SN74ALS27ADRE4 Equivalent & Substitute Parts

Part Overview

The SN74ALS27ADRE4 is a NOR Gate IC featuring 3 channels with 3 inputs per channel in a 14-SOIC surface mount package, manufactured by Texas Instruments. This component is classified as discontinued at DiGi Electronics, making identification of compatible substitutes essential for ongoing design support and procurement planning. The part operates within the 74ALS logic family and meets ROHS3 compliance requirements.

Substiute Parts

SN74ALS27ADRE4

Texas InstrumentsIn Stock: 1087SN74ALS27ADRE4 Datasheet

Current PartRFQ

SN74ALS27ADR

Texas InstrumentsIn Stock: 964SN74ALS27ADR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SN74ALS27ADRE4 is determined by strict equivalence across the following critical parameters:

• Logic Type: NOR Gate configuration
• Number of Circuits: 3 channels
• Number of Inputs: 3 inputs per channel
• Voltage Supply Range: 4.5V ~ 5.5V
• Output Current Specifications: 400µA (high), 8mA (low)
• Input Logic Levels: 0.8V (low), 2V (high)
• Propagation Delay: 15ns @ 5V, 50pF
• Operating Temperature Range: 0°C ~ 70°C
• Package Type: 14-SOIC surface mount
• Compliance: ROHS3 Compliant

The SN74ALS27ADR qualifies as a direct substitute based on identical electrical and mechanical specifications. The primary distinction is packaging format and product status.

Parameter Comparison

Engineering Selection Recommendations

The SN74ALS27ADR is the manufacturer-recommended substitute for the discontinued SN74ALS27ADRE4. Both parts maintain identical electrical characteristics, logic functionality, and thermal operating parameters. The SN74ALS27ADR carries active product status, ensuring continued availability and supply chain stability. Both components satisfy ROHS3 compliance and carry MSL Level 1 moisture sensitivity ratings, indicating no special handling requirements during storage or assembly.

The distinction between the two parts is limited to packaging format: the main part is supplied in tube packaging, while the substitute is supplied in Tape & Reel format. This difference does not affect component functionality or performance in circuit applications. Selection between these parts should be based on procurement requirements and assembly process compatibility with available packaging formats.

Frequently Asked Questions (FAQ)

Q: Can the SN74ALS27ADR be used as a direct replacement for the SN74ALS27ADRE4?

A: Yes. Both parts are electrically and functionally identical. They share the same logic configuration (3-channel NOR gate with 3 inputs), voltage supply range (4.5V ~ 5.5V), output current specifications, propagation delay characteristics, and operating temperature range. The 14-SOIC package dimensions are identical, enabling direct PCB compatibility.

Q: What is the difference between the SN74ALS27ADRE4 and SN74ALS27ADR?

A: The primary difference is packaging format. The SN74ALS27ADRE4 is supplied in tube packaging, while the SN74ALS27ADR is supplied in Tape & Reel format. The SN74ALS27ADR also maintains active product status, whereas the SN74ALS27ADRE4 is discontinued. All electrical and mechanical specifications are identical.

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

A: No. Both the SN74ALS27ADRE4 and SN74ALS27ADR are ROHS3 compliant and carry identical moisture sensitivity ratings (MSL Level 1). Both parts are suitable for applications requiring regulatory compliance in the same manner.

Q: Does the Tape & Reel packaging of the SN74ALS27ADR affect circuit performance?

A: No. Packaging format does not affect electrical performance or functional characteristics. The choice between tube and Tape & Reel packaging is determined by assembly process requirements and procurement volume considerations.

Q: Why is the SN74ALS27ADRE4 discontinued?

A: Product discontinuation decisions are made by manufacturers based on market demand and product lifecycle management. The SN74ALS27ADR remains in active production and serves as the current equivalent for new designs and ongoing procurement.