SN74LS240DWG4 Equivalent & Substitute Parts

Part Overview

The SN74LS240DWG4 is a Buffer, Inverting logic IC manufactured by Texas Instruments, featuring 2 elements with 4 bits per element and 3-state output capability in a 20-SOIC package. This component operates within the 4.75V to 5.25V supply voltage range and is rated for 0°C to 70°C operating temperature. The part carries Last Time Buy status, indicating discontinued production. Identifying equivalent substitute parts is necessary to maintain design continuity and ensure component availability for ongoing production and maintenance requirements.

Substiute Parts

SN74LS240DWG4

Texas InstrumentsIn Stock: 792SN74LS240DWG4 Datasheet

Current PartRFQ

SN74LS240DW

Texas InstrumentsIn Stock: 1134SN74LS240DW Datasheet

MFR RecommendedRFQ

SN74LS240DWR

Texas InstrumentsIn Stock: 3158SN74LS240DWR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SN74LS240DWG4 are qualified based on strict electrical and mechanical parameter matching. The following criteria determine substitution eligibility:

Critical Parameters for Substitution:

• Logic Type: Buffer, Inverting (2 elements, 4 bits per element)
• Output Type: 3-State
• Current Ratings: Output High 15mA, Output Low 24mA
• Supply Voltage Range: 4.75V ~ 5.25V
• Operating Temperature: 0°C ~ 70°C
• Package: 20-SOIC (0.295", 7.50mm Width)
• Mounting Type: Surface Mount
• Base Product Number: 74LS240

All identified substitutes maintain identical electrical specifications and physical packaging, ensuring direct functional equivalence. Substitutes differ only in packaging format (Tube vs. Cut Tape & Digi-Reel) and product status (Last Time Buy vs. Active).

Parameter Comparison

Engineering Selection Recommendations

SN74LS240DW is a direct substitute with identical electrical and mechanical specifications. Both the main part and this substitute carry Last Time Buy status, indicating limited future availability. Selection between SN74LS240DWG4 and SN74LS240DW depends on packaging requirements (Tube format) and current inventory levels.

SN74LS240DWR is the preferred long-term substitute. This part maintains all electrical and mechanical equivalence while carrying Active product status, ensuring continued availability. The Cut Tape & Digi-Reel packaging format provides flexibility for both high-volume and low-volume applications. Inventory availability (3100 Pcs) significantly exceeds the main part, supporting sustained production requirements.

All three parts are ROHS3 Compliant and REACH Unaffected, meeting current environmental and regulatory standards.

Frequently Asked Questions (FAQ)

Q: Can SN74LS240DW be used as a direct replacement for SN74LS240DWG4?

A: Yes. Both parts are electrically and mechanically identical, with the same logic type, output characteristics, supply voltage range, operating temperature, and 20-SOIC package. The only difference is packaging format (both Tube) and product status (both Last Time Buy).

Q: What is the advantage of using SN74LS240DWR over SN74LS240DWG4?

A: SN74LS240DWR maintains complete electrical and mechanical equivalence while carrying Active product status, ensuring long-term availability. Inventory levels are significantly higher (3100 Pcs vs. 765 Pcs), supporting sustained production. The Cut Tape & Digi-Reel packaging format accommodates both high-volume and low-volume manufacturing scenarios.

Q: Are there any electrical performance differences between these three parts?

A: No. All three parts share identical electrical specifications: 2-element, 4-bit inverting buffer with 3-state output, 15mA/24mA output current ratings, 4.75V–5.25V supply voltage, and 0°C–70°C operating temperature range.

Q: Does packaging format affect circuit performance?

A: No. Packaging format (Tube vs. Cut Tape & Digi-Reel) affects only handling, storage, and procurement logistics. Electrical and mechanical performance remains identical across all three parts.

Q: Are all three parts compliant with current environmental standards?

A: Yes. All three parts are ROHS3 Compliant, Moisture Sensitivity Level 1 (Unlimited), and REACH Unaffected, meeting current environmental and regulatory requirements.

Q: Which part should be selected for new designs?

A: SN74LS240DWR is the recommended choice for new designs due to Active product status and superior inventory availability, ensuring component continuity throughout the product lifecycle.