SN74LVC257ADT Equivalent & Substitute Parts

Part Overview

The SN74LVC257ADT is a 4 x 2:1 multiplexer logic integrated circuit manufactured by Texas Instruments 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 SN74LVC257ADT operates across a single supply voltage range of 1.65V to 3.6V with output currents of 24mA (high and low), suitable for low-voltage digital logic applications requiring multiplexing functionality.

Substiute Parts

SN74LVC257ADT

Texas InstrumentsIn Stock: 931SN74LVC257ADT Datasheet

Current PartRFQ

SN74LVC257ADR

Texas InstrumentsIn Stock: 4926SN74LVC257ADR Datasheet

Parametric EquivalentRFQ

74LCX257MX

Fairchild SemiconductorIn Stock: 1017474LCX257MX Datasheet

MFR RecommendedRFQ

74LVC257AD,118

Nexperia USA Inc.In Stock: 307174LVC257AD,118 Datasheet

MFR RecommendedRFQ

MC74LCX257DR2G

onsemiIn Stock: 1690MC74LCX257DR2G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the SN74LVC257ADT is determined by the following critical parameters: circuit configuration (4 x 2:1 multiplexer), package type (16-SOIC), mounting method (surface mount), and electrical compatibility within the specified voltage and current ranges. All substitute parts must maintain the same functional circuit topology and physical package dimensions to ensure direct replacement capability.

The substitute parts are grouped into two categories:

Parametric Equivalent (Direct Replacement): Parts that match all critical electrical and mechanical parameters, allowing seamless substitution without design modification.

Manufacturer Recommended Alternatives: Parts from different manufacturers that provide equivalent functionality with minor parameter variations within acceptable engineering tolerances.

Parameter Comparison

Engineering Selection Recommendations

SN74LVC257ADR (Texas Instruments): This is the primary parametric equivalent. It maintains identical electrical specifications and package configuration as the SN74LVC257ADT while offering active product status and improved availability. This part is the preferred direct replacement.

74LVC257AD,118 (Nexperia USA Inc.): This substitute provides extended operating temperature range (-40°C to 125°C) and lower minimum supply voltage (1.2V), offering enhanced performance margins in temperature-sensitive applications. It is ROHS3 compliant with active product status.

74LCX257MX (Fairchild Semiconductor): This alternative maintains equivalent output current and package specifications but operates within a minimum supply voltage of 2V. It is suitable for applications where the 1.65V lower limit of the original part is not required.

MC74LCX257DR2G (onsemi): This substitute features reduced output current (8mA versus 24mA) and a higher minimum supply voltage (2.3V). Selection of this part requires verification that the reduced output current meets application requirements.

All substitute parts maintain ROHS3 compliance and MSL rating 1 status, ensuring compatibility with standard manufacturing and storage protocols.

Frequently Asked Questions (FAQ)

Q: Can SN74LVC257ADR be used as a direct replacement for SN74LVC257ADT?

A: Yes. The SN74LVC257ADR is a parametric equivalent with identical electrical specifications, package type, and circuit configuration. The primary difference is product status (active versus obsolete) and packaging format (Tape & Reel versus tube). Both are suitable for direct substitution in existing designs.

Q: What is the key difference between the 74LVC and 74LCX series substitutes?

A: Both series provide 4 x 2:1 multiplexer functionality in 16-SOIC packages. The 74LCX series (Fairchild and onsemi variants) operates at a minimum supply voltage of 2V or higher, compared to 1.65V for the 74LVC series. Selection depends on the application's minimum supply voltage requirement.

Q: Is MC74LCX257DR2G suitable for high-current applications?

A: No. The MC74LCX257DR2G provides 8mA output current compared to 24mA for the original part. This substitute is appropriate only for applications with lower current demands. Verify output current requirements before selection.

Q: Are all substitute parts RoHS compliant?

A: The SN74LVC257ADR, 74LVC257AD,118, and MC74LCX257DR2G are explicitly ROHS3 compliant. The 74LCX257MX does not specify RoHS status in the provided data. Confirm compliance requirements with your procurement or quality department.

Q: What is the significance of MSL rating 1?

A: MSL (Moisture Sensitivity Level) rating 1 indicates unlimited shelf life without moisture control requirements. All listed substitutes carry this rating, ensuring compatibility with standard storage and handling procedures.

Q: Can I use 74LVC257AD,118 in applications requiring operation below 1.65V?

A: Yes. The 74LVC257AD,118 supports supply voltages as low as 1.2V, providing additional margin for low-voltage applications. This part is suitable for designs requiring extended voltage range performance.