SN74LS155ADRG4 Equivalent & Substitute Parts

Part Overview

The SN74LS155ADRG4 is a Decoder/Demultiplexer logic IC with 1 x 2:4 circuit configuration in a 16-SOIC surface mount package, manufactured by Texas Instruments. This part is discontinued at DiGi Electronics. Equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for production and repair applications.

Substiute Parts

SN74LS155ADRG4

Texas InstrumentsIn Stock: 1173SN74LS155ADRG4 Datasheet

Current PartRFQ

SN74LS155ADR

Texas InstrumentsIn Stock: 5970SN74LS155ADR Datasheet

MFR RecommendedRFQ

SN74LS139ADR

Texas InstrumentsIn Stock: 25097SN74LS139ADR Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the SN74LS155ADRG4 is determined by strict equivalence across the following critical parameters:

• Decoder/Demultiplexer type with 1 x 2:4 circuit configuration
• Two independent circuits
• 16-SOIC surface mount package (0.154", 3.90mm Width)
• Voltage supply range: 4.75V ~ 5.25V
• Output current specifications: 400µA (high), 8mA (low)
• Operating temperature range: 0°C ~ 70°C
• RoHS3 compliance and MSL Level 1 rating

Two substitute parts meet these criteria: SN74LS155ADR (manufacturer recommended) and SN74LS139ADR (parametric equivalent). Both are manufactured by Texas Instruments and maintain identical electrical and mechanical specifications required for direct substitution.

Parameter Comparison

Engineering Selection Recommendations

Both substitute parts are active products manufactured by Texas Instruments with identical electrical and mechanical specifications to the discontinued SN74LS155ADRG4.

SN74LS155ADR is the manufacturer-recommended substitute. It maintains the same base product number (74LS155) and is supplied in Tape & Reel packaging with 5918 units in stock.

SN74LS139ADR is a parametric equivalent with the same circuit functionality and package specifications. It uses base product number 74LS139 and is supplied in Cut Tape & Digi-Reel packaging with 24998 units in stock.

Both parts are ROHS3 compliant with MSL Level 1 rating and are suitable for direct substitution in applications requiring the SN74LS155ADRG4 specifications.

Frequently Asked Questions (FAQ)

Q: Can SN74LS155ADR and SN74LS139ADR be used interchangeably with SN74LS155ADRG4?

A: Yes. Both substitute parts meet all critical electrical and mechanical parameters: identical decoder/demultiplexer configuration (1 x 2:4), package type (16-SOIC), voltage supply range (4.75V ~ 5.25V), output current specifications (400µA, 8mA), and operating temperature range (0°C ~ 70°C).

Q: What is the difference between the two substitute parts?

A: SN74LS155ADR uses base product number 74LS155 and is supplied in Tape & Reel packaging. SN74LS139ADR uses base product number 74LS139 and is supplied in Cut Tape & Digi-Reel packaging. Both are parametrically equivalent with identical electrical specifications.

Q: Are both substitutes currently available?

A: Yes. SN74LS155ADR has 5918 units in stock, and SN74LS139ADR has 24998 units in stock as new original inventory.

Q: Do the substitutes maintain the same compliance certifications?

A: Yes. Both substitute parts are ROHS3 compliant with Moisture Sensitivity Level 1 (Unlimited) rating, matching the original part's compliance status.

Q: Is the 16-SOIC package identical across all three parts?

A: Yes. All three parts use the same 16-SOIC package with 0.154" width (3.90mm), ensuring mechanical compatibility in PCB layouts.