DM74ALS640AWMX Equivalent & Substitute Parts

Part Overview

The DM74ALS640AWMX is a logic transceiver IC manufactured by onsemi, featuring inverting functionality with 1 element and 8 bits per element. The device provides 3-state output capability and operates within a 4.5V to 5.5V supply voltage range. With an obsolete product status, identifying functionally equivalent alternatives is necessary for ongoing design support and procurement continuity.

Substiute Parts

DM74ALS640AWMX

onsemiIn Stock: 1117DM74ALS640AWMX Datasheet

Current PartRFQ

SN74ALS640BDW

Texas InstrumentsIn Stock: 2058SN74ALS640BDW Datasheet

DirectRFQ

SN74ALS640B-1DW

Texas InstrumentsIn Stock: 1155SN74ALS640B-1DW Datasheet

SimilarRFQ

SN74ALS640B-1NSR

Texas InstrumentsIn Stock: 3545SN74ALS640B-1NSR Datasheet

SimilarRFQ

SN74ALS640BNSR

Texas InstrumentsIn Stock: 3399SN74ALS640BNSR Datasheet

SimilarRFQ

SN74ALS640B-1DWR

Texas InstrumentsIn Stock: 800SN74ALS640B-1DWR Datasheet

Parametric EquivalentRFQ

SN74ALS640BDWR

Texas InstrumentsIn Stock: 12117SN74ALS640BDWR Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the DM74ALS640AWMX is determined by strict equivalence across the following critical parameters:

• Logic Type: Transceiver, Inverting
• Number of Elements: 1
• Number of Bits per Element: 8
• Output Type: 3-State
• Current - Output High, Low: 15mA, 24mA
• Voltage - Supply: 4.5V ~ 5.5V
• Operating Temperature: 0°C ~ 70°C (TA)
• Mounting Type: Surface Mount
• Base Product Number: 74ALS640
• Moisture Sensitivity Level (MSL): 1 (Unlimited)

Substitute parts are categorized as follows:

Direct Manufacturer Substitute: SN74ALS640BDW (Texas Instruments) — identical electrical specifications and 20-SOIC package footprint.

Similar Manufacturer Substitutes: SN74ALS640B-1DW and SN74ALS640B-1NSR (Texas Instruments) — functionally equivalent with package variations (20-SOIC at 0.295" width vs. 20-SO at 0.209" width).

Parametric Equivalents: SN74ALS640B-1DWR and SN74ALS640BDWR (Texas Instruments) — identical electrical and mechanical specifications with active product status and RoHS3 compliance.

Parameter Comparison

Engineering Selection Recommendations

For applications currently using the DM74ALS640AWMX, the following selection criteria apply based on product status and compliance:

Primary Recommendation: SN74ALS640B-1DWR or SN74ALS640BDWR (Texas Instruments) — both parts maintain active product status, provide RoHS3 compliance, and deliver identical electrical and mechanical specifications with 20-SOIC packaging at 0.295" width. These parts ensure long-term availability and regulatory compliance.

Secondary Option: SN74ALS640BDW (Texas Instruments) — direct manufacturer substitute with identical specifications; however, product status is Last Time Buy, indicating limited future availability.

Package-Variant Alternatives: SN74ALS640B-1NSR or SN74ALS640BNSR (Texas Instruments) — functionally equivalent with active product status and RoHS3 compliance. These parts use 20-SO packaging at 0.209" width, requiring PCB layout adjustment but offering superior long-term availability.

All substitute parts maintain identical electrical performance, supply voltage range, output current specifications, and operating temperature range. Selection should prioritize active product status parts for new designs and long-term production support.

Frequently Asked Questions (FAQ)

Q: Can SN74ALS640B-1NSR be used as a direct replacement for DM74ALS640AWMX?

A: SN74ALS640B-1NSR is functionally equivalent in all electrical parameters but uses 20-SO packaging (0.209" width) instead of 20-SOIC (0.295" width). PCB footprint modification is required. The part is electrically compatible and offers active product status.

Q: What is the difference between SN74ALS640BDW and SN74ALS640B-1DWR?

A: Both parts share identical electrical specifications and 20-SOIC packaging. SN74ALS640B-1DWR has active product status with RoHS3 compliance, while SN74ALS640BDW is Last Time Buy status. For new designs, SN74ALS640B-1DWR is preferred.

Q: Are all substitute parts RoHS3 compliant?

A: All Texas Instruments substitute parts listed are RoHS3 compliant. The original DM74ALS640AWMX does not specify RoHS status.

Q: Which substitute part offers the best long-term availability?

A: SN74ALS640B-1DWR and SN74ALS640BDWR both maintain active product status with the highest inventory levels (774 Pcs and 12,088 Pcs respectively), ensuring sustained availability for production requirements.

Q: Do package variations affect electrical performance?

A: No. The 20-SOIC and 20-SO packages contain identical die and electrical specifications. Package selection depends on PCB layout constraints and manufacturing capabilities.