74ACTQ08SCX AND Gate IC Equivalent & Substitute Parts

Part Overview

The 74ACTQ08SCX is a 4-channel 2-input AND gate logic IC manufactured by onsemi in 14-SOIC surface mount packaging. This part is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The 74ACTQ08SCX operates within the 4.5V to 5.5V supply voltage range and is suitable for general-purpose logic applications requiring AND gate functionality with standard TTL-compatible input and output levels.

Key Parameters

Parameter	Value
Logic Type	AND Gate
Number of Circuits	4
Number of Inputs	2
Voltage - Supply	4.5V ~ 5.5V
Current - Output High, Low	24mA, 24mA
Input Logic Level - Low	0.8V
Input Logic Level - High	2V
Max Propagation Delay @ 5V, 50pF	6.5ns
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

Substitute parts for the 74ACTQ08SCX are qualified based on the following criteria:

Logic type, circuit count, and input configuration (4-channel 2-input AND gate)
Supply voltage range (4.5V ~ 5.5V)
Output drive capability (24mA, 24mA)
Input logic thresholds (0.8V low, 2V high)
Package type (14-SOIC surface mount)
Operating temperature range compatibility
Moisture sensitivity level (MSL 1)

Substitutes are grouped into two categories: active product status parts suitable for new designs, and obsolete or discontinued parts available for legacy system maintenance. Propagation delay variations within the 74ACT08 family are acceptable for most general-purpose logic applications where timing margins permit.

Parameter Comparison

Part Number	Manufacturer	Status	Voltage Supply	Quiescent Current (Max)	Output Drive (mA)	Propagation Delay @ 5V, 50pF	Operating Temp	Package	RoHS Status
74ACTQ08SCX	onsemi	Obsolete	4.5V ~ 5.5V	2 µA	24, 24	6.5ns	-40°C ~ 85°C	14-SOIC	REACH Unaffected
74ACT08SCX	onsemi	Active	4.5V ~ 5.5V	4 µA	24, 24	9ns	-40°C ~ 85°C	14-SOIC	ROHS3 Compliant
MC74ACT08DG	onsemi	Active	4.5V ~ 5.5V	4 µA	24, 24	9ns	-40°C ~ 85°C	14-SOIC	ROHS3 Compliant
MC74ACT08DR2G	onsemi	Active	4.5V ~ 5.5V	4 µA	24, 24	9ns	-40°C ~ 85°C	14-SOIC	ROHS3 Compliant
CD74ACT08M	Harris Corporation	Obsolete	4.5V ~ 5.5V	4 µA	24, 24	12.9ns	-55°C ~ 125°C	14-SOIC	RoHS non-compliant
CD74ACT08M96	Texas Instruments	Active	4.5V ~ 5.5V	4 µA	24, 24	12.9ns	-55°C ~ 125°C	14-SOIC	ROHS3 Compliant
SN74ACT08D	Texas Instruments	Discontinued at DiGi Electronics	4.5V ~ 5.5V	2 µA	24, 24	9ns	-40°C ~ 85°C	14-SOIC	ROHS3 Compliant
SN74ACT08DR	Texas Instruments	Active	4.5V ~ 5.5V	2 µA	24, 24	9ns	-40°C ~ 85°C	14-SOIC	ROHS3 Compliant
SN74ACT08IDREP	Texas Instruments	Active	4.5V ~ 5.5V	2 µA	24, 24	9ns	-40°C ~ 85°C	14-SOIC	ROHS3 Compliant
SN74ACT08NSR	Texas Instruments	Active	4.5V ~ 5.5V	2 µA	24, 24	9ns	-40°C ~ 85°C	14-SO	ROHS3 Compliant

Engineering Selection Recommendations

For new designs, select from active product status parts with ROHS3 compliance: 74ACT08SCX, MC74ACT08DG, MC74ACT08DR2G, CD74ACT08M96, SN74ACT08DR, SN74ACT08IDREP, or SN74ACT08NSR. These parts meet current environmental and regulatory requirements.

The 74ACT08SCX, MC74ACT08DG, and MC74ACT08DR2G from onsemi are direct functional equivalents with identical electrical characteristics and packaging. SN74ACT08DR, SN74ACT08IDREP, and SN74ACT08NSR from Texas Instruments provide equivalent functionality with matching quiescent current specifications.

CD74ACT08M96 from Texas Instruments offers extended operating temperature range (-55°C ~ 125°C) compared to the standard -40°C ~ 85°C range, suitable for industrial or automotive applications requiring wider temperature performance.

For legacy system maintenance where the 74ACTQ08SCX is required, CD74ACT08M from Harris Corporation remains available as an obsolete part alternative, though RoHS non-compliance should be evaluated against application requirements.

Frequently Asked Questions (FAQ)

Q: Can I use 74ACT08SCX as a direct replacement for 74ACTQ08SCX?

A: Yes. Both parts share identical electrical specifications including supply voltage (4.5V ~ 5.5V), output drive capability (24mA), input logic thresholds, and 14-SOIC packaging. The 74ACT08SCX is active product status with ROHS3 compliance, making it suitable for new designs.

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

A: All parts meet the same functional requirements for 4-channel 2-input AND gate operation. Texas Instruments parts SN74ACT08DR, SN74ACT08IDREP, and SN74ACT08NSR match the 74ACTQ08SCX quiescent current specification (2 µA). onsemi parts 74ACT08SCX, MC74ACT08DG, and MC74ACT08DR2G specify 4 µA quiescent current. Propagation delay differences (6.5ns to 12.9ns) are acceptable for general-purpose logic applications.

Q: Why does CD74ACT08M96 have a different operating temperature range?

A: CD74ACT08M96 is specified for -55°C ~ 125°C operation, compared to the standard -40°C ~ 85°C range. This extended range is provided by Texas Instruments for applications requiring wider temperature performance. All other electrical parameters remain compatible with the 74ACTQ08SCX.

Q: Is SN74ACT08NSR compatible with my PCB layout designed for 14-SOIC?

A: SN74ACT08NSR uses 14-SO packaging with 5.30mm width, compared to the standard 14-SOIC 3.90mm width. Physical footprint differences require PCB layout verification before substitution. Other parts maintain the standard 14-SOIC (0.154", 3.90mm) footprint.

Q: Which substitute part has the best availability?

A: MC74ACT08DR2G from onsemi shows the highest inventory level at 40,300 pieces. SN74ACT08DR from Texas Instruments is also well-stocked at 2,179 pieces. Both are active product status with ROHS3 compliance.

Q: Are all substitute parts RoHS compliant?

A: Most active product status parts are ROHS3 compliant. CD74ACT08M from Harris Corporation is RoHS non-compliant and obsolete. CD74ACT08M96 from Texas Instruments is ROHS3 compliant and active. Verify RoHS compliance requirements for your application before final part selection.

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