SN74LS280D Equivalent & Substitute Parts

Part Overview

The SN74LS280D is a 9-bit parity generator/checker logic IC manufactured by Texas Instruments in 14-SOIC surface mount packaging. This component is classified as obsolete, making equivalent or substitute parts necessary for new designs and production continuity. The part operates within a 4.75V to 5.25V supply voltage range and is designed for applications requiring parity generation and checking functions in digital logic circuits.

Substiute Parts

SN74LS280D

Texas InstrumentsIn Stock: 1286SN74LS280D Datasheet

Current PartRFQ

SN74LVC86ADR

Texas InstrumentsIn Stock: 3031SN74LVC86ADR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the SN74LS280D is based on the following criteria derived from the provided parameters:

Package Compatibility: Both the main part and substitute must use 14-SOIC surface mount packaging to ensure PCB layout compatibility without redesign.

Voltage Supply Range: The substitute must operate within or encompass the 4.75V to 5.25V supply voltage specification of the original part.

Output Current Capability: The substitute must meet or exceed the output current specifications (400µA high, 8mA low) to maintain signal integrity in the application circuit.

Mounting Type: Surface mount technology must be maintained for manufacturing consistency.

Compliance Standards: RoHS3 compliance and MSL rating must be equivalent or superior to ensure regulatory and environmental requirements are met.

The SN74LVC86ADR is identified as a substitute based on shared 14-SOIC packaging and surface mount configuration. However, functional differences exist between parity generation/checking logic and XOR gate logic, requiring circuit-level evaluation.

Parameter Comparison

Engineering Selection Recommendations

Product Status Consideration: The SN74LS280D is obsolete, while the SN74LVC86ADR is active. Active product status ensures ongoing availability, manufacturing support, and compliance with current industry standards.

Compliance Alignment: Both parts maintain ROHS3 compliance and MSL Level 1 rating, satisfying regulatory and environmental requirements without additional qualification.

Voltage Supply Incompatibility: The SN74LVC86ADR operates at 1.65V to 3.6V, which does not overlap with the SN74LS280D's 4.75V to 5.25V supply range. Direct substitution without circuit modification is not feasible based on voltage specifications.

Output Current Capability: The SN74LVC86ADR provides higher output current (24mA vs. 400µA/8mA), offering improved drive capability if voltage compatibility is resolved through circuit redesign.

Functional Differences: The SN74LS280D performs parity generation and checking on 9-bit data, while the SN74LVC86ADR is a 4-channel XOR gate. These are distinct logic functions requiring different circuit implementations.

Frequently Asked Questions (FAQ)

Q: Can the SN74LVC86ADR directly replace the SN74LS280D on an existing PCB?

A: No. While both parts share 14-SOIC packaging and surface mount configuration, the SN74LVC86ADR operates at 1.65V to 3.6V supply voltage, incompatible with the SN74LS280D's 4.75V to 5.25V requirement. Additionally, the functional logic differs between parity generation/checking and XOR gate operations.

Q: What is the primary reason for seeking a substitute for the SN74LS280D?

A: The SN74LS280D is classified as obsolete. Substitutes are necessary to ensure component availability for production, maintenance, and new design implementations.

Q: Are there compliance differences between the two parts?

A: No. Both the SN74LS280D and SN74LVC86ADR maintain ROHS3 compliance, MSL Level 1 rating, and equivalent regulatory status.

Q: How do the output current specifications compare?

A: The SN74LS280D provides 400µA output high and 8mA output low. The SN74LVC86ADR provides 24mA for both high and low outputs, offering higher drive capability.

Q: What is the operating temperature range difference?

A: The SN74LS280D operates from 0°C to 70°C, while the SN74LVC86ADR operates from -40°C to 125°C, providing a wider temperature range for extended environmental applications.