CD74AC163M Equivalent & Substitute Parts

Part Overview

The CD74AC163M is a 4-bit binary counter IC manufactured by Texas Instruments, housed in a 16-SOIC surface mount package. This synchronous counter operates at a maximum count rate of 90 MHz with positive edge triggering and supports supply voltages from 1.5 V to 5.5 V across an operating temperature range of -55°C to 125°C. The part is designated as Last Time Buy status, indicating discontinued production. Equivalent and substitute parts are necessary to maintain design continuity and ensure long-term component availability for new production runs and field replacements.

Key Parameters

Parameter	Value
Logic Type	Binary Counter
Number of Bits per Element	4
Direction	Up
Reset	Synchronous
Timing	Synchronous
Trigger Type	Positive Edge
Count Rate	90 MHz
Voltage - Supply	1.5 V ~ 5.5 V
Operating Temperature	-55°C ~ 125°C
Package / Case	16-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the CD74AC163M is determined by strict equivalence across the following critical parameters:

Logic Type: Binary Counter (4-bit, up-counting)
Reset and Timing: Synchronous operation with positive edge triggering
Package: 16-SOIC surface mount form factor
Base Product Number: 74AC163 series designation
Compliance: ROHS3 and REACH status alignment

The CD74AC163M96 (Texas Instruments, Tape & Reel packaging) and MC74AC163DR2G (onsemi, Tape & Reel packaging) both satisfy these core substitution criteria. Packaging format differences (Tube versus Tape & Reel) do not affect functional equivalence but may impact procurement and handling requirements.

Parameter Comparison

Parameter	CD74AC163M	CD74AC163M96	MC74AC163DR2G
Manufacturer	Texas Instruments	Texas Instruments	onsemi
Logic Type	Binary Counter	Binary Counter	Binary Counter
Number of Bits per Element	4	4	4
Direction	Up	Up	Up
Reset	Synchronous	Synchronous	Synchronous
Timing	Synchronous	Synchronous	Synchronous
Trigger Type	Positive Edge	Positive Edge	Positive Edge
Count Rate	90 MHz	90 MHz	140 MHz
Voltage - Supply	1.5 V ~ 5.5 V	1.5 V ~ 5.5 V	2 V ~ 6 V
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°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)
Mounting Type	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Last Time Buy	Active	Active

Engineering Selection Recommendations

The CD74AC163M96 is the primary substitute, maintaining identical electrical specifications and operating ranges while offering Active product status and improved availability. This part is recommended for designs requiring direct functional replacement with no circuit modifications.

The MC74AC163DR2G from onsemi provides an alternative substitute with enhanced performance characteristics: higher count rate (140 MHz versus 90 MHz) and extended upper supply voltage limit (6 V versus 5.5 V). However, this part operates at a reduced lower temperature limit (-40°C versus -55°C) and minimum supply voltage (2 V versus 1.5 V). Selection of the MC74AC163DR2G requires verification that the design does not depend on the full -55°C lower temperature specification or 1.5 V minimum supply voltage operation.

Both substitute parts carry ROHS3 compliance and REACH Unaffected status, ensuring regulatory alignment with the original CD74AC163M.

Frequently Asked Questions (FAQ)

Q: Can the CD74AC163M96 be used as a direct replacement for CD74AC163M?

A: Yes. The CD74AC163M96 is functionally equivalent across all electrical and timing parameters. The difference is packaging format: CD74AC163M is supplied in Tube, while CD74AC163M96 is supplied in Tape & Reel. Both use the 16-SOIC package and are suitable for surface mount assembly.

Q: What are the key differences between CD74AC163M96 and MC74AC163DR2G?

A: Both are 4-bit binary counters in 16-SOIC packages. The MC74AC163DR2G offers higher count rate (140 MHz) and upper supply voltage (6 V). However, it has a higher minimum supply voltage (2 V) and lower minimum operating temperature (-40°C). Verify your design does not require operation below -40°C or at supply voltages below 2 V before selecting the onsemi part.

Q: Why is the CD74AC163M marked as Last Time Buy?

A: Last Time Buy status indicates Texas Instruments has discontinued production. The CD74AC163M96 and MC74AC163DR2G are active alternatives to ensure continued component availability.

Q: Are all three parts ROHS3 compliant?

A: Yes. CD74AC163M, CD74AC163M96, and MC74AC163DR2G are all ROHS3 Compliant and REACH Unaffected.

Q: Can I use these parts interchangeably in my PCB design?

A: Yes, provided your circuit operates within the overlapping parameter ranges. All three parts share the same 16-SOIC package footprint and pinout. Verify that your design does not depend on specifications unique to the CD74AC163M (such as -55°C minimum temperature or 1.5 V minimum supply voltage) if selecting the MC74AC163DR2G.

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