DM74S20N NAND Gate IC Equivalent & Substitute Parts

Part Overview

The DM74S20N is a NAND Gate IC featuring 2 channels with 4 inputs per channel in a 14-MDIP package, manufactured by onsemi. This logic component operates within the 74S series standard and is classified as obsolete. Due to its obsolete status and limited availability from the original manufacturer, identifying compatible substitute parts is essential for system maintenance, redesign, and procurement continuity.

Substiute Parts

DM74S20N

onsemiIn Stock: 1905DM74S20N Datasheet

Current PartRFQ

SN74S20N

Texas InstrumentsIn Stock: 16871SN74S20N Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the DM74S20N is determined by strict equivalence across the following critical parameters:

• Logic Function: Both parts must implement identical NAND gate logic with 2 channels and 4 inputs per channel
• Electrical Specifications: Supply voltage range (4.75V ~ 5.25V), output current ratings (1mA high, 20mA low), and input logic levels (0.8V low, 2V high) must match or exceed the original specification
• Package Compatibility: 14-DIP through-hole mounting with 0.300" (7.62mm) pitch ensures direct PCB compatibility
• Base Product Series: Both parts must belong to the 74S logic family, ensuring functional and timing equivalence
• Operating Temperature Range: 0°C ~ 70°C operational envelope must be maintained

The SN74S20N from Texas Instruments meets all substitution criteria as an active, functionally equivalent alternative.

Parameter Comparison

Engineering Selection Recommendations

The SN74S20N from Texas Instruments is a direct functional substitute for the DM74S20N. The substitute part maintains identical electrical specifications and package compatibility while offering superior propagation delay performance (5ns versus 8ns). The SN74S20N carries active product status with ROHS3 compliance, providing supply chain continuity and regulatory alignment for new designs and legacy system maintenance.

Frequently Asked Questions (FAQ)

Q: Can the SN74S20N replace the DM74S20N in existing designs? A: Yes. Both parts implement identical NAND gate logic with matching electrical specifications, supply voltage ranges, input/output current ratings, and 14-DIP package geometry. Direct pin-for-pin substitution is supported.

Q: What is the difference in propagation delay between these parts? A: The SN74S20N exhibits 5ns maximum propagation delay compared to 8ns for the DM74S20N, both measured at 5V with 50pF load. This represents improved timing performance in the substitute part.

Q: Are there package compatibility concerns? A: No. Both parts use identical 14-DIP (0.300", 7.62mm) through-hole packaging, ensuring direct PCB compatibility without layout modifications.

Q: Why is the DM74S20N listed as obsolete? A: Obsolete status indicates the part is no longer manufactured by onsemi. The SN74S20N from Texas Instruments provides continued availability for this logic function.

Q: Does the SN74S20N meet current regulatory requirements? A: Yes. The SN74S20N is ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory standards for component procurement.

Q: Are the operating temperature ranges identical? A: Yes. Both parts operate across the 0°C to 70°C temperature range, maintaining functional equivalence across the specified thermal envelope.