG is supplied in tube packaging for manual handling. Selection depends on assembly process requirements.

Q: When should CD74AC20M96 be selected over MC74AC20DG?

A: CD74AC20M96 is selected when designs require operation below 2V supply voltage or above 85°C ambient temperature. CD74AC20M96 supports 1.5V–5.5V supply range and -55°C to 125°C operating temperature. The trade-off is increased propagation delay (12.2ns vs. 7ns at 5V, 50pF).

Q: Is CD74AC20M suitable for new designs?

A: No. CD74AC20M is obsolete and RoHS non-compliant. CD74AC20M96 (Texas Instruments) is the active equivalent with identical electrical specifications and modern compliance certifications.

Q: Are all substitute parts pin-compatible with 74AC20SCX?

A: Yes. All listed substitute parts use the 14-SOIC package with identical pinout and logic configuration, ensuring direct PCB compatibility without layout modifications.

Q: What packaging options are available for 74AC20 substitutes?

A: MC74AC20DG is available in tube packaging. MC74AC20DR2G is available in cut tape and Digi-Reel format. CD74AC20M96 is available in tape and reel format. Selection depends on assembly volume and automation requirements.