74HCT138N,652 Equivalent & Substitute Parts

Part Overview

The 74HCT138N,652 is a Decoder/Demultiplexer logic integrated circuit manufactured by NXP USA Inc. in a 16-DIP through-hole package. This component performs 1 x 3:8 decoding/demultiplexing functions and operates from a single 4.5V to 5.5V supply. The part is currently listed as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and production continuity.

Substiute Parts

74HCT138N,652

NXP USA Inc.In Stock: 77174HCT138N,652 Datasheet

Current PartRFQ

CD74HCT138E

Texas InstrumentsIn Stock: 1117CD74HCT138E Datasheet

UpgradeRFQ

74HCT138D,653

Nexperia USA Inc.In Stock: 1040774HCT138D,653 Datasheet

MFR RecommendedRFQ

SN74HCT138N

Texas InstrumentsIn Stock: 2894SN74HCT138N Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 74HCT138N,652 is determined by the following criteria:

Electrical Compatibility Requirements:

• Identical base product number (74HCT138)
• Matching circuit configuration (1 x 3:8)
• Identical output current specifications (4mA, 4mA)
• Identical supply voltage range (4.5V ~ 5.5V)
• Compatible operating temperature range (minimum -40°C, maximum 125°C or higher)

Mechanical Compatibility Requirements:

• Package type must be 16-DIP or equivalent 16-pin DIP variant
• Through-hole mounting type for direct PCB compatibility

Compliance Requirements:

• ROHS3 compliance maintained
• REACH unaffected status maintained

Three substitute parts meet these criteria with variations in product status, manufacturer, and packaging format.

Parameter Comparison

Engineering Selection Recommendations

CD74HCT138E (Texas Instruments): This part is electrically and mechanically identical to the main part with active product status. It offers an extended operating temperature range (-55°C to 125°C) compared to the original specification. Direct through-hole DIP package compatibility enables pin-for-pin substitution without PCB modification.

74HCT138D,653 (Nexperia USA Inc.): This part maintains identical electrical specifications and active product status. The primary difference is surface-mount SOIC packaging, which requires PCB redesign and is not suitable for direct replacement in through-hole applications. This option is applicable only for new designs or PCB revisions.

SN74HCT138N (Texas Instruments): This part provides through-hole DIP package compatibility with active product status. The operating temperature range is limited to -40°C to 85°C, which is narrower than the original specification. Selection of this part is appropriate only when the application temperature range does not exceed 85°C.

Frequently Asked Questions (FAQ)

Q: Can CD74HCT138E be used as a direct replacement for 74HCT138N,652?

A: Yes. CD74HCT138E is electrically and mechanically compatible. Both parts use 16-DIP through-hole packaging with identical pin configurations, supply voltage requirements (4.5V ~ 5.5V), and output current specifications (4mA, 4mA). The extended temperature range of CD74HCT138E (-55°C to 125°C) provides additional margin beyond the original -40°C to 125°C specification.

Q: Why is 74HCT138D,653 listed as a substitute if it uses a different package?

A: 74HCT138D,653 meets all electrical substitution criteria and maintains active product status. However, its 16-SOIC surface-mount package is mechanically incompatible with the through-hole DIP footprint of the original part. This substitute is applicable only for new PCB designs or existing designs undergoing revision to surface-mount technology.

Q: What is the temperature limitation of SN74HCT138N?

A: SN74HCT138N operates from -40°C to 85°C, which is narrower than the original part's -40°C to 125°C range. This part is suitable only for applications where the maximum operating temperature does not exceed 85°C.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and REACH unaffected status, consistent with the original part's regulatory certifications.

Q: What is the primary reason for finding substitutes for 74HCT138N,652?

A: The original part is listed as obsolete. Active substitute parts ensure design continuity and production availability for applications requiring 74HCT138 decoder/demultiplexer functionality.