SN74LS273DW Equivalent & Substitute Parts

Part Overview

The SN74LS273DW is a Logic category integrated circuit functioning as a Flip Flop with 1 Element D-Type configuration, 8-bit capacity, and positive edge triggering. This component is classified as discontinued at DiGi Electronics, which necessitates identification of active equivalent parts for ongoing design requirements and procurement needs. The part operates within the 74LS series standard logic family and is housed in a 20-SOIC surface mount package.

Substiute Parts

SN74LS273DW

Texas InstrumentsIn Stock: 2290SN74LS273DW Datasheet

Current PartRFQ

SN74LS273DWR

Texas InstrumentsIn Stock: 3092SN74LS273DWR Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN74LS273DW is determined by strict equivalence across the following critical parameters:

• Base Product Number: 74LS273
• Package Type: 20-SOIC surface mount configuration
• Functional Architecture: 1 Element D-Type Flip Flop, 8-bit
• Electrical Specifications: 40 MHz clock frequency, 27 ns propagation delay, 4.75V–5.25V supply voltage
• Output Characteristics: Non-inverted, positive edge trigger
• Environmental Compliance: ROHS3 compliant, MSL Level 1

The SN74LS273DWR qualifies as a direct substitute based on identical electrical performance, mechanical compatibility, and compliance certifications. The primary distinction is product status and packaging format.

Parameter Comparison

Engineering Selection Recommendations

The SN74LS273DWR is the direct active equivalent for the discontinued SN74LS273DW. Both parts maintain identical electrical specifications, timing characteristics, and mechanical compatibility within the 20-SOIC package footprint. The SN74LS273DWR carries active product status and is available in Cut Tape and Digi-Reel packaging formats, supporting both prototype and production volume requirements.

Both parts satisfy ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment for current design standards. The MSL Level 1 rating indicates unlimited shelf life under standard storage conditions.

Frequently Asked Questions (FAQ)

Q: Can the SN74LS273DWR be used as a direct replacement for the SN74LS273DW?

A: Yes. Both parts are electrically and mechanically identical. The SN74LS273DWR differs only in product status (active versus discontinued) and packaging format (Cut Tape/Digi-Reel versus standard).

Q: Are there any timing or performance differences between these parts?

A: No. Both parts specify identical clock frequency (40 MHz), propagation delay (27 ns @ 5V, 15pF), and output drive characteristics (400µA high, 8mA low).

Q: What is the significance of the packaging format difference?

A: The SN74LS273DW uses standard packaging, while the SN74LS273DWR is supplied in Cut Tape and Digi-Reel formats. This distinction affects procurement and handling but does not impact electrical or mechanical performance.

Q: Are both parts suitable for new designs?

A: The SN74LS273DWR is recommended for new designs due to its active product status. The SN74LS273DW is discontinued and should be replaced with the SN74LS273DWR for ongoing procurement.

Q: Do these parts require any PCB layout modifications?

A: No. Both parts use the identical 20-SOIC (0.295", 7.50mm Width) package, requiring no changes to PCB footprints or assembly procedures.

Q: What are the storage and handling requirements?

A: Both parts carry MSL Level 1 rating, indicating unlimited shelf life under standard storage conditions. Standard electrostatic discharge (ESD) precautions apply to all handling and assembly operations.