74AC299SCX Equivalent & Substitute Parts

Part Overview

The 74AC299SCX 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 new designs and production continuity. The 74AC299 series provides shift/storage register functionality suitable for digital logic applications requiring data manipulation and temporary storage capabilities.

Substiute Parts

74AC299SCX

onsemiIn Stock: 168374AC299SCX Datasheet

Current PartRFQ

CD74AC299M96

Texas InstrumentsIn Stock: 2185CD74AC299M96 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 74AC299SCX is based on the following critical parameters:

• Logic Function: Universal shift register with 1 element, 8 bits per element
• Output Configuration: Tri-state output capability
• Package Compatibility: 20-SOIC surface mount package (0.295", 7.50mm width)
• Electrical Characteristics: Supply voltage range and operating temperature range
• Base Product Series: 74AC299 logic family

The CD74AC299M96 from Texas Instruments qualifies as a direct substitute because it maintains identical logic function, element count, bit width, output type, and package specification. Differences in supply voltage range and operating temperature represent extended operational capability rather than incompatibility.

Parameter Comparison

Engineering Selection Recommendations

The CD74AC299M96 is the qualified substitute for the 74AC299SCX based on functional and package equivalence. The Texas Instruments part offers active product status, ensuring continued availability and manufacturing support. The CD74AC299M96 provides extended operating temperature range (-55°C to 125°C versus -40°C to 85°C) and RoHS3 compliance, meeting modern regulatory requirements. The lower minimum supply voltage (1.5V versus 2V) expands application flexibility without affecting compatibility in standard 2V to 6V operating conditions.

Frequently Asked Questions (FAQ)

Q: Can the CD74AC299M96 directly replace the 74AC299SCX in existing designs?

A: Yes. Both parts share identical logic function, element configuration, bit width, output type, and 20-SOIC package specification. Pin-to-pin compatibility is maintained.

Q: What are the key differences between these parts?

A: The CD74AC299M96 has extended operating temperature range (-55°C to 125°C versus -40°C to 85°C), lower minimum supply voltage (1.5V versus 2V), and active product status with RoHS3 compliance. These represent enhanced capabilities rather than limitations.

Q: Why is the 74AC299SCX listed as obsolete?

A: Obsolete status indicates the part is no longer manufactured by onsemi. The CD74AC299M96 provides functional continuity for applications requiring 74AC299 shift register functionality.

Q: Are there any package or pinout considerations for substitution?

A: Both parts use identical 20-SOIC packaging with 0.295" width (7.50mm). No PCB layout modifications are required for substitution.

Q: What compliance certifications apply to the substitute part?

A: The CD74AC299M96 is RoHS3 compliant and REACH unaffected, meeting current environmental and regulatory standards.