DM74LS138N Equivalent & Substitute Parts

Part Overview

The DM74LS138N is a 3-line to 8-line decoder/demultiplexer logic IC manufactured by onsemi in a 16-DIP package. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The decoder/demultiplexer function with 1 x 3:8 circuit configuration remains functionally consistent across qualified substitute parts, enabling direct replacement in applications requiring address decoding or signal demultiplexing.

Substiute Parts

DM74LS138N

onsemiIn Stock: 6504DM74LS138N Datasheet

Current PartRFQ

SN74LS138N

Texas InstrumentsIn Stock: 16267SN74LS138N Datasheet

DirectRFQ

SN74LS138NE4

Texas InstrumentsIn Stock: 803SN74LS138NE4 Datasheet

Parametric EquivalentRFQ

SN74S138AN

Texas InstrumentsIn Stock: 2048SN74S138AN Datasheet

Parametric EquivalentRFQ

SN74S138ANE4

Texas InstrumentsIn Stock: 964SN74S138ANE4 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the DM74LS138N are qualified based on matching the following critical parameters: identical decoder/demultiplexer circuit configuration (1 x 3:8), compatible 16-DIP package footprint, matching voltage supply range (4.75V ~ 5.25V), equivalent output current specifications (400µA high, 8mA low), and overlapping operating temperature range (0°C ~ 70°C). All substitute parts maintain through-hole mounting compatibility and preserve functional equivalence for address decoding and demultiplexing applications.

Parameter Comparison

Engineering Selection Recommendations

The DM74LS138N is obsolete; direct replacement with active-status equivalents is required for new production. SN74LS138N and SN74LS138NE4 from Texas Instruments provide direct series-level substitution with identical 74LS specifications and ROHS3 compliance. SN74S138AN and SN74S138ANE4 offer parametric equivalence with 74S series performance characteristics while maintaining all critical electrical and mechanical parameters. All substitute parts are actively manufactured and ROHS3 compliant, eliminating the compliance gap present in the obsolete onsemi part. Selection between 74LS and 74S variants depends on application-specific performance requirements; both series maintain functional compatibility within the specified parameter envelope.

Frequently Asked Questions (FAQ)

Q: Can SN74LS138N directly replace DM74LS138N in existing designs? A: Yes. Both parts share identical 74LS series specifications, circuit configuration (1 x 3:8), 16-DIP package footprint, voltage supply range (4.75V ~ 5.25V), output current ratings (400µA / 8mA), and operating temperature range (0°C ~ 70°C). The primary difference is product status: DM74LS138N is obsolete while SN74LS138N is active production.

Q: What is the difference between SN74LS138N and SN74LS138NE4? A: Both are Texas Instruments 74LS series parts with identical electrical specifications and 16-DIP packaging. The NE4 suffix indicates a specific packaging variant (tube packaging). Functional and parametric equivalence is complete; selection depends on packaging and inventory requirements.

Q: Are SN74S138AN and SN74S138ANE4 compatible with DM74LS138N applications? A: Yes. These parts maintain parametric equivalence across all critical specifications: circuit configuration (1 x 3:8), package (16-DIP), voltage supply (4.75V ~ 5.25V), output current (400µA / 8mA), and operating temperature (0°C ~ 70°C). The 74S series designation indicates faster switching characteristics within the same functional envelope.

Q: Does the 16-DIP package footprint remain consistent across all substitutes? A: Yes. All substitute parts use the 16-DIP (0.300", 7.62mm) package with through-hole mounting, ensuring PCB layout and mechanical compatibility without redesign.

Q: What compliance advantage do substitute parts offer? A: All Texas Instruments substitutes (SN74LS138N, SN74LS138NE4, SN74S138AN, SN74S138ANE4) are ROHS3 compliant, addressing the RoHS non-compliance status of the obsolete DM74LS138N. This compliance is mandatory for new designs in regulated markets.