74VHC138MTC Equivalent & Substitute Parts

Part Overview

The 74VHC138MTC is a decoder/demultiplexer IC manufactured by onsemi, featuring a 1 x 3:8 circuit configuration in a 16-TSSOP surface mount package. This component is classified as obsolete, making identification of equivalent and substitute parts essential for ongoing design support and production continuity. The 74VHC138 base product series maintains consistent functional specifications across multiple manufacturers and package variants, enabling direct substitution based on electrical and mechanical compatibility.

Substiute Parts

74VHC138MTC

onsemiIn Stock: 213874VHC138MTC Datasheet

Current PartRFQ

74VHC138FT

Toshiba Semiconductor and StorageIn Stock: 2939274VHC138FT Datasheet

DirectRFQ

SN74AHC138PWR

Texas InstrumentsIn Stock: 10362SN74AHC138PWR Datasheet

DirectRFQ

74AHC138PW,118

Nexperia USA Inc.In Stock: 123674AHC138PW,118 Datasheet

UpgradeRFQ

74AHC138PW-Q100J

Nexperia USA Inc.In Stock: 349974AHC138PW-Q100J Datasheet

UpgradeRFQ

SN74AHC138DBR

Texas InstrumentsIn Stock: 2875SN74AHC138DBR Datasheet

SimilarRFQ

SN74AHC138DGVR

Texas InstrumentsIn Stock: 2889SN74AHC138DGVR Datasheet

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SN74AHC138PW

Texas InstrumentsIn Stock: 2343SN74AHC138PW Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 74VHC138MTC is determined by the following critical parameters:

Electrical Compatibility Requirements:

• Circuit configuration: 1 x 3:8 decoder/demultiplexer function
• Output current capability: 8mA high and low
• Supply voltage range: 2V ~ 5.5V minimum overlap
• Operating temperature range: Minimum -40°C to 85°C

Mechanical Compatibility Requirements:

• Package type: 16-TSSOP (0.173", 4.40mm Width) for direct PCB footprint compatibility
• Mounting type: Surface mount
• Pin count and arrangement: 16 pins

Compliance Requirements:

• RoHS3 compliance
• MSL rating: 1 (Unlimited)

Substitute parts are categorized as direct equivalents (identical package and specifications), upgrades (extended temperature range or automotive qualification), or similar variants (alternative package types with identical electrical function).

Parameter Comparison

Engineering Selection Recommendations

Direct Equivalents (16-TSSOP Package):

The 74VHC138FT (Toshiba), SN74AHC138PWR (Texas Instruments), and SN74AHC138PW (Texas Instruments) provide direct electrical and mechanical equivalence to the 74VHC138MTC. All three maintain identical circuit configuration, output current specifications, supply voltage range, and operating temperature limits within the -40°C to 85°C window. These parts are suitable for one-to-one PCB footprint replacement without design modification.

Upgraded Alternatives (Extended Temperature Range):

The 74AHC138PW,118 and 74AHC138PW-Q100J (both Nexperia USA Inc.) offer extended operating temperature capability to -40°C to 125°C while maintaining all other electrical specifications. The 74AHC138PW-Q100J includes AEC-Q100 automotive qualification and is suitable for applications requiring enhanced thermal performance or automotive-grade reliability. These parts are electrically compatible but require verification of PCB thermal design if the extended temperature range is not required.

Alternative Package Options:

The SN74AHC138DBR (16-SSOP, 0.209" width) and SN74AHC138DGVR (16-TVSOP) provide functional equivalence with different package geometries. These alternatives are suitable only when PCB layout accommodates the different package dimensions. The 16-SSOP variant is wider than the 16-TSSOP, while the 16-TVSOP represents a different thermal profile. Selection of these variants requires PCB redesign or confirmation of footprint compatibility.

Product Status Consideration:

All recommended substitutes maintain active product status with established supply chains, except SN74AHC138PW which is discontinued at DiGi Electronics. For new designs or long-term production, prioritize active status parts: 74VHC138FT, SN74AHC138PWR, 74AHC138PW,118, 74AHC138PW-Q100J, SN74AHC138DBR, or SN74AHC138DGVR.

Frequently Asked Questions (FAQ)

Q: Can the 74VHC138FT directly replace the 74VHC138MTC on the PCB?

A: Yes. The 74VHC138FT is a direct equivalent with identical 16-TSSOP package dimensions, pin configuration, and electrical specifications. No PCB modification is required.

Q: What is the difference between the 74AHC138PW,118 and 74AHC138PW-Q100J?

A: Both parts are manufactured by Nexperia and share identical electrical specifications and 16-TSSOP packaging. The 74AHC138PW-Q100J includes AEC-Q100 automotive qualification, making it suitable for automotive applications. The 74AHC138PW,118 is the standard industrial grade equivalent.

Q: Why are SN74AHC138DBR and SN74AHC138DGVR listed as similar rather than direct substitutes?

A: These parts use different package types (16-SSOP and 16-TVSOP respectively) compared to the original 16-TSSOP. While electrically equivalent, they have different physical dimensions and pin spacing, requiring PCB layout verification or redesign before implementation.

Q: Is the extended temperature range of the 74AHC138PW,118 (-40°C to 125°C) beneficial for standard applications?

A: Extended temperature range provides additional design margin and reliability headroom for applications operating near thermal limits. For standard applications within -40°C to 85°C, the standard temperature range parts (74VHC138FT, SN74AHC138PWR) are functionally adequate and may offer cost advantages.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts maintain RoHS3 compliance and MSL rating of 1 (Unlimited), matching the original 74VHC138MTC specifications.

Q: Which substitute part offers the best long-term availability?

A: The 74VHC138FT (Toshiba), SN74AHC138PWR (Texas Instruments), and Nexperia parts (74AHC138PW,118, 74AHC138PW-Q100J) all maintain active product status with established supply channels. Verify current inventory and lead times with your component distributor for production planning.