74ACT161SC Binary Counter IC Equivalent & Substitute Parts

Part Overview

The 74ACT161SC is a 4-bit binary counter IC manufactured by onsemi, housed in a 16-SOIC surface mount package. This component functions as a synchronous up counter with asynchronous reset, operating at a maximum count rate of 125 MHz. The part is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and production continuity.

Key Parameters

Parameter	Specification
Logic Type	Binary Counter
Number of Bits	4 Bit
Direction	Up
Reset Type	Asynchronous
Timing	Synchronous
Count Rate	125 MHz
Trigger Type	Positive Edge
Voltage Supply	4.5 V ~ 5.5 V
Operating Temperature	-40°C ~ 85°C
Package Type	16-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Base Product Number	74ACT161

Substitute Part Grouping Explanation

Substitution of the 74ACT161SC is determined by strict equivalence across the following critical parameters:

Logic Architecture: Binary counter with 4-bit capacity, up-counting direction, positive edge triggering
Electrical Performance: Synchronous timing with asynchronous reset capability, 4.5 V to 5.5 V supply voltage range
Package Compatibility: 16-SOIC surface mount package with identical pin configuration and mechanical dimensions
Functional Specifications: Count rate capability, operating temperature range, and reset behavior

Substitute parts are grouped into two categories based on parametric alignment:

Direct Substitutes (MC74ACT161DR2G): Identical electrical specifications and package, manufactured by onsemi with Last Time Buy status.

Parametric Equivalents (MC74ACT161DG): Identical electrical specifications and package, manufactured by onsemi with Last Time Buy status.

Similar Alternatives (CD74ACT161M, CD74ACT161M96): Functionally equivalent across core counter specifications and package, with variations in count rate (80 MHz vs. 125 MHz), operating temperature range, and manufacturer status.

Parameter Comparison

Parameter	74ACT161SC (onsemi)	MC74ACT161DR2G (onsemi)	MC74ACT161DG (onsemi)	CD74ACT161M (Harris)	CD74ACT161M96 (TI)
Logic Type	Binary Counter	Binary Counter	Binary Counter	Binary Counter	Binary Counter
Number of Bits	4 Bit	4 Bit	4 Bit	4 Bit	4 Bit
Direction	Up	Up	Up	Up	Up
Reset Type	Asynchronous	Asynchronous	Asynchronous	Asynchronous	Asynchronous
Timing	Synchronous	Synchronous	Synchronous	Synchronous	Synchronous
Count Rate	125 MHz	125 MHz	125 MHz	80 MHz	80 MHz
Trigger Type	Positive Edge	Positive Edge	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	4.5 V ~ 5.5 V	4.5 V ~ 5.5 V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-55°C ~ 125°C	-55°C ~ 125°C
Package Type	16-SOIC	16-SOIC	16-SOIC	16-SOIC	16-SOIC
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Last Time Buy	Last Time Buy	Obsolete	Active
RoHS Compliance	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant	ROHS3 Compliant

Engineering Selection Recommendations

MC74ACT161DR2G and MC74ACT161DG are the primary substitutes for 74ACT161SC. Both are manufactured by onsemi with identical electrical specifications and package configuration. MC74ACT161DR2G is supplied in Cut Tape packaging with 2900 units in stock, while MC74ACT161DG is supplied in Tube packaging with 1860 units in stock. Both carry Last Time Buy status and ROHS3 compliance certification.

CD74ACT161M96 (Texas Instruments) is an active product alternative with ROHS3 compliance. This part operates at 80 MHz count rate versus the 125 MHz specification of the original part, and supports an extended operating temperature range of -55°C to 125°C. It is supplied in Tape & Reel packaging with 4001 units in stock.

CD74ACT161M (Harris Corporation) is an obsolete product with RoHS non-compliance status. This part operates at 80 MHz count rate and supports an extended operating temperature range of -55°C to 125°C. It is supplied in Tube packaging with 5809 units in stock.

For new designs or production requiring active product status and compliance certifications, CD74ACT161M96 is the recommended selection. For existing designs requiring direct specification match, MC74ACT161DR2G or MC74ACT161DG provide optimal compatibility.

Frequently Asked Questions (FAQ)

Q: Can MC74ACT161DR2G replace 74ACT161SC directly? A: Yes. MC74ACT161DR2G is electrically and mechanically identical to 74ACT161SC. Both operate at 125 MHz count rate, support 4.5 V to 5.5 V supply voltage, and use the 16-SOIC package. Pin configuration and functional behavior are equivalent.

Q: What is the difference between MC74ACT161DR2G and MC74ACT161DG? A: Both parts are electrically identical with matching specifications. The primary difference is packaging format: MC74ACT161DR2G is supplied in Cut Tape, while MC74ACT161DG is supplied in Tube. Selection depends on assembly process requirements.

Q: Can CD74ACT161M96 be used as a substitute? A: CD74ACT161M96 is functionally compatible but operates at 80 MHz count rate compared to the 125 MHz specification of 74ACT161SC. It supports an extended operating temperature range of -55°C to 125°C and carries active product status with ROHS3 compliance. Use this part only if the 80 MHz count rate meets application requirements.

Q: Why is 74ACT161SC listed as obsolete? A: The 74ACT161SC has reached end-of-life status. MC74ACT161DR2G and MC74ACT161DG are available as Last Time Buy alternatives from the same manufacturer, ensuring design continuity.

Q: Are all substitute parts RoHS compliant? A: MC74ACT161DR2G, MC74ACT161DG, and CD74ACT161M96 are ROHS3 compliant. CD74ACT161M is RoHS non-compliant and should not be used in applications requiring RoHS certification.

Q: What packaging options are available for substitutes? A: MC74ACT161DR2G is available in Cut Tape packaging. MC74ACT161DG is available in Tube packaging. CD74ACT161M96 is available in Tape & Reel packaging. CD74ACT161M is available in Tube packaging. Selection depends on assembly equipment compatibility and volume requirements.

Q: Do all parts use the same 16-SOIC package? A: Yes. All substitute parts use the 16-SOIC (0.154", 3.90mm Width) surface mount package with identical pin configuration and mechanical dimensions, ensuring PCB layout compatibility.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message