SN74ALS273DW Equivalent & Substitute Parts

Part Overview

The SN74ALS273DW is a D-Type flip-flop logic integrated circuit manufactured by Texas Instruments, featuring 1 element with 8-bit capacity and positive edge triggering. This component operates at a maximum clock frequency of 35 MHz with a propagation delay of 15ns at 5V with 50pF load. The device is packaged in a 20-SOIC surface mount configuration and is currently classified as Last Time Buy, indicating end-of-life status. Identifying equivalent substitute parts is essential for maintaining design continuity and ensuring long-term component availability for production and maintenance applications.

Substiute Parts

SN74ALS273DW

Texas InstrumentsIn Stock: 2116SN74ALS273DW Datasheet

Current PartRFQ

SN74ALS273DWR

Texas InstrumentsIn Stock: 3066SN74ALS273DWR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SN74ALS273DW is determined by strict equivalence across the following critical parameters:

• Functional Architecture: D-Type flip-flop with 1 element and 8-bit configuration
• Electrical Performance: Clock frequency of 35 MHz, propagation delay of 15ns at 5V with 50pF load, positive edge triggering
• Output Characteristics: Non-inverted output type with specified current ratings (2.6mA high, 24mA low)
• Power Supply: 4.5V to 5.5V operating range with 20 mA quiescent current
• Package Specification: 20-SOIC surface mount package with 0.295" (7.50mm) width
• Compliance Standards: ROHS3 compliance and MSL Level 1 rating

The SN74ALS273DWR qualifies as a direct substitute based on identical electrical specifications, functional characteristics, and package configuration. The primary distinction is packaging format and product status.

Parameter Comparison

Engineering Selection Recommendations

The SN74ALS273DWR is the direct equivalent substitute for the SN74ALS273DW. Both components are manufactured by Texas Instruments and share identical electrical specifications, functional characteristics, and package dimensions. The SN74ALS273DWR maintains Active product status, ensuring continued availability and support, whereas the SN74ALS273DW is designated Last Time Buy. Both components meet ROHS3 compliance requirements and carry MSL Level 1 rating, confirming equivalent environmental and regulatory standing. Selection between these parts should be based on packaging requirements and supply chain considerations, as the SN74ALS273DWR is available in Cut Tape and Digi-Reel formats while the SN74ALS273DW is supplied in Tube packaging.

Frequently Asked Questions (FAQ)

Q: Can the SN74ALS273DWR be used as a direct replacement for the SN74ALS273DW?

A: Yes. Both components are electrically and functionally identical with matching specifications across all critical parameters including clock frequency, propagation delay, output characteristics, power supply range, and package configuration. The primary difference is product status and packaging format.

Q: What is the significance of the Last Time Buy status on the SN74ALS273DW?

A: Last Time Buy designation indicates the component is at end-of-life. Texas Instruments will discontinue production after existing inventory is depleted. The SN74ALS273DWR, with Active status, represents the recommended path for new designs and ongoing production requirements.

Q: Are there packaging compatibility considerations between Tube and Cut Tape formats?

A: Both packaging formats contain identical die and electrical specifications. The difference is in handling and storage format. Tube packaging is suitable for manual assembly and smaller quantities, while Cut Tape and Digi-Reel formats are optimized for automated pick-and-place assembly equipment. PCB design and electrical performance are unaffected by packaging format selection.

Q: Do both parts meet the same compliance and environmental standards?

A: Yes. Both the SN74ALS273DW and SN74ALS273DWR are ROHS3 compliant, REACH unaffected, and carry MSL Level 1 rating. They meet identical regulatory and environmental requirements.

Q: What are the key electrical parameters that define substitution eligibility?

A: Substitution is based on matching D-Type flip-flop architecture with 1 element and 8-bit configuration, 35 MHz clock frequency, 15ns propagation delay at 5V with 50pF load, positive edge triggering, non-inverted output type, 4.5V to 5.5V supply range, and 20-SOIC surface mount package specification.