DM74AS163MX Equivalent & Substitute Parts

Part Overview

The DM74AS163MX is a 4-bit binary counter IC manufactured by onsemi, housed in a 16-SOIC surface mount package. This component functions as a synchronous, positive edge-triggered counter with a maximum count rate of 75 MHz and operates within a 4.5V to 5.5V supply voltage range. The part is classified as obsolete, making identification of compatible substitute components essential for ongoing system support and new design implementations.

Substiute Parts

DM74AS163MX

onsemiIn Stock: 917DM74AS163MX Datasheet

Current PartRFQ

SN74AS163D

Texas InstrumentsIn Stock: 906SN74AS163D Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the DM74AS163MX is determined by strict adherence to the following electrical and mechanical parameters:

• Logic Function: Binary counter with 4-bit capacity, single element configuration
• Trigger Characteristics: Positive edge-triggered, synchronous reset and timing
• Electrical Specifications: 4.5V to 5.5V supply voltage compatibility
• Package Compatibility: 16-SOIC surface mount package with identical pin configuration
• Temperature Range: 0°C to 70°C operating window
• Base Product Series: 74AS logic family designation

The SN74AS163D from Texas Instruments meets all mandatory substitution criteria within these parameters.

Parameter Comparison

Engineering Selection Recommendations

The SN74AS163D serves as a direct functional substitute for the DM74AS163MX. Both components share identical logic architecture, pin configuration, and electrical operating parameters within the 74AS logic family. The SN74AS163D maintains active product status with ROHS3 compliance, providing long-term availability and regulatory alignment for new designs and legacy system replacements.

The count rate differential (75 MHz versus 40 MHz) reflects manufacturing process variations between onsemi and Texas Instruments implementations. Applications operating below 40 MHz encounter no functional constraints. Systems requiring operation above 40 MHz must evaluate timing-critical signal paths against the SN74AS163D specification.

Frequently Asked Questions (FAQ)

Q: Can the SN74AS163D replace the DM74AS163MX in existing designs?

A: Yes. Both components share identical pin assignments, package geometry, and core electrical specifications. The 16-SOIC package footprint is mechanically and electrically interchangeable.

Q: What is the significance of the count rate difference?

A: The DM74AS163MX specifies 75 MHz maximum count rate, while the SN74AS163D specifies 40 MHz. This reflects different manufacturing processes. For applications operating at or below 40 MHz, this difference is not a limiting factor. Applications requiring higher count rates must evaluate system timing requirements against the SN74AS163D maximum specification.

Q: Are there compliance or regulatory differences?

A: The SN74AS163D carries ROHS3 compliance certification. The DM74AS163MX RoHS status is not specified in available documentation. Both components are REACH Unaffected and carry EAR99 export classification.

Q: Why is the DM74AS163MX classified as obsolete?

A: Obsolete status indicates the manufacturer has discontinued production. The SN74AS163D, maintained in active production by Texas Instruments, provides continuity for applications requiring 74AS163 binary counter functionality.

Q: Are package and pinout configurations identical?

A: Yes. Both components use the 16-SOIC (0.154", 3.90mm Width) surface mount package with identical pin assignments and electrical characteristics within the specified operating parameters.