DM74ALS157N Equivalent & Substitute Parts

Part Overview

The DM74ALS157N is a 4 x 2:1 multiplexer logic integrated circuit manufactured by onsemi in a 16-DIP package. This component is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. The part operates with a single 4.5V to 5.5V supply and is suitable for applications requiring multiplexing functionality in digital logic circuits.

Substiute Parts

DM74ALS157N

onsemiIn Stock: 1196DM74ALS157N Datasheet

Current PartRFQ

SN74ALS157AN

Texas InstrumentsIn Stock: 1611SN74ALS157AN Datasheet

DirectRFQ

SN74ALS158N

Texas InstrumentsIn Stock: 2356SN74ALS158N Datasheet

Parametric EquivalentRFQ

SN74AS157N

Texas InstrumentsIn Stock: 2119SN74AS157N Datasheet

Parametric EquivalentRFQ

SN74AS158N

Texas InstrumentsIn Stock: 2065SN74AS158N Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the DM74ALS157N is determined by the following critical parameters:

• Circuit configuration: 4 x 2:1 multiplexer topology
• Electrical characteristics: 400µA output high current, 8mA output low current
• Supply voltage range: 4.5V ~ 5.5V single supply
• Operating temperature range: 0°C ~ 70°C
• Package type: 16-DIP (0.300", 7.62mm)
• Mounting method: Through Hole

Substitute parts are grouped into two categories based on series designation: 74ALS series (Advanced Low-power Schottky) and 74AS series (Advanced Schottky). Both series maintain identical electrical parameters and package specifications, ensuring functional compatibility in applications designed for the DM74ALS157N.

Parameter Comparison

Engineering Selection Recommendations

All substitute parts listed maintain identical electrical and mechanical specifications to the DM74ALS157N. Selection among available substitutes should be based on the following factors:

Product Status: The SN74ALS157AN, SN74ALS158N, SN74AS157N, and SN74AS158N are all active products from Texas Instruments, ensuring long-term availability and supply chain stability compared to the obsolete DM74ALS157N.

Compliance: All Texas Instruments substitutes are ROHS3 compliant, meeting current environmental and regulatory requirements. All parts maintain REACH Unaffected status and EAR99 export classification.

Series Selection: The 74ALS series (SN74ALS157AN, SN74ALS158N) represents Advanced Low-power Schottky technology, while the 74AS series (SN74AS157N, SN74AS158N) represents Advanced Schottky technology. Both series are electrically equivalent for the specified parameters.

Inventory Availability: Current stock levels are SN74ALS157AN (1547 pcs), SN74ALS158N (2330 pcs), SN74AS157N (2072 pcs), and SN74AS158N (1968 pcs).

Frequently Asked Questions (FAQ)

Q: Can SN74ALS158N be used as a direct replacement for DM74ALS157N?

A: Yes. The SN74ALS158N maintains identical electrical parameters (4 x 2:1 circuit configuration, 400µA/8mA output current, 4.5V-5.5V supply, 0°C-70°C operating range) and package specifications (16-DIP through-hole). The primary difference is the base product number designation (158 vs. 157), which reflects internal logic polarity differences that do not affect functional compatibility in applications designed for either variant.

Q: What is the difference between 74ALS and 74AS series substitutes?

A: Both 74ALS (Advanced Low-power Schottky) and 74AS (Advanced Schottky) series maintain identical electrical specifications for this multiplexer function. The series designation reflects different internal circuit technology. Selection between series should be based on availability and supply chain requirements, as electrical performance is equivalent.

Q: Are all substitute parts RoHS compliant?

A: All Texas Instruments substitute parts (SN74ALS157AN, SN74ALS158N, SN74AS157N, SN74AS158N) are ROHS3 compliant. The original DM74ALS157N RoHS status was not specified in available documentation.

Q: Can these parts be used in new designs?

A: Yes. All substitute parts are active products with confirmed current inventory. They are suitable for new design implementations and provide superior long-term availability compared to the obsolete DM74ALS157N.

Q: Are there any package or pinout differences?

A: No. All parts use identical 16-DIP (0.300", 7.62mm) through-hole packaging with the same pin configuration, ensuring direct mechanical and electrical compatibility on existing PCBs.