74LCX138MTC Equivalent & Substitute Parts

Part Overview

The 74LCX138MTC is a decoder/demultiplexer logic integrated circuit manufactured by onsemi in a 16-TSSOP surface mount package. This device implements a 1 x 3:8 decoder/demultiplexer function with single supply operation. The part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Function	Decoder/Demultiplexer 1 x 3:8
Output Current (High/Low)	24mA / 24mA
Supply Voltage Range	2V ~ 3.6V
Operating Temperature	-40°C ~ 85°C
Package Type	16-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the 74LCX138MTC is determined by the following critical parameters:

Functional equivalence: Decoder/Demultiplexer 1 x 3:8 circuit configuration
Output current capability: 24mA high and low output current
Supply voltage compatibility: Minimum 2V operation required
Package compatibility: 16-TSSOP surface mount package
Thermal performance: Operating temperature range of at least -40°C to 85°C
Compliance standards: ROHS3 compliance and MSL 1 rating

Substitute parts are grouped into two categories:

Parametric Equivalents maintain identical electrical specifications and package form factor, providing direct replacement capability.

Similar Parts share the core decoder/demultiplexer function and package type but may offer extended operating temperature ranges, alternative supply voltage ranges, or different packaging options (tape & reel, cut tape, tube). These parts are functionally compatible but require verification of specific application requirements.

Parameter Comparison

Part Number	Manufacturer	Series	Supply Voltage	Operating Temp	Package	Product Status	Output Current (mA)
74LCX138MTC	onsemi	74LCX	2V ~ 3.6V	-40°C ~ 85°C	16-TSSOP	Obsolete	24/24
MC74LCX138DTG	onsemi	74LCX	2V ~ 3.6V	-40°C ~ 85°C	16-TSSOP	Active	24/24
74LVC138APW,118	Nexperia USA Inc.	74LVC	1.2V ~ 3.6V	-40°C ~ 125°C	16-TSSOP	Active	24/24
CLVC138AQPWRG4Q1	Texas Instruments	74LVC	2V ~ 3.6V	-40°C ~ 125°C	16-TSSOP	Active	24/24
SN74LVC138ADBR	Texas Instruments	74LVC	1.65V ~ 3.6V	-40°C ~ 85°C	16-SSOP	Active	24/24
SN74LVC138ADGVR	Texas Instruments	74LVC	1.65V ~ 3.6V	-40°C ~ 85°C	16-TVSOP	Active	24/24
SN74LVC138AMPWTEP	Texas Instruments	74LVC	2V ~ 3.6V	-55°C ~ 125°C	16-TSSOP	Active	24/24
SN74LVC138APW	Texas Instruments	74LVC	1.65V ~ 3.6V	-40°C ~ 85°C	16-TSSOP	Active	24/24
SN74LVC138APWG4	Texas Instruments	74LVC	1.65V ~ 3.6V	-40°C ~ 85°C	16-TSSOP	Discontinued at DiGi Electronics	24/24
SN74LVC138APWR	Texas Instruments	74LVC	1.65V ~ 3.6V	-40°C ~ 85°C	16-TSSOP	Active	24/24
SN74LVC138APWT	Texas Instruments	74LVC	1.65V ~ 3.6V	-40°C ~ 85°C	16-TSSOP	Active	24/24

Engineering Selection Recommendations

Primary Recommendation: MC74LCX138DTG

The MC74LCX138DTG from onsemi is the direct parametric equivalent to the 74LCX138MTC. It maintains identical electrical specifications, supply voltage range, operating temperature range, and 16-TSSOP package configuration. This part is currently in active production status, ensuring long-term availability and supply chain stability.

Alternative Recommendations:

For applications requiring extended operating temperature range (-55°C to 125°C), the SN74LVC138AMPWTEP from Texas Instruments provides enhanced thermal performance while maintaining the 16-TSSOP package and 2V to 3.6V supply voltage compatibility.

For applications with lower minimum supply voltage requirements (1.65V), multiple Texas Instruments options are available: SN74LVC138APW, SN74LVC138APWR, and SN74LVC138APWT. These parts are actively produced and widely available.

The CLVC138AQPWRG4Q1 from Texas Instruments is qualified to AEC-Q100 automotive standards and suitable for automotive applications requiring decoder/demultiplexer functionality.

All recommended substitutes maintain ROHS3 compliance and MSL 1 moisture sensitivity rating, ensuring compatibility with standard manufacturing and storage requirements.

Frequently Asked Questions (FAQ)

Q: Can the MC74LCX138DTG directly replace the 74LCX138MTC?

A: Yes. The MC74LCX138DTG is a parametric equivalent with identical supply voltage range (2V to 3.6V), operating temperature range (-40°C to 85°C), output current specifications (24mA), and 16-TSSOP package configuration. No circuit modifications are required.

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

A: Both series implement the same decoder/demultiplexer function with identical output current ratings. The 74LVC series from Texas Instruments and Nexperia typically offers lower minimum supply voltage (1.65V vs 2V) and extended operating temperature ranges in some variants. The 74LCX series is primarily available from onsemi.

Q: Are there package alternatives to 16-TSSOP?

A: Yes. The SN74LVC138ADBR uses a 16-SSOP package (0.209" width vs 0.173"), and the SN74LVC138ADGVR uses a 16-TVSOP package. These alternatives maintain electrical compatibility but require PCB layout modifications due to different pin spacing and package dimensions.

Q: Which substitute part has the widest operating temperature range?

A: The SN74LVC138AMPWTEP operates from -55°C to 125°C, providing the widest temperature coverage. This part is suitable for industrial and extended-temperature applications.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and MSL 1 moisture sensitivity rating, matching the original 74LCX138MTC specifications.

Q: What packaging options are available for the substitute parts?

A: Substitute parts are available in multiple packaging formats: tube, tape & reel (TR), and cut tape (CT) with digi-reel options. Packaging selection depends on procurement volume and assembly line requirements. Verify specific packaging availability with your supplier.

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