74ACT299MTCX Equivalent & Substitute Parts

Part Overview

The 74ACT299MTCX is an 8-bit universal shift register manufactured by onsemi, housed in a 20-TSSOP surface mount package. This component is classified as obsolete, making identification of compatible substitute parts essential for ongoing production and maintenance applications. The shift register provides tri-state output capability and operates across a 4.5V to 5.5V supply voltage range, serving applications requiring parallel-to-serial or serial-to-parallel data conversion with universal shift functionality.

Substiute Parts

74ACT299MTCX

onsemiIn Stock: 219974ACT299MTCX Datasheet

Current PartRFQ

CD74ACT299M96

Texas InstrumentsIn Stock: 1246CD74ACT299M96 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 74ACT299MTCX is determined by strict equivalence across the following critical parameters:

• Logic Family & Function: Both parts must be 74ACT series universal shift registers with 1 element, 8 bits per element, and tri-state output capability
• Electrical Specifications: Supply voltage range (4.5V ~ 5.5V) and logic family compatibility must be maintained
• Pin Configuration: 20-pin package requirement ensures functional pin-to-pin compatibility
• Mounting Technology: Surface mount designation required for PCB assembly compatibility

The CD74ACT299M96 manufactured by Texas Instruments meets all substitution criteria as a direct functional equivalent within the 74ACT logic family, maintaining identical shift register architecture and electrical characteristics despite packaging format differences.

Parameter Comparison

Engineering Selection Recommendations

The CD74ACT299M96 is the qualified substitute for the obsolete 74ACT299MTCX. Selection is based on the following engineering factors:

Product Status: The CD74ACT299M96 maintains active production status with Texas Instruments, ensuring long-term availability and supply chain continuity compared to the obsolete onsemi part.

Compliance & Certifications: Both parts share identical REACH and ECCN classifications (REACH Unaffected, EAR99), maintaining regulatory compliance across applications. The CD74ACT299M96 carries RoHS3 compliance certification, meeting modern environmental standards.

Electrical & Functional Equivalence: Identical supply voltage range (4.5V ~ 5.5V), logic family designation (74ACT), and shift register architecture ensure direct functional substitution without circuit redesign.

Package Compatibility: While the 74ACT299MTCX uses 20-TSSOP packaging and the CD74ACT299M96 uses 20-SOIC packaging, both maintain 20-pin surface mount configurations with identical pin assignments, allowing footprint adaptation through standard PCB layout modifications.

Operating Temperature Range: The CD74ACT299M96 provides an extended operating temperature range (-55°C ~ 125°C) compared to the original part (-40°C ~ 85°C), offering improved performance margin in temperature-sensitive applications.

Frequently Asked Questions (FAQ)

Q: Can the CD74ACT299M96 be used as a direct pin-for-pin replacement for the 74ACT299MTCX?

A: Yes. Both parts maintain identical 20-pin configurations and pin assignments within the 74ACT logic family. The primary difference is package format: 20-TSSOP versus 20-SOIC. PCB footprint modification is required, but no circuit redesign or signal routing changes are necessary.

Q: What are the key differences between the 20-TSSOP and 20-SOIC packages?

A: The 20-TSSOP package has a width of 0.173" (4.40mm), while the 20-SOIC package has a width of 0.295" (7.50mm). Both are surface mount technologies with identical pin pitch and electrical characteristics. Package selection depends on available PCB real estate and assembly equipment capabilities.

Q: Are there any electrical performance differences between these parts?

A: No. Both parts operate at identical supply voltage ranges (4.5V ~ 5.5V) and provide equivalent shift register functionality with tri-state outputs. The CD74ACT299M96 offers an extended operating temperature range, which may provide additional margin in extreme temperature environments.

Q: Why is the 74ACT299MTCX marked as obsolete?

A: Obsolescence typically reflects manufacturer discontinuation decisions based on market demand and product lifecycle management. The CD74ACT299M96 remains in active production, ensuring continued availability for new designs and legacy system maintenance.

Q: What compliance certifications apply to both parts?

A: Both parts are REACH Unaffected and classified as EAR99 for export control purposes. The CD74ACT299M96 additionally carries RoHS3 compliance certification, meeting current environmental and hazardous substance restrictions.

Q: Can I use the CD74ACT299M96 in applications originally designed for the 74ACT299MTCX?

A: Yes, provided the PCB layout accommodates the 20-SOIC package footprint. Electrical and functional compatibility is complete. Verify that your assembly process supports the SOIC package format and that thermal management requirements are met.