SN74LS157DRG4 Equivalent & Substitute Parts

Part Overview

The SN74LS157DRG4 is a 4 x 2:1 multiplexer logic integrated circuit manufactured by Texas Instruments in the 74LS series. This part is classified as obsolete, which necessitates identification of active equivalent alternatives for new designs and ongoing production requirements. The SN74LS157DRG4 operates as a single multiplexer circuit with four independent 2:1 selection channels, suitable for digital signal routing applications requiring TTL-level logic compatibility.

Substiute Parts

SN74LS157DRG4

Texas InstrumentsIn Stock: 3773SN74LS157DRG4 Datasheet

Current PartRFQ

SN74LS157NSR

Texas InstrumentsIn Stock: 5142SN74LS157NSR Datasheet

MFR RecommendedRFQ

SN74LS157DR

Texas InstrumentsIn Stock: 20929SN74LS157DR Datasheet

Parametric EquivalentRFQ

SN74LS158DR

Texas InstrumentsIn Stock: 3320SN74LS158DR Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SN74LS157DRG4 is determined by the following critical parameters:

• Circuit configuration: 4 x 2:1 multiplexer topology
• Output current specifications: 400µA (high), 8mA (low)
• Supply voltage range: 4.75V ~ 5.25V
• Operating temperature: 0°C ~ 70°C
• Mounting type: Surface Mount
• RoHS3 compliance and REACH unaffected status
• Moisture sensitivity level: 1 (Unlimited)

Substitute parts are grouped into two categories based on product status and packaging configuration:

MFR Recommended Substitute: SN74LS157NSR (Active status, Tape & Reel packaging)

Parametric Equivalents: SN74LS157DR and SN74LS158DR (Active status, alternative packaging options)

All substitute parts maintain identical electrical specifications and functional equivalence to the main part number.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: SN74LS157NSR

The SN74LS157NSR is the manufacturer-recommended substitute for the obsolete SN74LS157DRG4. This part maintains active product status with Texas Instruments, ensuring long-term availability and supply chain stability. All electrical parameters, compliance certifications (ROHS3, REACH unaffected), and functional specifications are identical to the main part number. The primary distinction is packaging format (Tape & Reel versus Digi-Reel) and minor physical package width variation (0.209" versus 0.154"), which do not affect electrical performance or PCB footprint compatibility for standard 16-SOIC layouts.

Secondary Recommendations: SN74LS157DR and SN74LS158DR

Both SN74LS157DR and SN74LS158DR are parametric equivalents with active product status. The SN74LS157DR maintains identical base product numbering and package dimensions (0.154", 3.90mm Width) to the original part, differing only in packaging format (Cut Tape & Digi-Reel). The SN74LS158DR operates as a functional equivalent with identical electrical specifications but carries a different base product number (74LS158 versus 74LS157). All three substitute options provide equivalent performance for applications requiring 4 x 2:1 multiplexer functionality within the specified voltage, current, and temperature parameters.

Frequently Asked Questions (FAQ)

Q: Can SN74LS157NSR be used as a direct replacement for SN74LS157DRG4?

A: Yes. The SN74LS157NSR is electrically and functionally identical to the SN74LS157DRG4. Both parts share identical circuit configuration (4 x 2:1 multiplexer), output current specifications (400µA, 8mA), supply voltage range (4.75V ~ 5.25V), operating temperature (0°C ~ 70°C), and compliance certifications. The primary difference is packaging format and minor physical package width variation, which do not affect circuit performance or standard PCB assembly compatibility.

Q: What is the difference between SN74LS157DR and SN74LS158DR?

A: Both parts are parametric equivalents with identical electrical specifications and 4 x 2:1 multiplexer functionality. The primary distinction is the base product number designation (74LS157 versus 74LS158). Both maintain active product status, ROHS3 compliance, and identical output current, supply voltage, and operating temperature specifications. Selection between these parts should be based on packaging format availability and supply chain requirements rather than functional differences.

Q: Does package width variation between SN74LS157DRG4 (0.154") and SN74LS157NSR (0.209") affect PCB compatibility?

A: No. Both parts use the 16-SOIC package family with identical pin pitch and footprint spacing. The width variation reflects different manufacturing specifications within the SOIC standard but does not affect PCB layout, trace routing, or assembly compatibility. Standard 16-SOIC footprints accommodate both package widths.

Q: Are all substitute parts ROHS3 compliant and REACH unaffected?

A: Yes. All substitute parts listed (SN74LS157NSR, SN74LS157DR, SN74LS158DR) maintain ROHS3 compliance and REACH unaffected status, matching the environmental and regulatory compliance profile of the original SN74LS157DRG4.

Q: Which substitute part offers the best long-term availability?

A: The SN74LS157NSR is the manufacturer-recommended substitute with active product status and the highest inventory level (5058 Pcs), providing optimal long-term supply chain stability. The SN74LS157DR also maintains active status with substantial inventory (20833 Pcs), offering an alternative with identical package dimensions to the original part.