CD74AC02E-NG NOR Gate IC Equivalent & Substitute Parts

Part Overview

The CD74AC02E-NG is a 4-channel, 2-input NOR gate logic integrated circuit manufactured by Texas Instruments in 14-PDIP through-hole packaging. This component is classified as obsolete, which necessitates identification of equivalent and substitute parts for ongoing design support and procurement continuity. The CD74AC02E-NG operates across a supply voltage range of 1.5V to 5.5V and is suitable for digital logic applications requiring NOR gate functionality with specified propagation delay characteristics.

Substiute Parts

CD74AC02E-NG

Texas InstrumentsIn Stock: 949CD74AC02E-NG Datasheet

Current PartRFQ

CD74AC02M96

Texas InstrumentsIn Stock: 6034CD74AC02M96 Datasheet

MFR RecommendedRFQ

CD74AC02E

Harris CorporationIn Stock: 1543CD74AC02E Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the CD74AC02E-NG are identified based on strict electrical and mechanical parameter equivalence within the 74AC logic family. Substitution eligibility is determined by the following criteria:

Electrical Parameter Equivalence:

• Identical logic type (NOR Gate)
• Identical number of circuits (4 channels)
• Identical number of inputs per circuit (2 inputs)
• Matching supply voltage range (1.5V ~ 5.5V)
• Matching quiescent current specification (4 µA maximum)
• Matching output current ratings (24mA high and low)
• Matching input logic level thresholds
• Matching propagation delay characteristics (11.5ns @ 5V, 50pF)
• Matching operating temperature range (-55°C ~ 125°C)

Mechanical Parameter Equivalence:

• Package type compatibility (through-hole or surface-mount variants of the same base product)
• Pin count and functional pin assignment alignment

Substitutes are grouped into two categories: MFR Recommended (active product status with modern compliance) and Parametric Equivalent (functionally identical but with different packaging or obsolescence status).

Parameter Comparison

Engineering Selection Recommendations

CD74AC02M96 (MFR Recommended Substitute): The CD74AC02M96 is the primary substitute for the CD74AC02E-NG. This part maintains complete electrical parameter equivalence while offering active product status and ROHS3 compliance. The CD74AC02M96 is packaged in 14-SOIC surface-mount format, requiring PCB design modification from through-hole to surface-mount assembly. This substitute is suitable for new designs and production environments with surface-mount assembly capability. Inventory availability is significantly higher (5933 units) compared to the main part.

CD74AC02E (Parametric Equivalent Substitute): The CD74AC02E manufactured by Harris Corporation provides parametric equivalence with identical electrical specifications and through-hole 14-DIP packaging, eliminating the need for PCB redesign. However, this part carries obsolete product status and RoHS non-compliance, making it suitable only for legacy system maintenance or applications where RoHS compliance is not required. Inventory availability (1465 units) is lower than the MFR recommended substitute but higher than the main part.

Selection Criteria:

• For new designs or RoHS-compliant applications: CD74AC02M96
• For through-hole assembly requirement with legacy system support: CD74AC02E
• For immediate through-hole replacement without compliance constraints: CD74AC02E

Frequently Asked Questions (FAQ)

Q: Can the CD74AC02M96 be used as a direct replacement for the CD74AC02E-NG in existing through-hole PCB designs?

A: No. The CD74AC02M96 uses 14-SOIC surface-mount packaging while the CD74AC02E-NG uses 14-DIP through-hole packaging. Although electrical parameters are identical, PCB layout and assembly process modifications are required. For direct through-hole replacement without PCB redesign, use the CD74AC02E.

Q: What is the difference between the MFR Recommended and Parametric Equivalent substitutes?

A: The CD74AC02M96 (MFR Recommended) is an active product with ROHS3 compliance and surface-mount packaging. The CD74AC02E (Parametric Equivalent) is an obsolete product with RoHS non-compliance and through-hole packaging. Both maintain identical electrical specifications. The MFR Recommended substitute is preferred for new designs; the Parametric Equivalent is suitable for legacy system support.

Q: Are all three parts (CD74AC02E-NG, CD74AC02M96, CD74AC02E) functionally interchangeable from an electrical standpoint?

A: Yes. All three parts are electrically interchangeable within the 74AC logic family, with identical logic type, circuit count, input count, supply voltage range, quiescent current, output current, input logic levels, propagation delay, and operating temperature specifications. Differences exist only in packaging format, manufacturer, and product status.

Q: What is the significance of the product status difference between these parts?

A: Product status indicates availability and manufacturer support. Active status (CD74AC02M96) indicates ongoing production and manufacturer support. Obsolete status (CD74AC02E-NG and CD74AC02E) indicates discontinued production, with availability limited to existing inventory. For long-term supply chain planning, active products are preferred.

Q: Does the CD74AC02M96 require different circuit design considerations compared to the CD74AC02E-NG?

A: No. Circuit design and electrical operation are identical. The only difference is physical packaging and PCB assembly method. Through-hole designs require modification to surface-mount assembly techniques when using the CD74AC02M96.

Q: What does ROHS3 compliance mean for the CD74AC02M96?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting lead, cadmium, mercury, and other hazardous materials. This is required for many commercial and industrial applications. The CD74AC02E-NG is ROHS3 compliant; the CD74AC02E is not.