74AC299SJ Equivalent & Substitute Parts

Part Overview

The 74AC299SJ is an 8-bit universal shift register with tri-state output, manufactured by onsemi in a 20-SOP surface mount package. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and production continuity. The 74AC299 series provides shift register functionality suitable for data manipulation and storage applications requiring universal shift/store capability.

Substiute Parts

74AC299SJ

onsemiIn Stock: 100674AC299SJ Datasheet

Current PartRFQ

CD74AC299M96

Texas InstrumentsIn Stock: 2185CD74AC299M96 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 74AC299SJ is based on the following critical parameters that must remain consistent:

• Logic type and function (Universal Shift Register, 8-bit, 1 element)
• Output configuration (Tri-State)
• Package compatibility (20-pin SOIC/SOP form factor)
• Supply voltage range overlap
• Operating temperature range coverage
• Surface mount capability
• Moisture sensitivity classification

The CD74AC299M96 from Texas Instruments qualifies as a direct substitute because it maintains identical logic specifications, tri-state output architecture, and 20-SOIC package footprint. Both parts belong to the 74AC series and provide equivalent functional performance for shift register applications.

Parameter Comparison

Engineering Selection Recommendations

The CD74AC299M96 is the qualified substitute for the obsolete 74AC299SJ. Selection is based on:

• Functional equivalence: Both parts implement identical 8-bit universal shift register logic with tri-state outputs
• Active product status: The CD74AC299M96 is currently in active production, ensuring supply chain continuity
• Regulatory compliance: The Texas Instruments part meets ROHS3 requirements, supporting modern manufacturing and environmental standards
• Extended operating range: The CD74AC299M96 provides wider temperature range (-55°C to 125°C) and lower minimum supply voltage (1.5V), offering greater design flexibility
• Package compatibility: Both use 20-pin SOIC/SOP form factors suitable for surface mount assembly

Physical package dimensions differ slightly (5.30mm vs 7.50mm width), requiring PCB layout verification during design transition.

Frequently Asked Questions (FAQ)

Q: Can the CD74AC299M96 directly replace the 74AC299SJ without circuit modification?

A: The CD74AC299M96 provides functional equivalence for shift register operations. However, verify PCB footprint compatibility, as the package width differs (5.30mm vs 7.50mm). Pin configuration and electrical characteristics are compatible within the specified voltage and temperature ranges.

Q: What is the significance of the voltage supply range difference?

A: The 74AC299SJ operates from 2V to 6V, while the CD74AC299M96 operates from 1.5V to 5.5V. The substitute part has a lower minimum voltage but a lower maximum voltage. Designs operating above 5.5V require the original 74AC299SJ specification or alternative parts rated for higher voltages.

Q: Why is the 74AC299SJ classified as obsolete?

A: Obsolete status indicates the manufacturer (onsemi) has discontinued production. The CD74AC299M96 from Texas Instruments remains in active production, providing a viable path for design continuity and new production builds.

Q: Are there package considerations for PCB redesign?

A: Yes. The 74AC299SJ uses a 20-SOP package (5.30mm width) while the CD74AC299M96 uses a 20-SOIC package (7.50mm width). PCB footprint and land pattern must be updated accordingly. Both are surface mount packages compatible with standard assembly processes.

Q: What compliance certifications apply to these parts?

A: Both parts are REACH Unaffected. The CD74AC299M96 additionally meets ROHS3 compliance, making it suitable for applications requiring environmental and regulatory adherence to modern standards.