DM74AS163M Equivalent & Substitute Parts

Part Overview

The DM74AS163M 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 functionally equivalent alternatives essential for ongoing system support and new design implementations.

Substiute Parts

DM74AS163M

onsemiIn Stock: 674DM74AS163M Datasheet

Current PartRFQ

SN74AS163D

Texas InstrumentsIn Stock: 906SN74AS163D Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the DM74AS163M is determined by strict equivalence across the following parameters:

• Logic Type: Binary Counter (identical function)
• Number of Bits per Element: 4 (identical bit width)
• Direction: Up (identical counting direction)
• Reset Type: Synchronous (identical reset behavior)
• Timing: Synchronous (identical timing architecture)
• Trigger Type: Positive Edge (identical trigger mechanism)
• Voltage Supply Range: 4.5V ~ 5.5V (identical electrical specification)
• Operating Temperature: 0°C ~ 70°C (identical thermal range)
• Package / Case: 16-SOIC (identical physical footprint)
• Mounting Type: Surface Mount (identical mounting method)
• Series: 74AS (identical logic family)

The SN74AS163D from Texas Instruments meets all these criteria and is therefore a direct functional equivalent. Differences in count rate (40 MHz vs. 75 MHz) and product status do not preclude substitution when the application's timing requirements are satisfied by the substitute part's specifications.

Parameter Comparison

Engineering Selection Recommendations

The SN74AS163D is a direct substitute for the DM74AS163M based on functional equivalence across all critical parameters. The substitute part is manufactured by Texas Instruments and maintains active product status, ensuring ongoing availability and supply chain continuity.

The SN74AS163D carries RoHS3 compliance, providing environmental regulatory alignment for new designs and manufacturing processes. Both parts share identical electrical specifications, package geometry, and mounting characteristics, enabling direct replacement without circuit redesign.

The count rate differential (40 MHz vs. 75 MHz) must be evaluated against application timing requirements. Applications operating at or below 40 MHz encounter no performance limitation. Applications requiring operation above 40 MHz require confirmation that the SN74AS163D's maximum count rate satisfies system specifications.

Frequently Asked Questions (FAQ)

Q: Can the SN74AS163D replace the DM74AS163M in existing designs?

A: Yes. The SN74AS163D is functionally equivalent across all critical parameters: logic type, bit width, reset behavior, timing architecture, trigger mechanism, supply voltage range, operating temperature, package footprint, and mounting type. Direct substitution is possible without circuit modification.

Q: What is the significance of the count rate difference between these parts?

A: The DM74AS163M specifies a maximum count rate of 75 MHz, while the SN74AS163D specifies 40 MHz. This difference reflects manufacturing process variations between onsemi and Texas Instruments. Applications operating at or below 40 MHz are unaffected. Applications requiring higher count rates must confirm that 40 MHz satisfies system timing requirements before substitution.

Q: Are the physical packages identical?

A: Yes. Both parts use the 16-SOIC (0.154", 3.90mm Width) surface mount package. PCB footprints and placement procedures are identical.

Q: What is the product status significance?

A: The DM74AS163M is classified as obsolete, indicating onsemi has discontinued production. The SN74AS163D maintains active status, ensuring continued availability from Texas Instruments. Substitution addresses long-term supply security for applications requiring this counter IC.

Q: Are there compliance differences between these parts?

A: The SN74AS163D carries RoHS3 compliance certification. Both parts are REACH Unaffected and classified under ECCN EAR99. The substitute part's RoHS3 status supports environmental regulatory requirements in manufacturing and end-of-life disposal.