CD74AC161MG4 Equivalent & Substitute Parts

Part Overview

The CD74AC161MG4 is a 4-bit binary counter IC manufactured by Texas Instruments in a 16-SOIC surface mount package. This component is classified as a logic counter with synchronous timing, positive edge triggering, and asynchronous reset capability. The part is currently discontinued at DiGi Electronics, making equivalent substitute parts necessary for ongoing design support and procurement.

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

Substitute parts for the CD74AC161MG4 are qualified based on the following critical parameters that must remain constant:

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
Base Product Number: 74AC161 series

The substitute parts CD74AC161M, MC74AC161DG, and MC74AC161DR2G all meet these core functional and mechanical requirements. Variations in count rate, supply voltage range, and operating temperature are permitted within the 74AC161 logic family specification, as these represent performance enhancements or different operational ratings rather than functional incompatibilities.

Parameter Comparison

Parameter	CD74AC161MG4	CD74AC161M	MC74AC161DG	MC74AC161DR2G
Manufacturer	Texas Instruments	Texas Instruments	onsemi	onsemi
Logic Type	Binary Counter	Binary Counter	Binary Counter	Binary Counter
Number of Bits per Element	4	4	4	4
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	90 MHz	90 MHz	167 MHz	167 MHz
Voltage - Supply	1.5 V ~ 5.5 V	1.5 V ~ 5.5 V	2 V ~ 6 V	2 V ~ 6 V
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	16-SOIC (0.154", 3.90mm Width)	16-SOIC (0.154", 3.90mm Width)	16-SOIC (0.154", 3.90mm Width)	16-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

CD74AC161M (Texas Instruments) is the primary substitute for the discontinued CD74AC161MG4. Both parts are manufactured by Texas Instruments and maintain identical electrical specifications, including count rate, supply voltage range, and operating temperature. This part carries the same ROHS3 compliance and MSL rating, ensuring direct compatibility in existing designs.

MC74AC161DG and MC74AC161DR2G (onsemi) are qualified alternatives within the 74AC161 logic family. These parts offer enhanced count rate performance (167 MHz versus 90 MHz) and extended supply voltage range (2 V ~ 6 V). The onsemi variants carry Last Time Buy status, indicating limited future availability. Both onsemi parts maintain identical package geometry, pin configuration, and core functional characteristics required for substitution.

Selection between Texas Instruments and onsemi variants should be based on procurement availability, supply chain requirements, and design margin considerations. All substitute parts maintain ROHS3 compliance and MSL Level 1 rating.

Frequently Asked Questions (FAQ)

Q: Can MC74AC161DG or MC74AC161DR2G be used as direct replacements for CD74AC161MG4?

A: Yes. Both onsemi parts are functionally equivalent within the 74AC161 logic family. They share identical pin configuration, package geometry (16-SOIC), and core counter specifications (4-bit binary counter, asynchronous reset, synchronous timing, positive edge trigger). The higher count rate (167 MHz) and extended voltage range (2 V ~ 6 V) represent performance enhancements and do not affect compatibility.

Q: What is the difference between MC74AC161DG and MC74AC161DR2G?

A: Both parts are identical in electrical and functional specifications. The difference is packaging format: MC74AC161DG is supplied in Tube packaging, while MC74AC161DR2G is supplied in Cut Tape (CT) & Digi-Reel format. Selection depends on procurement and assembly requirements.

Q: Are there any temperature or voltage considerations when substituting with onsemi parts?

A: The onsemi variants (MC74AC161DG and MC74AC161DR2G) operate over -40°C ~ 85°C, which is narrower than the Texas Instruments range of -55°C ~ 125°C. If your design requires operation below -40°C or above 85°C, CD74AC161M is the appropriate choice. For standard industrial temperature ranges, onsemi parts are suitable.

Q: Is the 16-SOIC package identical across all substitute parts?

A: Yes. All substitute parts use the 16-SOIC (0.154", 3.90mm Width) package with identical pin configuration and PCB footprint. No layout modifications are required when substituting between these parts.

Q: Do all substitute parts meet RoHS compliance?

A: Yes. CD74AC161M, MC74AC161DG, and MC74AC161DR2G are all ROHS3 compliant with MSL Level 1 (Unlimited) moisture sensitivity rating, matching the original CD74AC161MG4 specifications.

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