74ACT299SCX Equivalent & Substitute Parts

Part Overview

The 74ACT299SCX is an 8-bit universal shift register with tri-state output, manufactured by onsemi in a 20-SOIC surface mount package. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing production and maintenance applications. The 74ACT299 series provides parallel and serial data shifting capabilities with configurable input/output control, commonly used in data manipulation and storage circuits requiring high-speed logic operations.

Substiute Parts

74ACT299SCX

onsemiIn Stock: 197474ACT299SCX Datasheet

Current PartRFQ

CD74ACT299M

Harris CorporationIn Stock: 1794CD74ACT299M Datasheet

SimilarRFQ

CD74ACT299M96

Texas InstrumentsIn Stock: 1246CD74ACT299M96 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 74ACT299SCX is determined by strict alignment of the following parameters:

• Logic Type & Function: Must be shift register with universal function capability
• Bit Configuration: Must maintain 1 element with 8 bits per element
• Output Architecture: Must feature tri-state output
• Supply Voltage: Must operate within 4.5V ~ 5.5V range
• Package Specification: Must use 20-SOIC (0.295", 7.50mm Width) surface mount package
• Base Product Number: Must belong to 74ACT299 series

Both identified substitute parts meet these core substitution criteria. Differences in operating temperature range, product status, and compliance certifications do not affect functional interchangeability within the specified electrical and mechanical parameters.

Parameter Comparison

Engineering Selection Recommendations

CD74ACT299M96 (Texas Instruments) is the preferred substitute for new designs and production applications. This part maintains active product status, ensuring long-term availability and manufacturer support. It carries ROHS3 compliance certification, meeting modern environmental and regulatory requirements. The extended operating temperature range (-55°C ~ 125°C) provides thermal margin beyond the original 74ACT299SCX specification.

CD74ACT299M (Harris Corporation) serves as an alternative substitute where inventory constraints or legacy system requirements necessitate its use. This part is classified as obsolete with RoHS non-compliant status, limiting its suitability for new production environments subject to environmental regulations.

Both substitutes maintain identical electrical and mechanical specifications to the 74ACT299SCX, ensuring direct functional replacement without circuit redesign.

Frequently Asked Questions (FAQ)

Q: Can CD74ACT299M96 directly replace 74ACT299SCX in existing circuits? A: Yes. Both parts share identical logic function, bit configuration, tri-state output architecture, supply voltage range, and 20-SOIC package specification. No circuit modifications are required.

Q: What is the significance of the extended operating temperature range in CD74ACT299M96? A: The CD74ACT299M96 operates from -55°C to 125°C, compared to the 74ACT299SCX range of -40°C to 85°C. This extended range provides additional thermal margin for applications operating in extreme environments, though both parts function identically within the 74ACT299SCX temperature specification.

Q: Why is CD74ACT299M96 preferred over CD74ACT299M? A: CD74ACT299M96 maintains active product status and ROHS3 compliance, ensuring continued manufacturer support and regulatory alignment. CD74ACT299M is obsolete and RoHS non-compliant, presenting supply chain and compliance risks for new production.

Q: Are packaging differences between substitutes significant? A: No. All three parts use identical 20-SOIC (0.295", 7.50mm Width) surface mount packages. Packaging differences (Tube vs. Tape & Reel) relate only to order quantity and handling, not electrical or mechanical compatibility.

Q: Can these substitutes be used interchangeably in the same PCB assembly? A: Yes. All substitutes are pin-compatible and functionally equivalent within the specified electrical parameters. PCB layouts and assembly processes require no modification.