SN74LS641-1DW Equivalent & Substitute Parts

Part Overview

The SN74LS641-1DW is a non-inverting transceiver logic integrated circuit manufactured by Texas Instruments. This device functions as a 1-element, 8-bit transceiver with open collector output, designed for 5V logic applications. The SN74LS641-1DW is classified as Last Time Buy, indicating end-of-life status. Identifying equivalent substitute parts is necessary to ensure continued design support and procurement availability for new production runs and system maintenance.

Substiute Parts

SN74LS641-1DW

Texas InstrumentsIn Stock: 885SN74LS641-1DW Datasheet

Current PartRFQ

SN74LS641-1DWR

Texas InstrumentsIn Stock: 846SN74LS641-1DWR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN74LS641-1DW is determined by strict equivalence across the following critical parameters:

• Logic Type: Transceiver, Non-Inverting
• Number of Elements: 1
• Number of Bits per Element: 8
• Output Type: Open Collector
• Current - Output Low: 48 mA
• Voltage - Supply: 4.75V ~ 5.25V
• Operating Temperature: 0°C ~ 70°C (TA)
• Package / Case: 20-SOIC (0.295", 7.50mm Width)
• Mounting Type: Surface Mount

The substitute part must maintain identical electrical specifications and physical packaging to ensure direct replacement capability without circuit redesign or PCB modification.

Parameter Comparison

Engineering Selection Recommendations

The SN74LS641-1DW is designated Last Time Buy status, making the SN74LS641-1DWR the appropriate substitute for ongoing production and procurement. Both parts are manufactured by Texas Instruments and maintain identical electrical and mechanical specifications across all critical parameters. The SN74LS641-1DWR carries Active product status, ensuring long-term availability and supply chain continuity.

Both parts satisfy ROHS3 compliance and REACH unaffected requirements. The primary distinction between the two parts is packaging format: the main part is supplied in Tube packaging, while the substitute is supplied in Tape & Reel (TR) format. This packaging difference does not affect electrical performance or functional compatibility.

Frequently Asked Questions (FAQ)

Q: Can the SN74LS641-1DWR directly replace the SN74LS641-1DW in existing designs?

A: Yes. Both parts are electrically and mechanically identical. The SN74LS641-1DWR is a direct substitute with no circuit modifications required.

Q: What is the difference between Tube and Tape & Reel packaging?

A: Tube packaging is used for lower-volume orders and manual assembly processes. Tape & Reel (TR) packaging is designed for automated pick-and-place assembly equipment. Both formats contain the same component with identical specifications.

Q: Why is the SN74LS641-1DW marked as Last Time Buy?

A: Last Time Buy designation indicates the manufacturer is discontinuing this product. Customers requiring this component should transition to the SN74LS641-1DWR, which maintains identical functionality and is in Active production status.

Q: Are there any compliance or certification differences between these parts?

A: No. Both parts are ROHS3 compliant, REACH unaffected, and carry identical moisture sensitivity levels (MSL 1 - Unlimited).

Q: What is the 20-SOIC package specification?

A: 20-SOIC refers to a 20-pin Small Outline Integrated Circuit package with a body width of 0.295 inches (7.50mm). This is a standard surface mount package used for logic integrated circuits.