SN74LVC257ADG4 Equivalent & Substitute Parts

Part Overview

The SN74LVC257ADG4 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 device functions as a data selector, routing one of two input signals to a single output based on control logic, with applications in signal multiplexing and data path selection in digital systems.

Substiute Parts

SN74LVC257ADG4

Texas InstrumentsIn Stock: 1024SN74LVC257ADG4 Datasheet

Current PartRFQ

74LVC257AD,118

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

DirectRFQ

74LCX257MX

Fairchild SemiconductorIn Stock: 1017474LCX257MX Datasheet

MFR RecommendedRFQ

MC74LCX257DR2G

onsemiIn Stock: 1690MC74LCX257DR2G Datasheet

MFR RecommendedRFQ

SN74LVC257AD

Texas InstrumentsIn Stock: 1362SN74LVC257AD Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the SN74LVC257ADG4 is determined by the following critical parameters: circuit configuration (4 x 2:1 multiplexer), package type (16-SOIC), voltage supply range compatibility, output current capability, and operating temperature range. Substitute parts must maintain the same functional circuit topology and physical package dimensions to ensure direct replacement without PCB redesign.

The substitute parts are grouped into three categories based on their relationship to the main part:

Direct Manufacturer Equivalent: Parts with identical or superior electrical specifications from alternative manufacturers, maintaining full functional compatibility.

Manufacturer Recommended Substitute: Parts from established manufacturers with compatible circuit function and package, though with modified electrical parameters within acceptable operating ranges.

Parametric Equivalent: Parts from the original manufacturer with identical specifications but different packaging or product status, ensuring functional interchangeability.

Parameter Comparison

Engineering Selection Recommendations

SN74LVC257AD (Texas Instruments): This parametric equivalent from Texas Instruments provides identical electrical specifications to the obsolete SN74LVC257ADG4, with the same voltage supply range (1.65V ~ 3.6V) and output current ratings (24mA). The part is currently active and ROHS3 compliant, making it the preferred direct replacement when maintaining the original manufacturer's product line is required.

74LVC257AD,118 (Nexperia USA Inc.): This direct manufacturer equivalent offers superior voltage supply range (1.2V ~ 3.6V) and extended operating temperature range (-40°C ~ 125°C) compared to the original part. Output current specifications match the main part at 24mA. The part is active and ROHS3 compliant, suitable for applications requiring extended temperature performance.

74LCX257MX (Fairchild Semiconductor): This manufacturer-recommended substitute operates within a narrower voltage supply range (2V ~ 3.6V) and maintains identical output current (24mA) and operating temperature specifications. The part is active and available in high inventory, providing a cost-effective alternative when the minimum supply voltage requirement of 2V is acceptable.

MC74LCX257DR2G (onsemi): This alternative operates with reduced output current (8mA) and a higher minimum supply voltage (2.3V ~ 3.6V). Selection of this part requires verification that the reduced output current meets system load requirements. The part is active and ROHS3 compliant.

Frequently Asked Questions (FAQ)

Q: Can the SN74LVC257AD directly replace the obsolete SN74LVC257ADG4?

A: Yes. The SN74LVC257AD is a parametric equivalent with identical electrical specifications, including voltage supply range (1.65V ~ 3.6V), output current (24mA), and operating temperature range (-40°C ~ 85°C). Both use the 16-SOIC package with identical pinout and functional behavior.

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

A: Both series are 4 x 2:1 multiplexers in 16-SOIC packages with compatible pinouts. The 74LCX series (74LCX257MX, MC74LCX257DR2G) operates at higher minimum supply voltages (2V and 2.3V respectively) compared to 74LVC parts (1.65V minimum). Select based on your system's minimum supply voltage requirement.

Q: Why does MC74LCX257DR2G have lower output current (8mA vs 24mA)?

A: The MC74LCX257DR2G is a variant within the 74LCX family with reduced output drive capability. Use this part only if your circuit's load impedance and signal integrity requirements are compatible with 8mA output current. For applications requiring 24mA drive capability, select 74LVC or 74LCX257MX alternatives.

Q: Are all substitute parts ROHS3 compliant?

A: The SN74LVC257AD, 74LVC257AD,118, and MC74LCX257DR2G are confirmed ROHS3 compliant. The 74LCX257MX compliance status is not specified in available documentation. Verify RoHS compliance with the supplier if regulatory certification is required for your application.

Q: Can I use 74LVC257AD,118 in applications requiring -40°C to 85°C operation?

A: Yes. The 74LVC257AD,118 operates across -40°C to 125°C, which encompasses the -40°C to 85°C range. This part is suitable for all temperature profiles required by the original SN74LVC257ADG4.

Q: What packaging options are available for these substitutes?

A: All substitute parts use the 16-SOIC surface mount package. The SN74LVC257AD is supplied in Tube packaging, while 74LVC257AD,118 and MC74LCX257DR2G are supplied in Tape & Reel format. Verify packaging compatibility with your assembly process requirements.