DM74AS245WM Equivalent & Substitute Parts

Part Overview

The DM74AS245WM is a non-inverting transceiver IC manufactured by onsemi, designed for 8-bit data bus applications with 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. The part is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations.

Substiute Parts

DM74AS245WM

onsemiIn Stock: 882DM74AS245WM Datasheet

Current PartRFQ

SN74AS245DW

Texas InstrumentsIn Stock: 973SN74AS245DW Datasheet

DirectRFQ

SN74AS245NSR

Texas InstrumentsIn Stock: 2392SN74AS245NSR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the DM74AS245WM is determined by strict alignment across the following critical parameters:

• Logic Function: Transceiver, Non-Inverting configuration with 1 element and 8 bits per element
• Output Architecture: 3-State output capability
• Electrical Specifications: Supply voltage range 4.5V ~ 5.5V and operating temperature 0°C ~ 70°C
• Package Compatibility: 20-SOIC surface mount package with matching pinout and mechanical dimensions
• Series Alignment: 74AS logic family

Two substitute parts meet these criteria: SN74AS245DW (direct manufacturer equivalent from Texas Instruments) and SN74AS245NSR (similar variant with alternative packaging format).

Parameter Comparison

Engineering Selection Recommendations

SN74AS245DW is the primary substitute for the DM74AS245WM. Both parts share identical package dimensions (20-SOIC, 0.295" width), electrical specifications, and operating parameters. The SN74AS245DW is manufactured by Texas Instruments and maintains active product status with ROHS3 compliance certification. Output current specifications show a minor increase in low-level output current (64mA versus 48mA), which remains within acceptable tolerance for 74AS logic family applications.

SN74AS245NSR serves as an alternative substitute with identical electrical and functional characteristics. This variant is supplied in Tape & Reel packaging format and features a narrower package width (0.209" versus 0.295"). The SN74AS245NSR is also ROHS3 compliant and maintains active product status. Package width difference requires mechanical layout verification for PCB compatibility.

Both substitutes are sourced from Texas Instruments, a primary manufacturer in the 74AS logic family, ensuring long-term availability and consistent quality standards.

Frequently Asked Questions (FAQ)

Q: Can SN74AS245DW directly replace DM74AS245WM without PCB modifications?

A: Yes. The SN74AS245DW shares identical pinout, package dimensions (20-SOIC, 0.295" width), and electrical specifications with the DM74AS245WM. Direct socket substitution is possible without PCB layout changes.

Q: What is the difference between SN74AS245DW and SN74AS245NSR?

A: Both parts are functionally and electrically identical. The primary difference is packaging format: SN74AS245DW is supplied in Tube packaging, while SN74AS245NSR is supplied in Tape & Reel format. Additionally, SN74AS245NSR has a narrower package width (0.209" versus 0.295"), which may affect PCB footprint compatibility depending on layout constraints.

Q: Are there output current differences between the main part and substitutes?

A: The DM74AS245WM specifies 15mA high output and 48mA low output current. Both Texas Instruments substitutes specify 15mA high output and 64mA low output current. The increase in low output current is within 74AS logic family specifications and does not affect functional compatibility.

Q: Do the substitute parts meet current compliance standards?

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

Q: Which substitute should be selected for new designs?

A: SN74AS245DW is recommended for new designs due to standard packaging format and active product status from a primary manufacturer. SN74AS245NSR is suitable when Tape & Reel packaging and narrower package width are required for specific manufacturing or assembly processes.