74AC257MTCX Equivalent & Substitute Parts

Part Overview

The 74AC257MTCX is a 4 x 2:1 multiplexer logic integrated circuit manufactured by onsemi in a 16-TSSOP surface mount package. This component functions as a data selector, routing one of four input signals to a single output based on control logic. The part is classified as obsolete, making equivalent and substitute components necessary for new designs and ongoing production requirements. Substitute parts must maintain functional equivalence through matching circuit topology, electrical performance, and package specifications.

Substiute Parts

74AC257MTCX

onsemiIn Stock: 107374AC257MTCX Datasheet

Current PartRFQ

MC74AC157DTR2G

onsemiIn Stock: 3271MC74AC157DTR2G Datasheet

Parametric EquivalentRFQ

74AHC257PW,118

NXP SemiconductorsIn Stock: 1254774AHC257PW,118 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 74AC257MTCX is determined by the following critical parameters: circuit topology (4 x 2:1 multiplexer configuration), output current capability (24mA minimum for both high and low states), supply voltage compatibility (minimum 2V to 6V range), operating temperature range (minimum -40°C to 85°C), and identical 16-TSSOP package footprint. Parts meeting these criteria are classified as parametric equivalents. Parts with reduced output current (8mA) or narrower voltage/temperature ranges are classified as similar alternatives with application-dependent compatibility.

Parameter Comparison

Engineering Selection Recommendations

MC74AC157DTR2G is the primary parametric equivalent for 74AC257MTCX replacement. Both parts are manufactured by onsemi, share identical electrical specifications (24mA output current, 2V–6V supply range, -40°C to 85°C operating temperature), and use the same 16-TSSOP package. MC74AC157DTR2G maintains active product status and ROHS3 compliance, ensuring long-term availability and regulatory alignment.

74AHC257PW,118 from NXP Semiconductors is a similar alternative suitable for applications where reduced output current (8mA) is acceptable and extended temperature operation to 125°C is beneficial. The narrower supply voltage range (2V–5.5V) requires verification against circuit requirements. This part is active and available in higher inventory quantities.

Selection between these substitutes depends on output current requirements and thermal operating conditions specific to the application circuit.

Frequently Asked Questions (FAQ)

Q: Can MC74AC157DTR2G directly replace 74AC257MTCX? A: Yes. Both parts are parametric equivalents with matching 4 x 2:1 multiplexer circuits, 24mA output current, 2V–6V supply voltage range, -40°C to 85°C operating temperature, and 16-TSSOP package footprint. Pin-to-pin compatibility and electrical performance are identical.

Q: What is the difference between MC74AC157DTR2G and 74AHC257PW,118? A: MC74AC157DTR2G maintains the original 24mA output current specification. 74AHC257PW,118 provides reduced output current (8mA) and extended temperature range to 125°C, with a narrower supply voltage maximum of 5.5V. Selection depends on circuit current requirements and thermal constraints.

Q: Are all substitute parts in the same package? A: Yes. All listed parts use the 16-TSSOP package with 0.173" width and 4.40mm dimensions, ensuring identical PCB footprint compatibility.

Q: Why is 74AC257MTCX marked obsolete? A: Product obsolescence reflects manufacturer discontinuation. MC74AC157DTR2G and 74AHC257PW,118 are active alternatives ensuring continued design support and component availability.

Q: What compliance certifications apply to these parts? A: MC74AC157DTR2G is ROHS3 compliant. All parts are REACH unaffected and classified under ECCN EAR99 with HTSUS code 8542.39.0001. Moisture sensitivity level is MSL 1 (unlimited) for all parts.