74F157ASC Equivalent & Substitute Parts

Part Overview

The 74F157ASC is a 4 x 2:1 multiplexer logic integrated circuit manufactured by onsemi in a 16-SOIC surface mount package. This part is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The 74F157 series provides single-supply multiplexing functionality suitable for digital logic applications requiring channel selection and data routing.

Substiute Parts

74F157ASC

onsemiIn Stock: 238874F157ASC Datasheet

Current PartRFQ

SN74F157ADR

Texas InstrumentsIn Stock: 2277SN74F157ADR Datasheet

DirectRFQ

SN74F157AD

Texas InstrumentsIn Stock: 3162SN74F157AD Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 74F157ASC are qualified based on the following critical parameters that must remain identical:

• Circuit configuration: 4 x 2:1 multiplexer
• Package type: 16-SOIC with 0.154" width (3.90mm)
• Mounting type: Surface mount
• Voltage supply range: 4.5V ~ 5.5V
• Output current specifications: 1mA high, 20mA low
• Operating temperature range: 0°C ~ 70°C
• Series designation: 74F

Two substitute parts meet these electrical and mechanical requirements: the SN74F157ADR (Texas Instruments, Tape & Reel packaging) and the SN74F157AD (Texas Instruments, Tube packaging). Both are direct parametric equivalents sharing the identical base product number 74F157 and all specified electrical characteristics.

Parameter Comparison

Engineering Selection Recommendations

For applications currently using the 74F157ASC, the SN74F157ADR is the preferred substitute due to its active product status with Texas Instruments. This part maintains full electrical and mechanical compatibility while offering ongoing manufacturer support and availability.

The SN74F157AD represents an alternative with identical electrical specifications but carries a Last Time Buy status, indicating limited future availability. This part should be selected only when Tape & Reel packaging is not required or when tube packaging aligns with assembly processes.

Both Texas Instruments substitutes provide ROHS3 compliance, enhancing environmental and regulatory alignment compared to the obsolete onsemi part. All three parts share identical REACH and ECCN classifications, ensuring consistent regulatory treatment across supply chain transitions.

Frequently Asked Questions (FAQ)

Q: Can the SN74F157ADR directly replace the 74F157ASC on existing PCBs?

A: Yes. The SN74F157ADR is a direct pin-for-pin and functionally equivalent replacement. Both parts use the 16-SOIC package with identical pinout, electrical specifications, and operating parameters. No circuit modifications are required.

Q: What is the difference between SN74F157ADR and SN74F157AD?

A: The primary difference is packaging format. The SN74F157ADR is supplied in Tape & Reel (TR) format for automated assembly, while the SN74F157AD is supplied in Tube format for manual handling or lower-volume applications. Electrical specifications and pin configurations are identical.

Q: Why is the 74F157ASC obsolete?

A: The 74F157ASC is classified as obsolete by onsemi. Texas Instruments continues to manufacture equivalent parts under the SN74F157 designation, providing continuity for this multiplexer function.

Q: Are there any compliance differences between the substitute parts?

A: The Texas Instruments substitutes (SN74F157ADR and SN74F157AD) are ROHS3 compliant, while the original onsemi part does not specify RoHS status. All three parts are REACH Unaffected and share identical ECCN and HTSUS classifications.

Q: What packaging should I specify for new production orders?

A: For automated surface mount assembly, specify SN74F157ADR (Tape & Reel). For manual assembly or lower volumes, SN74F157AD (Tube) is appropriate. Both provide identical electrical performance.

Q: Is the operating temperature range identical across all three parts?

A: Yes. All three parts operate across the identical temperature range of 0°C to 70°C with matching output current specifications (1mA high, 20mA low) and supply voltage requirements (4.5V ~ 5.5V).