74ACT157SC Equivalent & Substitute Parts

Part Overview

The 74ACT157SC is a 4 x 2:1 multiplexer logic integrated circuit manufactured by onsemi in a 16-SOIC surface mount package. This component is classified as obsolete, which necessitates identification of equivalent and substitute parts for ongoing design support and procurement.

The 74ACT157SC operates with a single supply voltage of 4.5V to 5.5V and delivers 24mA output current capability in both high and low states. The device is suitable for applications requiring multiplexing functionality across four independent 2:1 channel selections.

Key Parameters

Parameter	Value
Part Number	74ACT157SC
Manufacturer	onsemi
Type	Multiplexer 4 x 2:1
Package	16-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Voltage Supply	4.5V ~ 5.5V
Output Current (High/Low)	24mA / 24mA
Operating Temperature	-40°C ~ 85°C
Product Status	Obsolete
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the 74ACT157SC is determined by strict equivalence across the following parameters:

Circuit configuration: 4 x 2:1 multiplexer topology
Package type: 16-SOIC surface mount form factor
Voltage supply range: 4.5V ~ 5.5V single supply
Output current capability: 24mA high and low
Independent circuits: 1
Mounting technology: Surface mount

Substitute parts are grouped into three categories based on product status and packaging configuration:

Direct Manufacturer Substitute (Active Status): MC74ACT157DR2G maintains identical electrical specifications and is supplied in Tape & Reel packaging by onsemi.

Parametric Equivalent (Active Status): MC74ACT157DG provides identical electrical performance with Tube packaging from onsemi.

Similar Alternatives (Varying Status): CD74ACT157M96 (Texas Instruments, Active) and CD74ACT157M (Harris Corporation, Obsolete) meet all core electrical and mechanical parameters but differ in operating temperature range and compliance certifications.

Parameter Comparison

Parameter	74ACT157SC	MC74ACT157DR2G	MC74ACT157DG	CD74ACT157M96	CD74ACT157M
Manufacturer	onsemi	onsemi	onsemi	Texas Instruments	Harris Corporation
Circuit Type	4 x 2:1 Multiplexer	4 x 2:1 Multiplexer	4 x 2:1 Multiplexer	4 x 2:1 Multiplexer	4 x 2:1 Multiplexer
Package	16-SOIC	16-SOIC	16-SOIC	16-SOIC	16-SOIC
Packaging Type	—	Tape & Reel (TR)	Tube	Tape & Reel (TR)	Tube
Voltage Supply	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V
Output Current (High/Low)	24mA / 24mA	24mA / 24mA	24mA / 24mA	24mA / 24mA	24mA / 24mA
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-55°C ~ 125°C	-55°C ~ 125°C
Product Status	Obsolete	Active	Active	Active	Obsolete
RoHS Compliance	—	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS Non-compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	—

Engineering Selection Recommendations

Primary Recommendation: MC74ACT157DR2G is the preferred substitute. It is manufactured by onsemi (original manufacturer), maintains active product status, achieves ROHS3 compliance, and is supplied in standard Tape & Reel packaging suitable for automated assembly processes.

Secondary Recommendation: MC74ACT157DG provides identical electrical and thermal specifications with active product status and ROHS3 compliance. Selection of this part is appropriate when Tube packaging meets procurement and assembly requirements.

Extended Temperature Alternative: CD74ACT157M96 (Texas Instruments) extends the operating temperature range to -55°C ~ 125°C while maintaining all core electrical parameters and ROHS3 compliance. This part is suitable for applications requiring enhanced temperature performance beyond the standard -40°C ~ 85°C range.

Legacy Consideration: CD74ACT157M (Harris Corporation) is obsolete and RoHS non-compliant. This part should not be selected for new designs or long-term procurement strategies.

Frequently Asked Questions (FAQ)

Q: Can MC74ACT157DR2G directly replace 74ACT157SC in existing designs?

A: Yes. Both parts share identical electrical specifications, voltage supply requirements, output current ratings, and operating temperature range. The primary difference is packaging format (Tape & Reel versus unspecified) and product status (Active versus Obsolete).

Q: What is the difference between MC74ACT157DR2G and MC74ACT157DG?

A: Both parts are manufactured by onsemi and provide identical electrical performance. The distinction is packaging: MC74ACT157DR2G is supplied in Tape & Reel format for high-volume automated assembly, while MC74ACT157DG is supplied in Tube format for lower-volume or manual assembly applications.

Q: Why does CD74ACT157M96 have a different operating temperature range?

A: CD74ACT157M96 is manufactured by Texas Instruments and is specified for -55°C ~ 125°C operation, compared to the standard -40°C ~ 85°C range of the onsemi parts. This extended range does not affect substitution compatibility for applications operating within the standard temperature window.

Q: Is the 16-SOIC package identical across all substitute parts?

A: Yes. All substitute parts use the 16-SOIC (0.154", 3.90mm Width) surface mount package. PCB footprints and assembly processes are compatible across all listed alternatives.

Q: Should CD74ACT157M be considered for new designs?

A: No. CD74ACT157M is obsolete and RoHS non-compliant. Active alternatives with superior compliance status are available.

Q: What does ROHS3 compliance mean for this component?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting the use of specific hazardous materials. This certification is relevant for applications subject to environmental and regulatory standards.

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