SN74LS298DR Equivalent & Substitute Parts

Part Overview

The SN74LS298DR is a 4 x 2:1 multiplexer logic integrated circuit manufactured by Texas Instruments in 16-SOIC surface mount packaging. This component is classified as obsolete, indicating discontinued production and limited availability in the market. The identification of equivalent and substitute parts is necessary to ensure design continuity and maintain supply chain reliability for applications requiring 4 x 2:1 multiplexer functionality with identical electrical and mechanical specifications.

Substiute Parts

SN74LS298DR

Texas InstrumentsIn Stock: 912SN74LS298DR Datasheet

Current PartRFQ

SN74LS157DR

Texas InstrumentsIn Stock: 20929SN74LS157DR Datasheet

Parametric EquivalentRFQ

SN74LS158DR

Texas InstrumentsIn Stock: 3320SN74LS158DR Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SN74LS298DR are determined by strict equivalence across the following critical parameters:

• Circuit configuration: 4 x 2:1 multiplexer topology
• Independent circuits: 1
• Output current specifications: 400µA (high), 8mA (low)
• Supply voltage range: 4.75V ~ 5.25V
• Operating temperature range: 0°C ~ 70°C
• Package type: 16-SOIC surface mount
• Physical dimensions: 0.154" width, 3.90mm width
• Compliance certifications: ROHS3, REACH Unaffected

The substitute parts SN74LS157DR and SN74LS158DR meet all these electrical and mechanical requirements and are therefore classified as parametric equivalents suitable for direct replacement in applications requiring the SN74LS298DR.

Parameter Comparison

Engineering Selection Recommendations

The SN74LS298DR is obsolete and no longer in production. Both SN74LS157DR and SN74LS158DR are active products from Texas Instruments and provide identical electrical performance and mechanical compatibility.

Selection between the two active substitutes should be based on packaging availability and supply chain considerations:

• SN74LS157DR is available in Cut Tape (CT) & Digi-Reel® packaging with 20,833 units in stock
• SN74LS158DR is available in Tape & Reel (TR) packaging with 3,281 units in stock

Both parts maintain full compliance with ROHS3 and REACH requirements. The choice between these substitutes depends on procurement requirements and assembly process specifications rather than electrical or functional differences.

Frequently Asked Questions (FAQ)

Q: Can SN74LS157DR and SN74LS158DR be used interchangeably with SN74LS298DR?

A: Yes. Both parts are parametric equivalents with identical circuit configuration (4 x 2:1 multiplexer), output current specifications (400µA, 8mA), supply voltage range (4.75V ~ 5.25V), operating temperature range (0°C ~ 70°C), and 16-SOIC package dimensions. They are suitable for direct replacement.

Q: What is the difference between SN74LS157DR and SN74LS158DR?

A: The electrical and mechanical specifications are identical. The difference is in packaging format: SN74LS157DR uses Cut Tape (CT) & Digi-Reel® packaging, while SN74LS158DR uses Tape & Reel (TR) packaging. Selection depends on assembly process requirements and supply availability.

Q: Why is the SN74LS298DR obsolete?

A: The SN74LS298DR has been discontinued by Texas Instruments. The active substitute parts SN74LS157DR and SN74LS158DR provide equivalent functionality and are recommended for new designs and ongoing production.

Q: Are there any compliance differences between the main part and substitutes?

A: No. All three parts maintain identical ROHS3 compliance status, REACH Unaffected status, and Moisture Sensitivity Level (MSL) rating of 1 (Unlimited).

Q: What packaging considerations should be evaluated?

A: Both substitute parts use 16-SOIC surface mount packaging with identical physical dimensions (0.154" width, 3.90mm width). The primary consideration is the tape format: standard Tape & Reel (TR) or Cut Tape (CT) & Digi-Reel®, which should align with your assembly equipment specifications.