MM74HC138MTC Equivalent & Substitute Parts

Part Overview

The MM74HC138MTC is a 1 x 3:8 decoder/demultiplexer logic IC manufactured by onsemi in 16-TSSOP surface mount packaging. This part operates across a 2V to 6V supply range with output currents of 5.2mA (high and low). The MM74HC138MTC is classified as obsolete, making equivalent and substitute parts necessary for ongoing production and design requirements. Substitute parts maintain the same functional circuit topology and electrical characteristics while offering improved availability and product status options.

Key Parameters

Parameter	Value
Type	Decoder/Demultiplexer
Circuit Configuration	1 x 3:8
Output Current (High/Low)	5.2mA / 5.2mA
Supply Voltage Range	2V ~ 6V
Operating Temperature	-40°C ~ 85°C
Mounting Type	Surface Mount
Package	16-TSSOP (0.173", 4.40mm Width)
Series	74HC
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following criteria:

Primary Substitution Parameters:

Circuit configuration: 1 x 3:8 decoder/demultiplexer topology
Output current specifications: 5.2mA (high and low)
Supply voltage range: 2V ~ 6V minimum compatibility
Mounting type: Surface mount only
Package type: 16-TSSOP or 16-SSOP (mechanically compatible)
Series classification: 74HC logic family

Secondary Compatibility Factors:

Operating temperature range (must meet or exceed application requirements)
RoHS and REACH compliance status
Moisture sensitivity level (MSL 1 or MSL 3 acceptable for standard applications)

Substitute parts are grouped by package type (16-TSSOP primary, 16-SSOP alternative) and manufacturer. All listed substitutes maintain identical functional performance and electrical specifications within the defined parameter set.

Parameter Comparison

Part Number	Manufacturer	Product Status	Package	Temp Range	Supply Voltage	Output Current	MSL
MM74HC138MTC	onsemi	Obsolete	16-TSSOP	-40°C ~ 85°C	2V ~ 6V	5.2mA / 5.2mA	1
MC74HC138ADTR2G	onsemi	Active	16-TSSOP	-55°C ~ 125°C	2V ~ 6V	5.2mA / 5.2mA	1
NLV74HC138ADTR2G	onsemi	Obsolete	16-TSSOP	-55°C ~ 125°C	2V ~ 6V	5.2mA / 5.2mA	1
74HC138PW,118	Nexperia USA Inc.	Active	16-TSSOP	-40°C ~ 125°C	2V ~ 6V	5.2mA / 5.2mA	1
SN74HC138APWR	Texas Instruments	Active	16-TSSOP	-40°C ~ 85°C	2V ~ 6V	5.2mA / 5.2mA	1
SN74HC138DBR	Texas Instruments	Active	16-SSOP	-40°C ~ 85°C	2V ~ 6V	5.2mA / 5.2mA	1
SN74HC138PWR	Texas Instruments	Active	16-TSSOP	-40°C ~ 85°C	2V ~ 6V	5.2mA / 5.2mA	1
SN74HC138PWT	Texas Instruments	Discontinued at DiGi Electronics	16-TSSOP	-40°C ~ 85°C	2V ~ 6V	5.2mA / 5.2mA	1
SN74HC138QPWRG4Q1	Texas Instruments	Active	16-TSSOP	-40°C ~ 125°C	2V ~ 6V	5.2mA / 5.2mA	1
SN74HC138QPWRQ1	Texas Instruments	Active	16-TSSOP	-40°C ~ 125°C	2V ~ 6V	5.2mA / 5.2mA	3
SN74HC138PW	Texas Instruments	Discontinued at DiGi Electronics	16-TSSOP	-40°C ~ 85°C	2V ~ 6V	5.2mA / 5.2mA	1

Engineering Selection Recommendations

For Active Product Status Priority: Select MC74HC138ADTR2G (onsemi), 74HC138PW,118 (Nexperia), SN74HC138APWR, SN74HC138PWR, SN74HC138QPWRG4Q1, or SN74HC138QPWRQ1 (Texas Instruments). These parts maintain full production status and ensure long-term supply chain stability.

For Extended Temperature Range Applications: MC74HC138ADTR2G, NLV74HC138ADTR2G, 74HC138PW,118, SN74HC138QPWRG4Q1, and SN74HC138QPWRQ1 support -55°C to 125°C or -40°C to 125°C operating ranges, exceeding the original MM74HC138MTC specification of -40°C to 85°C.

For Automotive Applications: SN74HC138QPWRG4Q1 and SN74HC138QPWRQ1 carry AEC-Q100 automotive qualification and are suitable for automotive-grade designs.

For Package Compatibility: 16-TSSOP packages (0.173", 4.40mm width) are preferred for direct PCB layout compatibility. SN74HC138DBR uses 16-SSOP (0.209", 5.30mm width) and requires PCB footprint verification before selection.

For Moisture Sensitivity Considerations: All listed parts carry MSL 1 (unlimited) or MSL 3 (168 hours) ratings. MSL 1 parts (MC74HC138ADTR2G, NLV74HC138ADTR2G, 74HC138PW,118, SN74HC138APWR, SN74HC138DBR, SN74HC138PWR, SN74HC138PWT, SN74HC138QPWRG4Q1, SN74HC138PW) require no special moisture handling. SN74HC138QPWRQ1 (MSL 3) requires controlled storage conditions.

Frequently Asked Questions (FAQ)

Q: Can I directly replace MM74HC138MTC with any of the listed substitutes? A: Direct replacement is possible only with parts sharing identical package type (16-TSSOP) and electrical specifications. MC74HC138ADTR2G, 74HC138PW,118, SN74HC138APWR, SN74HC138PWR, SN74HC138QPWRG4Q1, SN74HC138QPWRQ1, and SN74HC138PW are direct pin-compatible replacements. SN74HC138DBR uses 16-SSOP packaging and requires PCB footprint verification.

Q: What is the difference between 16-TSSOP and 16-SSOP packages? A: 16-TSSOP measures 0.173" (4.40mm) width, while 16-SSOP measures 0.209" (5.30mm) width. PCB footprints differ and are not interchangeable without layout modification. Verify your PCB design before selecting SN74HC138DBR.

Q: Why are some substitutes listed as obsolete or discontinued? A: NLV74HC138ADTR2G and SN74HC138PWT are obsolete or discontinued at DiGi Electronics but may remain available through alternative distributors. For new designs, prioritize active status parts to ensure long-term availability.

Q: Does operating temperature range affect substitution eligibility? A: Operating temperature range does not prevent substitution if the substitute meets or exceeds your application requirements. If your design operates within -40°C to 85°C, all listed parts are suitable. Extended range parts (-55°C to 125°C) provide additional margin for demanding environments.

Q: Are automotive-qualified parts necessary for non-automotive applications? A: Automotive-qualified parts (SN74HC138QPWRG4Q1, SN74HC138QPWRQ1) meet stricter reliability and traceability standards but are not required for standard industrial or consumer applications. Selection depends on your application requirements and quality standards.

Q: What does MSL rating mean for component selection? A: Moisture Sensitivity Level (MSL) indicates how long a component can be exposed to ambient humidity before soldering. MSL 1 parts have unlimited shelf life under standard conditions. MSL 3 parts require controlled storage (168 hours maximum at specified humidity). For standard manufacturing, MSL 1 parts simplify logistics.

Q: Which substitute offers the best long-term availability? A: MC74HC138ADTR2G (onsemi) and SN74HC138QPWRG4Q1 (Texas Instruments) are active production parts from established manufacturers with strong supply chain presence. Both are suitable for new designs requiring long-term component availability.

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