74AC157SCX Equivalent & Substitute Parts

Part Overview

The 74AC157SCX is a 4 x 2:1 multiplexer logic IC manufactured by onsemi in a 16-SOIC surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. The 74AC157SCX operates with a single supply voltage between 2V and 6V, delivering 24mA output current capability, and supports operating temperatures from -40°C to 85°C. Identifying compatible alternatives ensures design continuity and supply chain flexibility.

Key Parameters

Parameter	Specification
Part Number	74AC157SCX
Manufacturer	onsemi
Type	Multiplexer 4 x 2:1
Package	16-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Voltage Supply	2V ~ 6V
Output Current (High/Low)	24mA / 24mA
Operating Temperature	-40°C ~ 85°C
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the 74AC157SCX is determined by the following critical parameters: circuit configuration (4 x 2:1 multiplexer), package type (16-SOIC surface mount), voltage supply range compatibility, output current capability, and operating temperature range. Parts are grouped into three categories based on substitution relationship:

Direct Manufacturer Substitutes maintain identical electrical specifications and packaging from the same manufacturer (onsemi), differing only in product status or packaging format (Tape & Reel vs. tube).

Parametric Equivalents provide identical functional performance and electrical characteristics but may originate from different manufacturers or have different base product numbers within the same series.

Similar Parts share the same multiplexer function and package but operate under different electrical parameters (voltage range, output current, or temperature range), requiring engineering evaluation for specific applications.

Parameter Comparison

Part Number	Manufacturer	Type	Voltage Supply	Output Current (High/Low)	Operating Temperature	Package	Product Status	Packaging Format
74AC157SCX	onsemi	Multiplexer 4 x 2:1	2V ~ 6V	24mA / 24mA	-40°C ~ 85°C	16-SOIC	Obsolete	Standard
MC74AC157DR2G	onsemi	Multiplexer 4 x 2:1	2V ~ 6V	24mA / 24mA	-40°C ~ 85°C	16-SOIC	Active	Tape & Reel (TR)
MC74AC157DG	onsemi	Multiplexer 4 x 2:1	2V ~ 6V	24mA / 24mA	-40°C ~ 85°C	16-SOIC	Active	Tube
MC74AC257DR2G	onsemi	Multiplexer 4 x 2:1	2V ~ 6V	24mA / 24mA	-40°C ~ 85°C	16-SOIC	Active	Tape & Reel (TR)
NLV74AC157DR2G	onsemi	Multiplexer 4 x 2:1	2V ~ 6V	24mA / 24mA	-40°C ~ 85°C	16-SOIC	Obsolete	Tape & Reel (TR)
74AHC157D,118	Nexperia USA Inc.	Multiplexer 4 x 2:1	2V ~ 5.5V	8mA / 8mA	-40°C ~ 125°C	16-SOIC	Active	Tape & Reel (TR)
CD74AC157M	Harris Corporation	Multiplexer 4 x 2:1	1.5V ~ 5.5V	24mA / 24mA	-55°C ~ 125°C	16-SOIC	Active	Standard
CD74AC157M96	Texas Instruments	Multiplexer 4 x 2:1	1.5V ~ 5.5V	24mA / 24mA	-55°C ~ 125°C	16-SOIC	Active	Tape & Reel (TR)

Engineering Selection Recommendations

Primary Recommendation: MC74AC157DR2G

The MC74AC157DR2G is the optimal direct substitute for the 74AC157SCX. Both parts are manufactured by onsemi with identical electrical specifications (2V ~ 6V supply, 24mA output current, -40°C ~ 85°C operating range) and 16-SOIC packaging. The MC74AC157DR2G holds active product status and RoHS3 compliance, ensuring long-term availability and regulatory alignment. The only difference is packaging format (Tape & Reel vs. standard), which does not affect electrical performance.

Secondary Recommendation: MC74AC157DG

The MC74AC157DG provides identical electrical and functional performance to the 74AC157SCX with active product status. This variant differs only in packaging format (tube instead of standard), making it suitable for applications where tube packaging is acceptable or preferred.

