SN74LS240DW Equivalent & Substitute Parts

Part Overview

The SN74LS240DW is a Buffer, Inverting logic integrated circuit manufactured by Texas Instruments. This 20-SOIC surface mount device provides 2 elements with 4 bits per element and 3-state output capability, operating at 4.75V to 5.25V supply voltage across the 0°C to 70°C temperature range. The SN74LS240DW is classified as Last Time Buy, indicating limited availability and the necessity to identify equivalent substitute components for ongoing design requirements and production continuity.

Substiute Parts

SN74LS240DW

Texas InstrumentsIn Stock: 1134SN74LS240DW Datasheet

Current PartRFQ

SN74LS240DWR

Texas InstrumentsIn Stock: 3158SN74LS240DWR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SN74LS240DW are determined by strict equivalence across the following critical parameters:

• Logic Type: Buffer, Inverting
• Number of Elements: 2
• Number of Bits per Element: 4
• Output Type: 3-State
• Current - Output High, Low: 15mA, 24mA
• 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
• Base Product Number: 74LS240

Parts meeting all these parameters are electrically and mechanically interchangeable. Packaging format differences (Tube versus Cut Tape & Digi-Reel) do not affect functional compatibility.

Parameter Comparison

Engineering Selection Recommendations

The SN74LS240DWR is the direct substitute for the SN74LS240DW. Both parts are manufactured by Texas Instruments and share identical electrical and mechanical specifications across all critical parameters. The SN74LS240DWR maintains Active product status, ensuring continued availability and supply chain stability compared to the Last Time Buy status of the SN74LS240DW. Both parts carry ROHS3 compliance and MSL Level 1 certification, meeting environmental and moisture sensitivity requirements. The packaging format difference (Cut Tape & Digi-Reel versus Tube) does not affect functional performance or PCB assembly compatibility.

Frequently Asked Questions (FAQ)

Q: Can the SN74LS240DWR replace the SN74LS240DW in existing designs?

A: Yes. The SN74LS240DWR is electrically and mechanically equivalent to the SN74LS240DW. All functional parameters, electrical characteristics, and package dimensions are identical. Direct substitution is supported without design modification.

Q: What is the difference between the SN74LS240DW and SN74LS240DWR?

A: The primary difference is product status and packaging format. The SN74LS240DW is Last Time Buy with Tube packaging, while the SN74LS240DWR is Active with Cut Tape & Digi-Reel packaging. Electrical and mechanical specifications are identical.

Q: Are there any compatibility concerns with the 20-SOIC package?

A: No. Both parts use the identical 20-SOIC (0.295", 7.50mm Width) package. PCB footprints, solder reflow profiles, and assembly processes remain unchanged.

Q: Do both parts meet the same compliance standards?

A: Yes. Both the SN74LS240DW and SN74LS240DWR are ROHS3 compliant, REACH unaffected, and carry MSL Level 1 certification. Compliance documentation is equivalent.

Q: Which part should be selected for new designs?

A: The SN74LS240DWR should be selected for new designs due to its Active product status, ensuring long-term availability and supply chain continuity.