SN74LS27DRE4 Equivalent & Substitute Parts

Part Overview

The SN74LS27DRE4 is a NOR Gate IC featuring 3 channels with 3 inputs per channel, packaged in a 14-SOIC surface mount configuration. This component is classified as discontinued at DiGi Electronics, making identification of equivalent substitute parts essential for ongoing design support and procurement continuity. The SN74LS27 series remains widely available through alternative packaging and sourcing channels, enabling straightforward component replacement in existing designs.

Substiute Parts

SN74LS27DRE4

Texas InstrumentsIn Stock: 881SN74LS27DRE4 Datasheet

Current PartRFQ

SN74LS27DR

Texas InstrumentsIn Stock: 11629SN74LS27DR Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN74LS27DRE4 is determined by strict equivalence across the following critical parameters:

• Logic function: NOR Gate with identical 3-channel, 3-input configuration
• Electrical specifications: Voltage supply range, quiescent current, output current, input logic levels, and propagation delay
• Package type: 14-SOIC surface mount form factor
• Compliance certifications: ROHS3 compliance and MSL rating

The SN74LS27DR qualifies as a parametric equivalent substitute based on identical electrical characteristics and package specifications. The primary distinction is packaging format: the SN74LS27DR is supplied in Tape & Reel (TR) configuration, whereas the SN74LS27DRE4 uses standard packaging. Both parts share the same base product number (74LS27) and maintain full electrical and mechanical compatibility.

Parameter Comparison

Engineering Selection Recommendations

The SN74LS27DR is a direct substitute for the SN74LS27DRE4 based on identical electrical performance and mechanical compatibility. The SN74LS27DR maintains active product status with Texas Instruments, ensuring continued availability and supply chain stability. Both parts carry ROHS3 compliance and MSL Level 1 certification, meeting environmental and reliability requirements for industrial and commercial applications.

Selection of the SN74LS27DR is appropriate for new procurement, redesign efforts, or inventory replenishment where the original SN74LS27DRE4 is no longer available. The Tape & Reel packaging format of the SN74LS27DR is standard for high-volume manufacturing and automated assembly processes.

Frequently Asked Questions (FAQ)

Q: Can the SN74LS27DR be used as a direct replacement for the SN74LS27DRE4?

A: Yes. Both parts are electrically and mechanically identical. They share the same logic function, electrical specifications, operating temperature range, and 14-SOIC package footprint. The only difference is packaging format: Tape & Reel versus standard packaging.

Q: What is the difference between the SN74LS27DRE4 and SN74LS27DR?

A: The parts are functionally equivalent. The primary distinction is the packaging delivery method. The SN74LS27DRE4 uses standard packaging, while the SN74LS27DR is supplied in Tape & Reel format, which is typical for automated assembly and high-volume production environments.

Q: Are there any compatibility concerns when substituting the SN74LS27DR for the SN74LS27DRE4?

A: No compatibility concerns exist. Both parts operate within the same voltage supply range (4.75V ~ 5.25V), have identical input and output electrical characteristics, and use the same 14-SOIC surface mount package. PCB footprints and circuit behavior remain unchanged.

Q: Does the SN74LS27DR meet the same compliance standards as the SN74LS27DRE4?

A: Yes. Both parts are ROHS3 compliant and carry MSL Level 1 (Unlimited) moisture sensitivity rating, meeting the same environmental and reliability standards.

Q: Why is the SN74LS27DRE4 discontinued?

A: Product discontinuation at distribution channels does not indicate a design flaw or obsolescence of the underlying logic function. The SN74LS27 series remains in active production by Texas Instruments. The SN74LS27DR provides continued access to this proven NOR gate logic family.