CD74AC161M96 Equivalent & Substitute Parts

Part Overview

The CD74AC161M96 is a 4-bit binary counter IC manufactured by Texas Instruments in the 74AC logic series. 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. Substitute parts must maintain functional equivalence in counter operation, pin configuration, and electrical performance within specified operating ranges.

Key Parameters

Parameter	Value
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)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the CD74AC161M96 is determined by the following critical parameters:

Logic Function: All substitute parts must be 4-bit binary counters with identical up-counting functionality
Pin Configuration: All parts must use the 16-SOIC package with matching pinout
Trigger Mechanism: Positive edge triggering is required for all substitutes
Reset Capability: Asynchronous reset functionality must be present
Synchronous Operation: Counter must operate synchronously

The substitute parts are grouped into two logic families: the 74AC series (higher performance) and the 74HC series (lower performance). Both families maintain functional compatibility with the original CD74AC161M96 through identical counter architecture and pin assignments.

Parameter Comparison

Parameter	CD74AC161M96	SN74HC161DR	MC74AC161DG	MC74AC161DR2G
Manufacturer	Texas Instruments	Texas Instruments	onsemi	onsemi
Series	74AC	74HC	74AC	74AC
Logic Type	Binary Counter	Binary Counter	Binary Counter	Binary Counter
Number of Bits	4	4	4	4
Direction	Up	Up	Up	Up
Reset	Asynchronous	Asynchronous	Asynchronous	Asynchronous
Timing	Synchronous	Synchronous	Synchronous	Synchronous
Trigger Type	Positive Edge	Positive Edge	Positive Edge	Positive Edge
Count Rate	90 MHz	36 MHz	167 MHz	167 MHz
Voltage - Supply	1.5 V ~ 5.5 V	2 V ~ 6 V	2 V ~ 6 V	2 V ~ 6 V
Operating Temperature	-55°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	16-SOIC	16-SOIC	16-SOIC	16-SOIC
Product Status	Obsolete	Active	Last Time Buy	Last Time Buy
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

SN74HC161DR (Texas Instruments, Active Status): This part is the primary recommended substitute due to its active product status and continued availability. It maintains full functional compatibility with the CD74AC161M96 through identical counter architecture and 16-SOIC packaging. The reduced count rate of 36 MHz is suitable for applications not requiring the higher performance of the 74AC series. This part is ROHS3 compliant and carries unlimited moisture sensitivity rating.

MC74AC161DG (onsemi, Last Time Buy): This substitute maintains the 74AC series performance characteristics with a count rate of 167 MHz, exceeding the original part's 90 MHz specification. It is classified as Last Time Buy, indicating limited future availability. ROHS3 compliance and unlimited moisture sensitivity rating are maintained. Tube packaging is provided.

MC74AC161DR2G (onsemi, Last Time Buy): This substitute offers the highest count rate at 167 MHz within the 74AC series. It is also classified as Last Time Buy with limited future availability. Cut Tape and Digi-Reel packaging options are available. ROHS3 compliance and unlimited moisture sensitivity rating are maintained. This part provides the largest current inventory at 10,035 pieces.

All substitute parts are ROHS3 compliant and REACH unaffected, meeting regulatory requirements for the CD74AC161M96 application space.

Frequently Asked Questions (FAQ)

Q: Can the SN74HC161DR be used as a direct replacement for the CD74AC161M96?

A: Yes. Both parts are 4-bit binary counters in 16-SOIC packaging with identical pin configurations, asynchronous reset, synchronous timing, and positive edge triggering. The SN74HC161DR operates at a lower count rate (36 MHz versus 90 MHz) and has a narrower supply voltage range (2 V ~ 6 V versus 1.5 V ~ 5.5 V) and operating temperature range (-40°C ~ 85°C versus -55°C ~ 125°C). Verify these specifications are acceptable for your application.

Q: What is the difference between the 74AC and 74HC logic families?

A: The 74AC series (CD74AC161M96, MC74AC161DG, MC74AC161DR2G) operates at higher count rates (90 MHz to 167 MHz) compared to the 74HC series (SN74HC161DR at 36 MHz). Both families provide identical counter functionality and pin compatibility. The 74AC family is suitable for higher-speed applications, while the 74HC family is appropriate for lower-speed designs.

Q: Are all substitute parts available in the same packaging?

A: All substitute parts use the 16-SOIC package. Packaging options differ: the CD74AC161M96 is supplied in Digi-Reel, SN74HC161DR in Cut Tape and Digi-Reel, MC74AC161DG in Tube, and MC74AC161DR2G in Cut Tape and Digi-Reel.

Q: What is the product status significance of these parts?

A: The CD74AC161M96 is obsolete, making substitutes necessary. The SN74HC161DR is active with ongoing production and availability. The MC74AC161DG and MC74AC161DR2G are Last Time Buy, indicating limited future availability and eventual discontinuation.

Q: Do all parts meet the same compliance standards?

A: Yes. All parts are ROHS3 compliant, REACH unaffected, and carry Moisture Sensitivity Level 1 (Unlimited). All parts are classified under ECCN EAR99 and HTSUS 8542.39.0001.

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