DM74LS245N Equivalent & Substitute Parts

Part Overview

The DM74LS245N is a non-inverting transceiver logic integrated circuit manufactured by onsemi, designed for 8-bit bidirectional data transfer applications. This component operates within a 4.75V to 5.25V supply voltage range and is housed in a 20-pin DIP package. The part is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system maintenance and new design implementations where legacy compatibility is required.

Substiute Parts

DM74LS245N

onsemiIn Stock: 1390DM74LS245N Datasheet

Current PartRFQ

SN74LS245N

Texas InstrumentsIn Stock: 5252SN74LS245N Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the DM74LS245N is determined by strict alignment of the following electrical and mechanical parameters:

• Logic Function: Non-inverting transceiver with 1 element and 8 bits per element
• Voltage Supply Range: 4.75V to 5.25V
• Output Current Specifications: 15mA (high), 24mA (low)
• Operating Temperature Range: 0°C to 70°C
• Package Configuration: 20-DIP (0.300", 7.62mm) through-hole mounting
• Base Product Number: 74LS245

The SN74LS245N from Texas Instruments meets all these criteria and is therefore a direct functional equivalent. Both parts share identical electrical performance parameters and physical packaging, enabling pin-for-pin replacement in existing circuit designs.

Parameter Comparison

Engineering Selection Recommendations

The SN74LS245N from Texas Instruments is the direct substitute for the DM74LS245N. Both components are functionally identical across all critical electrical and mechanical parameters. The primary distinction is product status: the DM74LS245N is obsolete, while the SN74LS245N remains in active production.

For new designs or system replacements, the SN74LS245N is the appropriate selection. This part maintains full compatibility with existing circuit layouts and provides the advantage of active manufacturer support and continued availability. The SN74LS245N also carries ROHS3 compliance, whereas the original DM74LS245N does not, making it suitable for applications with environmental or regulatory compliance requirements.

Frequently Asked Questions (FAQ)

Q: Can the SN74LS245N replace the DM74LS245N in existing designs?

A: Yes. The SN74LS245N is a direct pin-for-pin replacement. All electrical parameters, output current ratings, supply voltage range, operating temperature range, and physical package dimensions are identical.

Q: What is the difference between the DM74LS245N and SN74LS245N?

A: The components are electrically and mechanically equivalent. The DM74LS245N (onsemi) is obsolete, while the SN74LS245N (Texas Instruments) is in active production. The SN74LS245N also meets ROHS3 compliance standards.

Q: Are there any output type differences between these parts?

A: Both parts feature 3-state output capability, enabling control of data flow in bidirectional transceiver applications.

Q: Is the 20-DIP package identical for both parts?

A: Yes. Both the DM74LS245N and SN74LS245N use the 20-DIP (0.300", 7.62mm) through-hole package with identical pin configurations and spacing.

Q: What supply voltage range do these parts require?

A: Both parts operate within a 4.75V to 5.25V supply voltage range, making them suitable for standard 5V logic systems.

Q: Can these parts be used in new designs?

A: The SN74LS245N is recommended for new designs due to its active product status and ROHS3 compliance. The DM74LS245N, being obsolete, should be used only for legacy system maintenance or replacement applications.