MC74ACT161DR2 Equivalent & Substitute Parts

Part Overview

The MC74ACT161DR2 is a 4-bit binary counter logic IC manufactured by onsemi, housed in a 16-SOIC surface mount package. This component functions as a synchronous counter with asynchronous reset, designed for positive edge triggering applications. The part is currently classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity.

Key Parameters

Parameter	Value
Base Product Number	74ACT161
Logic Type	Binary Counter
Number of Bits per Element	4
Number of Elements	1
Direction	Up
Reset Type	Asynchronous
Timing	Synchronous
Trigger Type	Positive Edge
Package / Case	16-SOIC (0.154", 3.90mm Width)
Voltage - Supply	4.5 V ~ 5.5 V
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitution for the MC74ACT161DR2 is determined by strict adherence to the following electrical and mechanical parameters:

Base product number must be 74ACT161
Logic type must be binary counter with 4 bits per element
Package must be 16-SOIC with identical physical dimensions
Supply voltage range must be 4.5 V ~ 5.5 V
Mounting type must be surface mount
Counter direction must be up with positive edge triggering
Reset must be asynchronous with synchronous timing

The substitute parts identified below meet these core requirements and are classified as direct or similar alternatives based on manufacturer, product status, and compliance certifications.

Parameter Comparison

Parameter	MC74ACT161DR2 (onsemi)	MC74ACT161DR2G (onsemi)	CD74ACT161M (Harris)	CD74ACT161M96 (TI)
Manufacturer	onsemi	onsemi	Harris Corporation	Texas Instruments
Series	74ACT	74ACT	74ACT	74ACT
Logic Type	Binary Counter	Binary Counter	Binary Counter	Binary Counter
Number of Bits	4	4	4	4
Package / Case	16-SOIC	16-SOIC	16-SOIC	16-SOIC
Voltage - Supply	4.5 V ~ 5.5 V	4.5 V ~ 5.5 V	4.5 V ~ 5.5 V	4.5 V ~ 5.5 V
Count Rate	125 MHz	125 MHz	80 MHz	80 MHz
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-55°C ~ 125°C	-55°C ~ 125°C
Product Status	Obsolete	Last Time Buy	Obsolete	Active
RoHS Status	Non-compliant	ROHS3 Compliant	Non-compliant	ROHS3 Compliant
Packaging Type	Tube	Cut Tape (CT)	Tube	Tape & Reel (TR)

Engineering Selection Recommendations

MC74ACT161DR2G (onsemi) is the primary direct substitute. It maintains identical electrical specifications and package configuration as the original MC74ACT161DR2, with the advantage of ROHS3 compliance and Last Time Buy status, providing extended procurement availability.

CD74ACT161M96 (Texas Instruments) is the recommended long-term substitute. This part is currently active in production, ensuring sustained availability. It meets all core electrical and mechanical requirements, with ROHS3 compliance. The extended operating temperature range (-55°C ~ 125°C) provides broader application flexibility compared to the original part's -40°C ~ 85°C range. Count rate specification of 80 MHz is lower than the original 125 MHz; this difference is acceptable for applications not requiring the higher frequency performance.

CD74ACT161M (Harris Corporation) is an alternative substitute meeting all core electrical and mechanical parameters. However, this part is obsolete and non-compliant with RoHS regulations, making it less suitable for new designs or procurement planning.

Frequently Asked Questions (FAQ)

Q: Can MC74ACT161DR2G be used as a direct replacement for MC74ACT161DR2?

A: Yes. MC74ACT161DR2G is a direct equivalent manufactured by onsemi with identical electrical specifications, package configuration, and pin compatibility. The primary difference is improved RoHS3 compliance status.

Q: What is the significance of the count rate difference between MC74ACT161DR2 (125 MHz) and CD74ACT161M96 (80 MHz)?

A: Count rate specifies the maximum frequency at which the counter can operate reliably. Applications operating below 80 MHz will function identically with either part. Applications requiring operation above 80 MHz must use MC74ACT161DR2 or MC74ACT161DR2G.

Q: Are all substitute parts pin-compatible with the original MC74ACT161DR2?

A: Yes. All substitute parts use the 16-SOIC package with identical pinout, enabling direct board-level replacement without circuit modification.

Q: Why is CD74ACT161M96 recommended despite lower count rate specifications?

A: CD74ACT161M96 is the only substitute currently in active production status, ensuring long-term procurement availability. Its 80 MHz count rate meets the majority of industrial applications. For designs requiring 125 MHz operation, MC74ACT161DR2G remains available as Last Time Buy inventory.

Q: What packaging options are available for these substitutes?

A: MC74ACT161DR2G is supplied in Cut Tape (CT) format. CD74ACT161M96 is supplied in Tape & Reel (TR) format. Both formats are suitable for automated assembly processes. CD74ACT161M is supplied in Tube format.

Q: Are there RoHS compliance considerations for substitute selection?

A: MC74ACT161DR2 and CD74ACT161M are RoHS non-compliant. MC74ACT161DR2G and CD74ACT161M96 are ROHS3 compliant. For applications subject to RoHS regulations, select MC74ACT161DR2G or CD74ACT161M96.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message