74ACT163SCX Binary Counter Equivalent & Substitute Parts

Part Overview

The 74ACT163SCX is a 4-bit binary counter IC manufactured by onsemi, designed for synchronous counting applications with a maximum count rate of 140 MHz. This component features positive edge triggering, synchronous reset, and operates across a supply voltage range of 4.5 V to 5.5 V with an operating temperature range of -40°C to 85°C. The part is housed in a 16-SOIC surface mount package.

The 74ACT163SCX is currently classified as obsolete. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support ongoing production or maintenance of systems utilizing this component.

Substiute Parts

74ACT163SCX

onsemiIn Stock: 1517574ACT163SCX Datasheet

Current PartRFQ

MC74ACT163DR2G

onsemiIn Stock: 8584MC74ACT163DR2G Datasheet

DirectRFQ

CD74ACT163M

Harris CorporationIn Stock: 3776CD74ACT163M Datasheet

SimilarRFQ

CD74ACT163M96

Texas InstrumentsIn Stock: 7734CD74ACT163M96 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 74ACT163SCX are identified based on strict electrical and mechanical compatibility criteria. All substitute candidates must satisfy the following requirements:

• Logic Function: Binary counter with 4-bit capacity, 1 element configuration
• Counting Direction: Up counting only
• Reset Mechanism: Synchronous reset
• Timing Architecture: Synchronous operation
• Trigger Mechanism: Positive edge triggering
• Package Compatibility: 16-SOIC surface mount package with identical physical dimensions
• Electrical Interface: Supply voltage range 4.5 V to 5.5 V
• Pin Configuration: Identical pinout as 74ACT163 base product number

Substitutes are grouped into two categories: direct manufacturer equivalents (identical electrical performance) and similar alternatives (compatible but with parameter variations within acceptable operational limits).

Parameter Comparison

Engineering Selection Recommendations

MC74ACT163DR2G is the primary direct substitute for the 74ACT163SCX. Both parts are manufactured by onsemi and share identical electrical specifications, including the 140 MHz count rate and -40°C to 85°C operating temperature range. The MC74ACT163DR2G is currently in active production status, ensuring long-term availability. This part is ROHS3 compliant and supplied in Tape & Reel packaging format, suitable for automated assembly processes.

CD74ACT163M96 (Texas Instruments) and CD74ACT163M (Harris Corporation) are compatible alternatives that maintain functional equivalence within the 74ACT logic family. Both operate at 80 MHz count rate and support an extended operating temperature range of -55°C to 125°C. The CD74ACT163M96 is currently active and ROHS3 compliant, making it suitable for new designs requiring extended temperature performance. The CD74ACT163M is obsolete and RoHS non-compliant, limiting its application to legacy system maintenance only.

Selection criteria should prioritize product status (active vs. obsolete), compliance certifications (ROHS3), and operational requirements. For applications requiring the full 140 MHz performance specification of the original 74ACT163SCX, the MC74ACT163DR2G is the recommended choice. For applications tolerating 80 MHz operation with extended temperature range, CD74ACT163M96 provides an active, compliant alternative.

Frequently Asked Questions (FAQ)

Q: Can MC74ACT163DR2G directly replace 74ACT163SCX without circuit modification?

A: Yes. Both parts share identical pinout, electrical specifications, and functional behavior. No circuit modifications are required for direct substitution.

Q: What is the primary difference between MC74ACT163DR2G and CD74ACT163M96?

A: The primary differences are manufacturer (onsemi vs. Texas Instruments) and count rate specification (140 MHz vs. 80 MHz). Both maintain identical logic function, package, and supply voltage requirements. The MC74ACT163DR2G preserves the original 140 MHz performance specification.

Q: Are CD74ACT163M and CD74ACT163M96 interchangeable?

A: Both parts are functionally equivalent in logic operation and package configuration. However, CD74ACT163M is obsolete and RoHS non-compliant, while CD74ACT163M96 is active and ROHS3 compliant. For new applications, CD74ACT163M96 is the preferred choice.

Q: Does operating temperature range affect substitution compatibility?

A: Operating temperature range does not prevent substitution if the application operates within the overlapping temperature window. The 74ACT163SCX operates -40°C to 85°C, while CD74ACT163M and CD74ACT163M96 operate -55°C to 125°C. Applications within -40°C to 85°C can use any substitute. Applications requiring -55°C operation must use CD74ACT163M or CD74ACT163M96.

Q: What packaging format should be selected for automated assembly?

A: Tape & Reel (TR) packaging is standard for automated pick-and-place assembly. MC74ACT163DR2G and CD74ACT163M96 are supplied in Tape & Reel format. Tube packaging (74ACT163SCX and CD74ACT163M) is suitable for manual assembly or lower-volume applications.

Q: Is the 80 MHz count rate of CD74ACT163M96 sufficient for applications designed for 140 MHz?

A: No. Applications requiring 140 MHz operation must use MC74ACT163DR2G to maintain the original performance specification. CD74ACT163M96 is suitable only for applications with maximum count rate requirements of 80 MHz or lower.