74HC257DB,112 Equivalent & Substitute Parts Reference

Part Overview

The 74HC257DB,112 is a 4 x 2:1 multiplexer logic integrated circuit manufactured by Nexperia USA Inc. in a 16-SSOP surface mount package. This component functions as a data selector, routing one of four input pairs to a single output based on control signals. The part is currently listed as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and production continuity.

Substiute Parts

74HC257DB,112

Nexperia USA Inc.In Stock: 90374HC257DB,112 Datasheet

Current PartRFQ

SN74HC157DBR

Texas InstrumentsIn Stock: 3165SN74HC157DBR Datasheet

DirectRFQ

SN74HC257PW

Texas InstrumentsIn Stock: 1310SN74HC257PW Datasheet

SimilarRFQ

SN74HC257PWR

Texas InstrumentsIn Stock: 1951SN74HC257PWR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 74HC257DB,112 is determined by the following critical parameters:

Functional Equivalence: Circuit configuration (4 x 2:1 multiplexer), independent circuit count (1), output current capability (7.8mA high/low), and voltage supply range (2V ~ 6V) must remain identical.

Package Compatibility: The original part uses 16-SSOP packaging. Direct substitutes must use the same 16-SSOP package to maintain PCB layout compatibility without redesign.

Electrical Performance: Supply voltage range, output current ratings, and logic family (74HC series) establish the baseline for functional interchangeability.

Compliance & Certification: RoHS3 compliance and REACH unaffected status are maintained across all substitute options.

The substitute parts identified fall into two categories:

1. Direct Package Match (16-SSOP): SN74HC157DBR maintains identical package geometry and pinout compatibility.

2. Alternative Package (16-TSSOP): SN74HC257PW and SN74HC257PWR use 16-TSSOP packaging (0.173", 4.40mm width), which differs in physical dimensions and requires PCB layout modification.

Parameter Comparison

Engineering Selection Recommendations

For Direct PCB Compatibility (No Layout Modification Required):

SN74HC157DBR is the primary substitute. It maintains identical 16-SSOP packaging, matching pinout and footprint. Texas Instruments manufactures this part with active product status, ensuring long-term availability. Operating temperature range is -40°C to 85°C, which is narrower than the original part's -40°C to 125°C specification. This difference must be evaluated against your application's thermal requirements.

For Alternative Packaging (PCB Layout Modification Required):

SN74HC257PW and SN74HC257PWR both use 16-TSSOP packaging and require PCB footprint redesign. SN74HC257PWR carries active product status with 1900 units in stock, providing superior long-term availability compared to SN74HC257PW, which is discontinued at DiGi Electronics. Both parts meet all functional and compliance requirements.

Compliance Considerations:

All substitute options maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment with the original part.

Frequently Asked Questions (FAQ)

Q: Can SN74HC157DBR be used as a direct replacement for 74HC257DB,112?

A: SN74HC157DBR is functionally equivalent and uses identical 16-SSOP packaging. However, the operating temperature range differs: SN74HC157DBR operates from -40°C to 85°C, while the original part operates to 125°C. Verify your application does not require operation above 85°C.

Q: What is the difference between 16-SSOP and 16-TSSOP packages?

A: 16-SSOP measures 0.209" (5.30mm) in width, while 16-TSSOP measures 0.173" (4.40mm) in width. These are physically different packages requiring different PCB footprints. Substituting between them requires PCB layout modification.

Q: Are SN74HC257PW and SN74HC257PWR interchangeable?

A: Both parts use identical 16-TSSOP packaging and meet the same functional specifications. SN74HC257PWR is actively manufactured by Texas Instruments, while SN74HC257PW is discontinued at DiGi Electronics. For new designs or production continuity, SN74HC257PWR is the preferred choice.

Q: Do all substitute parts meet RoHS and REACH requirements?

A: Yes. All identified substitutes are ROHS3 compliant and REACH unaffected, matching the compliance profile of the original 74HC257DB,112.

Q: What is the inventory status of these substitutes?

A: SN74HC157DBR has 3124 units in stock. SN74HC257PWR has 1900 units in stock. SN74HC257PW has 1279 units in stock. Availability should be confirmed with your component supplier before design finalization.