SN74LS244NS Equivalent & Substitute Parts

Part Overview

The SN74LS244NS is a non-inverting buffer logic integrated circuit manufactured by Texas Instruments, designed for 2-element, 4-bit per element configurations with 3-state output capability. This component operates within the 74LS logic family and is classified as Last Time Buy, indicating discontinued production with limited remaining inventory. The identification of equivalent and substitute parts is necessary due to inventory constraints and the need for long-term component availability in production environments.

Substiute Parts

SN74LS244NS

Texas InstrumentsIn Stock: 2053SN74LS244NS Datasheet

Current PartRFQ

SN74LS244NSR

Texas InstrumentsIn Stock: 4226SN74LS244NSR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN74LS244NS is determined by strict equivalence across the following critical parameters:

• Logic type and function: Non-inverting buffer configuration
• Element and bit architecture: 2 elements with 4 bits per element
• Output characteristics: 3-state output capability
• Electrical specifications: Output current ratings (15mA high, 24mA low) and supply voltage range (4.75V ~ 5.25V)
• Package specification: 20-SOIC form factor with identical physical dimensions
• Operating temperature range: 0°C ~ 70°C
• Compliance certifications: ROHS3 compliance and MSL rating

The SN74LS244NSR qualifies as a direct substitute based on identical alignment across all these parameters. The primary distinction between the main part and substitute relates to packaging format and product status rather than electrical or functional characteristics.

Parameter Comparison

Engineering Selection Recommendations

The SN74LS244NSR is the manufacturer-recommended substitute for the SN74LS244NS. Both components maintain identical electrical and functional specifications, with full compatibility in circuit applications. The SN74LS244NSR carries Active product status, ensuring continued availability and supply chain reliability compared to the Last Time Buy status of the original part number.

Selection between these parts should be based on packaging requirements and inventory strategy. The SN74LS244NS in tube packaging is suitable for applications requiring bulk quantities in single packaging format. The SN74LS244NSR in Cut Tape and Digi-Reel format provides flexibility for automated assembly processes and mixed-quantity procurement.

Both parts maintain ROHS3 compliance and identical MSL ratings, confirming suitability for standard manufacturing and storage environments without additional handling requirements.

Frequently Asked Questions (FAQ)

Q: Can the SN74LS244NSR be used as a direct replacement for the SN74LS244NS in existing designs?

A: Yes. The SN74LS244NSR is electrically and functionally identical to the SN74LS244NS. All electrical parameters, output characteristics, and operating specifications are equivalent. No circuit modifications are required for substitution.

Q: What is the difference between tube and Cut Tape packaging formats?

A: Tube packaging contains components in a plastic tube suitable for manual handling and bulk storage. Cut Tape and Digi-Reel packaging provides components on continuous tape, optimized for automated pick-and-place assembly equipment. Both formats contain identical components with no functional differences.

Q: Why is the SN74LS244NS marked as Last Time Buy?

A: Last Time Buy status indicates that Texas Instruments has discontinued production of this specific part number. The SN74LS244NSR remains in Active production status, making it the recommended long-term alternative for new designs and ongoing production requirements.

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

A: No. Both the SN74LS244NS and SN74LS244NSR maintain identical ROHS3 compliance, MSL ratings, REACH status, and ECCN classifications. No additional certifications or compliance documentation is required when substituting between these parts.

Q: What are the critical parameters that must match for substitution?

A: Substitution requires matching of logic type (non-inverting buffer), element configuration (2 elements, 4 bits per element), output type (3-state), output current specifications (15mA/24mA), supply voltage range (4.75V ~ 5.25V), operating temperature range (0°C ~ 70°C), and package form factor (20-SOIC). All these parameters are identical between the SN74LS244NS and SN74LS244NSR.