SN74LS02D NOR Gate IC Equivalent & Substitute Parts

Part Overview

The SN74LS02D is a 4-channel NOR gate logic IC manufactured by Texas Instruments in 14-SOIC surface mount packaging. This component implements four independent 2-input NOR logic functions in a single integrated circuit. The SN74LS02D is currently in Last Time Buy status, indicating discontinued production. Identifying qualified substitute parts is essential for design continuity, inventory management, and long-term product support.

Substiute Parts

SN74LS02D

Texas InstrumentsIn Stock: 3655SN74LS02D Datasheet

Current PartRFQ

SN74LS02DR

Texas InstrumentsIn Stock: 35274SN74LS02DR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN74LS02D is determined by strict equivalence across the following critical parameters:

• Logic Function: NOR gate with 4 channels and 2 inputs per channel
• Electrical Specifications: Supply voltage range (4.75V ~ 5.25V), output current ratings (400µA high, 16mA low), input logic thresholds (0.8V low, 2V high), and propagation delay (15ns @ 5V, 15pF)
• Package Compatibility: 14-SOIC surface mount package with identical physical dimensions (0.154", 3.90mm width)
• Operating Temperature Range: 0°C ~ 70°C
• Compliance Standards: ROHS3 compliance and MSL Level 1

The SN74LS02DR qualifies as a direct substitute based on identical electrical and mechanical parameters. The primary distinction is packaging format: the SN74LS02D is supplied in Tube packaging, while the SN74LS02DR is supplied in Tape & Reel (TR) format. Both parts share the same base product number (74LS02) and manufacturing series (74LS).

Parameter Comparison

Engineering Selection Recommendations

The SN74LS02DR is the qualified substitute for the SN74LS02D. Both parts are manufactured by Texas Instruments and maintain identical electrical performance, logic function, and package specifications. The SN74LS02DR carries Active product status, ensuring continued availability and manufacturing support, whereas the SN74LS02D is in Last Time Buy status.

Both parts meet ROHS3 compliance requirements and carry MSL Level 1 rating, indicating no moisture sensitivity constraints during storage and handling. Selection between these parts should be based on procurement requirements: the SN74LS02D in Tube packaging is suitable for lower-volume applications, while the SN74LS02DR in Tape & Reel format is optimized for automated assembly and higher-volume production environments.

Frequently Asked Questions (FAQ)

Q: Can the SN74LS02DR directly replace the SN74LS02D in existing designs?

A: Yes. The SN74LS02DR is electrically and mechanically equivalent to the SN74LS02D. Both parts implement identical NOR gate logic with the same pin configuration, electrical characteristics, and 14-SOIC package dimensions. The only difference is the packaging format (Tube versus Tape & Reel).

Q: What is the significance of the packaging format difference?

A: Tube packaging is used for manual handling and lower-volume applications. Tape & Reel packaging is designed for automated pick-and-place assembly equipment and high-volume production. The actual component specifications and performance are identical.

Q: Why is the SN74LS02D listed as Last Time Buy?

A: Last Time Buy status indicates that Texas Instruments has discontinued production of this part number. The SN74LS02DR, with Active status, represents the current production equivalent and should be used for new designs and long-term inventory planning.

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

A: No. Both the SN74LS02D and SN74LS02DR carry identical ROHS3 compliance and MSL Level 1 ratings. They meet the same environmental and regulatory standards.

Q: What are the critical parameters that define substitution eligibility?

A: Substitution is determined by matching logic function (4-channel NOR gate with 2 inputs), electrical specifications (supply voltage, output current, input thresholds, propagation delay), package type (14-SOIC), and operating temperature range (0°C ~ 70°C). All these parameters are identical between the SN74LS02D and SN74LS02DR.