DM74LS08N Equivalent & Substitute Parts

Part Overview

The DM74LS08N is a 4-channel AND gate logic IC manufactured by onsemi in 14-MDIP packaging. This component implements four independent 2-input AND gates in a single 14-pin dual inline package. The DM74LS08N is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The SN74LS08N from Texas Instruments provides functional and electrical equivalence for applications requiring AND gate logic in this form factor.

Substiute Parts

DM74LS08N

onsemiIn Stock: 2000DM74LS08N Datasheet

Current PartRFQ

SN74LS08N

Texas InstrumentsIn Stock: 14416SN74LS08N Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the DM74LS08N with the SN74LS08N is valid based on the following criteria:

Matching Parameters:

• Logic Type: Both are AND gates
• Number of Circuits: Both contain 4 independent gates
• Number of Inputs: Both gates have 2 inputs
• Voltage Supply Range: Both operate at 4.75V ~ 5.25V
• Output Current Specifications: Both provide 400µA (high) and 8mA (low)
• Input Logic Levels: Both recognize 0.8V (low) and 2V (high)
• Operating Temperature Range: Both rated 0°C ~ 70°C
• Mounting Type: Both are through-hole components
• Package Footprint: Both use 14-DIP (0.300", 7.62mm) physical form factor
• Series Classification: Both belong to the 74LS logic family

The SN74LS08N maintains electrical and functional equivalence across all critical parameters that determine AND gate operation and circuit compatibility.

Parameter Comparison

Engineering Selection Recommendations

The SN74LS08N from Texas Instruments is the appropriate substitute for the obsolete DM74LS08N. Selection is based on:

Product Status: The DM74LS08N is classified as obsolete, while the SN74LS08N maintains active production status, ensuring long-term availability and supply chain continuity.

Compliance Certification: The SN74LS08N is ROHS3 compliant, meeting current environmental and regulatory requirements for new designs and manufacturing. The DM74LS08N is RoHS non-compliant.

Electrical Equivalence: All critical electrical parameters—supply voltage, output current, input logic levels, and operating temperature range—are identical between both parts, ensuring direct functional replacement in existing circuit designs.

Physical Compatibility: Both components use identical 14-DIP (0.300", 7.62mm) packaging, allowing direct pin-for-pin substitution without PCB redesign.

Frequently Asked Questions (FAQ)

Q: Can the SN74LS08N directly replace the DM74LS08N in existing designs?

A: Yes. The SN74LS08N provides pin-for-pin and functional equivalence. Both components implement four 2-input AND gates with identical electrical specifications, supply voltage requirements, and output current ratings. The 14-DIP package footprint is identical, requiring no PCB modifications.

Q: What is the difference in propagation delay between these parts?

A: The DM74LS08N specifies 18ns maximum propagation delay at 5V with 50pF load, while the SN74LS08N specifies 20ns at 5V with 15pF load. Both values fall within acceptable timing margins for standard 74LS logic applications. Timing-critical designs should verify propagation delay specifications against circuit requirements.

Q: Why is the DM74LS08N obsolete?

A: The DM74LS08N is classified as obsolete by the manufacturer. The SN74LS08N from Texas Instruments remains in active production and is the recommended substitute for new designs and production continuity.

Q: Are there packaging differences between these parts?

A: Both parts use 14-DIP (0.300", 7.62mm) through-hole packaging. The DM74LS08N is supplied in standard packaging, while the SN74LS08N is supplied in tube packaging. Both are compatible with standard DIP sockets and through-hole PCB assembly processes.

Q: Does the RoHS compliance difference affect substitution?

A: The SN74LS08N is ROHS3 compliant, while the DM74LS08N is RoHS non-compliant. For applications subject to RoHS regulations or environmental compliance requirements, the SN74LS08N is the required choice. For legacy systems without compliance requirements, both parts are functionally equivalent.

Q: What are the input logic level thresholds for these AND gates?

A: Both the DM74LS08N and SN74LS08N recognize input logic levels of 0.8V maximum for low state and 2V minimum for high state. These thresholds are standard for 74LS logic family components and ensure compatibility with other TTL-level logic circuits.