SN74HCS251DR Equivalent & Substitute Parts

Part Overview

The SN74HCS251DR is an active-status data selector/multiplexer integrated circuit manufactured by Texas Instruments. This 1 x 8:1 multiplexer logic device is designed for applications requiring high-speed data selection and routing in digital systems. The device is housed in a 16-SOIC surface mount package and operates across a wide supply voltage range of 2V to 6V, making it suitable for both standard and low-power applications.

Substitute parts are identified when equivalent electrical performance, mechanical compatibility, and operational parameters align with the original specification. The availability of alternative part numbers within the same product family ensures design flexibility and supply chain continuity.

Substiute Parts

SN74HCS251DR

Texas InstrumentsIn Stock: 1478SN74HCS251DR Datasheet

Current PartRFQ

SN74HCS151DR

Texas InstrumentsIn Stock: 2952SN74HCS151DR Datasheet

Parametric EquivalentRFQ

SN74HCS151QDRQ1

Texas InstrumentsIn Stock: 2973SN74HCS151QDRQ1 Datasheet

Parametric EquivalentRFQ

SN74HCS251QDRQ1

Texas InstrumentsIn Stock: 3302SN74HCS251QDRQ1 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SN74HCS251DR are identified based on strict parametric equivalence across the following critical criteria:

Electrical Parameters:

• Circuit configuration: 1 x 8:1 multiplexer topology
• Supply voltage range: 2V ~ 6V single supply operation
• Output current specifications: 7.8mA high and low
• Operating temperature range: -40°C ~ 125°C

Mechanical Parameters:

• Package type: 16-SOIC surface mount
• Physical dimensions: 0.154" width (3.90mm)
• Packaging format: Tape & Reel (TR)

Product Characteristics:

• Series family: 74HCS logic family
• Manufacturer: Texas Instruments
• Product status: Active

All substitute parts listed maintain identical electrical performance and mechanical compatibility with the SN74HCS251DR. Differences in part numbering reflect either base product designation variations (SN74HCS151 vs. SN74HCS251) or automotive-grade qualification (QDRQ1 suffix indicating AEC-Q100 compliance).

Parameter Comparison

Engineering Selection Recommendations

All four parts listed—SN74HCS251DR, SN74HCS151DR, SN74HCS151QDRQ1, and SN74HCS251QDRQ1—are active-status products from Texas Instruments with identical electrical and mechanical specifications. Selection between these parts depends on application requirements and supply chain availability.

Standard Grade Selection: The SN74HCS251DR and SN74HCS151DR are suitable for general-purpose digital logic applications where automotive qualification is not required. Both parts maintain full parametric equivalence and are interchangeable in non-automotive designs.

Automotive Grade Selection: The SN74HCS151QDRQ1 and SN74HCS251QDRQ1 are qualified to AEC-Q100 automotive standards and are designated for use in automotive and high-reliability applications. These parts undergo additional qualification testing and are appropriate for designs requiring automotive-grade components.

Base Product Number Considerations: The SN74HCS251 and SN74HCS151 base product numbers represent different internal logic configurations within the same 1 x 8:1 multiplexer family. Both are functionally equivalent for 8-to-1 data selection applications and share identical electrical performance parameters.

Frequently Asked Questions (FAQ)

Q: Can SN74HCS151DR be used as a direct replacement for SN74HCS251DR?

A: Yes. Both parts are 1 x 8:1 data selector/multiplexer devices with identical electrical specifications, output current ratings, supply voltage range (2V ~ 6V), operating temperature range (-40°C ~ 125°C), and 16-SOIC package configuration. They are parametrically equivalent and interchangeable in circuit applications.

Q: What is the difference between standard grade (DR) and automotive grade (QDRQ1) parts?

A: The QDRQ1 suffix indicates AEC-Q100 automotive qualification, which involves additional reliability testing and quality assurance procedures. The electrical and mechanical parameters remain identical. Automotive-grade parts are required for applications subject to automotive industry standards; standard-grade parts are suitable for general industrial and consumer applications.

Q: Are the SN74HCS251 and SN74HCS151 base product numbers functionally different?

A: Both base product numbers represent 1 x 8:1 multiplexer configurations with identical electrical performance. The different base numbers reflect design variations within the 74HCS logic family, but they deliver equivalent functionality for data selection applications.

Q: Can these parts be used interchangeably in the same PCB layout?

A: Yes. All four substitute parts use the identical 16-SOIC surface mount package with 0.154" width (3.90mm). PCB footprints, land patterns, and mounting procedures are identical across all listed parts.

Q: What supply voltage range is supported by these multiplexer devices?

A: All parts operate with a single supply voltage range of 2V to 6V, enabling use in both standard 5V logic systems and low-power 3.3V or lower voltage applications.

Q: Are there any moisture sensitivity or handling restrictions?

A: All parts carry Moisture Sensitivity Level (MSL) 1, which indicates unlimited shelf life and no special moisture control requirements during storage or handling.

Q: What is the output current capability of these multiplexer devices?

A: All parts deliver 7.8mA output current in both high and low states, providing adequate drive capability for standard TTL and CMOS logic loads.