MC74ACT161DR2G Equivalent & Substitute Parts

Part Overview

The MC74ACT161DR2G is a 4-bit binary counter IC manufactured by onsemi, housed in a 16-SOIC surface mount package. This synchronous counter with asynchronous reset operates at a maximum count rate of 125 MHz and is designed for digital logic applications requiring binary counting functionality. The part is currently in Last Time Buy status, indicating limited availability from the original manufacturer. Identifying equivalent and substitute parts is necessary to ensure design continuity and maintain supply chain reliability for production and maintenance applications.

Key Parameters

Parameter	Value
Logic Type	Binary Counter
Number of Bits per Element	4
Direction	Up
Reset Type	Asynchronous
Timing	Synchronous
Trigger Type	Positive Edge
Package / Case	16-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Voltage - Supply	4.5 V ~ 5.5 V

Substitute Part Grouping Explanation

Substitute parts for the MC74ACT161DR2G are qualified based on the following critical parameters that determine functional and mechanical compatibility:

Functional Parameters:

Logic Type: Binary Counter
Number of Bits per Element: 4 bits
Direction: Up counting
Reset Type: Asynchronous
Timing: Synchronous
Trigger Type: Positive Edge
Voltage Supply Range: 4.5 V ~ 5.5 V

Mechanical Parameters:

Package / Case: 16-SOIC (0.154", 3.90mm Width)
Mounting Type: Surface Mount

All identified substitute parts maintain identical functional specifications and package compatibility with the MC74ACT161DR2G, ensuring direct pin-for-pin replacement capability in existing circuit designs.

Parameter Comparison

Parameter	MC74ACT161DR2G (onsemi)	CD74ACT161M (Harris)	CD74ACT161M96 (TI)
Manufacturer	onsemi	Harris Corporation	Texas Instruments
Logic Type	Binary Counter	Binary Counter	Binary Counter
Number of Bits	4	4	4
Direction	Up	Up	Up
Reset Type	Asynchronous	Asynchronous	Asynchronous
Timing	Synchronous	Synchronous	Synchronous
Trigger Type	Positive Edge	Positive Edge	Positive Edge
Count Rate	125 MHz	80 MHz	80 MHz
Voltage - Supply	4.5 V ~ 5.5 V	4.5 V ~ 5.5 V	4.5 V ~ 5.5 V
Operating Temperature	-40°C ~ 85°C	-55°C ~ 125°C	-55°C ~ 125°C
Package / Case	16-SOIC (0.154", 3.90mm Width)	16-SOIC (0.154", 3.90mm Width)	16-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Product Status	Last Time Buy	Obsolete	Active
RoHS Status	ROHS3 Compliant	RoHS non-compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	Not specified	1 (Unlimited)

Engineering Selection Recommendations

CD74ACT161M96 (Texas Instruments) is the preferred substitute for new designs and ongoing production. This part is currently in Active status, ensuring long-term availability and supply chain stability. It maintains ROHS3 compliance and MSL Level 1 rating, meeting modern environmental and reliability standards. The CD74ACT161M96 is supplied in Tape & Reel packaging, suitable for automated assembly processes.

CD74ACT161M (Harris Corporation) is functionally compatible but carries Obsolete status and is RoHS non-compliant. This part should be used only in legacy system maintenance where supply is available and regulatory compliance is not a requirement.

Both substitute parts operate at 80 MHz maximum count rate, which is lower than the MC74ACT161DR2G specification of 125 MHz. Applications requiring the full 125 MHz performance specification must retain the original MC74ACT161DR2G or identify alternative parts with matching speed ratings.

Frequently Asked Questions (FAQ)

Q: Can CD74ACT161M96 directly replace MC74ACT161DR2G in existing designs?

A: Yes. Both parts share identical pin configurations, package dimensions (16-SOIC), and functional specifications for binary counting operation. Direct substitution is mechanically and electrically compatible.

Q: What is the difference in count rate between the main part and substitutes?

A: The MC74ACT161DR2G operates at 125 MHz maximum count rate, while both CD74ACT161M and CD74ACT161M96 operate at 80 MHz. Applications operating at frequencies below 80 MHz are unaffected by this difference. Designs requiring 125 MHz operation must use the MC74ACT161DR2G or identify alternative parts with matching speed specifications.

Q: Why is CD74ACT161M marked as Obsolete?

A: The CD74ACT161M from Harris Corporation is no longer in active production. While existing inventory may be available, long-term supply cannot be guaranteed. For new designs, CD74ACT161M96 from Texas Instruments is recommended.

Q: Are there compliance differences between the substitute parts?

A: Yes. The MC74ACT161DR2G and CD74ACT161M96 are both ROHS3 compliant with MSL Level 1 rating. The CD74ACT161M is RoHS non-compliant and does not carry an MSL specification. For applications subject to environmental or regulatory requirements, use ROHS3 compliant parts.

Q: What is the operating temperature range difference?

A: The MC74ACT161DR2G operates from -40°C to 85°C. Both substitute parts operate from -55°C to 125°C, providing a wider temperature range. Applications within the -40°C to 85°C range are fully compatible with all three parts.

Q: Which packaging format is best for automated assembly?

A: CD74ACT161M96 is supplied in Tape & Reel format, optimized for automated pick-and-place assembly. The MC74ACT161DR2G is supplied in Cut Tape format. CD74ACT161M is supplied in Tube format. Packaging selection depends on production volume and assembly equipment capabilities.

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