74ACT11257PW Equivalent & Substitute Parts

Part Overview

The 74ACT11257PW is a 4 x 2:1 multiplexer logic integrated circuit manufactured by Texas Instruments in a 20-TSSOP surface mount package. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and production continuity. The part operates with single supply voltage between 4.5V and 5.5V and is suitable for applications requiring multiplexing functionality in the 74ACT logic family.

Substiute Parts

74ACT11257PW

Texas InstrumentsIn Stock: 131374ACT11257PW Datasheet

Current PartRFQ

MC74ACT257DR2G

onsemiIn Stock: 2766MC74ACT257DR2G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 74ACT11257PW is determined by strict equivalence in the following electrical and mechanical parameters:

• Circuit configuration: 4 x 2:1 multiplexer topology
• Output current capability: 24mA high and low
• Supply voltage range: 4.5V ~ 5.5V single supply
• Operating temperature range: -40°C ~ 85°C
• Logic family: 74ACT series
• Mounting type: Surface mount

The primary substitute identified is the MC74ACT257DR2G manufactured by onsemi. While this part maintains functional and electrical equivalence, it differs in package type (16-SOIC versus 20-TSSOP), which requires PCB layout modification. Both parts are RoHS3 compliant and operate within identical electrical specifications.

Parameter Comparison

Engineering Selection Recommendations

The MC74ACT257DR2G is the primary substitute for the 74ACT11257PW based on functional and electrical equivalence within the 74ACT logic family. The substitute part is currently in active production status, ensuring long-term availability compared to the obsolete main part. Both components maintain identical electrical performance specifications and compliance certifications.

The primary design consideration is the package transition from 20-TSSOP to 16-SOIC, which requires PCB footprint modification. Pin-to-pin functional equivalence is maintained, but physical layout changes are necessary. Both parts carry MSL Level 1 rating and ROHS3 compliance, indicating equivalent handling and environmental requirements.

Frequently Asked Questions (FAQ)

Q: Can MC74ACT257DR2G directly replace 74ACT11257PW without circuit modification?

A: Electrical and functional replacement is direct. However, the package change from 20-TSSOP to 16-SOIC requires PCB footprint redesign. Pin functionality remains equivalent.

Q: Are there differences in supply voltage requirements between these parts?

A: No. Both parts operate identically within the 4.5V to 5.5V single supply range and maintain the same output current specifications of 24mA high and low.

Q: What is the impact of the package size difference?

A: The MC74ACT257DR2G uses a narrower 16-SOIC package (3.90mm width) compared to the 20-TSSOP package (4.40mm width) of the main part. This affects PCB layout and requires footprint modification but does not impact electrical performance.

Q: Are both parts suitable for the same operating temperature range?

A: Yes. Both the 74ACT11257PW and MC74ACT257DR2G operate across the identical temperature range of -40°C to 85°C.

Q: What are the compliance and handling differences?

A: Both parts are ROHS3 compliant and carry MSL Level 1 (Unlimited) moisture sensitivity rating, indicating equivalent environmental and handling requirements.