SN74HCS157DR Equivalent & Substitute Parts

Part Overview

The SN74HCS157DR is a logic integrated circuit functioning as a quadruple 2-to-1 data selector/multiplexer. This component is manufactured by Texas Instruments and is classified within the 74HCS logic series. The device is currently in active production status and is widely used in digital signal routing and data selection applications requiring surface mount packaging.

Substitute parts are identified to provide alternative sourcing options when the primary part number is unavailable, while maintaining full functional and electrical compatibility within the specified operating parameters.

Substiute Parts

SN74HCS157DR

Texas InstrumentsIn Stock: 1928SN74HCS157DR Datasheet

Current PartRFQ

SN74HCS157QDRQ1

Texas InstrumentsIn Stock: 3073SN74HCS157QDRQ1 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SN74HCS157DR is determined by strict equivalence across the following critical parameters:

Functional Parameters:

• Circuit configuration: 4 x 2:1 multiplexer topology
• Independent circuits: 4 channels
• Type classification: Data Selector/Multiplexer

Electrical Parameters:

• Voltage supply range: 2V to 6V single supply
• Output current specifications: 7.8mA high, 7.8mA low
• Operating temperature range: -40°C to 125°C

Physical Parameters:

• Package designation: 16-SOIC with 0.154" (3.90mm) width
• Mounting technology: Surface mount
• Moisture sensitivity: MSL 1 (Unlimited)

Series Compatibility:

• Base product number: 74HCS157
• Manufacturer: Texas Instruments

Parts meeting all these criteria are classified as parametric equivalents and direct substitutes.

Parameter Comparison

Engineering Selection Recommendations

SN74HCS157DR is the standard commercial-grade variant of the 74HCS157 multiplexer series. This part is suitable for general-purpose logic applications where commercial temperature and reliability specifications are sufficient.

SN74HCS157QDRQ1 is the automotive-qualified variant of the same base product. This part carries AEC-Q100 qualification and is designated with the "Q" grade identifier, indicating compliance with automotive industry reliability and testing standards. Selection of this variant is required for applications subject to automotive qualification requirements or where AEC-Q100 certification is mandated by design specifications.

Both parts are functionally and electrically identical across all provided parameters. The distinction between them is the grade classification and associated qualification status. Selection between these two substitutes depends solely on whether automotive qualification is a requirement for the end application.

Frequently Asked Questions (FAQ)

Q: Can SN74HCS157QDRQ1 be used as a direct replacement for SN74HCS157DR?

A: Yes. The SN74HCS157QDRQ1 is a direct parametric equivalent. All electrical characteristics, circuit configuration, output current ratings, voltage supply range, operating temperature range, and package specifications are identical. The automotive qualification of the QDRQ1 variant does not restrict its use in non-automotive applications.

Q: What is the difference between the SN74HCS157DR and SN74HCS157QDRQ1?

A: The primary difference is the grade classification and qualification status. The SN74HCS157QDRQ1 carries AEC-Q100 automotive qualification, while the SN74HCS157DR is a standard commercial-grade part. Both devices are manufactured by Texas Instruments and share identical functional and electrical specifications.

Q: Are these parts pin-compatible?

A: Yes. Both parts use the 16-SOIC package with identical pinout and footprint. No PCB layout modifications are required when substituting between these part numbers.

Q: What is the operating temperature range for both parts?

A: Both the SN74HCS157DR and SN74HCS157QDRQ1 operate across the temperature range of -40°C to 125°C.

Q: What voltage supply range is supported?

A: Both parts operate with a single supply voltage ranging from 2V to 6V.

Q: What is the output current capability?

A: Both parts provide 7.8mA output current for both high and low logic states.

Q: Are these parts RoHS compliant?

A: RoHS status is not applicable to these parts according to the provided specifications.

Q: What is the moisture sensitivity level?

A: Both parts have a Moisture Sensitivity Level (MSL) of 1, indicating unlimited shelf life without moisture control requirements.