74LVC138ADB,112 Equivalent & Substitute Parts

Part Overview

The 74LVC138ADB,112 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 surface mount package. The part is currently listed as obsolete, making identification of suitable substitute components necessary for ongoing design support and production continuity.

Substiute Parts

74LVC138ADB,112

Nexperia USA Inc.In Stock: 96474LVC138ADB,112 Datasheet

Current PartRFQ

74LVC138APW,118

Nexperia USA Inc.In Stock: 1302574LVC138APW,118 Datasheet

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SN74LVC138ADBR

Texas InstrumentsIn Stock: 5238SN74LVC138ADBR Datasheet

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SN74LVC138APWG4

Texas InstrumentsIn Stock: 1146SN74LVC138APWG4 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 74LVC138ADB,112 are identified based on functional equivalence within the 74LVC138 decoder/demultiplexer family. The critical parameters determining substitutability are:

• Base product number (74LVC138)
• Decoder circuit configuration (1 x 3:8)
• Output current capability (24mA / 24mA)
• Voltage supply range compatibility
• Operating temperature range
• RoHS3 compliance and MSL rating

Substitutes are grouped into two categories based on package type: 16-SSOP (same footprint as main part) and 16-TSSOP (alternative surface mount package with different pitch and width). Parts within each package category maintain electrical equivalence while differing in physical form factor and manufacturer source.

Parameter Comparison

Engineering Selection Recommendations

Direct Footprint Replacement (16-SSOP Package):

SN74LVC138ADBR from Texas Instruments provides identical 16-SSOP package compatibility with the original 74LVC138ADB,112. This part maintains active product status and full RoHS3 compliance. The voltage supply range narrows to 1.65V ~ 3.6V and operating temperature range reduces to -40°C ~ 85°C compared to the original specification. Selection of this substitute is appropriate when PCB layout and existing component placement require preservation of the original SSOP footprint.

Alternative Package Option (16-TSSOP Package):

74LVC138APW,118 from Nexperia USA Inc. offers active product status with identical electrical specifications to the original part, including the extended voltage supply range (1.2V ~ 3.6V) and full operating temperature range (-40°C ~ 125°C). This part requires PCB redesign to accommodate the 16-TSSOP package footprint (0.173" width versus 0.209" for SSOP). Selection is appropriate when design flexibility permits package transition and extended environmental specifications are required.

SN74LVC138APWG4 from Texas Instruments provides 16-TSSOP package compatibility but is discontinued at DiGi Electronics. This part is not recommended for new designs due to limited availability and discontinued status.

Compliance Considerations:

All substitute parts maintain ROHS3 compliance, MSL Level 1 rating, and equivalent functional performance within the 74LVC138 decoder/demultiplexer family. Selection should prioritize parts with active product status to ensure long-term supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can the 74LVC138APW,118 directly replace the 74LVC138ADB,112 on the existing PCB?

A: No. The 74LVC138APW,118 uses a 16-TSSOP package (0.173" width) while the original part uses 16-SSOP (0.209" width). These packages have different pin pitches and footprints. PCB redesign is required for this substitution.

Q: What is the key difference between the Nexperia and Texas Instruments versions?

A: The Nexperia 74LVC138APW,118 maintains the original voltage supply range (1.2V ~ 3.6V) and operating temperature range (-40°C ~ 125°C). Texas Instruments versions (SN74LVC138ADBR and SN74LVC138APWG4) have narrower specifications: voltage supply 1.65V ~ 3.6V and operating temperature -40°C ~ 85°C. Selection depends on whether your application requires the extended environmental specifications.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and MSL Level 1 rating, matching the original part's environmental certifications.

Q: Which substitute should I choose for a new design?

A: For new designs, select 74LVC138APW,118 (Nexperia, active status, 16-TSSOP) or SN74LVC138ADBR (Texas Instruments, active status, 16-SSOP). Both offer active product status and full compliance. Choose based on your package preference and environmental specification requirements.

Q: Is the SN74LVC138APWG4 suitable for production use?

A: No. This part is discontinued at DiGi Electronics and should not be selected for new designs or ongoing production due to limited availability.