74ACT161SJ Binary Counter Equivalent & Substitute Parts

Part Overview

The 74ACT161SJ is a 4-bit binary counter IC manufactured by onsemi, housed in a 16-SOP surface mount package. This logic component features synchronous timing with asynchronous reset, operating at a count rate of 125 MHz and supporting positive edge triggering. The part is currently classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Specification
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
Count Rate	125 MHz
Voltage Supply Range	4.5 V ~ 5.5 V
Operating Temperature Range	-40°C ~ 85°C
Mounting Type	Surface Mount
Package Type	16-SOIC / 16-SOP

Substitute Part Grouping Explanation

Substitution eligibility for the 74ACT161SJ is determined by the following core parameters:

Logic Function: All substitute parts must be 4-bit binary counters with identical element count and bit configuration
Electrical Characteristics: Supply voltage range (4.5 V ~ 5.5 V), trigger type (positive edge), reset type (asynchronous), and timing (synchronous) must match
Package Compatibility: Surface mount packages in 16-pin SOIC or SOP configurations are acceptable
Series Alignment: All parts belong to the 74ACT logic series

The three identified substitute parts meet these core criteria. Package variations (16-SOP vs. 16-SOIC) are mechanically compatible within surface mount assembly processes. Differences in count rate specifications and operating temperature ranges do not preclude substitution when the application requirements fall within the substitute part's rated parameters.

Parameter Comparison

Parameter	74ACT161SJ (onsemi)	MC74ACT161DR2G (onsemi)	CD74ACT161M (Harris)	CD74ACT161M96 (TI)
Logic Type	Binary Counter	Binary Counter	Binary Counter	Binary Counter
Number of Bits	4	4	4	4
Number of Elements	1	1	1	1
Direction	Up	Up	Up	Up
Reset Type	Asynchronous	Asynchronous	Asynchronous	Asynchronous
Timing	Synchronous	Synchronous	Synchronous	Synchronous
Trigger Type	Positive Edge	Positive Edge	Positive Edge	Positive Edge
Count Rate	125 MHz	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	4.5 V ~ 5.5 V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-55°C ~ 125°C	-55°C ~ 125°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package	16-SOP (5.30mm)	16-SOIC (3.90mm)	16-SOIC (3.90mm)	16-SOIC (3.90mm)
Product Status	Obsolete	Last Time Buy	Obsolete	Active
RoHS Compliance	Not specified	ROHS3 Compliant	Non-compliant	ROHS3 Compliant

Engineering Selection Recommendations

CD74ACT161M96 (Texas Instruments) is the primary substitute for new designs and long-term procurement. This part carries Active product status, ensuring continued availability and manufacturer support. It meets ROHS3 compliance requirements and maintains full electrical compatibility with the 74ACT161SJ across all core functional parameters. The extended operating temperature range (-55°C ~ 125°C) provides additional margin for demanding applications.

MC74ACT161DR2G (onsemi) serves as an alternative substitute with Last Time Buy status. This part maintains identical electrical specifications to the 74ACT161SJ, including the 125 MHz count rate and -40°C ~ 85°C operating range. ROHS3 compliance and current inventory availability make this suitable for near-term replacements.

CD74ACT161M (Harris Corporation) is classified as obsolete with non-compliant RoHS status. While electrically compatible, this part is not recommended for new designs or long-term applications due to product status and regulatory compliance limitations.

Frequently Asked Questions (FAQ)

Q: Can the 74ACT161SJ be directly replaced with CD74ACT161M96?

A: Yes. Both parts share identical logic function, electrical specifications, and pin configuration. The 16-SOIC package of the CD74ACT161M96 is mechanically compatible with 16-SOP footprints in surface mount assembly. The extended operating temperature range of the CD74ACT161M96 (-55°C ~ 125°C) encompasses the 74ACT161SJ specification (-40°C ~ 85°C).

Q: What is the difference between the 16-SOP and 16-SOIC packages?

A: Both are 16-pin surface mount packages with identical pin assignments. The primary difference is body width: 16-SOP measures 5.30mm while 16-SOIC measures 3.90mm. PCB footprints must accommodate the specific package width, though both use the same lead pitch and pin spacing.

Q: Are there any count rate limitations when substituting with CD74ACT161M or CD74ACT161M96?

A: Both substitute parts operate at 80 MHz maximum count rate, compared to the 74ACT161SJ at 125 MHz. Applications requiring count rates above 80 MHz cannot use these substitutes. For applications operating at or below 80 MHz, both parts are fully compatible.

Q: Which substitute part should be selected for new production designs?

A: CD74ACT161M96 is recommended for new designs. It maintains Active product status, ensuring long-term availability and manufacturer support. ROHS3 compliance aligns with current regulatory requirements, and the extended temperature range provides design margin.

Q: Is the MC74ACT161DR2G suitable for applications requiring the full 125 MHz count rate?

A: Yes. The MC74ACT161DR2G maintains the 125 MHz count rate specification of the original 74ACT161SJ, making it suitable for high-speed counting applications. However, Last Time Buy status indicates limited future availability.

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