SN74LS157DRE4 Equivalent & Substitute Parts

Part Overview

The SN74LS157DRE4 is a 4 x 2:1 multiplexer logic integrated circuit manufactured by Texas Instruments in the 74LS series. This component is designed for digital signal routing and selection applications requiring single-supply operation. The part is currently discontinued at DiGi Electronics, making equivalent substitute parts necessary for ongoing production and maintenance applications. Substitute parts must maintain identical electrical characteristics and package specifications to ensure direct compatibility in existing designs.

Substiute Parts

SN74LS157DRE4

Texas InstrumentsIn Stock: 932SN74LS157DRE4 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 SN74LS157DRE4 are qualified based on the following critical parameters that determine functional and physical compatibility:

• Circuit Configuration: 4 x 2:1 multiplexer topology
• Package Type: 16-SOIC surface mount package with 0.154" (3.90mm) width
• Electrical Specifications: Single supply voltage range 4.75V ~ 5.25V, output current ratings 400µA (high) and 8mA (low)
• Operating Temperature: 0°C ~ 70°C range
• Compliance Standards: ROHS3 compliant, MSL Level 1

The substitute parts SN74LS157DR and SN74LS158DR meet all these critical parameters and are available from the same manufacturer in active production status.

Parameter Comparison

Engineering Selection Recommendations

Both SN74LS157DR and SN74LS158DR are direct functional equivalents to the SN74LS157DRE4 based on electrical and mechanical parameter alignment. Selection between these substitutes should be based on the following factors:

SN74LS157DR is the primary recommended substitute. It maintains the identical base product number (74LS157) and is available in Cut Tape and Digi-Reel packaging options with significantly higher inventory availability (20833 units). This part is in active production status and carries full ROHS3 compliance and MSL Level 1 certification.

SN74LS158DR is an alternative substitute with identical electrical specifications and package configuration. It is available in Tape & Reel packaging with active production status. The base product number differs (74LS158), but all critical electrical and thermal parameters remain equivalent. Inventory availability is lower (3281 units) compared to the SN74LS157DR.

Both substitutes are ROHS3 compliant and carry MSL Level 1 rating, ensuring compatibility with standard manufacturing and storage requirements. The choice between these two parts should be driven by packaging requirements and supply chain availability for your specific application.

Frequently Asked Questions (FAQ)

Q: Can SN74LS157DR and SN74LS158DR be used interchangeably with SN74LS157DRE4?

A: Yes. Both substitute parts maintain identical electrical specifications (voltage supply, output current, operating temperature), circuit configuration (4 x 2:1 multiplexer), and package type (16-SOIC surface mount). They are direct functional equivalents for circuit design purposes.

Q: What is the difference between SN74LS157DR and SN74LS158DR?

A: The primary difference is the base product number (74LS157 versus 74LS158) and packaging format. SN74LS157DR is available in Cut Tape and Digi-Reel options, while SN74LS158DR is supplied in Tape & Reel format. All electrical parameters, package dimensions, and compliance certifications are identical.

Q: Are there any package or pinout differences between these parts?

A: No. All three parts use the identical 16-SOIC package with 0.154" (3.90mm) width. Pinout and mechanical dimensions are equivalent, allowing direct board-level substitution without design modifications.

Q: What does the discontinuation of SN74LS157DRE4 mean for my application?

A: The discontinuation indicates the part is no longer manufactured or stocked at DiGi Electronics. Using SN74LS157DR or SN74LS158DR ensures access to active production inventory while maintaining full electrical and mechanical compatibility with existing designs.

Q: Do these substitute parts meet the same compliance standards?

A: Yes. All three parts are ROHS3 compliant and carry MSL Level 1 (Unlimited) moisture sensitivity rating. They meet identical environmental and regulatory requirements.

Q: Which substitute should I choose for new designs?

A: SN74LS157DR is recommended for new designs due to higher inventory availability and multiple packaging options. Both parts are in active production and carry identical electrical specifications, so either is suitable based on your packaging and supply requirements.