74ACT299SC Equivalent & Substitute Parts

Part Overview

The 74ACT299SC is an 8-bit universal shift register manufactured by onsemi, housed in a 20-SOIC surface mount package. This component functions as a storage and shift register with tri-state output capability, designed for logic-level applications requiring 4.5V to 5.5V supply voltage operation. The part is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations.

Substiute Parts

74ACT299SC

onsemiIn Stock: 81874ACT299SC 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 74ACT299SC is determined by strict alignment across 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 share 74ACT299 base designation

The identified substitute parts CD74ACT299M and CD74ACT299M96 meet all core electrical and mechanical substitution criteria. Variations in operating temperature range, product status, and compliance certifications are secondary considerations that do not affect functional interchangeability within the specified parameter set.

Parameter Comparison

Engineering Selection Recommendations

CD74ACT299M96 (Texas Instruments) is the preferred substitute option. This part maintains full electrical and mechanical compatibility with the 74ACT299SC while offering active product status and ROHS3 compliance certification. The extended operating temperature range (-55°C ~ 125°C) provides additional thermal margin beyond the original specification. Tape & Reel packaging supports automated assembly processes.

CD74ACT299M (Harris Corporation) provides functional equivalence with identical electrical specifications and package configuration. This part carries obsolete product status classification and RoHS non-compliant certification. Selection of this substitute should be limited to legacy system maintenance where supply chain continuity is the primary consideration.

Frequently Asked Questions (FAQ)

Q: Can CD74ACT299M96 be used as a direct replacement for 74ACT299SC in new designs?

A: Yes. Both parts share identical logic type, bit configuration, output architecture, supply voltage range, and 20-SOIC package specification. The CD74ACT299M96 offers the additional advantage of active product status and RoHS3 compliance, making it suitable for new design implementations.

Q: What is the significance of the extended operating temperature range in CD74ACT299M96?

A: The CD74ACT299M96 operates across -55°C ~ 125°C, compared to the 74ACT299SC range of -40°C ~ 85°C. This extended range does not affect substitution eligibility but provides additional thermal operating margin for applications requiring broader temperature performance.

Q: Are there package differences between the substitute parts?

A: All three parts use identical 20-SOIC (0.295", 7.50mm Width) surface mount packaging. Packaging format differences exist only in supplier delivery method: 74ACT299SC uses standard packaging, CD74ACT299M uses Tube packaging, and CD74ACT299M96 uses Tape & Reel (TR) packaging. These differences do not affect component functionality or PCB mounting compatibility.

Q: Why is CD74ACT299M96 preferred over CD74ACT299M?

A: CD74ACT299M96 maintains active product status, ensuring continued availability and manufacturing support. It also carries ROHS3 compliance certification, meeting current environmental and regulatory standards. CD74ACT299M is classified as obsolete with RoHS non-compliant status, limiting its suitability for new applications.

Q: Can these parts be used interchangeably in existing 74ACT299SC applications?

A: Yes. All substitute parts meet the core electrical and mechanical parameters that define functional compatibility: 8-bit universal shift register configuration, tri-state output, 4.5V ~ 5.5V supply voltage, and 20-SOIC package specification. No circuit modifications are required for substitution.