CD74AC02ME4 Equivalent & Substitute Parts

Part Overview

The CD74AC02ME4 is a NOR Gate IC featuring 4 channels with 2 inputs per channel in a 14-SOIC surface mount package, manufactured by Texas Instruments. This logic gate is designed for digital circuit applications requiring NOR gate functionality across a wide operating temperature range of -55°C to 125°C. The part is currently discontinued at DiGi Electronics, making equivalent substitute parts necessary for ongoing design requirements and production needs.

Substiute Parts

CD74AC02ME4

Texas InstrumentsIn Stock: 1026CD74AC02ME4 Datasheet

Current PartRFQ

CD74AC02M

Harris CorporationIn Stock: 2035CD74AC02M Datasheet

MFR RecommendedRFQ

MC74AC02DR2G

onsemiIn Stock: 4250MC74AC02DR2G Datasheet

DirectRFQ

MC74AC02DG

onsemiIn Stock: 4946MC74AC02DG Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the CD74AC02ME4 are qualified based on the following criteria:

Core Functional Parameters (Must Match):

• Logic Type: NOR Gate
• Number of Circuits: 4
• Number of Inputs: 2 per circuit
• Package / Case: 14-SOIC (0.154", 3.90mm Width)
• Mounting Type: Surface Mount
• Base Product Number: 74AC02 series

Electrical Compatibility Parameters (Must Be Within or Equal to Original Specifications):

• Voltage - Supply range must encompass or match the original range
• Current - Quiescent (Max) must not exceed original specification
• Current - Output High, Low must meet or exceed original specification
• Input Logic Level thresholds must be compatible with system design
• Max Propagation Delay must not exceed original specification for timing-critical applications

The three substitute parts listed below maintain functional equivalence through identical logic gate configuration and package form factor, with variations in manufacturer, product status, and operating temperature ranges.

Parameter Comparison

Engineering Selection Recommendations

CD74AC02M (Harris Corporation): This part maintains identical electrical specifications and operating temperature range to the original CD74AC02ME4. However, it carries obsolete product status and is RoHS non-compliant, making it unsuitable for new designs or applications requiring environmental compliance certification.

MC74AC02DR2G (onsemi): This part is actively manufactured and ROHS3 compliant. It provides superior propagation delay performance (6.5ns versus 11.5ns) and extended supply voltage range (2V ~ 6V). The operating temperature range is narrower (-40°C ~ 85°C) compared to the original part. This substitute is suitable for applications where the reduced temperature range is acceptable and where improved speed performance is beneficial. Supplied in Tape & Reel packaging.

MC74AC02DG (onsemi): This part is actively manufactured and ROHS3 compliant with identical electrical and performance characteristics to the MC74AC02DR2G. The primary difference is packaging format (Tube versus Tape & Reel). This substitute is suitable for applications where the reduced temperature range is acceptable and where improved speed performance is beneficial.

For applications requiring the full -55°C ~ 125°C operating temperature range, neither onsemi substitute is appropriate. For applications operating within -40°C ~ 85°C, the onsemi parts offer active product status, compliance certification, and improved performance characteristics.

Frequently Asked Questions (FAQ)

Q: Can MC74AC02DR2G or MC74AC02DG be used as direct replacements for CD74AC02ME4 in all applications?

A: Direct substitution depends on operating temperature requirements. The onsemi parts operate from -40°C to 85°C, while the original CD74AC02ME4 operates from -55°C to 125°C. If your application requires the full temperature range of the original part, these substitutes are not suitable. For applications within the -40°C to 85°C range, they are functionally equivalent.

Q: What is the difference between MC74AC02DR2G and MC74AC02DG?

A: Both parts are electrically and functionally identical. The difference is packaging format: MC74AC02DR2G is supplied in Tape & Reel (TR) format, while MC74AC02DG is supplied in Tube format. Select based on your procurement and assembly process requirements.

Q: Why does the onsemi part have faster propagation delay (6.5ns vs 11.5ns)?

A: The propagation delay specification reflects the maximum delay under specified conditions. The onsemi parts demonstrate faster switching characteristics, which may provide timing margin benefits in your circuit design but does not affect functional compatibility.

Q: Is CD74AC02M a viable substitute?

A: CD74AC02M maintains identical electrical specifications and temperature range to the original part. However, it is classified as obsolete and is RoHS non-compliant. It is not recommended for new designs or applications requiring environmental compliance documentation.

Q: Are there input logic level differences I should consider?

A: Yes. The original CD74AC02ME4 and CD74AC02M accept input low levels from 0.3V, while the onsemi parts require 0.9V minimum. Similarly, input high levels differ (1.2V minimum for original versus 2.1V for onsemi). Verify your circuit's signal levels are compatible with the selected substitute before implementation.

Q: What is the significance of ROHS3 compliance?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances regulations, restricting lead and other hazardous materials. This certification is required for many commercial and industrial applications. The original CD74AC02ME4 and onsemi substitutes are ROHS3 compliant; CD74AC02M is not.