DM74LS156N Equivalent & Substitute Parts

Part Overview

The DM74LS156N is a Decoder/Demultiplexer logic integrated circuit manufactured by onsemi, featuring a 2 x 1:4 circuit configuration in a 16-PDIP package. This component is classified as obsolete, which necessitates identification of equivalent substitute parts for ongoing system maintenance and new design implementations. The part operates on single supply voltage and is suitable for through-hole mounting applications.

Substiute Parts

DM74LS156N

onsemiIn Stock: 2188DM74LS156N Datasheet

Current PartRFQ

SN74LS156N

Texas InstrumentsIn Stock: 3457SN74LS156N Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the DM74LS156N are identified based on the following critical parameters that must remain consistent:

• Circuit configuration: 2 x 1:4 Decoder/Demultiplexer topology
• Package type: 16-DIP (0.300", 7.62mm) through-hole mounting
• Voltage supply range: 4.75V ~ 5.25V single supply
• Operating temperature range: 0°C ~ 70°C
• Logic family: 74LS series

The SN74LS156N from Texas Instruments meets all these requirements and serves as a direct functional equivalent.

Parameter Comparison

Engineering Selection Recommendations

The SN74LS156N from Texas Instruments is the primary substitute for the obsolete DM74LS156N. Both parts share identical circuit topology, package configuration, and electrical operating parameters. The Texas Instruments variant maintains active product status, ensuring continued availability and supply chain reliability. Both components are REACH compliant and classified under the same export control number (EAR99).

The SN74LS156N is suitable for direct replacement in existing designs and new implementations requiring 2 x 1:4 decoder/demultiplexer functionality in 16-DIP through-hole packages.

Frequently Asked Questions (FAQ)

Q: Can the SN74LS156N directly replace the DM74LS156N in existing circuit boards?

A: Yes. Both parts share identical pin configurations, package dimensions (16-DIP, 0.300" spacing), and electrical specifications including voltage supply range (4.75V ~ 5.25V) and operating temperature range (0°C ~ 70°C). Direct substitution is possible without circuit modification.

Q: What is the primary difference between these two parts?

A: The DM74LS156N is obsolete, while the SN74LS156N maintains active product status. The SN74LS156N also specifies RoHS3 compliance. Both parts are functionally equivalent for decoder/demultiplexer applications.

Q: Are there any output current differences between these parts?

A: The DM74LS156N specifies output high current of 400µA, while the SN74LS156N specifies 100µA. Both maintain identical output low current of 8mA. This difference does not affect functional compatibility in standard logic applications.

Q: What packaging options are available for these parts?

A: Both the DM74LS156N and SN74LS156N are supplied in 16-DIP through-hole packages. The DM74LS156N is available in standard packaging, while the SN74LS156N is supplied in tube packaging.

Q: Are these parts compliant with environmental regulations?

A: Both parts are REACH compliant and unaffected by REACH restrictions. Both are classified under ECCN EAR99 for export control purposes.