74AC05SCX Equivalent & Substitute Parts

Part Overview

The 74AC05SCX is a 6-channel inverter IC with open drain outputs in a 14-SOIC surface mount package, manufactured by onsemi. This logic component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The part operates across a 2V to 6V supply voltage range with a maximum propagation delay of 14ns at 5V with 50pF load.

Key Parameters

Parameter	Value
Logic Type	Inverter
Number of Circuits	6
Number of Inputs	1
Features	Open Drain
Voltage - Supply	2V ~ 6V
Current - Quiescent (Max)	4 µA
Current - Output High, Low	-, 24mA
Package / Case	14-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Operating Temperature	-40°C ~ 85°C

Substitute Part Grouping Explanation

Substitution for the 74AC05SCX is determined by the following critical parameters:

Logic Function: All substitutes must be 6-channel inverters with open drain outputs
Package Type: All substitutes must use 14-SOIC surface mount packaging
Supply Voltage Compatibility: Substitutes must support the 2V to 6V operating range
Output Current: All substitutes must support 24mA maximum output current
Quiescent Current: Maximum 4 µA specification must be maintained

Substitutes are grouped into two categories:

Direct Substitutes (onsemi): MC74AC05DG and MC74AC05DR2G maintain identical electrical specifications with improved propagation delay (6ns vs 14ns) and active product status.

Similar Substitutes (Texas Instruments): CD74AC05M and CD74AC05M96 provide functional equivalence with extended supply voltage range (1.5V ~ 5.5V) and wider operating temperature range (-55°C ~ 125°C), though with slightly different input logic levels.

Parameter Comparison

Parameter	74AC05SCX	MC74AC05DG	MC74AC05DR2G	CD74AC05M	CD74AC05M96
Manufacturer	onsemi	onsemi	onsemi	Texas Instruments	Texas Instruments
Product Status	Obsolete	Active	Active	Discontinued at DiGi Electronics	Active
Logic Type	Inverter	Inverter	Inverter	Inverter	Inverter
Number of Circuits	6	6	6	6	6
Features	Open Drain	Open Drain	Open Drain	Open Drain	Open Drain
Voltage - Supply	2V ~ 6V	2V ~ 6V	2V ~ 6V	1.5V ~ 5.5V	1.5V ~ 5.5V
Current - Quiescent (Max)	4 µA	4 µA	4 µA	4 µA	4 µA
Current - Output High, Low	-, 24mA	-, 24mA	-, 24mA	-, 24mA	-, 24mA
Max Propagation Delay @ V, Max CL	14ns @ 5V, 50pF	6ns @ 5V, 50pF	6ns @ 5V, 50pF	8.2ns @ 5V, 50pF	8.2ns @ 5V, 50pF
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-55°C ~ 125°C	-55°C ~ 125°C
Package / Case	14-SOIC	14-SOIC	14-SOIC	14-SOIC	14-SOIC
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging Option	Not specified	Tube	Tape & Reel (TR)	Tube	Cut Tape (CT) & Digi-Reel®

Engineering Selection Recommendations

For Direct Replacement: MC74AC05DG and MC74AC05DR2G are the primary substitutes. Both are manufactured by onsemi with active product status and ROHS3 compliance. These parts maintain identical electrical specifications to the 74AC05SCX while offering improved propagation delay performance. MC74AC05DG is supplied in tube packaging, while MC74AC05DR2G is supplied in tape and reel format for automated assembly.

For Extended Temperature Range Applications: CD74AC05M96 is the recommended choice when operating temperature range of -55°C to 125°C is required. This Texas Instruments part maintains all critical electrical parameters and is currently active. CD74AC05M is discontinued at DiGi Electronics and should not be selected for new designs.

Compliance Considerations: All active substitute parts (MC74AC05DG, MC74AC05DR2G, and CD74AC05M96) are ROHS3 compliant with REACH unaffected status, meeting modern environmental and regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can MC74AC05DG directly replace 74AC05SCX in existing designs?

A: Yes. MC74AC05DG is a direct substitute with identical electrical specifications, same 14-SOIC package, and compatible supply voltage range (2V ~ 6V). The improved propagation delay (6ns vs 14ns) provides performance enhancement without compatibility issues.

Q: What is the difference between MC74AC05DG and MC74AC05DR2G?

A: Both parts are electrically identical with the same specifications and performance. The difference is packaging: MC74AC05DG is supplied in tube format, while MC74AC05DR2G is supplied in tape and reel format. Selection depends on assembly process requirements.

Q: Why do Texas Instruments parts have different input logic levels?

A: CD74AC05M and CD74AC05M96 have input logic level specifications of 0.3V ~ 1.65V (low) and 1.2V ~ 3.85V (high), compared to onsemi parts at 0.9V ~ 1.65V (low) and 2.1V ~ 3.85V (high). Both meet the 74AC logic family standard and are functionally compatible. The Texas Instruments parts offer wider input threshold margins.

Q: Is CD74AC05M suitable for new designs?

A: No. CD74AC05M is discontinued at DiGi Electronics. For Texas Instruments sourcing, use CD74AC05M96, which is currently active.

Q: What are the key parameters that determine substitutability?

A: The critical parameters are: 6-channel inverter configuration, open drain output feature, 14-SOIC package, 2V to 6V supply voltage support, 24mA output current capability, and 4 µA maximum quiescent current. All listed substitutes meet these requirements.

Q: Can these parts be used in applications requiring -55°C to 125°C operation?

A: Only CD74AC05M96 supports the full -55°C to 125°C temperature range. The onsemi parts (74AC05SCX, MC74AC05DG, MC74AC05DR2G) are rated for -40°C to 85°C operation.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message