DM74ALS138N Equivalent & Substitute Parts

Part Overview

The DM74ALS138N is a decoder/demultiplexer integrated circuit manufactured by onsemi, featuring a 1 x 3:8 configuration in a 16-DIP package. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing design requirements and production continuity. The part operates with single supply voltage and is suitable for applications requiring address decoding and demultiplexing functions in digital logic circuits.

Substiute Parts

DM74ALS138N

onsemiIn Stock: 1455DM74ALS138N Datasheet

Current PartRFQ

SN74ALS138AN

Texas InstrumentsIn Stock: 3299SN74ALS138AN Datasheet

DirectRFQ

SN74ALS137AN

Texas InstrumentsIn Stock: 2585SN74ALS137AN Datasheet

Parametric EquivalentRFQ

SN74AS138N

Texas InstrumentsIn Stock: 2235SN74AS138N Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the DM74ALS138N is determined by the following critical parameters:

• Decoder/Demultiplexer type with 1 x 3:8 circuit configuration
• Output current specifications: 400µA (high), 8mA (low)
• Single supply voltage operation within 4.5V ~ 5.5V range
• Operating temperature range: 0°C ~ 70°C
• Through-hole mounting in 16-DIP package format
• 16-PDIP supplier device package designation

The substitute parts identified maintain full compatibility across all electrical and mechanical parameters. Differences in product status, manufacturer, and compliance certifications do not affect functional interchangeability within the specified parameter constraints.

Parameter Comparison

Engineering Selection Recommendations

All three substitute parts maintain full electrical and mechanical compatibility with the DM74ALS138N across all specified parameters. Selection should prioritize active product status and compliance certifications:

SN74ALS138AN (Texas Instruments) is the direct functional equivalent, maintaining the 74ALS series designation and active product status with ROHS3 compliance.

SN74ALS137AN (Texas Instruments) provides parametric equivalence within the 74ALS series with active product status and ROHS3 compliance. The base product number differs (74ALS137 vs. 74ALS138), but electrical and mechanical parameters remain fully compatible.

SN74AS138N (Texas Instruments) operates within the faster 74AS logic series while maintaining all specified electrical parameters and mechanical compatibility. This part offers active product status and ROHS3 compliance.

All substitute parts are manufactured by Texas Instruments with active product status, ensuring long-term availability and supply chain continuity compared to the obsolete onsemi original.

Frequently Asked Questions (FAQ)

Q: Can SN74ALS138AN directly replace DM74ALS138N in existing designs?

A: Yes. Both parts maintain identical electrical specifications (400µA/8mA output current, 4.5V ~ 5.5V supply, 0°C ~ 70°C operating range) and mechanical compatibility (16-DIP through-hole package). The primary difference is manufacturer and product status (active vs. obsolete).

Q: What is the difference between SN74ALS138AN and SN74ALS137AN?

A: Both parts are functionally equivalent within the specified parameters. The base product numbers differ (74ALS138 vs. 74ALS137), but they share identical circuit configuration (1 x 3:8), output current ratings, supply voltage range, operating temperature, and package format. Selection between these parts depends on availability and supply chain requirements.

Q: Why is SN74AS138N listed as a substitute if it uses a different series (74AS vs. 74ALS)?

A: The 74AS series operates at faster switching speeds than 74ALS, but maintains all critical electrical parameters specified for the DM74ALS138N: identical output current (400µA/8mA), supply voltage (4.5V ~ 5.5V), operating temperature (0°C ~ 70°C), and package format (16-DIP). The faster logic family is backward compatible for applications requiring the specified performance envelope.

Q: Are there any compliance or regulatory differences between the original and substitutes?

A: All parts share identical REACH status (REACH Unaffected), ECCN (EAR99), and HTSUS classification (8542.39.0001). The substitute parts from Texas Instruments carry ROHS3 compliance certification, whereas the original onsemi part lists MSL 1 (Unlimited). These differences do not affect functional interchangeability.

Q: Can I use these parts interchangeably in PCB designs without layout modifications?

A: Yes. All parts use the 16-DIP (0.300", 7.62mm) through-hole package with 16-PDIP supplier designation. Pin configuration and mechanical dimensions are identical, allowing direct substitution without PCB redesign.