74AC163SCX Binary Counter Equivalent & Substitute Parts

Part Overview

The 74AC163SCX is a 4-bit binary counter IC manufactured by onsemi, housed in a 16-SOIC surface mount package. This component functions as a synchronous, positive edge-triggered counter with a maximum count rate of 140 MHz and operates across a supply voltage range of 2 V to 6 V. The part is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and production continuity.

Substiute Parts

74AC163SCX

onsemiIn Stock: 2015274AC163SCX Datasheet

Current PartRFQ

MC74AC163DR2G

onsemiIn Stock: 3811MC74AC163DR2G Datasheet

DirectRFQ

CD74AC163M

Harris CorporationIn Stock: 4903CD74AC163M Datasheet

SimilarRFQ

CD74AC163M96

Texas InstrumentsIn Stock: 5878CD74AC163M96 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 74AC163SCX is determined by strict equivalence across the following critical parameters: logic type (binary counter), bit width (4-bit), count direction (up), reset mechanism (synchronous), timing architecture (synchronous), trigger polarity (positive edge), package form factor (16-SOIC), and mounting technology (surface mount).

The substitute parts identified—MC74AC163DR2G, CD74AC163M, and CD74AC163M96—all satisfy these core functional and mechanical requirements. However, variations exist in count rate specifications, supply voltage ranges, operating temperature ranges, product status, and regulatory compliance certifications. These variations must be evaluated against application requirements before selection.

Parameter Comparison

Engineering Selection Recommendations

For applications requiring direct functional replacement with identical electrical performance, MC74AC163DR2G (onsemi) is the primary substitute. This part maintains the 140 MHz count rate and 2 V to 6 V supply voltage range of the original 74AC163SCX while offering active product status and ROHS3 compliance. Both parts are manufactured by onsemi and share identical timing specifications.

CD74AC163M96 (Texas Instruments) provides an alternative with active product status and ROHS3 compliance. This part operates at 90 MHz count rate with an extended supply voltage range of 1.5 V to 5.5 V and extended operating temperature range of -55°C to 125°C. Selection of this part is appropriate when the reduced count rate is acceptable and extended environmental operating conditions are required.

CD74AC163M (Harris Corporation) is functionally equivalent but carries obsolete product status and RoHS non-compliance, making it unsuitable for new designs or applications with regulatory compliance requirements.

Frequently Asked Questions (FAQ)

Q: Can MC74AC163DR2G directly replace 74AC163SCX without circuit modification?

A: Yes. Both parts share identical count rate (140 MHz), supply voltage range (2 V to 6 V), operating temperature range (-40°C to 85°C), and 16-SOIC package specifications. No circuit modification is required.

Q: What is the primary difference between MC74AC163DR2G and CD74AC163M96?

A: The primary differences are manufacturer (onsemi vs. Texas Instruments), count rate (140 MHz vs. 90 MHz), supply voltage range (2 V–6 V vs. 1.5 V–5.5 V), and operating temperature range (-40°C to 85°C vs. -55°C to 125°C). Both are active products with ROHS3 compliance.

Q: Is CD74AC163M suitable for new production designs?

A: No. CD74AC163M carries obsolete product status and RoHS non-compliance. It is not recommended for new designs or applications subject to regulatory compliance requirements.

Q: Does the 90 MHz count rate of CD74AC163M96 affect circuit compatibility?

A: The 90 MHz count rate is lower than the original 74AC163SCX specification (140 MHz). Selection of CD74AC163M96 is appropriate only when application timing requirements do not exceed 90 MHz operation.

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

A: Yes. All substitute parts are housed in 16-SOIC surface mount packages with identical mechanical dimensions (0.154", 3.90mm width), ensuring PCB layout compatibility.

Q: What is the difference between Tape & Reel and Tube packaging?

A: Tape & Reel (TR) packaging is standard for automated assembly processes and high-volume production. Tube packaging is used for lower-volume applications and manual assembly. Both formats contain identical die and electrical specifications.