74ACTQ00SCX NAND Gate IC Equivalent & Substitute Parts

Part Overview

The 74ACTQ00SCX is a 4-channel 2-input NAND gate logic IC manufactured by onsemi in 14-SOIC surface mount packaging. This part is classified as obsolete, making substitute components necessary for new designs and ongoing production support. The 74ACTQ00SCX operates within the 4.5V to 5.5V supply voltage range and is suitable for general-purpose digital logic applications requiring NAND gate functionality.

Key Parameters

Parameter	Value
Logic Type	NAND Gate
Number of Circuits	4
Number of Inputs	2
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 @ V, Max CL	7.5ns @ 5V, 50pF
Operating Temperature	-40°C ~ 85°C
Mounting Type	Surface Mount
Package / Case	14-SOIC (0.154", 3.90mm Width)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the 74ACTQ00SCX are selected based on strict electrical and mechanical compatibility. The following parameters determine substitution eligibility:

Logic Type: NAND Gate (4 channels, 2 inputs per channel)
Voltage - Supply: 4.5V ~ 5.5V
Current - Output High, Low: 24mA, 24mA
Input Logic Level - Low: 0.8V
Input Logic Level - High: 2V
Package / Case: 14-SOIC (0.154", 3.90mm Width)
Mounting Type: Surface Mount

Substitute parts are grouped into two categories: direct electrical equivalents with identical or superior propagation delay specifications, and functionally compatible alternatives with extended operating temperature ranges or enhanced product status.

Parameter Comparison

Part Number	Manufacturer	Product Status	Voltage - Supply	Current - Quiescent (Max)	Current - Output High, Low	Input Logic Level - Low	Input Logic Level - High	Max Propagation Delay @ V, Max CL	Operating Temperature	Package / Case
74ACTQ00SCX	onsemi	Obsolete	4.5V ~ 5.5V	2 µA	24mA, 24mA	0.8V	2V	7.5ns @ 5V, 50pF	-40°C ~ 85°C	14-SOIC (0.154", 3.90mm Width)
74ACT00SCX	Fairchild Semiconductor	Active	4.5V ~ 5.5V	2 µA	24mA, 24mA	0.8V	2V	9ns @ 5V, 50pF	-40°C ~ 85°C	14-SOIC (0.154", 3.90mm Width)
MC74ACT00DG	onsemi	Active	4.5V ~ 5.5V	4 µA	24mA, 24mA	0.8V	2V	9ns @ 5V, 50pF	-55°C ~ 125°C	14-SOIC (0.154", 3.90mm Width)
MC74ACT00DR2G	onsemi	Active	4.5V ~ 5.5V	4 µA	24mA, 24mA	0.8V	2V	9ns @ 5V, 50pF	-55°C ~ 125°C	14-SOIC (0.154", 3.90mm Width)
CD74ACT00M	Harris Corporation	Obsolete	4.5V ~ 5.5V	4 µA	24mA, 24mA	0.8V	2V	13.2ns @ 5V, 50pF	-55°C ~ 125°C	14-SOIC (0.154", 3.90mm Width)
CD74ACT00M96	Harris Corporation	Obsolete	4.5V ~ 5.5V	4 µA	24mA, 24mA	0.8V	2V	13.2ns @ 5V, 50pF	-55°C ~ 125°C	14-SOIC (0.154", 3.90mm Width)
SN74ACT00D	Texas Instruments	Discontinued at DiGi Electronics	4.5V ~ 5.5V	2 µA	24mA, 24mA	0.8V	2V	9ns @ 5V, 50pF	-40°C ~ 85°C	14-SOIC (0.154", 3.90mm Width)
SN74ACT00DR	Texas Instruments	Active	4.5V ~ 5.5V	2 µA	24mA, 24mA	0.8V	2V	9ns @ 5V, 50pF	-40°C ~ 85°C	14-SOIC (0.154", 3.90mm Width)
SN74ACT00NSR	Texas Instruments	Active	4.5V ~ 5.5V	2 µA	24mA, 24mA	0.8V	2V	9ns @ 5V, 50pF	-40°C ~ 85°C	14-SOIC (0.209", 5.30mm Width)
SN74ACT00TDRQ1	Texas Instruments	Active	4.5V ~ 5.5V	2 µA	24mA, 24mA	0.8V	2V	9ns @ 5V, 50pF	-40°C ~ 105°C	14-SOIC (0.154", 3.90mm Width)

Engineering Selection Recommendations

For new designs and production applications, select from active product status parts with current manufacturer support. SN74ACT00DR (Texas Instruments) and 74ACT00SCX (Fairchild Semiconductor) are recommended as primary substitutes, offering active product status and electrical compatibility with the 74ACTQ00SCX.

MC74ACT00DG and MC74ACT00DR2G (onsemi) provide extended operating temperature range (-55°C to 125°C) and active product status, suitable for applications requiring wider temperature operation. The MC74ACT00DR2G is supplied in Tape & Reel packaging for high-volume production.

SN74ACT00TDRQ1 (Texas Instruments) is qualified to AEC-Q100 automotive standards with extended operating temperature to 105°C, appropriate for automotive and harsh environment applications.

Avoid obsolete parts (CD74ACT00M, CD74ACT00M96) and discontinued parts (SN74ACT00D) for new designs. SN74ACT00NSR uses a wider 14-SO package (0.209" width) compared to the standard 14-SOIC (0.154" width) and should be selected only when package footprint compatibility is confirmed.

Frequently Asked Questions (FAQ)

Q: Can I use SN74ACT00NSR as a direct replacement for 74ACTQ00SCX?

A: SN74ACT00NSR is electrically compatible but uses a different package footprint. The 14-SO package is 0.209" wide compared to the standard 14-SOIC at 0.154" width. PCB layout verification is required before substitution.

Q: What is the difference between MC74ACT00DG and MC74ACT00DR2G?

A: Both parts are electrically identical with identical electrical specifications. MC74ACT00DG is supplied in Tube packaging, while MC74ACT00DR2G is supplied in Tape & Reel (TR) packaging. Selection depends on packaging and handling requirements for production.

Q: Why do some substitute parts have higher quiescent current (4 µA vs 2 µA)?

A: The 4 µA quiescent current specification for MC74ACT00DG, MC74ACT00DR2G, CD74ACT00M, and CD74ACT00M96 remains within acceptable operating parameters for NAND gate logic applications. This difference does not affect functional compatibility or logic operation.

Q: Is SN74ACT00TDRQ1 suitable for non-automotive applications?

A: Yes. SN74ACT00TDRQ1 meets AEC-Q100 automotive qualification standards and is fully compatible with non-automotive applications. The extended operating temperature range (-40°C to 105°C) and automotive-grade reliability provide additional margin for demanding environments.

Q: What is the significance of the propagation delay difference between 7.5ns and 13.2ns?

A: The 74ACTQ00SCX specifies 7.5ns maximum propagation delay, while CD74ACT00M and CD74ACT00M96 specify 13.2ns. For timing-critical applications, verify that the slower propagation delay does not violate system timing requirements before substitution.

Q: Can I substitute 74ACT00SCX (Fairchild) for the obsolete 74ACTQ00SCX (onsemi)?

A: Yes. The 74ACT00SCX is electrically compatible with identical supply voltage, logic levels, and output current specifications. The 9ns propagation delay is slightly slower than the original 7.5ns specification but remains within standard ACT logic performance parameters.

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