SN74LVC138APWRG4 Equivalent & Substitute Parts

Part Overview

The SN74LVC138APWRG4 is a decoder/demultiplexer logic integrated circuit manufactured by Texas Instruments, featuring a 1 x 3:8 configuration in a 16-TSSOP surface mount package. This part is discontinued at DiGi Electronics, necessitating identification of equivalent and substitute components that maintain functional and electrical compatibility for ongoing production and repair applications.

Key Parameters

Parameter	Value
Type	Decoder/Demultiplexer
Circuit Configuration	1 x 3:8
Output Current (High/Low)	24mA / 24mA
Voltage Supply	Single Supply
Operating Temperature Range	-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 eligibility for the SN74LVC138APWRG4 is determined by the following critical parameters:

Functional Configuration: Decoder/Demultiplexer type with 1 x 3:8 circuit topology
Output Characteristics: 24mA output current capability (both high and low states)
Package Compatibility: 16-TSSOP surface mount package with identical physical dimensions
Supply Voltage Range: Single supply operation within compatible voltage specifications
Operating Temperature: Minimum -40°C to 85°C range support
Regulatory Compliance: ROHS3 compliance and MSL 1 rating

Substitute parts are grouped into three categories based on manufacturer and voltage supply specifications:

Texas Instruments Direct Equivalents (SN74LVC138 series): Identical voltage supply range (1.65V ~ 3.6V) with matching electrical characteristics and active product status.

onsemi Cross-Manufacturer Substitutes (74LCX138 series): Functionally equivalent with slightly narrower voltage supply range (2V ~ 3.6V) but identical output current and package specifications.

Nexperia Alternative (74LVC138APW,118): Extended voltage supply range (1.2V ~ 3.6V) and expanded operating temperature range (-40°C ~ 125°C) with active product status.

Parameter Comparison

Part Number	Manufacturer	Series	Voltage Supply	Operating Temp	Output Current (H/L)	Package	Status	Inventory
SN74LVC138APWRG4	Texas Instruments	74LVC	1.65V ~ 3.6V	-40°C ~ 85°C	24mA / 24mA	16-TSSOP	Discontinued	759 Pcs
SN74LVC138APWR	Texas Instruments	74LVC	1.65V ~ 3.6V	-40°C ~ 85°C	24mA / 24mA	16-TSSOP	Active	4100 Pcs
SN74LVC138APWT	Texas Instruments	74LVC	1.65V ~ 3.6V	-40°C ~ 85°C	24mA / 24mA	16-TSSOP	Active	5646 Pcs
74LCX138MTCX	onsemi	74LCX	2V ~ 3.6V	-40°C ~ 85°C	24mA / 24mA	16-TSSOP	Active	10700 Pcs
MC74LCX138DTR2G	onsemi	74LCX	2V ~ 3.6V	-40°C ~ 85°C	24mA / 24mA	16-TSSOP	Active	3300 Pcs
MC74LCX138DTG	onsemi	74LCX	2V ~ 3.6V	-40°C ~ 85°C	24mA / 24mA	16-TSSOP	Active	4175 Pcs
74LVC138APW,118	Nexperia USA Inc.	74LVC	1.2V ~ 3.6V	-40°C ~ 125°C	24mA / 24mA	16-TSSOP	Active	13011 Pcs

Engineering Selection Recommendations

Primary Recommendation: SN74LVC138APWR or SN74LVC138APWT (Texas Instruments). These parts maintain identical electrical specifications and voltage supply range as the original SN74LVC138APWRG4, ensuring direct functional compatibility. Both are active products with substantial inventory availability. Selection between these two variants depends on packaging requirements: SN74LVC138APWR is supplied in Cut Tape and Digi-Reel format, while SN74LVC138APWT is supplied in Tape & Reel format.

Secondary Recommendation: 74LCX138MTCX or MC74LCX138DTR2G (onsemi). These cross-manufacturer substitutes provide equivalent functional performance with identical output current and package specifications. The voltage supply range is narrower (2V ~ 3.6V minimum), requiring verification that circuit design does not require operation below 2V. Both parts are active with strong inventory levels.

Extended Temperature Alternative: 74LVC138APW,118 (Nexperia USA Inc.). This part offers the widest voltage supply range (1.2V ~ 3.6V) and extended operating temperature range (-40°C ~ 125°C), providing additional design margin for applications requiring lower supply voltages or higher temperature operation. This part is active with the highest inventory availability.

All substitute parts maintain ROHS3 compliance, MSL 1 rating, and identical 16-TSSOP package specifications, ensuring mechanical and regulatory compatibility.

Frequently Asked Questions (FAQ)

Q: Can the SN74LVC138APWR directly replace the SN74LVC138APWRG4?

A: Yes. The SN74LVC138APWR is a direct parametric equivalent with identical voltage supply range (1.65V ~ 3.6V), output current specifications (24mA/24mA), operating temperature range (-40°C ~ 85°C), and 16-TSSOP package. The only difference is packaging format (Cut Tape/Digi-Reel versus the original's format). Electrical and functional compatibility is complete.

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

A: The SN74LVC138 series operates from 1.65V ~ 3.6V, while the onsemi 74LCX138 series operates from 2V ~ 3.6V. The 74LCX series has a higher minimum voltage specification. If your circuit operates at voltages below 2V, use the 74LVC series. For circuits operating at 2V or above, both series are compatible.

Q: Are all substitute parts available in the same 16-TSSOP package?

A: Yes. All listed substitute parts use the identical 16-TSSOP surface mount package (0.173", 4.40mm width). Physical footprint compatibility is guaranteed across all substitutes.

Q: What packaging options are available for these substitutes?

A: Texas Instruments parts (SN74LVC138APWR, SN74LVC138APWT) are available in Cut Tape/Digi-Reel and Tape & Reel formats respectively. onsemi parts (74LCX138MTCX, MC74LCX138DTR2G, MC74LCX138DTG) are available in Cut Tape/Digi-Reel, Tape & Reel, and Tube formats. Nexperia part (74LVC138APW,118) is available in Cut Tape/Digi-Reel format. Select based on your assembly process requirements.

Q: Is the Nexperia 74LVC138APW,118 compatible with designs requiring extended temperature operation?

A: Yes. The Nexperia part supports -40°C ~ 125°C operating temperature, compared to -40°C ~ 85°C for other substitutes. If your application requires operation above 85°C, this part provides the necessary temperature margin. All other electrical specifications remain compatible.

Q: Do all parts maintain the same RoHS and MSL compliance?

A: Yes. All substitute parts are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity level, matching the original SN74LVC138APWRG4 specifications.

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