SN74LS259BNSRG4 Equivalent & Substitute Parts

Part Overview

The SN74LS259BNSRG4 is a D-Type addressable latch IC with 1:8 circuit configuration and standard output type, manufactured by Texas Instruments in the 74LS logic series. This component is classified as obsolete, making substitute parts necessary for ongoing production and maintenance applications. The part operates within a 4.75V to 5.25V supply voltage range and is designed for surface mount applications in 16-SOIC packaging.

Substiute Parts

SN74LS259BNSRG4

Texas InstrumentsIn Stock: 772SN74LS259BNSRG4 Datasheet

Current PartRFQ

SN74LS259BD

Texas InstrumentsIn Stock: 1548SN74LS259BD Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the SN74LS259BNSRG4 is determined by strict equivalence across the following critical parameters:

• Logic Type: D-Type, Addressable
• Circuit Configuration: 1:8
• Output Type: Standard
• Voltage - Supply: 4.75V ~ 5.25V
• Independent Circuits: 1
• Delay Time - Propagation: 19ns
• Current - Output High, Low: 400µA, 8mA
• Operating Temperature: 0°C ~ 70°C
• Base Product Number: 74LS259
• RoHS Status: ROHS3 Compliant
• Moisture Sensitivity Level (MSL): 1 (Unlimited)

The identified substitute part maintains functional and electrical equivalence while differing in packaging width specification and product status classification.

Parameter Comparison

Engineering Selection Recommendations

The SN74LS259BD serves as the direct substitute for the SN74LS259BNSRG4. Both parts are ROHS3 compliant and maintain identical electrical specifications across all critical parameters including supply voltage, propagation delay, output current ratings, and operating temperature range.

The primary distinction is product status: the main part is classified as obsolete, while the substitute is designated as Last Time Buy. This status difference reflects component lifecycle positioning rather than functional capability. The SN74LS259BD is the recommended selection for new designs and ongoing production requirements due to its extended availability window.

Package width variation (0.209" versus 0.154") represents a physical dimension difference within the 16-SOIC form factor. PCB layout compatibility must be verified for existing designs before implementation.

Frequently Asked Questions (FAQ)

Q: Can SN74LS259BD directly replace SN74LS259BNSRG4 in existing designs?

A: Yes, the SN74LS259BD is electrically equivalent across all specified parameters. Verification of PCB footprint compatibility is required due to package width differences (0.209" versus 0.154" in the 16-SOIC form factor).

Q: What is the significance of the product status difference between obsolete and Last Time Buy?

A: Obsolete status indicates the part is no longer manufactured or supported. Last Time Buy status indicates limited availability with a defined end-of-life window. The SN74LS259BD provides extended procurement opportunity compared to the obsolete main part.

Q: Are both parts RoHS compliant?

A: Yes, both SN74LS259BNSRG4 and SN74LS259BD are ROHS3 compliant with MSL rating of 1 (Unlimited).

Q: Do the parts have identical electrical performance?

A: Yes. Both parts share identical specifications for supply voltage (4.75V ~ 5.25V), propagation delay (19ns), output current ratings (400µA, 8mA), and operating temperature range (0°C ~ 70°C).

Q: What packaging consideration applies to this substitution?

A: Both parts use 16-SOIC surface mount packaging. The width specification differs (0.209" versus 0.154"), requiring PCB layout verification to ensure footprint compatibility with existing designs.