DM74LS273N Equivalent & Substitute Parts

Part Overview

The DM74LS273N is a D-Type flip-flop logic integrated circuit with 8-bit capacity, single element configuration, and positive edge triggering. Manufactured by onsemi in a 20-DIP through-hole package, this component is classified as obsolete product status. Due to its obsolescence, identifying functionally equivalent and mechanically compatible substitute parts is essential for system redesign, board revision, and long-term supply chain continuity.

Substiute Parts

DM74LS273N

onsemiIn Stock: 1997DM74LS273N Datasheet

Current PartRFQ

SN74ABT273N

Texas InstrumentsIn Stock: 1600SN74ABT273N Datasheet

SimilarRFQ

SN74LS273N

Texas InstrumentsIn Stock: 13841SN74LS273N Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the DM74LS273N are qualified based on the following criteria:

Functional Equivalence:

• Type: D-Type flip-flop
• Number of Elements: 1
• Number of Bits per Element: 8
• Function: Master Reset
• Output Type: Non-Inverted
• Trigger Type: Positive Edge

Mechanical Compatibility:

• Package / Case: 20-DIP (0.300", 7.62mm)
• Mounting Type: Through Hole
• Supplier Device Package: 20-PDIP

Electrical Compatibility:

• Voltage - Supply range must encompass or overlap with 4.75V ~ 5.25V
• Operating Temperature range must support 0°C ~ 70°C minimum

The following parts meet these substitution criteria:

1. SN74LS273N (Texas Instruments) – Direct series equivalent with identical electrical specifications
2. SN74ABT273N (Texas Instruments) – Advanced BiCMOS technology variant with enhanced performance characteristics

Parameter Comparison

Engineering Selection Recommendations

SN74LS273N (Texas Instruments) is the primary substitute for DM74LS273N. This part maintains identical electrical specifications, supply voltage range, and operating temperature range. The SN74LS273N is active product status with ROHS3 compliance, providing long-term availability and regulatory alignment for new designs and board revisions.

SN74ABT273N (Texas Instruments) is a secondary substitute offering enhanced performance characteristics. The 74ABT series provides 150 MHz clock frequency capability versus 30 MHz for the original part, extended operating temperature range (-40°C to 85°C), and higher output current drive (32mA/64mA versus 400µA/8mA). The SN74ABT273N maintains identical functional architecture, 20-DIP package compatibility, and ROHS3 compliance. This variant is suitable for applications requiring improved speed performance or extended temperature operation within the same mechanical footprint.

Both substitute parts are active products with established supply chains and regulatory compliance certifications, eliminating obsolescence risk associated with the DM74LS273N.

Frequently Asked Questions (FAQ)

Q: Can SN74LS273N directly replace DM74LS273N without circuit modification?

A: Yes. The SN74LS273N maintains identical electrical specifications, pin configuration, and functional behavior. No circuit modifications are required for direct substitution in existing designs.

Q: What are the key differences between SN74LS273N and SN74ABT273N?

A: Both parts are functionally equivalent D-Type 8-bit flip-flops in 20-DIP packages. The SN74ABT273N operates at higher clock frequencies (150 MHz versus 40 MHz), provides greater output current drive capability, and supports extended temperature operation (-40°C to 85°C versus 0°C to 70°C). Supply voltage range for SN74ABT273N is 4.5V to 5.5V, providing slightly wider tolerance than the 74LS variant.

Q: Are both substitute parts RoHS compliant?

A: Yes. Both SN74LS273N and SN74ABT273N are ROHS3 compliant, meeting current regulatory requirements for electronic components in most jurisdictions.

Q: What is the physical package compatibility between DM74LS273N and substitute parts?

A: All three parts use identical 20-DIP (0.300", 7.62mm) through-hole packages. Pin-to-pin compatibility is maintained, allowing direct socket substitution on existing printed circuit boards.

Q: Which substitute part should be selected for new designs?

A: For new designs, SN74LS273N is recommended for applications matching the original 30 MHz performance envelope. SN74ABT273N is recommended for designs requiring higher clock frequencies, extended temperature operation, or improved output drive capability, all within the same package footprint.

Q: Is the DM74LS273N still available for purchase?

A: The DM74LS273N is classified as obsolete. Active product alternatives (SN74LS273N and SN74ABT273N) are recommended for new procurement and design activities.