DM74AS245WMX Equivalent & Substitute Parts

Part Overview

The DM74AS245WMX is a non-inverting transceiver logic IC manufactured by onsemi, featuring 1 element with 8 bits per element and 3-state output capability. This component operates within a 4.5V to 5.5V supply voltage range and is housed in a 20-SOIC package with 0.295" (7.50mm) width. The part is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations.

Substiute Parts

DM74AS245WMX

onsemiIn Stock: 1113DM74AS245WMX Datasheet

Current PartRFQ

SN74AS245DW

Texas InstrumentsIn Stock: 973SN74AS245DW Datasheet

SimilarRFQ

SN74AS245NSR

Texas InstrumentsIn Stock: 2392SN74AS245NSR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the DM74AS245WMX is determined by strict equivalence across the following critical parameters:

• Logic type and function: Transceiver, Non-Inverting
• Element and bit configuration: 1 element, 8 bits per element
• Output architecture: 3-State output
• Supply voltage range: 4.5V ~ 5.5V
• Operating temperature range: 0°C ~ 70°C
• Mounting technology: Surface Mount
• Package family: 20-SOIC

The identified substitute parts maintain functional and electrical compatibility within these parameters. Variations in output current specifications and package width dimensions are noted but do not preclude substitution when circuit design margins accommodate such differences.

Parameter Comparison

Engineering Selection Recommendations

Both SN74AS245DW and SN74AS245NSR are active-status alternatives manufactured by Texas Instruments and maintain full functional equivalence to the obsolete DM74AS245WMX across all critical electrical and logical parameters. Both substitute parts are ROHS3 compliant, providing regulatory advantage over the original component.

The SN74AS245DW is packaged in tube format and maintains identical package dimensions (20-SOIC, 0.295" width) to the original part, enabling direct physical substitution in existing PCB layouts without modification.

The SN74AS245NSR is supplied in Tape & Reel format with a narrower package width (20-SOIC, 0.209" width). While functionally equivalent, this dimensional difference requires PCB footprint verification prior to implementation.

Output current specifications for the substitute parts (64mA low-side current) exceed the original specification (48mA), representing improved performance margin and enhanced design robustness.

Frequently Asked Questions (FAQ)

Q: Can SN74AS245DW and SN74AS245NSR be used interchangeably with DM74AS245WMX?

A: Both parts are functionally equivalent across all critical electrical parameters: logic type, element configuration, bit width, output architecture, supply voltage, and operating temperature. Substitution is valid from an electrical standpoint. Physical substitution requires package dimension verification.

Q: What is the difference between SN74AS245DW and SN74AS245NSR?

A: Both parts are electrically identical. The primary difference is packaging format and physical dimensions. SN74AS245DW uses a 20-SOIC package with 0.295" width (matching the original), while SN74AS245NSR uses a narrower 20-SOIC package with 0.209" width and is supplied on tape and reel rather than in tubes.

Q: Why do the substitute parts have higher output low-side current (64mA vs 48mA)?

A: The increased current specification represents a design improvement in the Texas Instruments version. This higher capability does not create compatibility issues and provides additional performance margin for the circuit.

Q: Are the substitute parts RoHS compliant?

A: Yes, both SN74AS245DW and SN74AS245NSR are ROHS3 compliant, meeting current environmental and regulatory requirements.

Q: Can I use SN74AS245NSR as a direct PCB replacement?

A: SN74AS245NSR is electrically equivalent but has different package dimensions (narrower width). PCB footprint compatibility must be verified before implementation. If the PCB footprint is designed for the wider 0.295" package, physical substitution is not possible without layout modification.