SN74HCS138DYYR Equivalent & Substitute Parts

Part Overview

The SN74HCS138DYYR is a 3-line to 8-line decoder/demultiplexer logic integrated circuit manufactured by Texas Instruments. This device functions as a decoder with a 1 x 3:8 circuit configuration, converting three binary input lines into eight mutually exclusive output lines. The part is classified as Active product status and is qualified to AEC-Q100 automotive standards. Substitute parts are identified when equivalent electrical performance, mechanical compatibility, and operational specifications are required for design flexibility, inventory management, or supply chain continuity.

Substiute Parts

SN74HCS138DYYR

Texas InstrumentsIn Stock: 3681SN74HCS138DYYR Datasheet

Current PartRFQ

SN74HCS138QDYYRQ1

Texas InstrumentsIn Stock: 3925SN74HCS138QDYYRQ1 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

Substitute parts for the SN74HCS138DYYR are determined by strict equivalence across the following critical parameters:

Electrical Equivalence Criteria:

• Circuit configuration: 1 x 3:8 decoder/demultiplexer
• Output current specifications: 7.8mA high and low
• Supply voltage range: 2V ~ 6V
• Operating temperature range: -40°C ~ 125°C
• Single supply voltage source

Mechanical Equivalence Criteria:

• Package type: SOT-23-16 Thin (16-SOT-23-THIN)
• Mounting type: Surface Mount
• Supplier device package: 16-SOT-23-THIN

Compliance Equivalence Criteria:

• Grade: Automotive
• Qualification: AEC-Q100
• Moisture Sensitivity Level: 1 (Unlimited)

All identified substitute parts meet these parameters without exception. Substitution is valid when the application requires any of these parts interchangeably within the specified electrical and mechanical constraints.

Parameter Comparison

Engineering Selection Recommendations

All identified substitute parts—SN74HCS138QDYYRQ1, SN74HCS238DYYR, and SN74HCS238QDYYRQ1—are Active product status devices manufactured by Texas Instruments. Each part carries AEC-Q100 automotive qualification and operates within identical electrical and mechanical specifications as the primary part SN74HCS138DYYR.

Selection among these parts is based on inventory availability and supply chain requirements. All parts are suitable for automotive applications requiring 3-line to 8-line decoder/demultiplexer functionality in SOT-23-16 Thin surface mount packages. The interchangeability is complete across all specified electrical parameters, operating conditions, and environmental ratings.

Frequently Asked Questions (FAQ)

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

A: Yes. Both parts share identical electrical specifications, circuit configuration (1 x 3:8), output current ratings (7.8mA), supply voltage range (2V ~ 6V), operating temperature range (-40°C ~ 125°C), package type (SOT-23-16 Thin), and AEC-Q100 automotive qualification. Direct substitution is valid.

Q: What is the difference between SN74HCS138DYYR and SN74HCS238DYYR?

A: Both parts are functionally equivalent 3-line to 8-line decoder/demultiplexers with identical electrical performance and mechanical specifications. The difference lies in the base product number designation (74HCS138 versus 74HCS238), but all critical parameters—voltage supply, output current, operating temperature, package type, and automotive qualification—are equivalent.

Q: Are all substitute parts qualified to the same automotive standard?

A: Yes. All substitute parts listed—SN74HCS138QDYYRQ1, SN74HCS238DYYR, and SN74HCS238QDYYRQ1—carry AEC-Q100 automotive qualification and are rated for -40°C ~ 125°C operating temperature, meeting automotive-grade requirements.

Q: Can these parts be used interchangeably in high-temperature automotive applications?

A: Yes. All parts operate across the identical temperature range of -40°C ~ 125°C and are automotive-grade components with AEC-Q100 qualification, suitable for automotive thermal environments.

Q: Is the SOT-23-16 Thin package compatible across all substitute parts?

A: Yes. All substitute parts use the SOT-23-16 Thin package (16-SOT-23-THIN supplier device package) with surface mount mounting type, ensuring mechanical and footprint compatibility on PCB designs.

Q: What is the moisture sensitivity level for these parts?

A: All parts carry Moisture Sensitivity Level (MSL) 1, which indicates unlimited shelf life and no moisture bake-out requirement prior to soldering.