74F151ASCX Equivalent & Substitute Parts

Part Overview

The 74F151ASCX is a 1 x 8:1 multiplexer logic integrated circuit manufactured by onsemi in a 16-SOIC surface mount package. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production support. The 74F151 series provides single-supply multiplexing functionality with standardized electrical characteristics across compatible variants.

Substiute Parts

74F151ASCX

onsemiIn Stock: 1518274F151ASCX Datasheet

Current PartRFQ

SN74F151BD

Texas InstrumentsIn Stock: 950SN74F151BD Datasheet

DirectRFQ

SN74F151BDR

Texas InstrumentsIn Stock: 5441SN74F151BDR Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 74F151ASCX is based on strict equivalence across the following parameters:

• Circuit configuration: 1 x 8:1 multiplexer topology
• Package: 16-SOIC surface mount form factor
• Supply voltage range: 4.5V ~ 5.5V
• Operating temperature: 0°C ~ 70°C
• Moisture sensitivity: MSL 1 (Unlimited)
• Series compatibility: 74F logic family

The substitute parts SN74F151BD and SN74F151BDR, both manufactured by Texas Instruments, meet all these criteria. Output current specifications (1mA high, 24mA low for TI variants versus 1mA high, 20mA low for the onsemi part) remain within acceptable operating margins for this logic family and do not prevent functional substitution.

Parameter Comparison

Engineering Selection Recommendations

For new designs and production applications, SN74F151BDR is the preferred substitute. This part carries Active product status from Texas Instruments, ensuring long-term availability and supply chain stability. It is ROHS3 compliant and supplied in Tape & Reel format, which is standard for automated assembly processes.

SN74F151BD remains a viable alternative where tube packaging is acceptable, though its Last Time Buy status indicates limited future availability. Both Texas Instruments variants are electrically and mechanically equivalent to the 74F151ASCX and support direct pin-for-pin replacement in 16-SOIC surface mount applications.

Frequently Asked Questions (FAQ)

Q: Can SN74F151BD and SN74F151BDR be used interchangeably with 74F151ASCX?

A: Yes. Both parts are functionally equivalent. The primary difference is packaging format: SN74F151BD is supplied in Tube, while SN74F151BDR is supplied in Tape & Reel. Selection depends on assembly requirements and inventory management practices.

Q: What is the significance of the output current difference (20mA vs. 24mA)?

A: The Texas Instruments variants specify 24mA output low current compared to 20mA for the onsemi part. This represents a minor specification variance within the 74F logic family and does not affect functional compatibility or circuit performance in standard applications.

Q: Why is 74F151ASCX marked as obsolete?

A: Obsolete status indicates the manufacturer (onsemi) has discontinued production. Substitute parts from active manufacturers ensure continued availability for maintenance, repair, and new production builds.

Q: Are there any compliance differences between these parts?

A: The Texas Instruments variants include ROHS3 compliance certification. The onsemi part does not specify RoHS status. All three parts are REACH Unaffected. For applications requiring RoHS compliance, SN74F151BD or SN74F151BDR are required.

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). Pin configuration and PCB footprint are identical, supporting direct board-level substitution.