DM74LS240N Equivalent & Substitute Parts

Part Overview

The DM74LS240N is a Buffer, Inverting logic IC with 2 elements, 4 bits per element, and 3-state output capability. Manufactured by onsemi in a 20-PDIP 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 The product status is obsolete, making identification of equivalent and substitute parts essential for ongoing system support and component procurement.

Substiute Parts

DM74LS240N

onsemiIn Stock: 1358DM74LS240N Datasheet

Current PartRFQ

SN74LS240N

onsemiIn Stock: 2008SN74LS240N Datasheet

DirectRFQ

SN74LS240NE4

Texas InstrumentsIn Stock: 702SN74LS240NE4 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the DM74LS240N are identified based on 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-DIP (0.300", 7.62mm)
• Mounting Type: Through Hole

All identified substitutes maintain identical electrical and mechanical specifications, ensuring direct functional compatibility in circuit applications.

Parameter Comparison

Engineering Selection Recommendations

SN74LS240N (onsemi) provides direct substitution with identical electrical and mechanical specifications. Both the DM74LS240N and SN74LS240N share obsolete product status and RoHS non-compliant classification.

SN74LS240NE4 (Texas Instruments) offers parametric equivalence with all critical electrical and mechanical parameters matching the main part. This substitute carries active product status and ROHS3 compliance, providing advantages for new designs or systems requiring current manufacturing support and regulatory compliance documentation.

Frequently Asked Questions (FAQ)

Q: Can SN74LS240N be used as a direct replacement for DM74LS240N?

A: Yes. Both parts are manufactured to the 74LS240 base product specification with identical logic type, element count, bit configuration, output type, current ratings, supply voltage range, operating temperature, and 20-DIP package dimensions.

Q: What is the difference between SN74LS240N and SN74LS240NE4?

A: Both parts are parametrically equivalent across all electrical and mechanical specifications. SN74LS240NE4 is supplied in tube packaging and carries active product status with ROHS3 compliance, while SN74LS240N is obsolete and RoHS non-compliant.

Q: Are there any package or pinout differences between these substitutes?

A: No. All three parts use the 20-DIP (0.300", 7.62mm) package with through-hole mounting, ensuring identical PCB footprint and pinout compatibility.

Q: Which substitute should be selected for new designs?

A: Selection depends on regulatory and supply chain requirements. SN74LS240NE4 is recommended where active product status and ROHS3 compliance are required. For legacy system maintenance, SN74LS240N provides equivalent functionality.

Q: Do these substitutes have identical electrical performance?

A: Yes. All three parts maintain identical current output ratings (15mA high, 24mA low), supply voltage range (4.75V to 5.25V), and operating temperature range (0°C to 70°C).