74VHCT138ASJ Equivalent & Substitute Parts

Part Overview

The 74VHCT138ASJ is a decoder/demultiplexer logic IC manufactured by onsemi, featuring a 1 x 3:8 circuit configuration in a 16-SOP surface mount package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Substiute Parts

74VHCT138ASJ

onsemiIn Stock: 246074VHCT138ASJ Datasheet

Current PartRFQ

SN74AHCT138NSR

Texas InstrumentsIn Stock: 1329SN74AHCT138NSR Datasheet

DirectRFQ

SN74LV138ATNSR

Texas InstrumentsIn Stock: 1197SN74LV138ATNSR Datasheet

DirectRFQ

74AHCT138D,118

Nexperia USA Inc.In Stock: 122574AHCT138D,118 Datasheet

SimilarRFQ

SN74AHCT138D

Texas InstrumentsIn Stock: 2737SN74AHCT138D Datasheet

SimilarRFQ

SN74AHCT138DR

Texas InstrumentsIn Stock: 2012SN74AHCT138DR Datasheet

SimilarRFQ

SN74AHCT138MDREP

Texas InstrumentsIn Stock: 945SN74AHCT138MDREP Datasheet

SimilarRFQ

SN74AHCT138QDRQ1

Texas InstrumentsIn Stock: 1104SN74AHCT138QDRQ1 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 74VHCT138ASJ is determined by the following critical parameters:

• Circuit Configuration: 1 x 3:8 decoder/demultiplexer function
• Output Current Capability: 8mA minimum for both high and low states
• Voltage Supply Range: 4.5V ~ 5.5V compatibility
• Package Type: 16-SOIC surface mount configuration
• Mounting Compatibility: Surface mount technology

Substitute parts are grouped into two categories based on electrical compatibility:

Direct Substitutes maintain identical electrical specifications and package dimensions, enabling pin-for-pin replacement.

Similar Substitutes maintain core functionality and voltage/current specifications but may have extended operating temperature ranges or different package width specifications (0.154" vs 0.209"), requiring PCB layout verification.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: SN74AHCT138NSR

The SN74AHCT138NSR from Texas Instruments is the optimal direct substitute. It maintains identical electrical specifications (8mA output current, 4.5V ~ 5.5V supply, -40°C ~ 85°C operating range) and package dimensions (5.30mm width). Product status is active with ROHS3 compliance, ensuring long-term availability and regulatory alignment.

Secondary Recommendation: SN74AHCT138DR

The SN74AHCT138DR provides equivalent electrical performance with active product status and ROHS3 compliance. Package width is 3.90mm, requiring PCB layout verification for footprint compatibility. Operating temperature range matches the original specification.

Extended Temperature Option: SN74AHCT138MDREP

For applications requiring extended temperature operation (-55°C ~ 125°C), the SN74AHCT138MDREP maintains identical electrical specifications with active status and ROHS3 compliance. Package width is 3.90mm.

Automotive Grade Option: SN74AHCT138QDRQ1

For automotive applications requiring AEC-Q100 qualification, the SN74AHCT138QDRQ1 provides identical electrical specifications with extended operating temperature (-40°C ~ 125°C). Active product status and ROHS3 compliance are confirmed.

Alternative Manufacturer: 74AHCT138D,118

The 74AHCT138D,118 from Nexperia USA Inc. offers active product status with extended operating temperature (-40°C ~ 125°C) and ROHS3 compliance. Package width is 3.90mm, requiring PCB layout verification.

Frequently Asked Questions (FAQ)

Q: Can SN74AHCT138NSR replace 74VHCT138ASJ directly?

A: Yes. The SN74AHCT138NSR maintains identical output current (8mA), voltage supply range (4.5V ~ 5.5V), operating temperature (-40°C ~ 85°C), and package dimensions (16-SOIC, 5.30mm width). Pin-for-pin replacement is supported.

Q: What is the difference between 5.30mm and 3.90mm package widths?

A: Package width refers to the physical dimension of the 16-SOIC component body. The 5.30mm width (0.209") matches the original 74VHCT138ASJ specification. The 3.90mm width (0.154") is a narrower variant. PCB footprint compatibility must be verified before substitution.

Q: Why is SN74LV138ATNSR listed as a similar substitute despite higher output current?

A: The SN74LV138ATNSR maintains the 1 x 3:8 decoder/demultiplexer function and 4.5V ~ 5.5V supply range. The 12mA output current (versus 8mA) is a higher capability that does not prevent substitution in most applications. However, product status is discontinued at DiGi Electronics, limiting procurement viability.

Q: Are all substitute parts ROHS3 compliant?

A: All listed substitute parts carry ROHS3 compliance status. The original 74VHCT138ASJ is REACH unaffected. Regulatory alignment should be confirmed for specific application requirements.

Q: What is the significance of AEC-Q100 qualification on SN74AHCT138QDRQ1?

A: AEC-Q100 qualification indicates automotive-grade reliability testing and is required for automotive applications. The SN74AHCT138QDRQ1 is the only substitute with this certification.

Q: Can I use a substitute with extended operating temperature in a standard application?

A: Yes. Extended operating temperature ranges (-55°C ~ 125°C or -40°C ~ 125°C) are backward compatible with the original specification (-40°C ~ 85°C). The component will function correctly across the narrower original temperature range.

Q: What packaging options are available for substitutes?

A: Substitute parts are available in Tape & Reel (TR), Cut Tape (CT) & Digi-Reel, and Tube packaging. Selection depends on procurement volume and assembly process requirements. All maintain 16-SOIC surface mount configuration.