SN74LVC138ADRG4 Equivalent & Substitute Parts

Part Overview

The SN74LVC138ADRG4 is a decoder/demultiplexer integrated circuit manufactured by Texas Instruments, featuring a 1 x 3:8 configuration in a 16-SOIC package. This part is currently discontinued at DiGi Electronics, making equivalent substitute parts necessary for ongoing design requirements and production needs. The device operates as a single-supply logic decoder with output capabilities of 24mA high and low current, suitable for address decoding and demultiplexing applications in digital systems.

Key Parameters

Parameter	Value
Manufacturer Part Number	SN74LVC138ADRG4
Manufacturer	Texas Instruments
Type	Decoder/Demultiplexer
Circuit Configuration	1 x 3:8
Package / Case	16-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Voltage Supply Range	1.65V ~ 3.6V
Current - Output High, Low	24mA, 24mA
Operating Temperature	-40°C ~ 85°C
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)
Product Status	Discontinued at DiGi Electronics

Substitute Part Grouping Explanation

Substitution for the SN74LVC138ADRG4 is determined by the following critical parameters: decoder/demultiplexer type with 1 x 3:8 circuit configuration, 16-SOIC surface mount package, single supply voltage operation, 24mA output current capability, and operating temperature range of -40°C to 85°C. Parts meeting these specifications across different manufacturers and packaging formats are considered parametric equivalents. The substitute parts are grouped into three categories: parametric equivalents from Texas Instruments with different packaging options, direct manufacturer alternatives from onsemi and Fairchild Semiconductor, and manufacturer-recommended alternatives from Nexperia USA Inc.

Parameter Comparison

Parameter	SN74LVC138ADRG4	SN74LVC138ADR	SN74LVC138ADT	MC74LCX138DR2G	74LCX138MX	74LVC138AD,118
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments	onsemi	Fairchild Semiconductor	Nexperia USA Inc.
Type	Decoder/Demultiplexer	Decoder/Demultiplexer	Decoder/Demultiplexer	Decoder/Demultiplexer	Decoder/Demultiplexer	Decoder/Demultiplexer
Circuit Configuration	1 x 3:8	1 x 3:8	1 x 3:8	1 x 3:8	1 x 3:8	1 x 3:8
Package / Case	16-SOIC	16-SOIC	16-SOIC	16-SOIC	16-SOIC	16-SOIC
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Voltage Supply Range	1.65V ~ 3.6V	1.65V ~ 3.6V	1.65V ~ 3.6V	2V ~ 3.6V	2V ~ 3.6V	1.2V ~ 3.6V
Current - Output High, Low	24mA, 24mA	24mA, 24mA	24mA, 24mA	24mA, 24mA	24mA, 24mA	24mA, 24mA
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 125°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	Not specified	ROHS3 Compliant
Product Status	Discontinued	Active	Active	Active	Active	Active

Engineering Selection Recommendations

For direct replacement of the discontinued SN74LVC138ADRG4, the SN74LVC138ADR and SN74LVC138ADT from Texas Instruments are the primary parametric equivalents, differing only in packaging format (Cut Tape & Digi-Reel versus Tape & Reel). Both maintain identical electrical specifications and are currently in active production status with substantial inventory availability.

The MC74LCX138DR2G from onsemi and 74LCX138MX from Fairchild Semiconductor are direct manufacturer alternatives that meet all functional and electrical requirements. These parts operate within a slightly higher minimum voltage range (2V versus 1.65V) but maintain full compatibility with standard 3.3V and 5V logic systems.

The 74LVC138AD,118 from Nexperia USA Inc. offers an extended operating temperature range to 125°C and lower minimum voltage specification of 1.2V, providing additional design margin for temperature-sensitive applications. All substitute parts maintain ROHS3 compliance and identical output current specifications.

Frequently Asked Questions (FAQ)

Q: Can the SN74LVC138ADR directly replace the SN74LVC138ADRG4?

A: Yes. The SN74LVC138ADR is a parametric equivalent with identical electrical specifications, circuit configuration, and package type. The difference is packaging format: the ADR uses Cut Tape & Digi-Reel packaging while the ADRG4 uses a different reel format. Both are suitable for PCB assembly.

Q: What is the difference between the 74LVC and 74LCX series substitutes?

A: The 74LVC series (SN74LVC138ADR, SN74LVC138ADT, 74LVC138AD,118) operates at 1.65V minimum supply voltage, while the 74LCX series (MC74LCX138DR2G, 74LCX138MX) operates at 2V minimum. Both series maintain identical 24mA output current and 16-SOIC packaging. Selection depends on minimum supply voltage requirements in your application.

Q: Are all substitute parts RoHS compliant?

A: Five of the six substitute parts carry explicit ROHS3 compliance certification. The 74LCX138MX from Fairchild Semiconductor does not specify RoHS status in the provided data. Verify RoHS compliance requirements with your procurement specifications before selection.

Q: Does the extended temperature range of the 74LVC138AD,118 affect circuit performance?

A: The 74LVC138AD,118 operates to 125°C versus 85°C for the original part, providing additional thermal margin. This does not affect performance within the original -40°C to 85°C range. Selection of the extended-range part is optional and depends on application thermal requirements.

Q: Can I use these substitutes interchangeably in production?

A: Yes, all listed substitutes are parametrically equivalent and pin-compatible. Verify packaging format compatibility with your assembly process. The primary differences are manufacturer, packaging type (tape & reel variants), and in one case, extended temperature rating. No circuit redesign is required.

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