74ACT161SJX Equivalent & Substitute Parts

Part Overview

The 74ACT161SJX is a 4-bit binary counter IC manufactured by onsemi, housed in a 16-SOP surface mount package. This component functions as a synchronous counter with asynchronous reset, designed for positive edge triggering applications. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing production and maintenance applications requiring this logic function.

Key Parameters

Parameter	Value
Logic Type	Binary Counter
Number of Bits per Element	4
Number of Elements	1
Direction	Up
Reset	Asynchronous
Timing	Synchronous
Trigger Type	Positive Edge
Voltage - Supply	4.5 V ~ 5.5 V
Mounting Type	Surface Mount
Series	74ACT

Substitute Part Grouping Explanation

Substitution for the 74ACT161SJX is determined by functional equivalence within the 74ACT logic family. The core substitution criteria are:

Logic type: Binary counter with identical 4-bit configuration
Functional characteristics: Asynchronous reset, synchronous timing, positive edge trigger
Electrical specifications: 4.5 V to 5.5 V supply voltage range
Mounting: Surface mount technology
Package compatibility: 16-pin SOIC or SOP variants

The identified substitutes (CD74ACT161M and CD74ACT161M96) maintain these functional parameters while differing in manufacturer, product status, and certain performance specifications. Both parts share the same base product number (74ACT161) and logic family designation.

Parameter Comparison

Parameter	74ACT161SJX (onsemi)	CD74ACT161M (Harris)	CD74ACT161M96 (TI)
Logic Type	Binary Counter	Binary Counter	Binary Counter
Number of Bits per Element	4	4	4
Number of Elements	1	1	1
Direction	Up	Up	Up
Reset	Asynchronous	Asynchronous	Asynchronous
Timing	Synchronous	Synchronous	Synchronous
Trigger Type	Positive Edge	Positive Edge	Positive Edge
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
Count Rate	125 MHz	80 MHz	80 MHz
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Package / Case	16-SOIC (0.209", 5.30mm Width)	16-SOIC (0.154", 3.90mm Width)	16-SOIC (0.154", 3.90mm Width)
Product Status	Obsolete	Obsolete	Active
RoHS Status	REACH Unaffected	RoHS non-compliant	ROHS3 Compliant

Engineering Selection Recommendations

CD74ACT161M96 (Texas Instruments) is the preferred substitute for new designs and production applications. This part maintains active product status, ensuring long-term availability and supply chain stability. The CD74ACT161M96 is ROHS3 compliant, meeting current environmental and regulatory requirements. The extended operating temperature range (-55°C to 125°C) provides broader application flexibility compared to the original 74ACT161SJX.

CD74ACT161M (Harris Corporation) serves as an alternative substitute where legacy system compatibility or specific procurement constraints apply. This part is obsolete and RoHS non-compliant, limiting its suitability for new production. The extended temperature range matches the Texas Instruments variant.

Both substitutes operate within the specified 4.5 V to 5.5 V supply range and maintain functional equivalence as 4-bit binary counters. Package dimensions differ between the original part (0.209" width) and both substitutes (0.154" width), requiring PCB layout verification during implementation.

Frequently Asked Questions (FAQ)

Q: Can CD74ACT161M96 directly replace 74ACT161SJX in existing designs?

A: Functional replacement is supported. Both parts are 4-bit binary counters with identical logic characteristics. PCB layout modification may be required due to package width differences (0.209" versus 0.154").

Q: What is the significance of the count rate difference (125 MHz vs. 80 MHz)?

A: The 74ACT161SJX operates at 125 MHz maximum count rate, while both substitutes operate at 80 MHz. Applications requiring the higher count rate must verify that 80 MHz performance is acceptable for the intended circuit function.

Q: Why is CD74ACT161M96 preferred over CD74ACT161M?

A: CD74ACT161M96 maintains active product status and ROHS3 compliance, ensuring availability and regulatory alignment. CD74ACT161M is obsolete and RoHS non-compliant.

Q: Are there package compatibility concerns?

A: The original 74ACT161SJX uses a 16-SOIC package with 0.209" width. Both substitutes use 16-SOIC packages with 0.154" width. Pin pitch and functionality remain compatible, but PCB footprint adjustment is necessary.

Q: What operating temperature range should be specified for new applications?

A: Both substitutes support -55°C to 125°C, providing extended range compared to the original part's -40°C to 85°C specification. Design thermal requirements should determine the appropriate operating range.

Q: Is RoHS compliance a factor in substitute selection?

A: For applications subject to RoHS regulations, CD74ACT161M96 is the only compliant option. CD74ACT161M is RoHS non-compliant and unsuitable for regulated applications.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message