SN74ALS157AD Equivalent & Substitute Parts

Part Overview

The SN74ALS157AD 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 Last Time Buy, indicating limited availability from the original manufacturer. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain flexibility, and support long-term production requirements for applications utilizing this multiplexer function.

Substiute Parts

SN74ALS157AD

Texas InstrumentsIn Stock: 2282SN74ALS157AD Datasheet

Current PartRFQ

SN74ALS157ADR

Texas InstrumentsIn Stock: 2775SN74ALS157ADR Datasheet

MFR RecommendedRFQ

SN74ALS158D

Texas InstrumentsIn Stock: 1110SN74ALS158D Datasheet

Parametric EquivalentRFQ

SN74AS157D

Texas InstrumentsIn Stock: 1199SN74AS157D Datasheet

Parametric EquivalentRFQ

SN74AS158D

Texas InstrumentsIn Stock: 780SN74AS158D Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN74ALS157AD is determined by strict equivalence across the following critical parameters:

• Circuit configuration: 4 x 2:1 multiplexer function
• Package type: 16-SOIC surface mount
• Electrical specifications: Voltage supply 4.5V ~ 5.5V, output current 400µA / 8mA
• Operating temperature range: 0°C ~ 70°C
• Compliance standards: ROHS3, REACH Unaffected, EAR99

Substitute parts are grouped by series designation (74ALS or 74AS) and base product number (74ALS157, 74ALS158, 74AS157, 74AS158). All identified substitutes maintain identical electrical and mechanical parameters within the allowed specifications for this product category.

Parameter Comparison

Engineering Selection Recommendations

Selection among equivalent parts should be based on the following criteria:

Primary Recommendation: SN74ALS157ADR This part maintains Active product status with the highest inventory availability (2686 pcs). It is electrically and mechanically identical to the SN74ALS157AD, with the primary difference being packaging format (Tape & Reel versus Tube). This part is suitable for high-volume production environments.

Secondary Recommendation: SN74ALS158D This part maintains Active product status and identical electrical specifications. The base product number differs (74ALS158 versus 74ALS157), but functional equivalence is confirmed through parametric matching. Inventory availability is 1093 pcs.

Tertiary Recommendation: SN74AS157D This part maintains Active product status with 1137 pcs inventory. The 74AS series represents a different logic family (Advanced Schottky versus Advanced Low-power Schottky), but electrical parameters remain within specification for direct substitution.

Not Recommended: SN74AS158D This part carries Obsolete product status, indicating discontinued manufacturing. While electrically equivalent, obsolescence status limits long-term supply reliability.

Frequently Asked Questions (FAQ)

Q: Can SN74ALS157ADR be used as a direct replacement for SN74ALS157AD? A: Yes. Both parts are electrically and mechanically identical. The difference is packaging format: SN74ALS157ADR is supplied in Tape & Reel format while SN74ALS157AD is supplied in Tube format. Both are suitable for surface mount assembly.

Q: What is the difference between 74ALS and 74AS series multiplexers? A: The 74ALS (Advanced Low-power Schottky) and 74AS (Advanced Schottky) are different logic families. However, the SN74ALS157AD and SN74AS157D maintain identical electrical parameters within the specified operating range, making them parametrically equivalent for this application.

Q: Why is SN74AS158D listed if it is Obsolete? A: SN74AS158D is included for reference purposes as a parametrically equivalent part. However, its Obsolete status means manufacturing has been discontinued. It should not be selected for new designs or long-term production requirements.

Q: Are there any pin-level differences between the substitute parts? A: No. All substitute parts maintain the 16-SOIC package with identical pin configuration and functional assignment.

Q: What is the significance of the packaging format difference (Tube vs. Tape & Reel)? A: Tube packaging is suitable for manual handling and lower-volume applications. Tape & Reel packaging is optimized for automated assembly equipment and high-volume production. The electrical and mechanical specifications are identical; packaging format selection depends on assembly process requirements.

Q: Are all substitute parts RoHS3 compliant? A: Yes. All identified substitute parts carry ROHS3 Compliant status and are REACH Unaffected, meeting current environmental and regulatory requirements.