SN74LS279ADE4 Equivalent & Substitute Parts

Part Overview

The SN74LS279ADE4 is a quad S-R latch logic integrated circuit manufactured by Texas Instruments in the 74LS series. This device provides four independent 1:1 S-R latch circuits in a 16-SOIC surface mount package. The main part is currently in Last Time Buy status, making identification of equivalent substitute parts essential for ongoing design support and procurement planning.

Substiute Parts

SN74LS279ADE4

Texas InstrumentsIn Stock: 765SN74LS279ADE4 Datasheet

Current PartRFQ

SN74LS279ADR

Texas InstrumentsIn Stock: 5898SN74LS279ADR Datasheet

MFR RecommendedRFQ

SN74LS279AD

Texas InstrumentsIn Stock: 1047SN74LS279AD Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SN74LS279ADE4 are qualified based on strict equivalence across the following critical parameters:

• Logic Type: S-R Latch
• Independent Circuits: 4 channels
• Circuit Configuration: 1:1
• Output Type: Standard
• Voltage Supply Range: 4.75V ~ 5.25V
• Propagation Delay: 12ns
• Output Current Specifications: 400µA (high), 8mA (low)
• Operating Temperature Range: 0°C ~ 70°C
• Package / Case: 16-SOIC (0.154", 3.90mm Width)
• Mounting Type: Surface Mount
• Compliance: ROHS3 Compliant, REACH Unaffected

All substitute parts listed maintain identical electrical and mechanical specifications. Variations in packaging format (Tube vs. Cut Tape & Digi-Reel) and product status do not affect functional interchangeability in circuit applications.

Parameter Comparison

Engineering Selection Recommendations

The SN74LS279ADR is the primary recommended substitute for the SN74LS279ADE4. This part maintains full electrical and mechanical equivalence while offering Active product status, ensuring long-term availability and supply chain continuity. The SN74LS279ADR is available in Cut Tape and Digi-Reel packaging formats, providing flexibility for both prototype and production volume requirements.

The SN74LS279AD serves as a secondary substitute option. While functionally identical to the main part, it shares Last Time Buy status with the SN74LS279ADE4, limiting its utility for long-term design support. This part is available in Tube packaging.

Both substitute parts carry identical ROHS3 compliance and REACH Unaffected certifications, meeting regulatory requirements for commercial and industrial applications.

Frequently Asked Questions (FAQ)

Q: Can SN74LS279ADR be used as a direct replacement for SN74LS279ADE4 in existing designs?

A: Yes. The SN74LS279ADR is electrically and mechanically equivalent. All functional parameters, pin configurations, and electrical characteristics are identical. The only difference is packaging format (Cut Tape & Digi-Reel vs. Tube) and product status (Active vs. Last Time Buy).

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

A: Tube packaging is used for lower-volume orders and prototype applications. Cut Tape and Digi-Reel packaging is designed for automated assembly and higher-volume production runs. Both formats contain the same die and provide identical electrical performance.

Q: Why is the SN74LS279ADE4 in Last Time Buy status?

A: Last Time Buy status indicates that the manufacturer is discontinuing this specific part number variant. Customers should transition to active alternatives such as the SN74LS279ADR to ensure continued supply availability.

Q: Are there any thermal or environmental differences between these parts?

A: No. All three parts operate across the identical temperature range (0°C ~ 70°C) and carry the same Moisture Sensitivity Level (MSL 1 - Unlimited), indicating no special handling requirements.

Q: Can these parts be used interchangeably on the same PCB assembly?

A: Yes, provided the PCB design accommodates the specific packaging format. The 16-SOIC package dimensions are identical across all three parts. Verify that your assembly equipment and solder reflow profile are compatible with the selected packaging format.