SN74ALS02AD Equivalent & Substitute Parts

Part Overview

The SN74ALS02AD is a NOR Gate IC manufactured by Texas Instruments, featuring 4 channels with 2 inputs per channel in a 14-SOIC surface mount package. This component is classified as Last Time Buy, indicating discontinued production with limited availability. The SN74ALS02AD operates within the 74ALS logic family and is suitable for digital logic applications requiring NOR gate functionality. Identifying equivalent and substitute parts is essential due to inventory constraints and the product's end-of-life status.

Substiute Parts

SN74ALS02AD

Texas InstrumentsIn Stock: 1779SN74ALS02AD Datasheet

Current PartRFQ

SN74ALS02ADR

Texas InstrumentsIn Stock: 4236SN74ALS02ADR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SN74ALS02AD are determined by strict equivalence across the following critical parameters:

• Logic Type: NOR Gate (4 channels, 2 inputs per channel)
• Electrical Specifications: Voltage supply range (4.5V ~ 5.5V), output current ratings (400µA, 8mA), input logic levels (0.8V low, 2V high), and propagation delay (12ns @ 5V, 50pF)
• Package Type: 14-SOIC surface mount package with identical physical dimensions (0.154", 3.90mm width)
• Compliance: ROHS3 compliant, MSL Level 1, REACH unaffected status
• Series Compatibility: 74ALS logic family

The SN74ALS02ADR qualifies as a direct substitute based on identical electrical and mechanical specifications. The primary distinction is packaging format: the main part uses Tube packaging, while the substitute uses Tape & Reel (TR) packaging. Both parts share the same base product number (74ALS02) and are manufactured by Texas Instruments.

Parameter Comparison

Engineering Selection Recommendations

The SN74ALS02ADR is the manufacturer-recommended substitute for the SN74ALS02AD. Both parts are electrically and mechanically identical, with all functional parameters matching precisely. The SN74ALS02ADR maintains Active product status, ensuring continued availability and supply chain reliability compared to the Last Time Buy status of the main part.

Selection between these parts should be based on packaging requirements and procurement logistics. Tube packaging (SN74ALS02AD) is suitable for lower-volume applications or manual assembly processes, while Tape & Reel packaging (SN74ALS02ADR) is optimized for automated pick-and-place assembly and higher-volume production runs. Both parts satisfy identical compliance requirements: ROHS3 compliance, MSL Level 1, and REACH unaffected status.

Frequently Asked Questions (FAQ)

Q: Can the SN74ALS02ADR be used as a direct replacement for the SN74ALS02AD?

A: Yes. The SN74ALS02ADR is electrically and mechanically identical to the SN74ALS02AD. All electrical specifications, logic performance, and package dimensions are equivalent. The only difference is the packaging format (Tape & Reel versus Tube).

Q: What is the difference between Tube and Tape & Reel packaging?

A: Tube packaging contains individual components in a plastic tube, suitable for manual handling and lower-volume applications. Tape & Reel packaging places components on a continuous tape wound on a reel, designed for automated assembly equipment. Both formats contain the same component with identical electrical performance.

Q: Why is the SN74ALS02AD marked as Last Time Buy?

A: Last Time Buy status indicates that Texas Instruments has discontinued production of this part number. The SN74ALS02ADR, with Active status, represents the current production equivalent and should be used for new designs and ongoing procurement.

Q: Are there any compliance or certification differences between these parts?

A: No. Both the SN74ALS02AD and SN74ALS02ADR are ROHS3 compliant, carry MSL Level 1 rating, and are REACH unaffected. Compliance certifications are identical.

Q: What are the critical parameters for NOR gate substitution?

A: Critical parameters include logic type (4-channel NOR gate with 2 inputs), supply voltage range (4.5V ~ 5.5V), output current specifications (400µA high, 8mA low), input logic thresholds (0.8V low, 2V high), propagation delay (12ns @ 5V, 50pF), and package type (14-SOIC). All these parameters must match for functional equivalence.