74ACTQ04SCX Equivalent & Substitute Parts

Part Overview

The 74ACTQ04SCX is a 6-channel inverter logic IC manufactured by onsemi in a 14-SOIC surface mount package. This part is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement. The 74ACTQ04SCX operates within the 4.5V to 5.5V supply voltage range and is suitable for standard TTL-compatible logic applications requiring signal inversion across multiple channels.

Key Parameters

Parameter	Value
Logic Type	Inverter
Number of Circuits	6
Number of Inputs	1
Voltage - Supply	4.5V ~ 5.5V
Current - Quiescent (Max)	2 µA
Current - Output High, Low	24mA, 24mA
Input Logic Level - Low	0.8V
Input Logic Level - High	2V
Max Propagation Delay @ 5V, 50pF	7.5ns
Operating Temperature	-40°C ~ 85°C
Package / Case	14-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the 74ACTQ04SCX is determined by the following critical parameters:

Logic Function: All substitutes must be 6-channel inverter ICs with single input configuration
Supply Voltage Range: All substitutes must operate within 4.5V ~ 5.5V
Output Drive Capability: All substitutes must provide 24mA output current (high and low)
Input Logic Levels: All substitutes must maintain 0.8V low and 2V high thresholds
Package Type: All substitutes must use 14-SOIC surface mount packaging
Operating Temperature Range: Substitutes must support at minimum -40°C ~ 85°C operation

The 74ACTQ04SCX can be replaced by active-status equivalents from the 74ACT04 base product family, which maintain identical functional and electrical specifications while offering improved availability and compliance status.

Parameter Comparison

Part Number	Manufacturer	Status	Quiescent Current (Max)	Propagation Delay @ 5V, 50pF	Operating Temp	Package	RoHS Status
74ACTQ04SCX	onsemi	Obsolete	2 µA	7.5ns	-40°C ~ 85°C	14-SOIC	Not specified
74ACT04SCX	onsemi	Active	4 µA	8.5ns	-40°C ~ 85°C	14-SOIC	ROHS3 Compliant
MC74ACT04DR2G	onsemi	Active	4 µA	8.5ns	-40°C ~ 85°C	14-SOIC	ROHS3 Compliant
SN74ACT04D	Texas Instruments	Discontinued at DiGi Electronics	2 µA	8.5ns	-40°C ~ 85°C	14-SOIC	ROHS3 Compliant
SN74ACT04DR	Texas Instruments	Active	2 µA	8.5ns	-40°C ~ 85°C	14-SOIC	ROHS3 Compliant
SN74ACT04IDREP	Texas Instruments	Active	2 µA	8.5ns	-40°C ~ 85°C	14-SOIC	ROHS3 Compliant
SN74ACT04NSR	Texas Instruments	Active	2 µA	8.5ns	-40°C ~ 85°C	14-SO	ROHS3 Compliant
CD74ACT04M96	Harris Corporation	Obsolete	4 µA	9.3ns	-55°C ~ 125°C	14-SOIC	RoHS non-compliant

Engineering Selection Recommendations

Primary Substitutes (Active Status, Full Compliance)

The SN74ACT04DR and SN74ACT04IDREP from Texas Instruments are the preferred substitutes. Both parts maintain active product status, provide ROHS3 compliance, and match the original quiescent current specification of 2 µA. These parts are functionally equivalent with propagation delay specifications within acceptable engineering tolerances.

Secondary Substitutes (Active Status, Acceptable Compliance)

The 74ACT04SCX and MC74ACT04DR2G from onsemi are active alternatives with ROHS3 compliance. These parts exhibit slightly higher quiescent current (4 µA) and propagation delay (8.5ns) compared to the original specification, but remain within the functional requirements of the 74ACT04 logic family.

Alternative Consideration (Extended Temperature Range)

The CD74ACT04M96 from Harris Corporation provides an extended operating temperature range (-55°C ~ 125°C) but carries obsolete status and RoHS non-compliance, making it unsuitable for new designs requiring regulatory compliance.

Package Consideration

The SN74ACT04NSR uses a 14-SO package (0.209", 5.30mm width) rather than the standard 14-SOIC (0.154", 3.90mm width). While functionally equivalent, this package variant requires PCB layout verification for mechanical compatibility.

Frequently Asked Questions (FAQ)

Q: Can I directly replace 74ACTQ04SCX with 74ACT04SCX?

A: Yes. Both parts share identical logic function, supply voltage range, output drive capability, and input logic levels. The 74ACT04SCX is the active-status equivalent with improved availability and ROHS3 compliance. Propagation delay increases from 7.5ns to 8.5ns, which is acceptable for most TTL-compatible applications.

Q: What is the difference between the onsemi and Texas Instruments substitutes?

A: Both manufacturers provide functionally equivalent 74ACT04 inverter ICs. Texas Instruments parts (SN74ACT04DR, SN74ACT04IDREP) maintain the original 2 µA quiescent current specification. onsemi parts (74ACT04SCX, MC74ACT04DR2G) specify 4 µA quiescent current. Selection depends on power consumption requirements and packaging preference.

Q: Is the SN74ACT04NSR compatible with my PCB layout?

A: The SN74ACT04NSR uses a 14-SO package with 5.30mm width compared to the standard 14-SOIC at 3.90mm width. Pin pitch and electrical characteristics remain compatible, but physical footprint differs. Verify PCB layout spacing before substitution.

Q: Why is CD74ACT04M96 not recommended?

A: The CD74ACT04M96 is obsolete and RoHS non-compliant. While it offers extended temperature range (-55°C ~ 125°C), it does not meet modern regulatory requirements and has limited availability. Use only if extended temperature operation is critical and compliance exemptions are documented.

Q: What are the key electrical parameters I must verify for substitution?

A: Verify supply voltage range (4.5V ~ 5.5V), output drive current (24mA minimum), input logic thresholds (0.8V low, 2V high), and operating temperature range (-40°C ~ 85°C minimum). All listed substitutes meet these requirements. Propagation delay tolerance depends on application timing constraints.

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