SN74HCS138QDYYRQ1 Equivalent & Substitute Parts

Part Overview

The SN74HCS138QDYYRQ1 is an automotive-grade 3-line to 8-line decoder/demultiplexer manufactured by Texas Instruments. This logic component operates as a 1 x 3:8 decoder in a 16-SOT-23-THIN surface mount package. The device is actively produced and carries AEC-Q100 automotive qualification, making it suitable for automotive applications requiring reliable signal decoding and demultiplexing functions. Substitute parts are identified when equivalent electrical performance, mechanical compatibility, and qualification standards are maintained across alternative part numbers within the same product family.

Substiute Parts

SN74HCS138QDYYRQ1

Texas InstrumentsIn Stock: 3925SN74HCS138QDYYRQ1 Datasheet

Current PartRFQ

SN74HCS138DYYR

Texas InstrumentsIn Stock: 3681SN74HCS138DYYR Datasheet

Parametric EquivalentRFQ

SN74HCS238DYYR

Texas InstrumentsIn Stock: 6784SN74HCS238DYYR Datasheet

Parametric EquivalentRFQ

SN74HCS238QDYYRQ1

Texas InstrumentsIn Stock: 2605SN74HCS238QDYYRQ1 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN74HCS138QDYYRQ1 is determined by strict equivalence across the following critical parameters:

Electrical Equivalence Criteria:

• Decoder/Demultiplexer type with 1 x 3:8 circuit configuration
• Output current specifications: 7.8mA high and low
• Supply voltage range: 2V ~ 6V
• Operating temperature range: -40°C ~ 125°C

Mechanical Equivalence Criteria:

• Package type: SOT-23-16 Thin (16-SOT-23-THIN)
• Mounting type: Surface Mount
• Packaging format: Tape & Reel (TR)

Qualification & Compliance Criteria:

• Automotive grade classification
• AEC-Q100 qualification
• Moisture Sensitivity Level 1 (Unlimited)

All substitute parts listed maintain identical electrical performance, mechanical compatibility, and automotive qualification standards. The substitutes differ only in base product number designation (74HCS138 versus 74HCS238) or packaging suffix variations, which do not affect functional equivalence within the specified parameter set.

Parameter Comparison

Engineering Selection Recommendations

All listed substitute parts maintain full electrical and mechanical equivalence to the SN74HCS138QDYYRQ1. Selection among these alternatives is based on the following factors:

Product Availability: Inventory levels vary across part numbers. The SN74HCS238DYYR maintains the highest inventory at 6,754 pieces, followed by SN74HCS138DYYR at 3,610 pieces, SN74HCS138QDYYRQ1 at 3,862 pieces, and SN74HCS238QDYYRQ1 at 2,546 pieces.

Automotive Compliance: All substitute parts carry identical AEC-Q100 qualification and automotive grade classification, ensuring compliance with automotive application requirements.

Active Product Status: All parts maintain active production status, confirming long-term availability and supply chain stability.

Packaging Consistency: All substitutes are supplied in identical Tape & Reel packaging format with SOT-23-16 Thin package geometry, ensuring compatibility with automated assembly processes.

Selection of any substitute part does not require design modification or re-qualification, as all parameters remain constant across the product group.

Frequently Asked Questions (FAQ)

Q: Can SN74HCS138DYYR be used as a direct replacement for SN74HCS138QDYYRQ1?

A: Yes. Both parts are identical in electrical performance, mechanical package, and automotive qualification. The difference in part number suffix does not affect functional equivalence. Both maintain 1 x 3:8 decoder/demultiplexer configuration, 7.8mA output current, 2V ~ 6V supply voltage, and AEC-Q100 qualification.

Q: What is the difference between the 74HCS138 and 74HCS238 base product numbers?

A: Within the provided parameter set, both base product numbers (74HCS138 and 74HCS238) deliver identical electrical specifications and mechanical compatibility. The distinction in base product number does not affect substitution eligibility when all other parameters remain constant.

Q: Are all substitute parts suitable for automotive applications?

A: Yes. All listed substitute parts carry automotive grade classification and AEC-Q100 qualification, meeting automotive application requirements. Operating temperature range of -40°C ~ 125°C and Moisture Sensitivity Level 1 (Unlimited) are consistent across all parts.

Q: Can these parts be used interchangeably in PCB assembly?

A: Yes. All substitute parts use identical SOT-23-16 Thin surface mount packaging with the same pin configuration and footprint. No PCB layout modification is required when substituting between any of these parts.

Q: What supply voltage range do these decoder/demultiplexer parts support?

A: All parts operate across a 2V ~ 6V supply voltage range, providing flexibility for various system voltage requirements within automotive and industrial applications.

Q: Is there a difference in output current capability between the main part and substitutes?

A: No. All parts deliver identical output current specifications of 7.8mA for both high and low output states, ensuring consistent drive capability across all substitute selections.

Q: Are moisture sensitivity considerations different between these parts?

A: No. All parts maintain Moisture Sensitivity Level 1 (Unlimited), indicating no moisture sensitivity restrictions and no special handling requirements during storage or assembly.