74ACT157MTCX Equivalent & Substitute Parts

Part Overview

The 74ACT157MTCX is a 4 x 2:1 multiplexer logic integrated circuit manufactured by onsemi in a 16-TSSOP surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. The 74ACT157 series provides single-supply multiplexing functionality suitable for digital logic applications requiring data selection across multiple input channels.

Substiute Parts

74ACT157MTCX

onsemiIn Stock: 625874ACT157MTCX Datasheet

Current PartRFQ

MC74ACT157DTR2G

onsemiIn Stock: 37744MC74ACT157DTR2G Datasheet

DirectRFQ

74AHCT157PW,118

Nexperia USA Inc.In Stock: 108274AHCT157PW,118 Datasheet

SimilarRFQ

CD74ACT157PW

Texas InstrumentsIn Stock: 1799CD74ACT157PW Datasheet

SimilarRFQ

CD74ACT157PWR

Texas InstrumentsIn Stock: 913CD74ACT157PWR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 74ACT157MTCX is determined by the following critical parameters: identical circuit configuration (4 x 2:1 multiplexer), compatible package type (16-TSSOP surface mount), matching voltage supply range (4.5V ~ 5.5V), and equivalent or superior output current capability (24mA minimum). The substitute parts are grouped into two categories:

Direct Substitutes (Identical Electrical Specifications): Parts maintaining the same output current (24mA), voltage supply range, and circuit configuration as the original 74ACT157MTCX.

Similar Substitutes (Compatible with Design Considerations): Parts with the same circuit configuration and package but differing in output current capability or operating temperature range, requiring design verification for specific applications.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: MC74ACT157DTR2G (onsemi) is the direct equivalent substitute for the obsolete 74ACT157MTCX. This part maintains identical electrical specifications, the same manufacturer lineage, and is currently in active production status with high inventory availability (37,688 units). The Tape & Reel packaging is suitable for automated assembly processes.

Alternative for Extended Temperature Range: CD74ACT157PWR (Texas Instruments) provides identical output current and voltage specifications with an extended operating temperature range (-55°C ~ 125°C) compared to the original part (-40°C ~ 85°C). This part is active and RoHS3 compliant, making it suitable for applications requiring broader temperature performance.

Lower Current Alternative: 74AHCT157PW,118 (Nexperia USA Inc.) maintains the same circuit configuration and package but provides reduced output current (8mA versus 24mA). This part is suitable only for applications where the lower current capability is acceptable and where the extended upper operating temperature limit (125°C) provides design benefit.

All recommended substitutes are RoHS3 compliant and REACH unaffected, meeting modern regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can MC74ACT157DTR2G directly replace 74ACT157MTCX without circuit modification?

A: Yes. MC74ACT157DTR2G is a direct electrical equivalent with identical output current (24mA), voltage supply range (4.5V ~ 5.5V), and circuit configuration (4 x 2:1). The only difference is packaging format (Tape & Reel versus Tube) and active product status. No circuit modifications are required.

Q: What is the difference between 74ACT and 74AHCT series multiplexers?

A: The primary difference is output current capability. 74ACT series provides 24mA output current, while 74AHCT series provides 8mA. Both operate at the same voltage supply range (4.5V ~ 5.5V) and share identical circuit configurations. Selection depends on the current-driving requirements of the application.

Q: Is CD74ACT157PW suitable as a substitute despite being discontinued?

A: CD74ACT157PW is electrically identical to the original part and currently has 1,689 units in stock. However, as a discontinued part, long-term availability cannot be guaranteed. For new designs or production requiring sustained supply, MC74ACT157DTR2G or CD74ACT157PWR are preferred.

Q: Does the Tape & Reel packaging of MC74ACT157DTR2G affect compatibility?

A: No. Tape & Reel packaging is a supply format suitable for automated pick-and-place assembly. The physical component and electrical specifications remain identical to tube-packaged versions. Tape & Reel is standard for high-volume production.

Q: Can 74AHCT157PW,118 be used in applications designed for 74ACT157MTCX?

A: 74AHCT157PW,118 can be used only if the application does not require the full 24mA output current. The reduced output current (8mA) may limit fan-out capability or drive capability to downstream logic. Verify that 8mA output current is sufficient for your specific application before substitution.

Q: Are all recommended substitutes RoHS3 compliant?

A: Yes. MC74ACT157DTR2G, CD74ACT157PWR, CD74ACT157PW, and 74AHCT157PW,118 are all RoHS3 compliant and REACH unaffected, meeting current environmental and regulatory standards.