SN74AS158NSR Equivalent & Substitute Parts

Part Overview

The SN74AS158NSR is a 4 x 2:1 multiplexer logic integrated circuit manufactured by Texas Instruments in the 74AS series. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The SN74AS158NSR performs digital multiplexing functions in 16-SOIC surface mount packaging and operates within standard TTL voltage and temperature ranges.

Substiute Parts

SN74AS158NSR

Texas InstrumentsIn Stock: 5465SN74AS158NSR Datasheet

Current PartRFQ

SN74ALS157ANSR

Texas InstrumentsIn Stock: 4937SN74ALS157ANSR Datasheet

Parametric EquivalentRFQ

SN74ALS158NSR

Texas InstrumentsIn Stock: 3296SN74ALS158NSR Datasheet

Parametric EquivalentRFQ

SN74AS157NSR

Texas InstrumentsIn Stock: 2986SN74AS157NSR Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SN74AS158NSR are qualified based on the following critical parameters that determine functional and mechanical compatibility:

Electrical Parameters:

• Circuit configuration: 4 x 2:1 multiplexer topology
• Output current specifications: 400µA (high), 8mA (low)
• Supply voltage range: 4.5V ~ 5.5V
• Operating temperature range: 0°C ~ 70°C
• Single supply voltage source requirement

Mechanical Parameters:

• Package type: 16-SOIC (0.209", 5.30mm Width)
• Mounting type: Surface Mount
• Supplier device package: 16-SO

Compliance Parameters:

• RoHS3 compliance
• Moisture sensitivity level: 1 (Unlimited)
• REACH unaffected status

All substitute parts listed maintain identical electrical and mechanical specifications, ensuring direct functional replacement in existing circuit designs.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: SN74ALS158NSR

The SN74ALS158NSR is the direct functional equivalent of the SN74AS158NSR with active product status. Both parts share identical electrical specifications, package configuration, and compliance certifications. The SN74ALS158NSR is available in Tape & Reel packaging and maintains full ROHS3 compliance and unlimited moisture sensitivity rating.

Secondary Recommendation: SN74ALS157ANSR

The SN74ALS157ANSR provides equivalent functionality with active product status. This part differs only in base product number (74ALS157 versus 74ALS158) while maintaining all critical electrical and mechanical parameters. Tape & Reel packaging is available with identical compliance certifications.

Alternative Option: SN74AS157NSR

The SN74AS157NSR remains within the 74AS series family and maintains all specified electrical and mechanical parameters. Product status is listed as discontinued at DiGi Electronics. This part is suitable for applications where series consistency with the original SN74AS158NSR is preferred, subject to availability constraints.

Frequently Asked Questions (FAQ)

Q: Can SN74ALS158NSR directly replace SN74AS158NSR in existing designs?

A: Yes. Both parts maintain identical output current specifications (400µA, 8mA), supply voltage range (4.5V ~ 5.5V), operating temperature range (0°C ~ 70°C), and 16-SOIC package configuration. Electrical and mechanical compatibility is complete.

Q: What is the difference between SN74ALS158NSR and SN74ALS157ANSR?

A: Both parts are functionally equivalent 4 x 2:1 multiplexers with identical electrical specifications and package types. The difference lies in the base product number designation (158 versus 157). All critical parameters for substitution are identical.

Q: Why is the SN74AS158NSR marked as obsolete?

A: The SN74AS158NSR has reached end-of-life status with Texas Instruments. Active equivalent parts in the 74ALS series provide continued availability while maintaining full functional compatibility.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance certification and maintain unlimited moisture sensitivity level (MSL 1), matching the original SN74AS158NSR specifications.

Q: What packaging options are available for substitute parts?

A: SN74ALS158NSR and SN74ALS157ANSR are available in Tape & Reel (TR) packaging. SN74AS157NSR packaging information is not specified in available data. All parts use 16-SOIC surface mount package configuration.