SN74LS08NS Equivalent & Substitute Parts

Part Overview

The SN74LS08NS is a 4-channel AND gate logic integrated circuit manufactured by Texas Instruments in the 74LS series. This component functions as a quad 2-input AND gate, providing four independent AND logic gates in a single 14-pin surface mount package. The SN74LS08NS is currently discontinued at DiGi Electronics, necessitating identification of functionally equivalent substitute components for ongoing design support and procurement requirements.

Substiute Parts

SN74LS08NS

Texas InstrumentsIn Stock: 5286SN74LS08NS Datasheet

Current PartRFQ

SN74LS08NSR

Texas InstrumentsIn Stock: 3207SN74LS08NSR Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN74LS08NS is determined by strict equivalence across the following critical parameters:

Logic Function: Both the main part and substitute must provide AND gate logic with identical circuit count (4 channels) and input configuration (2 inputs per gate).

Electrical Specifications: Supply voltage range, input logic levels, propagation delay, and output current ratings must match exactly to ensure functional compatibility in existing circuit designs.

Package Compatibility: The 14-SOIC surface mount package with 0.209" width and 5.30mm dimensions must be identical to maintain PCB layout compatibility.

Compliance Standards: RoHS3 compliance and MSL rating must be equivalent or superior to support manufacturing and environmental requirements.

Operational Range: Operating temperature range of 0°C ~ 70°C must be maintained for thermal compatibility.

The SN74LS08NSR qualifies as a direct substitute based on complete alignment with all specified parameters while offering active product status and improved availability.

Parameter Comparison

Engineering Selection Recommendations

The SN74LS08NSR is the direct equivalent substitute for the discontinued SN74LS08NS. Both components are manufactured by Texas Instruments and share identical electrical and mechanical specifications across all critical parameters.

Product Status Advantage: The SN74LS08NSR maintains active product status with current manufacturing support, whereas the SN74LS08NS is discontinued. This ensures long-term availability and supply chain continuity.

Compliance Alignment: Both parts maintain ROHS3 compliance and MSL Level 1 rating, supporting equivalent manufacturing processes and environmental standards.

Packaging Consideration: The SN74LS08NSR is supplied in Tape & Reel (TR) packaging, which is standard for high-volume production environments. The SN74LS08NS was supplied in standard packaging. Both use identical 14-SOIC package geometry, ensuring direct PCB compatibility without layout modifications.

Functional Equivalence: Complete parameter alignment across logic function, electrical specifications, and operating range confirms full functional interchangeability in circuit designs.

Frequently Asked Questions (FAQ)

Q: Can the SN74LS08NSR directly replace the SN74LS08NS without circuit modifications?

A: Yes. The SN74LS08NSR is a direct functional equivalent with identical electrical specifications, logic configuration, and package dimensions. No circuit modifications are required.

Q: What is the difference between the standard packaging and Tape & Reel (TR) packaging?

A: Both packaging types contain the same component in the same 14-SOIC package. Tape & Reel packaging is optimized for automated assembly processes and high-volume production. Standard packaging is used for lower-volume or manual assembly applications. The physical component and electrical performance are identical.

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

A: No. Both the SN74LS08NS and SN74LS08NSR maintain identical RoHS3 compliance status and MSL Level 1 rating. Environmental and manufacturing compliance requirements are equivalent.

Q: Why is the SN74LS08NS discontinued?

A: The SN74LS08NS has been discontinued at DiGi Electronics. The SN74LS08NSR remains in active production and is the recommended substitute for ongoing procurement.

Q: What are the key parameters that determine substitution eligibility?

A: Substitution is determined by: logic type (AND gate), circuit count (4 channels), input configuration (2 inputs), supply voltage range (4.75V ~ 5.25V), input logic levels (0.8V low, 2V high), propagation delay (20ns @ 5V, 15pF), operating temperature range (0°C ~ 70°C), and package geometry (14-SOIC, 0.209" width, 5.30mm).

Q: Is the propagation delay specification identical between both parts?

A: Yes. Both the SN74LS08NS and SN74LS08NSR specify a maximum propagation delay of 20ns at 5V with a 15pF load, ensuring equivalent timing performance in logic circuits.