74AC11SCX AND Gate IC Equivalent & Substitute Parts

Part Overview

The 74AC11SCX is a 3-channel AND gate logic IC manufactured by onsemi in 14-SOIC surface mount packaging. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The 74AC11 series provides standard AND gate functionality across the 74AC logic family, with multiple manufacturers offering compatible alternatives in active production status.

Key Parameters

Parameter	Specification
Logic Type	AND Gate
Number of Circuits	3
Number of Inputs	3
Voltage Supply Range	2V to 6V
Current - Quiescent (Max)	2 µA to 4 µA
Current - Output High/Low	24mA / 24mA
Input Logic Level - Low	0.9V to 1.65V
Input Logic Level - High	2.1V to 3.85V
Max Propagation Delay	8ns @ 5V, 50pF
Operating Temperature	-40°C to 85°C
Package / Case	14-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the 74AC11SCX is determined by electrical and mechanical parameter compatibility within the 74AC logic family. All substitute parts maintain identical logic function (3-channel AND gate with 3 inputs per channel), package type (14-SOIC), and core electrical specifications including supply voltage range (2V to 6V), output current capability (24mA), input logic thresholds, and propagation delay (8ns @ 5V, 50pF).

Substitutes are grouped by manufacturer and packaging format:

Direct Manufacturer Substitutes (onsemi): MC74AC11DR2G and MC74AC11DG maintain full electrical equivalence with identical quiescent current specifications and active product status.

Cross-Manufacturer Substitutes (Texas Instruments): SN74AC11D, SN74AC11DR, and SN74AC11IDRG4Q1 provide parametric equivalence with matching electrical performance. The SN74AC11IDRG4Q1 variant includes automotive-grade qualification (AEC-Q100).

Packaging format differences (Tape & Reel, Tube, Cut Tape) do not affect electrical compatibility and are selected based on procurement and assembly requirements.

Parameter Comparison

Part Number	Manufacturer	Product Status	Packaging	Quiescent Current (Max)	RoHS Status	Qualification
74AC11SCX	onsemi	Obsolete	-	2 µA	-	-
MC74AC11DR2G	onsemi	Active	Tape & Reel (TR)	4 µA	ROHS3 Compliant	-
MC74AC11DG	onsemi	Active	Tube	4 µA	ROHS3 Compliant	-
SN74AC11D	Texas Instruments	Discontinued at DiGi Electronics	Tube	2 µA	ROHS3 Compliant	-
SN74AC11DR	Texas Instruments	Active	Cut Tape (CT) & Digi-Reel®	2 µA	ROHS3 Compliant	-
SN74AC11IDRG4Q1	Texas Instruments	Active	Tape & Reel (TR)	2 µA	ROHS3 Compliant	AEC-Q100 Automotive

Engineering Selection Recommendations

For new designs and ongoing production requiring 74AC11SCX replacement, select from active product status alternatives:

Primary Selection: SN74AC11DR (Texas Instruments) or MC74AC11DR2G (onsemi) provide active production status with full electrical equivalence and ROHS3 compliance. Both maintain the 14-SOIC package and support standard procurement channels.

Automotive Applications: SN74AC11IDRG4Q1 is specified for automotive-grade designs with AEC-Q100 qualification, maintaining identical electrical performance with enhanced reliability documentation.

Packaging Considerations: MC74AC11DG (Tube packaging) and MC74AC11DR2G (Tape & Reel) are selected based on assembly process requirements. SN74AC11DR offers Cut Tape and Digi-Reel options for flexible procurement volumes.

All substitute parts maintain compatibility with existing PCB layouts, assembly processes, and system-level electrical specifications of the 74AC11SCX.

Frequently Asked Questions (FAQ)

Q: Can SN74AC11DR directly replace 74AC11SCX in existing designs? A: Yes. SN74AC11DR maintains identical electrical specifications including supply voltage (2V to 6V), output current (24mA), input logic thresholds, and propagation delay (8ns @ 5V, 50pF). The 14-SOIC package is mechanically compatible with existing PCB layouts.

Q: What is the difference between MC74AC11DR2G and MC74AC11DG? A: Both parts are electrically identical onsemi 74AC11 variants with matching specifications. The primary difference is packaging format: MC74AC11DR2G is supplied in Tape & Reel format for automated assembly, while MC74AC11DG is supplied in Tube format for manual handling or lower-volume applications.

Q: Is the quiescent current difference between 2 µA and 4 µA significant? A: The quiescent current specification (2 µA for SN74AC11 variants and 74AC11SCX, 4 µA for MC74AC11 variants) represents maximum standby current consumption. For most applications, this difference is negligible. Selection should be based on active product status and availability rather than this specification variance.

Q: Why is SN74AC11IDRG4Q1 specified differently? A: SN74AC11IDRG4Q1 includes automotive-grade qualification (AEC-Q100) and is designated for automotive applications requiring enhanced reliability documentation and traceability. Electrical performance is identical to standard SN74AC11DR.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All active substitute parts (MC74AC11DR2G, MC74AC11DG, SN74AC11D, SN74AC11DR, and SN74AC11IDRG4Q1) are ROHS3 compliant. The original 74AC11SCX does not specify RoHS status due to its obsolete classification.

Q: What packaging format should be selected for high-volume production? A: Tape & Reel format (MC74AC11DR2G or SN74AC11IDRG4Q1) is standard for automated assembly processes. Cut Tape and Digi-Reel options (SN74AC11DR) provide flexibility for mixed-volume procurement.

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