74ACT158SCX Equivalent & Substitute Parts

Part Overview

The 74ACT158SCX 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 and substitute parts necessary for ongoing design support and procurement. The 74ACT158SCX operates with a single supply voltage of 4.5V to 5.5V and delivers 24mA output current at both high and low logic levels, suitable for standard TTL-compatible logic applications requiring multiplexing functionality.

Substiute Parts

74ACT158SCX

onsemiIn Stock: 239274ACT158SCX Datasheet

Current PartRFQ

MC74ACT157DR2G

onsemiIn Stock: 5604MC74ACT157DR2G Datasheet

Parametric EquivalentRFQ

MC74ACT257DR2G

onsemiIn Stock: 2766MC74ACT257DR2G Datasheet

Parametric EquivalentRFQ

CD74ACT158M96

Texas InstrumentsIn Stock: 2219CD74ACT158M96 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 74ACT158SCX are classified based on electrical and mechanical parameter alignment:

Parametric Equivalents maintain identical electrical specifications and package form factor:

• Same circuit configuration: 4 x 2:1 multiplexer
• Identical output current ratings: 24mA high and low
• Matching supply voltage range: 4.5V ~ 5.5V
• Same package: 16-SOIC (0.154", 3.90mm Width)
• Same mounting type: Surface Mount
• Moisture Sensitivity Level: 1 (Unlimited)

Similar Parts share the same base circuit function and package but may have extended operating temperature ranges or different product status classifications. These parts are functionally compatible within the specified electrical parameters.

Parameter Comparison

Engineering Selection Recommendations

MC74ACT157DR2G and MC74ACT257DR2G are parametric equivalents manufactured by onsemi with active product status. Both parts maintain identical electrical and mechanical specifications to the 74ACT158SCX and carry ROHS3 compliance certification. These parts are recommended as primary substitutes for new designs and ongoing procurement.

CD74ACT158M96 is manufactured by Texas Instruments and maintains electrical compatibility with the 74ACT158SCX. This part features an extended operating temperature range of -55°C to 125°C compared to the main part's -40°C to 85°C specification. CD74ACT158M96 carries ROHS3 compliance and active product status, making it suitable for applications requiring wider temperature operation within the same package and electrical parameters.

All substitute parts share identical package form factors, mounting types, and core electrical specifications, enabling direct functional replacement in circuit designs originally specified for the 74ACT158SCX.

Frequently Asked Questions (FAQ)

Q: Can MC74ACT157DR2G directly replace 74ACT158SCX in existing designs?

A: Yes. MC74ACT157DR2G maintains identical electrical specifications (4 x 2:1 multiplexer, 24mA output current, 4.5V ~ 5.5V supply) and package form factor (16-SOIC surface mount). The part is functionally compatible for direct substitution.

Q: What is the difference between MC74ACT157DR2G and MC74ACT257DR2G?

A: Both parts are parametric equivalents with identical electrical and mechanical specifications. The difference lies in base product numbering (74ACT157 versus 74ACT257), but they share the same circuit configuration, output current ratings, supply voltage, operating temperature range, and 16-SOIC package.

Q: Why does CD74ACT158M96 have a different operating temperature range?

A: CD74ACT158M96 is manufactured by Texas Instruments and is specified for -55°C to 125°C operation, compared to the 74ACT158SCX range of -40°C to 85°C. This extended range does not affect electrical compatibility; it indicates the part is qualified for wider environmental conditions. All other electrical and mechanical parameters remain identical.

Q: Are all substitute parts RoHS compliant?

A: MC74ACT157DR2G, MC74ACT257DR2G, and CD74ACT158M96 are all ROHS3 compliant. The original 74ACT158SCX RoHS status is not specified in the provided data.

Q: What packaging options are available for these multiplexer parts?

A: All listed parts are supplied in 16-SOIC (0.154", 3.90mm Width) surface mount packages. MC74ACT157DR2G and MC74ACT257DR2G are available in Tape & Reel (TR) packaging format.

Q: Can I use these parts interchangeably in high-temperature applications?

A: For applications requiring operation above 85°C, CD74ACT158M96 is specified to 125°C and is the appropriate selection. MC74ACT157DR2G and MC74ACT257DR2G are rated to 85°C maximum and should not be used in higher temperature environments.