DM74LS253N Equivalent & Substitute Parts

Part Overview

The DM74LS253N is a dual 4-line to 1-line multiplexer logic IC manufactured by onsemi, housed in a 16-pin DIP package. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing design work and production requirements. The 74LS series multiplexer performs data selection and routing functions in digital logic circuits, with two independent 4:1 multiplexer circuits integrated on a single device.

Substiute Parts

DM74LS253N

onsemiIn Stock: 2478DM74LS253N Datasheet

Current PartRFQ

SN74LS253N

MotorolaIn Stock: 4235SN74LS253N Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the DM74LS253N is determined by strict alignment of the following electrical and mechanical parameters:

• Circuit configuration: 2 x 4:1 multiplexer topology
• Package type: 16-DIP (0.300", 7.62mm) with identical pinout
• Voltage supply range: 4.75V ~ 5.25V single supply
• Operating temperature range: 0°C ~ 70°C
• Output current specifications: High and low output current ratings
• Mounting method: Through-hole technology

The SN74LS253N manufactured by Motorola meets all substitution criteria, maintaining functional and electrical equivalence within the specified parameter boundaries.

Parameter Comparison

Engineering Selection Recommendations

The SN74LS253N is a direct functional equivalent to the DM74LS253N. Both devices share identical circuit topology, package geometry, and primary electrical specifications. The SN74LS253N carries active product status, ensuring continued availability and supply chain reliability compared to the obsolete DM74LS253N.

The output low current specification differs between the two parts (24mA for DM74LS253N versus 8mA for SN74LS253N). This variance must be evaluated within the context of the specific application's load requirements. Both values remain within standard 74LS logic family operating parameters.

The SN74LS253N maintains REACH compliance status equivalent to the original part, supporting regulatory requirements for new designs and production applications.

Frequently Asked Questions (FAQ)

Q: Can the SN74LS253N directly replace the DM74LS253N in existing designs?

A: Yes. Both parts share identical pinout, package dimensions (16-DIP), and circuit configuration (2 x 4:1 multiplexer). Direct socket substitution is mechanically and electrically compatible.

Q: What is the significance of the output low current difference (24mA vs. 8mA)?

A: The output low current rating defines the maximum current the device can sink at the output. The SN74LS253N specification of 8mA is lower than the DM74LS253N at 24mA. Circuit designs must ensure load requirements do not exceed the SN74LS253N's 8mA sinking capability.

Q: Are there supply voltage or temperature range differences?

A: No. Both parts operate identically across the 4.75V to 5.25V supply range and 0°C to 70°C temperature range.

Q: Why is the DM74LS253N listed as obsolete?

A: Obsolete status indicates the manufacturer has discontinued production. The SN74LS253N maintains active status, providing a viable path for ongoing component sourcing and design continuity.

Q: Are there compliance or regulatory differences between these parts?

A: Both parts maintain REACH Unaffected status. The DM74LS253N is RoHS non-compliant, while the SN74LS253N compliance status follows standard Motorola specifications for the 74LS series.