SN74ALS08NS Equivalent & Substitute Parts

Part Overview

The SN74ALS08NS is a 4-channel AND gate logic IC manufactured by Texas Instruments in 14-SO surface mount packaging. This component is classified as Last Time Buy, indicating discontinued production with limited availability. The SN74ALS08NS serves as a fundamental logic gate in digital circuit design, requiring identification of functionally equivalent alternatives to ensure design continuity and supply chain reliability.

Substiute Parts

SN74ALS08NS

Texas InstrumentsIn Stock: 3027SN74ALS08NS Datasheet

Current PartRFQ

SN74ALS08NSR

Texas InstrumentsIn Stock: 3148SN74ALS08NSR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SN74ALS08NS is determined by the following critical parameters:

• Logic function: AND gate with 4 channels and 2 inputs per channel
• Supply voltage range: 4.5V ~ 5.5V
• Output current specifications: 400µA (high), 8mA (low)
• Propagation delay: 14ns @ 5V, 50pF
• Package type: 14-SOIC surface mount
• Compliance certifications: ROHS3, MSL Level 1

The SN74ALS08NSR qualifies as a direct substitute based on identical logic function, circuit count, input configuration, supply voltage, output current ratings, propagation delay, and package specifications. Both parts maintain the same electrical performance envelope and physical form factor required for PCB integration.

Parameter Comparison

Engineering Selection Recommendations

The SN74ALS08NSR is the manufacturer-recommended substitute for the SN74ALS08NS. Both parts are manufactured by Texas Instruments and maintain identical electrical specifications, logic function, and package form factor. The primary distinction is product status: the SN74ALS08NS is Last Time Buy with limited inventory, while the SN74ALS08NSR is Active with current production availability.

Both parts satisfy ROHS3 compliance and MSL Level 1 requirements. The packaging format difference (Tube versus Tape & Reel) does not affect electrical compatibility or PCB assembly integration. Selection between these parts should be based on supply chain availability and procurement requirements rather than technical performance criteria.

Frequently Asked Questions (FAQ)

Q: Can the SN74ALS08NSR directly replace the SN74ALS08NS in existing designs?

A: Yes. The SN74ALS08NSR is electrically and mechanically identical to the SN74ALS08NS. All electrical parameters, logic function, pin configuration, and package dimensions are equivalent. Direct substitution is supported without design modification.

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

A: Tube packaging is used for manual handling and small-quantity applications. Tape & Reel packaging is designed for automated pick-and-place assembly equipment. Both formats contain the same component with identical electrical specifications. Selection depends on assembly process requirements, not component performance.

Q: Why is the SN74ALS08NS marked as Last Time Buy?

A: Last Time Buy status indicates that Texas Instruments has discontinued production of this part number. Existing inventory is available for a limited time. The SN74ALS08NSR remains in active production and is the recommended alternative for new designs and replenishment orders.

Q: Are there any input logic level differences between these parts?

A: The provided specifications show minor variations in input logic level thresholds (SN74ALS08NS: 0.4V ~ 0.5V low, 2.5V high; SN74ALS08NSR: 0.8V low, 2V high). Both values fall within the standard TTL logic level operating range and do not affect functional compatibility in typical 5V digital circuits.

Q: What compliance certifications apply to both parts?

A: Both the SN74ALS08NS and SN74ALS08NSR are ROHS3 compliant and carry MSL Level 1 (Unlimited) moisture sensitivity rating. Both parts are REACH Unaffected and classified under ECCN EAR99 for export purposes.