74LVC138ADB,118 Equivalent & Substitute Parts

Part Overview

The 74LVC138ADB,118 is a decoder/demultiplexer logic integrated circuit manufactured by Nexperia USA Inc. in the 74LVC series. This device features a 1 x 3:8 decoder configuration in a 16-SSOP package and operates across a supply voltage range of 1.2V to 3.6V with output currents of 24mA for both high and low states. The part is currently listed as obsolete, making identification of equivalent and substitute parts essential for ongoing design support and production continuity.

Key Parameters

Parameter	Specification
Base Product Number	74LVC138
Type	Decoder/Demultiplexer
Circuit Configuration	1 x 3:8
Independent Circuits	1
Current - Output High/Low	24mA / 24mA
Voltage Supply Source	Single Supply
Voltage - Supply Range	1.2V ~ 3.6V
Operating Temperature	-40°C ~ 125°C
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the 74LVC138ADB,118 is determined by strict equivalence in the following parameters:

Base product number (74LVC138)
Decoder/demultiplexer type with 1 x 3:8 circuit configuration
Single independent circuit
Output current capability (24mA high/low)
Single supply voltage operation
Surface mount mounting type
RoHS3 compliance and MSL 1 rating

Substitute parts are grouped by package type (16-SSOP, 16-TSSOP, 16-TVSOP) and product status (active vs. discontinued). Voltage supply range and operating temperature may vary between substitutes while maintaining functional equivalence. Packaging format and supplier device package designation determine mechanical and thermal compatibility.

Parameter Comparison

Part Number	Manufacturer	Package / Case	Voltage - Supply	Operating Temperature	Product Status	Current - Output High/Low
74LVC138ADB,118	Nexperia USA Inc.	16-SSOP (0.209", 5.30mm)	1.2V ~ 3.6V	-40°C ~ 125°C	Obsolete	24mA / 24mA
74LVC138APW,118	Nexperia USA Inc.	16-TSSOP (0.173", 4.40mm)	1.2V ~ 3.6V	-40°C ~ 125°C	Active	24mA / 24mA
SN74LVC138ADBR	Texas Instruments	16-SSOP (0.209", 5.30mm)	1.65V ~ 3.6V	-40°C ~ 85°C	Active	24mA / 24mA
SN74LVC138ADGVR	Texas Instruments	16-TFSOP (0.173", 4.40mm)	1.65V ~ 3.6V	-40°C ~ 85°C	Active	24mA / 24mA
SN74LVC138APW	Texas Instruments	16-TSSOP (0.173", 4.40mm)	1.65V ~ 3.6V	-40°C ~ 85°C	Active	24mA / 24mA
SN74LVC138APWG4	Texas Instruments	16-TSSOP (0.173", 4.40mm)	1.65V ~ 3.6V	-40°C ~ 85°C	Discontinued at DiGi Electronics	24mA / 24mA
SN74LVC138APWT	Texas Instruments	16-TSSOP (0.173", 4.40mm)	1.65V ~ 3.6V	-40°C ~ 85°C	Active	24mA / 24mA
SN74LVC138AQPWRQ1	Texas Instruments	16-TSSOP (0.173", 4.40mm)	2V ~ 3.6V	-40°C ~ 125°C	Active	24mA / 24mA

Engineering Selection Recommendations

For direct replacement of the obsolete 74LVC138ADB,118 in existing designs, the 74LVC138APW,118 from Nexperia USA Inc. provides identical electrical specifications and maintains the same supply voltage range (1.2V ~ 3.6V) and operating temperature range (-40°C ~ 125°C). This part differs only in package format (16-TSSOP vs. 16-SSOP) and is currently in active production status.

For designs requiring the same 16-SSOP package footprint, the SN74LVC138ADBR from Texas Instruments offers functional equivalence with a narrower supply voltage range (1.65V ~ 3.6V) and reduced operating temperature range (-40°C ~ 85°C). This part is actively produced and RoHS3 compliant.

The SN74LVC138AQPWRQ1 variant includes automotive-grade qualification (AEC-Q100) with operating temperature range of -40°C ~ 125°C, suitable for applications requiring automotive reliability standards. This part operates within a 2V ~ 3.6V supply range.

All substitute parts maintain RoHS3 compliance, MSL 1 rating, and identical functional decoder/demultiplexer performance. Selection should be based on package compatibility with existing PCB layouts and voltage supply constraints of the target application.

Frequently Asked Questions (FAQ)

Q: Can the 74LVC138ADB,118 be replaced with any 74LVC138 variant?

A: Substitution is limited to parts sharing the base product number 74LVC138 with identical 1 x 3:8 decoder configuration, 24mA output current capability, and single supply operation. Package type, voltage range, and temperature range may differ based on application requirements.

Q: What is the primary difference between 16-SSOP and 16-TSSOP packages?

A: The 16-SSOP package has a body width of 0.209" (5.30mm), while the 16-TSSOP package has a body width of 0.173" (4.40mm). These are not pin-compatible and require different PCB footprints. Verify PCB layout compatibility before substitution.

Q: Is the SN74LVC138AQPWRQ1 suitable for non-automotive applications?

A: Yes. The SN74LVC138AQPWRQ1 meets automotive qualification standards but functions identically to standard industrial-grade variants. It may be used in non-automotive designs where the extended temperature range (-40°C ~ 125°C) and AEC-Q100 qualification provide additional reliability assurance.

Q: What is the minimum supply voltage difference between the main part and Texas Instruments substitutes?

A: The 74LVC138ADB,118 operates from 1.2V minimum, while most Texas Instruments equivalents (SN74LVC138ADBR, SN74LVC138APW, SN74LVC138APWT) require 1.65V minimum. The SN74LVC138AQPWRQ1 requires 2V minimum. Designs operating below 1.65V must use the Nexperia variants.

Q: Are all listed parts RoHS3 compliant?

A: Yes. All parts listed maintain RoHS3 compliance and MSL 1 (unlimited) moisture sensitivity rating, ensuring compatibility with standard manufacturing and storage requirements.

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