Parametric Equivalent: MC74AC257DR2G

The MC74AC257DR2G maintains all critical electrical parameters (2V ~ 6V, 24mA output, -40°C ~ 85°C) and 16-SOIC packaging with active product status and RoHS3 compliance. The base product number differs (74AC257 vs. 74AC157), but functional equivalence is confirmed through identical circuit configuration and electrical specifications.

Alternative with Extended Temperature Range: CD74AC157M96

The CD74AC157M96 (Texas Instruments) and CD74AC157M (Harris Corporation) offer extended operating temperature range (-55°C ~ 125°C) and wider voltage supply compatibility (1.5V ~ 5.5V) while maintaining 24mA output current and 16-SOIC packaging. These parts are suitable for applications requiring broader environmental specifications.

Lower Current Alternative: 74AHC157D,118

The 74AHC157D,118 (Nexperia) is a similar part with reduced output current (8mA vs. 24mA) and extended temperature range (-40°C ~ 125°C). This part is appropriate only for applications where 8mA output current is sufficient and the narrower voltage range (2V ~ 5.5V) is compatible.

Frequently Asked Questions (FAQ)

Q: Can MC74AC157DR2G directly replace 74AC157SCX without circuit modifications?

A: Yes. The MC74AC157DR2G is a direct electrical and functional equivalent with identical voltage supply range (2V ~ 6V), output current (24mA), operating temperature (-40°C ~ 85°C), and 16-SOIC package. The only difference is packaging format (Tape & Reel), which does not affect circuit performance.

Q: What is the difference between MC74AC157DR2G and MC74AC257DR2G?

A: Both parts are parametric equivalents with identical electrical specifications and 16-SOIC packaging. The base product numbers differ (74AC157 vs. 74AC257), but this distinction does not affect functional performance in multiplexer applications. Both are manufactured by onsemi and hold active product status.

Q: Why does 74AHC157D,118 have lower output current (8mA vs. 24mA)?

A: The 74AHC157D,118 is from a different logic family (74AHC vs. 74AC) with different electrical characteristics. While it maintains the same 4 x 2:1 multiplexer function and 16-SOIC package, the reduced output current reflects the design specifications of the AHC family. This part is suitable only for applications where 8mA output current is adequate.

Q: Are CD74AC157M and CD74AC157M96 interchangeable?

A: Both parts share identical electrical specifications (1.5V ~ 5.5V, 24mA output, -55°C ~ 125°C) and 16-SOIC packaging. The primary difference is packaging format: CD74AC157M uses standard packaging while CD74AC157M96 uses Tape & Reel format. Selection depends on procurement and assembly requirements.

Q: Can I use NLV74AC157DR2G as a substitute despite its obsolete status?

A: The NLV74AC157DR2G is electrically equivalent to the 74AC157SCX with identical specifications and 16-SOIC packaging. However, its obsolete product status may limit future availability. Active alternatives such as MC74AC157DR2G or MC74AC157DG are recommended for new designs to ensure long-term supply chain stability.

Q: What is the voltage supply compatibility range for substitution?

A: The 74AC157SCX operates at 2V ~ 6V. Direct substitutes must support this range. The CD74AC157M and CD74AC157M96 offer a wider range (1.5V ~ 5.5V), which is compatible but does not extend above 6V. The 74AHC157D,118 operates at 2V ~ 5.5V, which is narrower and may not be suitable for applications requiring 5.5V ~ 6V operation.

Q: Does RoHS3 compliance affect substitution decisions?

A: RoHS3 compliance is a regulatory requirement for many applications. MC74AC157DR2G, MC74AC257DR2G, and 74AHC157D,118 are RoHS3 compliant, making them suitable for regulated markets. CD74AC157M and CD74AC157M96 do not list RoHS3 status in provided specifications and should be evaluated against specific regulatory requirements.

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