74AC299SC Equivalent & Substitute Parts

Part Overview

The 74AC299SC is an 8-bit universal shift register manufactured by onsemi, housed in a 20-SOIC surface mount package. This component functions as a shift/storage register with tri-state output capability, supporting supply voltages from 2V to 6V and operating across the industrial temperature range of -40°C to 85°C. The part is currently classified as obsolete, making identification of functionally equivalent alternatives essential for design continuity and procurement planning.

Substiute Parts

74AC299SC

onsemiIn Stock: 242374AC299SC Datasheet

Current PartRFQ

CD74AC299M96

Texas InstrumentsIn Stock: 2185CD74AC299M96 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 74AC299SC is determined by strict equivalence across the following critical parameters:

• Logic type and function (universal shift register with 8-bit capacity)
• Output configuration (tri-state capability)
• Physical package (20-SOIC form factor)
• Electrical interface (pin-compatible pinout)
• Mounting technology (surface mount)

The CD74AC299M96 manufactured by Texas Instruments meets these core substitution criteria. Both parts share the same base product number (74AC299), identical bit width and element count, matching package geometry, and compatible tri-state output architecture. Substitution is valid where the operating environment and supply voltage requirements of the application fall within the overlapping specification ranges of both components.

Parameter Comparison

Engineering Selection Recommendations

The CD74AC299M96 serves as a direct functional substitute for the 74AC299SC. The Texas Instruments component maintains full pin and functional compatibility while offering extended operating temperature range (-55°C to 125°C versus -40°C to 85°C) and broader supply voltage tolerance (1.5V to 5.5V versus 2V to 6V). The substitute part carries active product status and ROHS3 compliance, providing supply chain continuity and regulatory alignment for new designs or production transitions.

Selection of the CD74AC299M96 is appropriate for applications where the original 74AC299SC supply has been exhausted. The overlapping voltage specification range (2V to 5.5V) ensures electrical compatibility within standard operating conditions. Both components share identical MSL ratings and REACH compliance status, eliminating moisture sensitivity or environmental regulatory concerns during substitution.

Frequently Asked Questions (FAQ)

Q: Can the CD74AC299M96 directly replace the 74AC299SC in existing designs?

A: Yes. Both components are pin-compatible 8-bit universal shift registers in 20-SOIC packages with tri-state outputs. The CD74AC299M96 maintains functional equivalence across all specified parameters within the overlapping supply voltage range of 2V to 5.5V.

Q: What are the voltage compatibility limits for substitution?

A: The 74AC299SC operates from 2V to 6V, while the CD74AC299M96 operates from 1.5V to 5.5V. Substitution is valid for applications operating between 2V and 5.5V. Applications requiring operation above 5.5V must retain the original 74AC299SC or identify alternative components with higher voltage ratings.

Q: Does the extended temperature range of the CD74AC299M96 affect substitution decisions?

A: No. The CD74AC299M96 temperature range (-55°C to 125°C) encompasses the original part's range (-40°C to 85°C). Applications operating within the original temperature specification remain fully compatible with the substitute component.

Q: Are there packaging or moisture sensitivity differences between these parts?

A: No. Both components use identical 20-SOIC packaging and carry MSL Level 1 (Unlimited) ratings. Handling, storage, and assembly processes remain unchanged during substitution.

Q: Why is the 74AC299SC classified as obsolete?

A: Obsolescence reflects the manufacturer's discontinuation of the part. The CD74AC299M96 provides functional continuity for applications requiring 8-bit universal shift register functionality in 20-SOIC packages.