74AC299MTC Equivalent & Substitute Parts

Part Overview

The 74AC299MTC is an 8-bit universal shift register with tri-state output, manufactured by onsemi in a 20-TSSOP surface mount package. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and production continuity. The 74AC299 logic family provides shift/storage register functionality suitable for digital signal processing and data manipulation applications. Identifying compatible alternatives ensures design flexibility and supply chain reliability.

Substiute Parts

74AC299MTC

onsemiIn Stock: 70074AC299MTC Datasheet

Current PartRFQ

CD74AC299M96

Texas InstrumentsIn Stock: 2185CD74AC299M96 Datasheet

DirectRFQ

CD74ACT299M96

Texas InstrumentsIn Stock: 1246CD74ACT299M96 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 74AC299MTC are identified based on the following core electrical and mechanical parameters:

• Logic Type: Shift Register (1 Element, 8 Bit)
• Output Type: Tri-State
• Function: Universal
• Mounting Type: Surface Mount
• Base Product Number: 74AC299 or 74ACT299 series
• Voltage Supply Range: Compatibility within specified operating ranges
• Operating Temperature Range: Extended or equivalent temperature specifications
• Moisture Sensitivity Level: MSL 1 (Unlimited)

Two substitute parts are available: CD74AC299M96 (direct equivalent, 74AC series) and CD74ACT299M96 (similar variant, 74ACT series with narrower voltage range).

Parameter Comparison

Engineering Selection Recommendations

CD74AC299M96 (Texas Instruments) is the direct functional equivalent and primary substitute for the 74AC299MTC. Both parts operate within the 74AC logic family with identical electrical specifications for shift register operation. The CD74AC299M96 is active in production status and ROHS3 compliant, providing long-term supply availability. The package change from 20-TSSOP to 20-SOIC requires PCB layout modification but maintains identical pin count and functional compatibility.

CD74ACT299M96 (Texas Instruments) is a similar variant within the 74ACT logic family. This part operates at a narrower voltage supply range (4.5V ~ 5.5V) compared to the 74AC series (1.5V ~ 5.5V). Selection of this variant is appropriate only for designs with fixed 5V supply specifications. Like the CD74AC299M96, it is active in production and ROHS3 compliant.

Both Texas Instruments substitutes provide extended operating temperature ranges (-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 CD74AC299M96 directly replace the 74AC299MTC without design changes?

A: The CD74AC299M96 is functionally equivalent in logic operation and pin count. However, the package change from 20-TSSOP to 20-SOIC requires PCB layout modification. Pin assignments remain identical, but physical footprint dimensions differ (TSSOP: 0.173" width vs. SOIC: 0.295" width).

Q: What is the difference between CD74AC299M96 and CD74ACT299M96?

A: Both are 8-bit universal shift registers with tri-state output. The primary difference is voltage supply range: CD74AC299M96 operates at 1.5V ~ 5.5V, while CD74ACT299M96 operates at 4.5V ~ 5.5V. The 74ACT variant is suitable only for fixed 5V supply designs. Both share identical operating temperature ranges and are ROHS3 compliant.

Q: Why is the 74AC299MTC marked as obsolete?

A: The 74AC299MTC is an older onsemi product. Active alternatives from Texas Instruments (CD74AC299M96 and CD74ACT299M96) provide equivalent functionality with current production status and improved compliance certifications.

Q: Are there any compliance differences between the original and substitute parts?

A: The original 74AC299MTC compliance status is not specified in available data. Both Texas Instruments substitutes are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

Q: What is the impact of the extended operating temperature range on substitute selection?

A: The substitute parts (CD74AC299M96 and CD74ACT299M96) operate from -55°C ~ 125°C compared to the original -40°C ~ 85°C. This extended range provides additional thermal margin and is suitable for all applications within the original temperature specification.