DM74ALS646WMX Equivalent & Substitute Parts

Part Overview

The DM74ALS646WMX 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 24-SOP package. The part is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and production continuity.

Substiute Parts

DM74ALS646WMX

onsemiIn Stock: 2920DM74ALS646WMX Datasheet

Current PartRFQ

SN74ALS646ADW

Texas InstrumentsIn Stock: 903SN74ALS646ADW Datasheet

DirectRFQ

SN74ALS646ADWR

Texas InstrumentsIn Stock: 777SN74ALS646ADWR Datasheet

Parametric EquivalentRFQ

SN74ALS652ADWR

Texas InstrumentsIn Stock: 2918SN74ALS652ADWR Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the DM74ALS646WMX is determined by strict equivalence across the following critical parameters:

• Logic Type: Transceiver, Non-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)
• Series: 74ALS
• Package / Case: 24-SOIC (0.295", 7.50mm Width)

All identified substitute parts maintain identical electrical and mechanical specifications. Packaging format differences (tube, tape & reel) represent distribution variations only and do not affect functional compatibility. The SN74ALS646ADW, SN74ALS646ADWR, and SN74ALS652ADWR are all qualified as direct parametric equivalents.

Parameter Comparison

Engineering Selection Recommendations

All three Texas Instruments substitutes—SN74ALS646ADW, SN74ALS646ADWR, and SN74ALS652ADWR—are active production parts with identical electrical and mechanical specifications to the obsolete DM74ALS646WMX. The primary distinction among these alternatives is packaging format:

• SN74ALS646ADW is supplied in tube packaging, suitable for manual assembly or small-volume applications.
• SN74ALS646ADWR is supplied in tape & reel format, optimized for automated pick-and-place assembly.
• SN74ALS652ADWR is supplied in tape & reel format and represents an alternative base product number within the same functional class.

All three parts carry ROHS3 compliance certification and maintain REACH unaffected status, ensuring regulatory alignment with modern manufacturing standards. Selection should be based on procurement requirements, assembly methodology, and inventory management practices rather than functional performance, as all parts are electrically and mechanically interchangeable.

Frequently Asked Questions (FAQ)

Q: Can SN74ALS646ADW, SN74ALS646ADWR, and SN74ALS652ADWR be used interchangeably with DM74ALS646WMX?

A: Yes. All three parts maintain identical electrical specifications, output characteristics, supply voltage range, operating temperature range, and 24-SOIC package dimensions. Functional substitution is direct.

Q: What is the difference between the packaging formats (tube, tape & reel)?

A: Packaging format affects distribution and assembly methodology only. Tube packaging is used for manual or low-volume assembly processes. Tape & reel packaging is optimized for automated assembly equipment. The electronic components themselves are identical.

Q: Why are there two different base product numbers (74ALS646 and 74ALS652)?

A: Both base product numbers represent non-inverting transceiver logic ICs within the 74ALS series with identical electrical and mechanical parameters for this application. The difference in base product number does not affect functional compatibility or performance characteristics.

Q: Is the DM74ALS646WMX still available?

A: The DM74ALS646WMX is classified as obsolete. Texas Instruments SN74ALS646ADW, SN74ALS646ADWR, and SN74ALS652ADWR are active production alternatives with full parametric equivalence.

Q: Are there any compliance or regulatory differences between the main part and substitutes?

A: The substitute parts carry ROHS3 compliance certification. All parts maintain REACH unaffected status and EAR99 export classification. No regulatory barriers exist to substitution.

Q: Can I use these parts in new designs?

A: Yes. The Texas Instruments substitutes are active production parts suitable for new designs. They provide long-term availability and supply chain stability compared to the obsolete DM74ALS646WMX.