74ACT257MTCX Equivalent & Substitute Parts

Part Overview

The 74ACT257MTCX is a 4 x 2:1 multiplexer logic IC manufactured by onsemi in a 16-TSSOP surface mount package. This device is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The part operates with a single 4.5V to 5.5V supply and delivers 24mA output current capability across its four independent 2:1 multiplexer circuits.

Substiute Parts

74ACT257MTCX

onsemiIn Stock: 194074ACT257MTCX Datasheet

Current PartRFQ

MC74ACT157DTR2G

onsemiIn Stock: 37744MC74ACT157DTR2G Datasheet

Parametric EquivalentRFQ

74AHCT257PW,118

Nexperia USA Inc.In Stock: 333274AHCT257PW,118 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 74ACT257MTCX is determined by the following critical parameters:

• Circuit Configuration: 4 x 2:1 multiplexer topology
• Package Type: 16-TSSOP surface mount package
• Supply Voltage Range: 4.5V ~ 5.5V compatibility
• Output Current Capability: Minimum 24mA for both high and low states
• Operating Temperature Range: Support for -40°C ~ 85°C minimum
• Logic Family Compatibility: ACT or AHCT series logic families

Two substitute parts are identified:

Parametric Equivalent: MC74ACT157DTR2G (onsemi) — maintains identical electrical specifications and active product status within the same ACT logic family.

Similar Substitute: 74AHCT257PW,118 (Nexperia USA Inc.) — operates within the same voltage and package specifications but belongs to the AHCT logic family with reduced output current (8mA) and extended temperature range (-40°C ~ 125°C).

Parameter Comparison

Engineering Selection Recommendations

MC74ACT157DTR2G is the primary substitute for direct replacement. This part maintains identical electrical specifications, operates within the same temperature range, and carries active product status from onsemi. The parametric equivalence ensures functional compatibility without design modification. Packaging is supplied in Tape & Reel format with ROHS3 compliance.

74AHCT257PW,118 serves as an alternative when extended operating temperature range (-40°C ~ 125°C) is beneficial. However, the reduced output current specification (8mA versus 24mA) requires circuit-level evaluation. This part is suitable only for applications where the lower drive capability does not compromise system performance. ROHS3 compliance is confirmed.

Selection between these substitutes depends on output current requirements and temperature operating envelope of the target application.

Frequently Asked Questions (FAQ)

Q: Can MC74ACT157DTR2G replace 74ACT257MTCX without circuit modification?

A: Yes. MC74ACT157DTR2G is a parametric equivalent with identical voltage supply, output current, temperature range, and 16-TSSOP package specifications. Direct substitution is supported.

Q: What is the key difference between MC74ACT157DTR2G and 74AHCT257PW,118?

A: The primary difference is output current capability. MC74ACT157DTR2G delivers 24mA (matching the original), while 74AHCT257PW,118 delivers 8mA. Additionally, 74AHCT257PW,118 supports an extended temperature range to 125°C. Selection depends on circuit current requirements.

Q: Are all substitute parts in the same package?

A: Yes. All parts listed use the 16-TSSOP surface mount package with identical 0.173" width and 4.40mm dimensions. PCB layout compatibility is maintained.

Q: What is the product status of available substitutes?

A: MC74ACT157DTR2G and 74AHCT257PW,118 are both active products. The original 74ACT257MTCX is obsolete, making these substitutes necessary for new procurement.

Q: Are compliance certifications equivalent across all parts?

A: All parts carry REACH Unaffected status and MSL 1 (Unlimited) moisture sensitivity ratings. MC74ACT157DTR2G and 74AHCT257PW,118 are ROHS3 compliant. Compliance is consistent across the substitute group.