DM74LS244N Equivalent & Substitute Parts

Part Overview

The DM74LS244N is a non-inverting buffer IC with 2 elements, 4 bits per element, and 3-state output capability in a 20-DIP package. Manufactured by onsemi, this component is classified as obsolete, which necessitates identification of equivalent and substitute parts for ongoing design requirements and production continuity. The part operates within the 74LS logic family standard, maintaining compatibility with systems designed around this series.

Substiute Parts

DM74LS244N

onsemiIn Stock: 1431DM74LS244N Datasheet

Current PartRFQ

SN74LS244N

Texas InstrumentsIn Stock: 4287SN74LS244N Datasheet

DirectRFQ

SN74LS241N

Texas InstrumentsIn Stock: 20431SN74LS241N Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the DM74LS244N is determined by strict equivalence across the following critical parameters:

• Logic Type: Buffer, Non-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

Parts meeting all these parameters are classified as direct substitutes. The SN74LS244N (Texas Instruments) qualifies as a direct manufacturer substitute with identical electrical and mechanical specifications. The SN74LS241N (Texas Instruments) qualifies as a parametric equivalent, maintaining all functional and electrical parameters while differing in base product designation.

Parameter Comparison

Engineering Selection Recommendations

The SN74LS244N (Texas Instruments) is the primary substitute for the obsolete DM74LS244N. Both parts maintain identical electrical specifications and package configuration. The SN74LS244N offers the advantage of active product status and ROHS3 compliance, supporting modern supply chain and regulatory requirements.

The SN74LS241N (Texas Instruments) serves as a parametric equivalent with identical functional and electrical characteristics. This part is also active and ROHS3 compliant. Selection between SN74LS244N and SN74LS241N depends on design-specific requirements related to base product designation, though both satisfy the core electrical and mechanical parameters of the original DM74LS244N.

Frequently Asked Questions (FAQ)

Q: Can the SN74LS244N directly replace the DM74LS244N in existing designs?

A: Yes. The SN74LS244N maintains identical electrical specifications, output current ratings, supply voltage range, operating temperature range, and 20-DIP package configuration. Pin-for-pin compatibility is assured.

Q: What is the difference between the SN74LS244N and SN74LS241N?

A: Both parts are parametric equivalents with identical electrical and functional specifications. The difference lies in the base product designation (244 versus 241). Both meet all substitution criteria for the DM74LS244N.

Q: Are there compliance differences between the original and substitute parts?

A: Yes. The DM74LS244N is RoHS non-compliant, while both Texas Instruments substitutes (SN74LS244N and SN74LS241N) are ROHS3 compliant. This represents an improvement in regulatory alignment for new production.

Q: Does package configuration remain consistent across all three parts?

A: Yes. All three parts use the 20-DIP (0.300", 7.62mm) through-hole package, ensuring mechanical compatibility in existing PCB layouts.

Q: What is the inventory status of substitute parts?

A: SN74LS244N has 4200 units in stock. SN74LS241N has 20400 units in stock. Both are actively available from current manufacturers.