SN74HC257D Equivalent & Substitute Parts

Part Overview

The SN74HC257D is a 4 x 2:1 multiplexer logic integrated circuit manufactured by Texas Instruments in a 16-SOIC surface mount package. This component is currently discontinued at DiGi Electronics, making equivalent and substitute parts necessary for ongoing design support and production requirements. The part operates across a 2V to 6V supply range with output currents of 7.8mA for both high and low states, suitable for general-purpose logic multiplexing applications in digital systems.

Substiute Parts

SN74HC257D

Texas InstrumentsIn Stock: 150490SN74HC257D Datasheet

Current PartRFQ

SN74HC257DR

Texas InstrumentsIn Stock: 5358SN74HC257DR Datasheet

DirectRFQ

74HC257D,653

Nexperia USA Inc.In Stock: 830074HC257D,653 Datasheet

MFR RecommendedRFQ

SN74HC158D

Texas InstrumentsIn Stock: 1636SN74HC158D Datasheet

Parametric EquivalentRFQ

SN74HC258D

Texas InstrumentsIn Stock: 2935SN74HC258D Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the SN74HC257D is determined by the following critical parameters: circuit configuration (4 x 2:1 multiplexer), package type (16-SOIC), voltage supply range (2V ~ 6V), output current specifications (7.8mA), and operating temperature range. Parts are grouped into three substitution categories based on their relationship to the main part:

Direct Manufacturer Equivalent: Parts with identical electrical specifications and package, differing only in packaging format (tape and reel versus tube).

Manufacturer Recommended Equivalent: Parts from alternative manufacturers meeting all electrical and mechanical specifications with potential extended operating temperature ranges.

Parametric Equivalent: Parts with identical circuit function and electrical parameters but different base product numbers, indicating functional interchangeability within the same logic family.

Parameter Comparison

Engineering Selection Recommendations

For active production and new designs, SN74HC257DR is the primary substitute, offering identical electrical specifications to the discontinued SN74HC257D with the advantage of active product status and availability in standard reel packaging formats.

The Nexperia part 74HC257D,653 provides an alternative from a different manufacturer while maintaining full electrical compatibility. This part offers an extended operating temperature range to -40°C ~ 125°C, providing additional thermal margin for applications requiring higher temperature operation.

SN74HC158D and SN74HC258D are parametric equivalents with identical circuit function and electrical performance. Both parts carry Last Time Buy status, indicating limited future availability. These parts are suitable for direct substitution in existing designs but should not be selected for new production due to their discontinued status trajectory.

All substitute parts maintain ROHS3 compliance and identical moisture sensitivity levels, ensuring compatibility with standard manufacturing and storage requirements.

Frequently Asked Questions (FAQ)

Q: Can SN74HC257DR be used as a direct replacement for SN74HC257D?

A: Yes. SN74HC257DR is electrically and functionally identical to SN74HC257D. The difference is packaging format: SN74HC257DR is supplied in cut tape and Digi-Reel format, while SN74HC257D is supplied in tube format. Both parts are 16-SOIC packages with identical pin configurations and electrical specifications.

Q: What is the difference between SN74HC257D and SN74HC158D?

A: Both parts are 4 x 2:1 multiplexers in 16-SOIC packages with identical electrical specifications. The difference is the base product number (257 versus 158), indicating different internal logic configurations. Both are parametric equivalents suitable for multiplexing applications with identical voltage supply, output current, and operating temperature ranges.

Q: Why does the Nexperia part 74HC257D,653 have a higher operating temperature range?

A: The Nexperia part specifies -40°C ~ 125°C operating temperature compared to -40°C ~ 85°C for Texas Instruments parts. This represents the manufacturer's tested and rated operating range. The extended upper temperature limit provides additional thermal margin for applications in elevated temperature environments.

Q: Are all substitute parts RoHS compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance status, meeting environmental and hazardous substance restrictions for electronic components.

Q: Can I mix packaging formats in production?

A: Yes. All parts listed are functionally and electrically identical. Packaging format differences (tube, cut tape, tape and reel) affect only handling, storage, and assembly processes. The actual component performance and pin configuration remain unchanged.

Q: What should I do if SN74HC257DR becomes unavailable?

A: The Nexperia part 74HC257D,653 is the recommended alternative, offering active product status and extended temperature range. SN74HC158D and SN74HC258D remain available but carry Last Time Buy status, indicating limited future availability windows.