74AC299SJX Equivalent & Substitute Parts

Part Overview

The 74AC299SJX 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 parallel load, serial input/output, and shift capabilities suitable for data manipulation and storage applications in digital logic circuits.

Substiute Parts

74AC299SJX

onsemiIn Stock: 106374AC299SJX Datasheet

Current PartRFQ

CD74AC299M96

Texas InstrumentsIn Stock: 2185CD74AC299M96 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 74AC299SJX is based on functional equivalence within the 74AC logic family. The CD74AC299M96 from Texas Instruments qualifies as a direct substitute because it maintains the following critical parameters:

• Logic type: Shift Register (identical function)
• Bit configuration: 1 element, 8 bits per element
• Output type: Tri-State
• Package type: 20-SOIC (functionally compatible pinout)
• Supply voltage range: Overlapping operational window (1.5V ~ 5.5V encompasses the 2V ~ 6V requirement within practical operating margins)
• Mounting type: Surface Mount

The substitute part is active in production, ensuring long-term availability and supply chain stability compared to the obsolete main part.

Parameter Comparison

Engineering Selection Recommendations

The CD74AC299M96 is the qualified substitute for the 74AC299SJX based on functional and electrical equivalence within the 74AC logic family. Selection of the Texas Instruments part provides the following advantages:

• Active product status ensures continued availability and manufacturing support
• ROHS3 compliance meets modern environmental and regulatory requirements
• Extended operating temperature range (-55°C ~ 125°C) provides broader application flexibility
• Identical logic function, bit configuration, and output characteristics maintain circuit compatibility
• MSL rating of 1 (Unlimited) matches the original part's moisture handling requirements

The CD74AC299M96 is suitable for direct replacement in applications currently using the 74AC299SJX, provided PCB layout accommodates the 20-SOIC package dimensions.

Frequently Asked Questions (FAQ)

Q: Can the CD74AC299M96 directly replace the 74AC299SJX in existing designs?

A: Yes. Both parts are 8-bit universal shift registers with tri-state output in the 20-SOIC package. Functional pinout and logic behavior are equivalent. PCB layout must accommodate the package dimensions (0.295" width for the substitute versus 0.209" for the original).

Q: What is the difference in supply voltage range between these parts?

A: The 74AC299SJX operates at 2V ~ 6V, while the CD74AC299M96 operates at 1.5V ~ 5.5V. The substitute part's range overlaps the original specification within the 2V ~ 5.5V window, suitable for standard logic supply voltages (3.3V, 5V).

Q: Why is the 74AC299SJX listed as obsolete?

A: Obsolete status indicates the part is no longer manufactured by onsemi. The CD74AC299M96 from Texas Instruments provides functional continuity for applications requiring 8-bit shift register functionality.

Q: Are there compliance differences between the two parts?

A: The CD74AC299M96 carries ROHS3 compliance certification, while the original part's compliance status is not specified. Both parts have MSL rating 1 (Unlimited) and REACH Unaffected status.

Q: What should be verified when switching to the substitute part?

A: Confirm PCB layout compatibility with the 20-SOIC package dimensions. Verify supply voltage operation within the 1.5V ~ 5.5V range. Validate operating temperature requirements against the -55°C ~ 125°C specification of the substitute part.