74ACT14SC Equivalent & Substitute Parts

Part Overview

The 74ACT14SC is a 6-channel inverter IC with Schmitt trigger inputs manufactured by onsemi in 14-SOIC surface mount packaging. This logic component provides signal inversion with hysteresis characteristics suitable for noise-immune digital applications. The part is currently obsolete, making equivalent substitute parts necessary for ongoing production and maintenance applications. Substitute parts must maintain functional equivalence across core electrical parameters including supply voltage, output current capability, propagation delay, and operating temperature range.

Key Parameters

Parameter	Value
Logic Type	Inverter with Schmitt Trigger
Number of Circuits	6
Number of Inputs	1
Supply Voltage Range	4.5V to 5.5V
Output Current (High/Low)	24mA / 24mA
Quiescent Current (Max)	2 µA to 4 µA
Propagation Delay @ 5V, 50pF	10ns to 14.5ns
Operating Temperature	-40°C to 85°C or -55°C to 125°C
Package Type	14-SOIC Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 74ACT14SC is determined by the following criteria:

Primary Compatibility Requirements:

Identical logic function (6-channel inverter with Schmitt trigger)
Matching pin count and 14-SOIC package footprint
Supply voltage range 4.5V to 5.5V
Output current capability of 24mA minimum (both high and low)
Operating temperature range that encompasses or exceeds -40°C to 85°C

Secondary Compatibility Factors:

Propagation delay within acceptable system timing margins (10ns to 14.5ns @ 5V, 50pF)
Quiescent current specifications (2 µA to 4 µA maximum)
Input logic level thresholds compatible with standard TTL/CMOS signaling
RoHS3 compliance and equivalent environmental certifications

Substitute parts are grouped into two categories: direct functional equivalents (identical electrical specifications) and compatible alternatives (meeting all core requirements with minor parameter variations acceptable for most applications).

Parameter Comparison

Part Number	Manufacturer	Status	Quiescent Current (Max)	Propagation Delay @ 5V, 50pF	Operating Temp Range	Packaging	Inventory
74ACT14SC	onsemi	Obsolete	2 µA	10ns	-40°C to 85°C	14-SOIC	2,100 Pcs
MC74ACT14DR2G	onsemi	Active	4 µA	11.5ns	-40°C to 85°C	14-SOIC (CT/Digi-Reel)	235,100 Pcs
74ACT14SCX	onsemi	Active	2 µA	10ns	-40°C to 85°C	14-SOIC (CT/Digi-Reel)	11,774 Pcs
MC74ACT14DG	onsemi	Active	4 µA	11.5ns	-40°C to 85°C	14-SOIC (Tube)	2,038 Pcs
CD74ACT14M	Texas Instruments	Discontinued	4 µA	14.5ns	-55°C to 125°C	14-SOIC (Tube)	1,345 Pcs
CD74ACT14M96	Texas Instruments	Active	4 µA	14.5ns	-55°C to 125°C	14-SOIC (TR)	2,350 Pcs
SN74ACT14D	Texas Instruments	Discontinued	2 µA	11.5ns	-40°C to 85°C	14-SOIC (Tube)	1,562 Pcs
SN74ACT14DR	Texas Instruments	Active	2 µA	11.5ns	-40°C to 85°C	14-SOIC (CT/Digi-Reel)	1,153 Pcs
SN74ACT14DRE4	Texas Instruments	Obsolete	2 µA	11.5ns	-40°C to 85°C	14-SOIC (CT/Digi-Reel)	2,404 Pcs
SN74ACT14NSR	Texas Instruments	Active	2 µA	11.5ns	-40°C to 85°C	14-SO (TR)	2,641 Pcs

Engineering Selection Recommendations

Tier 1 - Direct Functional Equivalents (Recommended Primary Choices):

74ACT14SCX (onsemi) is the closest functional equivalent, matching the original 74ACT14SC in quiescent current (2 µA) and propagation delay (10ns). Active product status ensures long-term availability. Available in Cut Tape and Digi-Reel packaging with 11,774 units in stock.

SN74ACT14DR (Texas Instruments) provides equivalent performance with 2 µA quiescent current and 11.5ns propagation delay. Active status and substantial inventory (1,153 units) support production continuity. Cut Tape and Digi-Reel packaging accommodates automated assembly.

Tier 2 - Compatible Alternatives (Secondary Choices):

MC74ACT14DR2G (onsemi) and MC74ACT14DG (onsemi) accept 4 µA quiescent current and 11.5ns propagation delay while maintaining full functional compatibility. Both are active products with robust inventory levels (235,100 and 2,038 units respectively). Suitable for applications where slightly elevated quiescent current is acceptable.

CD74ACT14M96 (Texas Instruments) extends operating temperature to -55°C to 125°C, beneficial for industrial or automotive applications. Active status and 2,350 units in stock provide reliable supply. Propagation delay of 14.5ns remains within acceptable margins for most digital logic applications.

Tier 3 - Obsolete or Discontinued Parts (Not Recommended for New Designs):

SN74ACT14DRE4, CD74ACT14M, and SN74ACT14D are discontinued or obsolete. While inventory exists, these parts should not be selected for new production designs due to uncertain future availability.

Package Consideration:

SN74ACT14NSR uses 14-SO (0.209" width) instead of 14-SOIC (0.154" width). Verify PCB footprint compatibility before selection, as this represents a different physical package despite identical pin count and function.

Frequently Asked Questions (FAQ)

Q: Can I use MC74ACT14DR2G as a direct replacement for 74ACT14SC?

A: Yes. MC74ACT14DR2G is functionally compatible. The quiescent current increases from 2 µA to 4 µA maximum, and propagation delay increases from 10ns to 11.5ns. Both parameters remain within acceptable operating margins for standard digital logic applications. Verify your circuit timing requirements do not depend on the faster 10ns specification.

Q: What is the difference between 74ACT14SCX and MC74ACT14DR2G?

A: 74ACT14SCX matches the original 74ACT14SC exactly in electrical performance (2 µA quiescent current, 10ns propagation delay). MC74ACT14DR2G has slightly higher quiescent current (4 µA) and propagation delay (11.5ns). Choose 74ACT14SCX for timing-critical applications; MC74ACT14DR2G for general-purpose applications where the parameter differences are acceptable.

Q: Why does SN74ACT14NSR have a different package designation (14-SO vs 14-SOIC)?

A: SN74ACT14NSR uses a 14-SO package with 0.209" width, while the original 74ACT14SC and most substitutes use 14-SOIC with 0.154" width. These are physically different packages with different PCB footprints. Verify your PCB design accommodates the 14-SO footprint before selecting this part.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts carry RoHS3 compliance certification, matching the environmental compliance of the original 74ACT14SC.

Q: Which substitute offers the widest operating temperature range?

A: CD74ACT14M96 and CD74ACT14M both operate from -55°C to 125°C, compared to -40°C to 85°C for the original part. This extended range is beneficial for industrial, automotive, or extreme environment applications. CD74ACT14M96 is the active product in this category.

Q: What packaging options are available for high-volume production?

A: MC74ACT14DR2G offers the largest inventory (235,100 units) in Cut Tape and Digi-Reel format, optimized for automated pick-and-place assembly. CD74ACT14M96 provides 2,350 units in Tape & Reel format. Both support high-volume manufacturing requirements.

Q: Can I mix different substitute parts in the same design?

A: Yes, provided all selected parts meet your circuit's timing and current requirements. Mixing 74ACT14SCX (10ns) with MC74ACT14DR2G (11.5ns) is acceptable if system timing margins accommodate the slower propagation delay. Verify input logic level thresholds are compatible across all selected parts.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message