SN74HC138D Equivalent & Substitute Parts

Part Overview

The SN74HC138D is a 1 x 3:8 Decoder/Demultiplexer logic IC manufactured by Texas Instruments in 16-SOIC surface mount packaging. This part is discontinued at DiGi Electronics, making equivalent substitutes necessary for ongoing production and maintenance applications. The 74HC138 series decoder functions as a 3-to-8 line decoder with demultiplexing capability, suitable for address decoding and signal routing in digital logic circuits.

Substiute Parts

SN74HC138D

Texas InstrumentsIn Stock: 1942SN74HC138D Datasheet

Current PartRFQ

SN74HC138DR

Texas InstrumentsIn Stock: 30320SN74HC138DR Datasheet

DirectRFQ

MC74HC138ADR2G

onsemiIn Stock: 18583MC74HC138ADR2G Datasheet

DirectRFQ

74HC138D,653

Nexperia USA Inc.In Stock: 8809774HC138D,653 Datasheet

MFR RecommendedRFQ

74HC138D-Q100,118

Nexperia USA Inc.In Stock: 841874HC138D-Q100,118 Datasheet

MFR RecommendedRFQ

74HC138S16-13

Diodes IncorporatedIn Stock: 353574HC138S16-13 Datasheet

MFR RecommendedRFQ

MC74HC138ADG

onsemiIn Stock: 3615MC74HC138ADG Datasheet

MFR RecommendedRFQ

MM74HC138MX

Fairchild SemiconductorIn Stock: 29362MM74HC138MX Datasheet

MFR RecommendedRFQ

NLV74HC138ADR2G

onsemiIn Stock: 969NLV74HC138ADR2G Datasheet

MFR RecommendedRFQ

MM74HC138M

onsemiIn Stock: 1220MM74HC138M Datasheet

Parametric EquivalentRFQ

SN74HC138DG4

Texas InstrumentsIn Stock: 961SN74HC138DG4 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN74HC138D is determined by strict equivalence in the following parameters:

• Circuit configuration: 1 x 3:8 decoder/demultiplexer topology
• Output current specifications: 5.2mA high and low
• Supply voltage range: 2V to 6V minimum compatibility
• Package type: 16-SOIC form factor
• Mounting type: Surface mount
• RoHS and MSL compliance status

Substitute parts are grouped by product status (Active vs. Discontinued/Obsolete) and operating temperature range. Parts with extended temperature ranges (-55°C to 125°C) are suitable for applications requiring wider thermal operation. Packaging variants (Cut Tape, Tube, Tape & Reel) do not affect electrical equivalence but impact procurement and assembly workflows.

Parameter Comparison

Engineering Selection Recommendations

For direct replacement of the discontinued SN74HC138D, prioritize active product status parts with identical or extended operating temperature ranges and ROHS3 compliance.

SN74HC138DR (Texas Instruments, Active) provides the closest match with identical temperature specifications and active product status from the original manufacturer.

MC74HC138ADR2G and MC74HC138ADG (onsemi, Active) offer extended temperature operation (-55°C to 125°C) suitable for industrial and automotive applications requiring wider thermal margins.

74HC138D,653 and 74HC138D-Q100,118 (Nexperia USA Inc., Active) provide extended temperature ranges with AEC-Q100 automotive qualification available for the latter, supporting automotive-grade applications.

74HC138S16-13 (Diodes Incorporated, Active) offers extended temperature operation with Tape & Reel packaging suitable for high-volume production environments.

MM74HC138MX (Fairchild Semiconductor, Active) and MM74HC138M (onsemi, Active) maintain standard temperature specifications with tube packaging for lower-volume applications.

Avoid NLV74HC138ADR2G (onsemi, Obsolete) for new designs despite extended temperature capability.

Frequently Asked Questions (FAQ)

Q: Can I use any of these substitute parts as a direct replacement for SN74HC138D?

A: Yes, all listed active parts are electrically equivalent within the 16-SOIC package. Substitution is valid when the application operating temperature range does not exceed the substitute part's rated limits. Packaging format (Tube, Cut Tape, Tape & Reel) does not affect electrical performance but impacts procurement and assembly processes.

Q: What is the difference between standard temperature (-40°C to 85°C) and extended temperature (-55°C to 125°C) versions?

A: Extended temperature parts (MC74HC138ADR2G, MC74HC138ADG, 74HC138D,653, 74HC138D-Q100,118, 74HC138S16-13, NLV74HC138ADR2G) operate across wider thermal ranges suitable for industrial, automotive, and harsh environment applications. Standard temperature parts are adequate for commercial and consumer applications within -40°C to 85°C limits.

Q: Are all substitute parts RoHS3 compliant?

A: All listed active substitute parts are ROHS3 compliant except MM74HC138MX (Fairchild Semiconductor), which does not specify RoHS status. Verify RoHS compliance requirements for your application before selection.

Q: What does MSL 1 (Unlimited) mean?

A: MSL 1 indicates Moisture Sensitivity Level 1 with unlimited shelf life. These parts do not require special moisture control during storage or handling, simplifying logistics and inventory management.

Q: Which substitute offers the best availability?

A: 74HC138D,653 (Nexperia USA Inc.) shows the highest inventory at 88,009 pieces. SN74HC138DR (Texas Instruments) provides 30,300 pieces. Both are suitable for high-volume procurement.

Q: Can I use NLV74HC138ADR2G as a substitute?

A: NLV74HC138ADR2G is marked as Obsolete and should not be selected for new designs. Use active alternatives instead.

Q: Does the automotive-qualified version (74HC138D-Q100,118) work for non-automotive applications?

A: Yes, automotive-qualified parts (AEC-Q100) meet or exceed commercial specifications and function in non-automotive applications. The AEC-Q100 qualification indicates additional reliability testing and is not a limitation for general use.