SN74LVC138AQDREP Equivalent & Substitute Parts

Part Overview

The SN74LVC138AQDREP is a decoder/demultiplexer logic IC manufactured by Texas Instruments, featuring a 1 x 3:8 circuit configuration in a 16-SOIC surface mount package. This active product operates across a 2V to 3.6V supply range with output currents of 24mA for both high and low states. The device is ROHS3 compliant with unlimited moisture sensitivity rating, making it suitable for industrial and commercial applications requiring address decoding or demultiplexing functions. Equivalent and substitute parts are identified based on matching electrical specifications, package compatibility, and functional equivalence within the 74LVC/74LCX logic families.

Substiute Parts

SN74LVC138AQDREP

Texas InstrumentsIn Stock: 977SN74LVC138AQDREP Datasheet

Current PartRFQ

SN74LVC138AQDRG4Q1

Texas InstrumentsIn Stock: 1003SN74LVC138AQDRG4Q1 Datasheet

Parametric EquivalentRFQ

SN74LVC138AQDRQ1

Texas InstrumentsIn Stock: 4137SN74LVC138AQDRQ1 Datasheet

Parametric EquivalentRFQ

MC74LCX138DR2G

onsemiIn Stock: 8711MC74LCX138DR2G Datasheet

DirectRFQ

74LCX138MX

Fairchild SemiconductorIn Stock: 1656674LCX138MX Datasheet

MFR RecommendedRFQ

74LVC138AD,118

Nexperia USA Inc.In Stock: 1004574LVC138AD,118 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SN74LVC138AQDREP is determined by the following critical parameters: decoder/demultiplexer function type, 1 x 3:8 circuit configuration, 24mA output current capability, 2V to 3.6V supply voltage compatibility, 16-SOIC package format, and surface mount mounting type. Parts are grouped into three categories based on their relationship to the main part:

Parametric Equivalents maintain identical electrical specifications and operating temperature ranges, with automotive-grade variants (AEC-Q100 qualified) available as SN74LVC138AQDRG4Q1 and SN74LVC138AQDRQ1.

Direct Manufacturer Alternatives include the MC74LCX138DR2G from onsemi, which matches all core electrical parameters but operates to -40°C to 85°C, and the 74LCX138MX from Fairchild Semiconductor with identical functional specifications.

MFR Recommended Alternatives include the 74LVC138AD,118 from Nexperia USA Inc., which extends the supply voltage range to 1.2V ~ 3.6V while maintaining the same circuit function and package, and the 74LCX138MX from Fairchild Semiconductor.

Parameter Comparison

Engineering Selection Recommendations

Selection among equivalent and substitute parts for the SN74LVC138AQDREP should be based on application-specific requirements and compliance certifications:

For standard industrial applications requiring the full -40°C to 125°C operating range, the SN74LVC138AQDREP, SN74LVC138AQDRG4Q1, SN74LVC138AQDRQ1, and 74LVC138AD,118 are functionally equivalent. The 74LVC138AD,118 from Nexperia offers extended lower voltage operation to 1.2V, providing additional design flexibility for low-power applications.

For automotive applications requiring AEC-Q100 qualification, the SN74LVC138AQDRG4Q1 and SN74LVC138AQDRQ1 are the appropriate selections, both maintaining the full temperature range and ROHS3 compliance.

For applications with temperature constraints limited to -40°C to 85°C, the MC74LCX138DR2G from onsemi and 74LCX138MX from Fairchild Semiconductor are suitable alternatives with equivalent electrical performance.

For supply voltage flexibility in designs operating below 2V, the 74LVC138AD,118 extends the minimum supply voltage to 1.2V while maintaining all other electrical specifications.

Frequently Asked Questions (FAQ)

Q: Can the SN74LVC138AQDREP be directly replaced with the MC74LCX138DR2G?

A: Direct replacement is possible if the application operates within the MC74LCX138DR2G temperature range of -40°C to 85°C. Both devices share identical circuit configuration, output current ratings, supply voltage range, and 16-SOIC package format. The MC74LCX138DR2G is suitable for applications not requiring the extended 125°C upper temperature limit.

Q: What is the difference between the standard SN74LVC138AQDREP and the automotive-grade variants?

A: The SN74LVC138AQDRG4Q1 and SN74LVC138AQDRQ1 are automotive-grade versions with AEC-Q100 qualification, designed for automotive applications requiring enhanced reliability and traceability. All three devices maintain identical electrical specifications, supply voltage range, and operating temperature range of -40°C to 125°C.

Q: Is the 74LVC138AD,118 from Nexperia compatible with the SN74LVC138AQDREP?

A: Yes, the 74LVC138AD,118 is functionally compatible. It maintains the same decoder/demultiplexer 1 x 3:8 configuration, 24mA output current, 16-SOIC package, and -40°C to 125°C operating temperature. The primary difference is an extended lower supply voltage limit of 1.2V compared to 2V for the SN74LVC138AQDREP.

Q: Can I use the 74LCX138MX as a substitute in all applications?

A: The 74LCX138MX from Fairchild Semiconductor is functionally equivalent but operates to a maximum temperature of 85°C. It is suitable for applications not requiring operation above 85°C. All other electrical parameters, including circuit configuration, output current, supply voltage range, and package format, are identical to the SN74LVC138AQDREP.

Q: Are all substitute parts ROHS3 compliant?

A: The SN74LVC138AQDREP, SN74LVC138AQDRG4Q1, SN74LVC138AQDRQ1, MC74LCX138DR2G, and 74LVC138AD,118 are all ROHS3 compliant. The 74LCX138MX from Fairchild Semiconductor does not list RoHS status in the provided specifications.

Q: What packaging considerations apply when substituting these parts?

A: All listed substitute parts use the 16-SOIC (0.154", 3.90mm Width) surface mount package, ensuring direct physical compatibility on printed circuit boards. No PCB layout modifications are required when substituting between these devices.