SN74LS157D Equivalent & Substitute Parts

Part Overview

The SN74LS157D is a 4 x 2:1 multiplexer logic integrated circuit manufactured by Texas Instruments in a 16-SOIC surface mount package. This component is classified as Last Time Buy, indicating limited future availability. Identifying equivalent and substitute parts ensures design continuity and supply chain reliability for applications requiring 4 x 2:1 multiplexing functionality with LS-series logic specifications.

Substiute Parts

SN74LS157D

Texas InstrumentsIn Stock: 5671SN74LS157D Datasheet

Current PartRFQ

SN74LS157DR

Texas InstrumentsIn Stock: 20929SN74LS157DR Datasheet

MFR RecommendedRFQ

SN74LS158D

Texas InstrumentsIn Stock: 2164SN74LS158D Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN74LS157D is determined by strict equivalence across the following critical parameters:

• Circuit configuration: 4 x 2:1 multiplexer topology
• Package type: 16-SOIC surface mount form factor
• Electrical specifications: Voltage supply range 4.75V ~ 5.25V, output current ratings 400µA (high) and 8mA (low)
• Operating temperature range: 0°C ~ 70°C
• Compliance certifications: ROHS3, REACH Unaffected, EAR99 classification

Two substitute parts meet these criteria:

1. SN74LS157DR - Manufacturer Recommended substitute with identical electrical and mechanical specifications, available in Cut Tape (CT) & Digi-Reel® packaging
2. SN74LS158D - Parametric equivalent with identical electrical and mechanical specifications, available in Tube packaging

Parameter Comparison

Engineering Selection Recommendations

SN74LS157DR is the preferred substitute for new designs and ongoing production. This part maintains Active product status, ensuring long-term availability and supply chain stability. The Cut Tape (CT) & Digi-Reel® packaging format supports automated assembly processes and reduces component handling costs. All electrical and mechanical specifications remain identical to the SN74LS157D, with full compliance to ROHS3, REACH, and EAR99 classifications.

SN74LS158D serves as an alternative substitute with identical parametric specifications. However, this part carries Last Time Buy status, similar to the original SN74LS157D. Selection of SN74LS158D should be limited to applications where Tube packaging is required or where existing inventory management protocols mandate this format. Long-term supply availability may be constrained.

Both substitutes are electrically and mechanically interchangeable with the SN74LS157D within the specified operating parameters.

Frequently Asked Questions (FAQ)

Q: Can SN74LS157DR be used as a direct replacement for SN74LS157D?

A: Yes. The SN74LS157DR is electrically and mechanically equivalent to the SN74LS157D. Both parts share identical circuit configuration (4 x 2:1 multiplexer), package type (16-SOIC), voltage supply range (4.75V ~ 5.25V), output current specifications (400µA, 8mA), and operating temperature range (0°C ~ 70°C). The primary difference is packaging format (Cut Tape & Digi-Reel® versus Tube) and product status (Active versus Last Time Buy).

Q: What is the difference between SN74LS157D and SN74LS158D?

A: Both parts are parametric equivalents with identical electrical and mechanical specifications. The distinction lies in the base product number designation (74LS157 versus 74LS158) and current product status. Both are 4 x 2:1 multiplexers in 16-SOIC packages with matching voltage, current, and temperature ratings. Both carry ROHS3 compliance and identical moisture sensitivity levels.

Q: Why is SN74LS157DR recommended over SN74LS158D?

A: SN74LS157DR maintains Active product status, indicating ongoing manufacturing and guaranteed long-term availability. SN74LS158D is classified as Last Time Buy, signaling limited future production. For applications requiring sustained component supply, SN74LS157DR provides superior supply chain reliability.

Q: Are there packaging considerations when substituting these parts?

A: Yes. The SN74LS157D and SN74LS158D are supplied in Tube packaging, while SN74LS157DR is available in Cut Tape (CT) & Digi-Reel® format. Tube packaging is suitable for manual assembly and lower-volume applications. Cut Tape & Digi-Reel® packaging supports automated pick-and-place assembly and is standard for high-volume production. Verify your assembly process compatibility before selection.

Q: Do all three parts meet the same compliance standards?

A: Yes. SN74LS157D, SN74LS157DR, and SN74LS158D are all ROHS3 Compliant, REACH Unaffected, and classified as EAR99 for export control purposes. Moisture Sensitivity Level is 1 (Unlimited) for all three parts, indicating no special moisture handling requirements during storage or assembly.