SN74F157AD Equivalent & Substitute Parts

Part Overview

The SN74F157AD is a 4 x 2:1 multiplexer logic integrated circuit manufactured by Texas Instruments in a 16-SOIC surface mount package. This component is classified as Last Time Buy, indicating limited availability and the necessity to identify compatible alternatives for ongoing production and maintenance applications. The part operates with single supply voltage between 4.5V and 5.5V and is suitable for applications requiring multiplexing functionality across four independent 2:1 channels.

Substiute Parts

SN74F157AD

Texas InstrumentsIn Stock: 3162SN74F157AD Datasheet

Current PartRFQ

SN74F157ADR

Texas InstrumentsIn Stock: 2277SN74F157ADR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN74F157AD is determined by strict equivalence across the following critical parameters:

• 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 4.5V ~ 5.5V, output current ratings 1mA high / 20mA low
• Operating Temperature Range: 0°C ~ 70°C
• Compliance Standards: ROHS3 compliance, REACH unaffected status

Substitute parts must maintain identical electrical performance and physical compatibility to ensure direct replacement capability without circuit redesign or PCB modification.

Parameter Comparison

Engineering Selection Recommendations

The SN74F157ADR is the direct equivalent substitute for the SN74F157AD. Both parts are manufactured by Texas Instruments and maintain identical electrical and mechanical specifications across all critical parameters. The primary distinction is product status and packaging format: the SN74F157AD is Last Time Buy with tube packaging, while the SN74F157ADR is Active with tape and reel packaging.

For new designs and ongoing production requirements, the SN74F157ADR is the recommended selection due to its Active product status, ensuring continued availability and supply chain stability. Both parts satisfy ROHS3 compliance and REACH requirements, making either suitable for regulated applications.

Frequently Asked Questions (FAQ)

Q: Can the SN74F157ADR directly replace the SN74F157AD without circuit modification?

A: Yes. The SN74F157ADR is a direct functional and electrical equivalent. Both parts share identical circuit configuration (4 x 2:1 multiplexer), package type (16-SOIC), voltage specifications (4.5V ~ 5.5V), and output current ratings (1mA, 20mA). No circuit redesign or PCB layout changes are required.

Q: What is the difference between tube and tape & reel packaging?

A: Tube packaging (SN74F157AD) is used for lower-volume orders and manual handling, while tape and reel packaging (SN74F157ADR) is optimized for automated assembly processes and higher-volume production. The electrical and mechanical specifications of the components are identical; packaging format affects only handling and assembly methodology.

Q: Why is the SN74F157AD classified as Last Time Buy?

A: Last Time Buy status indicates that Texas Instruments has discontinued or is discontinuing production of this part number. Existing inventory is available for a limited time. The SN74F157ADR, with Active status, represents the current production equivalent and is recommended for future applications.

Q: Are both parts compliant with environmental and regulatory standards?

A: Yes. Both the SN74F157AD and SN74F157ADR are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements for electronic components in regulated markets.

Q: What is the moisture sensitivity level, and does it affect handling?

A: Both parts have Moisture Sensitivity Level (MSL) 1, classified as Unlimited. This indicates the components have no moisture sensitivity restrictions and do not require special dry storage or handling procedures during normal manufacturing and assembly operations.