74LVC138AD,112 Equivalent & Substitute Parts

Part Overview

The 74LVC138AD,112 is a 1 x 3:8 decoder/demultiplexer logic integrated circuit manufactured by Nexperia USA Inc. in a 16-SOIC surface mount package. This part is classified as obsolete, which necessitates identification of functionally equivalent alternatives for new designs and ongoing production requirements. The decoder/demultiplexer function remains consistent across qualified substitute parts, enabling direct replacement where electrical and mechanical parameters align.

Key Parameters

Parameter	Value
Manufacturer Part Number	74LVC138AD,112
Manufacturer	Nexperia USA Inc.
Type	Decoder/Demultiplexer
Circuit Configuration	1 x 3:8
Current - Output High, Low	24mA, 24mA
Voltage Supply	1.2V ~ 3.6V
Operating Temperature	-40°C ~ 125°C
Package / Case	16-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the 74LVC138AD,112 is determined by the following critical parameters:

Functional Equivalence: All substitute parts maintain the 1 x 3:8 decoder/demultiplexer circuit configuration with identical output current specifications (24mA high, 24mA low).

Package Compatibility: Substitute parts must use the 16-SOIC surface mount package with 0.154" (3.90mm) width to ensure PCB layout compatibility.

Electrical Parameters: Output current drive capability (24mA) and single supply voltage operation are mandatory. Voltage supply range variations are acceptable where the substitute range encompasses the design operating point.

Operating Temperature Range: The main part specifies -40°C to 125°C. Substitutes with -40°C to 85°C ranges are acceptable for applications not requiring the extended upper temperature limit.

Compliance Requirements: RoHS3 compliance and MSL rating of 1 (Unlimited) are preferred for manufacturing consistency.

Parameter Comparison

Part Number	Manufacturer	Voltage Supply	Operating Temperature	Output Current (High/Low)	Package	Product Status	RoHS Status
74LVC138AD,112	Nexperia USA Inc.	1.2V ~ 3.6V	-40°C ~ 125°C	24mA / 24mA	16-SOIC (0.154")	Obsolete	ROHS3 Compliant
74LVC138AD,118	Nexperia USA Inc.	1.2V ~ 3.6V	-40°C ~ 125°C	24mA / 24mA	16-SOIC (0.154")	Active	ROHS3 Compliant
SN74LVC138ADT	Texas Instruments	1.65V ~ 3.6V	-40°C ~ 85°C	24mA / 24mA	16-SOIC (0.154")	Active	ROHS3 Compliant
SN74LVC138ADR	Texas Instruments	1.65V ~ 3.6V	-40°C ~ 85°C	24mA / 24mA	16-SOIC (0.154")	Active	ROHS3 Compliant
SN74LVC138AD	Texas Instruments	1.65V ~ 3.6V	-40°C ~ 85°C	24mA / 24mA	16-SOIC (0.154")	Active	ROHS3 Compliant
SN74LVC138AQDREP	Texas Instruments	2V ~ 3.6V	-40°C ~ 125°C	24mA / 24mA	16-SOIC (0.154")	Active	ROHS3 Compliant
SN74LVC138AQDRG4Q1	Texas Instruments	2V ~ 3.6V	-40°C ~ 125°C	24mA / 24mA	16-SOIC (0.154")	Active	ROHS3 Compliant
74LCX138MX	Fairchild Semiconductor	2V ~ 3.6V	-40°C ~ 85°C	24mA / 24mA	16-SOIC (0.154")	Active	Not specified
MC74LCX138DR2G	onsemi	2V ~ 3.6V	-40°C ~ 85°C	24mA / 24mA	16-SOIC (0.154")	Active	ROHS3 Compliant
SN74LVC138ANS	Texas Instruments	1.65V ~ 3.6V	-40°C ~ 85°C	24mA / 24mA	16-SOIC (0.209")	Active	Not applicable
SN74LVC138ANSR	Texas Instruments	1.65V ~ 3.6V	-40°C ~ 85°C	24mA / 24mA	16-SOIC (0.209")	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: 74LVC138AD,118 (Nexperia USA Inc.) is the direct functional equivalent with identical electrical specifications and extended temperature range (-40°C to 125°C). This part maintains the same voltage supply range (1.2V to 3.6V) and is currently in active production status with ROHS3 compliance.

Secondary Recommendations for Extended Temperature Applications: SN74LVC138AQDREP and SN74LVC138AQDRG4Q1 (Texas Instruments) both support the full -40°C to 125°C operating range with active product status. The AQDRG4Q1 variant includes AEC-Q100 automotive qualification for applications requiring automotive-grade components.

Standard Industrial Applications: SN74LVC138ADT, SN74LVC138ADR, and SN74LVC138AD (Texas Instruments) are suitable for applications with -40°C to 85°C requirements. These parts are in active production with high inventory availability and ROHS3 compliance.

Alternative Manufacturers: 74LCX138MX (Fairchild Semiconductor) and MC74LCX138DR2G (onsemi) provide functional equivalence with 2V to 3.6V supply range and -40°C to 85°C operating temperature. These are appropriate where supply chain diversification is required.

Package Consideration: SN74LVC138ANS and SN74LVC138ANSR use a wider 16-SOIC package (0.209" width) and are not recommended for direct PCB replacement of the 74LVC138AD,112 due to physical incompatibility.

Frequently Asked Questions (FAQ)

Q: Can the 74LVC138AD,112 be replaced with any active 74LVC138 variant?

A: No. Direct replacement requires matching the 16-SOIC package with 0.154" (3.90mm) width. Parts using the wider 0.209" package (such as SN74LVC138ANS) are not physically compatible with existing PCB layouts.

Q: What is the minimum voltage supply requirement for substitute parts?

A: The original part specifies 1.2V minimum. Texas Instruments variants (SN74LVC138 series) specify 1.65V minimum, while Fairchild and onsemi variants specify 2V minimum. Verify your design operating voltage against the substitute part's minimum specification.

Q: Are all substitute parts RoHS3 compliant?

A: Most active substitutes are ROHS3 compliant. The 74LCX138MX (Fairchild) does not specify RoHS status. SN74LVC138ANS is marked as "Not applicable" for RoHS. Confirm compliance requirements for your application before selection.

Q: What is the difference between packaging codes like ADT, ADR, and AD?

A: These suffixes indicate packaging format: ADT = Tape & Reel, ADR = Cut Tape & Digi-Reel, AD = Tube. The electrical specifications remain identical; packaging choice depends on your procurement and assembly process requirements.

Q: Can I use SN74LVC138AQDRG4Q1 in non-automotive applications?

A: Yes. The AEC-Q100 automotive qualification indicates additional testing and reliability assurance. This part is suitable for any application requiring the specified electrical and temperature parameters, regardless of automotive use.

Q: What is the significance of the extended temperature range (-40°C to 125°C)?

A: The extended range accommodates applications in high-temperature environments or with stringent thermal cycling requirements. If your application operates within -40°C to 85°C, standard industrial variants are appropriate and typically offer better availability.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message