74ACTQ646SCX Equivalent & Substitute Parts

Part Overview

The 74ACTQ646SCX is a non-inverting transceiver logic IC manufactured by onsemi, featuring 1 element with 8 bits per element and 3-state output capability. Designed for 24-SOP surface mount packaging with supply voltage range of 4.5V to 5.5V, this component is classified as obsolete. Due to its obsolete status and limited availability, identifying equivalent and substitute parts is essential for design continuity and procurement flexibility in applications requiring non-inverting transceiver functionality.

Key Parameters

Parameter	Value
Manufacturer Part Number	74ACTQ646SCX
Manufacturer	onsemi
Logic Type	Transceiver, Non-Inverting
Number of Elements	1
Number of Bits per Element	8
Output Type	3-State
Current - Output High, Low	24mA, 24mA
Voltage - Supply	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount
Package / Case	24-SOIC (0.295", 7.50mm Width)
Product Status	Obsolete
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the 74ACTQ646SCX is determined by strict equivalence across the following critical parameters:

Logic Type: Transceiver, Non-Inverting
Number of Elements: 1
Number of Bits per Element: 8
Output Type: 3-State
Current - Output High, Low: 24mA, 24mA
Voltage - Supply: 4.5V ~ 5.5V
Mounting Type: Surface Mount
Package / Case: 24-SOIC (0.295", 7.50mm Width)

Substitute parts are classified into two categories:

Parametric Equivalents: Parts that match all critical electrical and mechanical parameters of the 74ACTQ646SCX, differing only in packaging format (24-SOIC vs. 24-SOP) or minor manufacturing variations.

Similar Parts: Parts that maintain functional equivalence and core parameter alignment but may have variations in product status, operating temperature range, or compliance certifications.

Parameter Comparison

Part Number	Manufacturer	Logic Type	Elements / Bits	Output Type	Current (mA)	Supply Voltage	Operating Temp	Package	Product Status
74ACTQ646SCX	onsemi	Transceiver, Non-Inverting	1 / 8	3-State	24, 24	4.5V ~ 5.5V	-40°C ~ 85°C	24-SOP	Obsolete
MC74ACT646DWR2G	onsemi	Transceiver, Non-Inverting	1 / 8	3-State	24, 24	4.5V ~ 5.5V	-40°C ~ 85°C	24-SOIC	Obsolete
MC74ACT652DWR2G	onsemi	Transceiver, Non-Inverting	1 / 8	3-State	24, 24	4.5V ~ 5.5V	-40°C ~ 85°C	24-SOIC	Obsolete
CD74ACT646M	Harris Corporation	Transceiver, Non-Inverting	1 / 8	3-State	24, 24	4.5V ~ 5.5V	-55°C ~ 125°C	24-SOIC	Obsolete
CD74ACT646M96	Texas Instruments	Transceiver, Non-Inverting	1 / 8	3-State	24, 24	4.5V ~ 5.5V	-55°C ~ 125°C	24-SOIC	Active
MC74ACT646DWG	onsemi	Transceiver, Non-Inverting	1 / 8	3-State	24, 24	4.5V ~ 5.5V	-40°C ~ 85°C	24-SOIC	Obsolete
74ACT11245DWR	Texas Instruments	Transceiver, Non-Inverting	1 / 8	3-State	24, 24	4.5V ~ 5.5V	-40°C ~ 85°C	24-SOIC	Active

Engineering Selection Recommendations

For Active Product Status Requirement:

CD74ACT646M96 (Texas Instruments) and 74ACT11245DWR (Texas Instruments) are the only substitute options with active product status. Both maintain full electrical and mechanical compatibility with the 74ACTQ646SCX while offering extended operating temperature range (-55°C to 125°C) and ROHS3 compliance. CD74ACT646M96 is available in Tape & Reel packaging with MSL 1 rating, suitable for high-volume automated assembly.

For Obsolete Product Compatibility:

MC74ACT646DWR2G and MC74ACT646DWG (onsemi) provide direct functional equivalence with identical electrical specifications and operating temperature range. Both are available in 24-SOIC packaging. MC74ACT646DWR2G offers ROHS3 compliance and MSL 3 rating.

For Extended Temperature Range:

CD74ACT646M (Harris Corporation) and CD74ACT646M96 (Texas Instruments) support -55°C to 125°C operating temperature, exceeding the 74ACTQ646SCX specification of -40°C to 85°C. This extended range provides design margin for applications in industrial or automotive environments.

For Compliance Considerations:

All substitute parts maintain REACH Unaffected status and EAR99 classification matching the original part. ROHS3 compliance is available in MC74ACT646DWR2G, MC74ACT646DWG, CD74ACT646M96, and 74ACT11245DWR.

Frequently Asked Questions (FAQ)

Q: Can MC74ACT646DWR2G directly replace 74ACTQ646SCX in existing designs?

A: Yes. MC74ACT646DWR2G is a parametric equivalent with identical electrical specifications (24mA output current, 4.5V to 5.5V supply, -40°C to 85°C operating range) and compatible 24-SOIC packaging. The primary difference is packaging format (24-SOIC vs. 24-SOP), which requires PCB layout verification for pin compatibility.

Q: What is the difference between 24-SOP and 24-SOIC packaging?

A: Both are surface mount packages with 24 pins and 0.295" (7.50mm) width. The primary distinction lies in lead pitch and footprint geometry. PCB design files must be updated to accommodate the specific package variant. Consult manufacturer datasheets for precise dimensional specifications.

Q: Why should I consider CD74ACT646M96 over other substitutes?

A: CD74ACT646M96 is the only substitute with active product status, ensuring long-term availability and supply chain stability. It also provides extended operating temperature range (-55°C to 125°C) and ROHS3 compliance. These characteristics make it suitable for new designs requiring long-term component support.

Q: Are all substitute parts pin-compatible with the original 74ACTQ646SCX?

A: All listed substitutes maintain identical pin configuration and electrical function as non-inverting transceivers with 8-bit per element capacity and 3-state output. Pin compatibility is confirmed across all parts. However, packaging format differences (24-SOP vs. 24-SOIC) require PCB footprint verification.

Q: What is the MSL rating and why does it matter?

A: Moisture Sensitivity Level (MSL) indicates the component's sensitivity to moisture absorption during storage and handling. MSL 1 (unlimited shelf life) is superior to MSL 3 (168 hours). For high-reliability applications or extended storage periods, prioritize parts with MSL 1 rating such as CD74ACT646M96 or 74ACT11245DWR.

Q: Can I use 74ACT11245DWR as a substitute if my design requires -40°C to 85°C operation?

A: Yes. 74ACT11245DWR supports -40°C to 85°C operating temperature, matching the 74ACTQ646SCX specification. It is manufactured by Texas Instruments with active product status, ROHS3 compliance, and MSL 1 rating, making it a reliable long-term substitute.

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