74ACTQ14SCX Equivalent & Substitute Parts

Part Overview

The 74ACTQ14SCX is a 6-channel inverter IC with Schmitt trigger inputs manufactured by onsemi in 14-SOIC surface mount packaging. This logic inverter is designed for signal conditioning and digital logic applications requiring hysteresis input characteristics. The part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Logic Type	Inverter
Number of Circuits	6
Number of Inputs	1
Features	Schmitt Trigger
Voltage Supply Range	4.5V ~ 5.5V
Current - Quiescent (Max)	2 µA
Current - Output High/Low	24mA / 24mA
Max Propagation Delay	10ns @ 5V, 50pF
Operating Temperature	-40°C ~ 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 for the 74ACTQ14SCX is determined by the following critical parameters: logic type (inverter), circuit count (6 channels), Schmitt trigger feature, supply voltage range (4.5V ~ 5.5V), output drive capability (24mA), and package type (14-SOIC). Parts are grouped into three categories based on their relationship to the main part:

Parametric Equivalent: 74ACT14SCX matches all electrical specifications and quiescent current characteristics of the 74ACTQ14SCX while maintaining active product status and RoHS3 compliance.

Direct Substitutes: SN74ACT14D, SN74ACT14DR, and SN74ACT14DRE4 (Texas Instruments) provide identical functional performance with compatible electrical parameters. These parts differ in input logic level thresholds (0.5V ~ 1.4V low, 1.2V ~ 2.1V high) and propagation delay (11.5ns), which remain within acceptable operating margins for standard 74ACT logic applications.

Similar Substitutes: MC74ACT14DG, MC74ACT14DR2G (onsemi), CD74ACT14M, and CD74ACT14M96 (Texas Instruments) provide functional equivalence with variations in quiescent current (4 µA maximum) and propagation delay (11.5ns to 14.5ns). CD74ACT14M and CD74ACT14M96 support extended operating temperature range (-55°C ~ 125°C).

Package Variant: SN74ACT14NSR uses 14-SO packaging (0.209", 5.30mm width) instead of 14-SOIC, requiring PCB layout verification before substitution.

Parameter Comparison

Part Number	Manufacturer	Product Status	Quiescent Current (Max)	Propagation Delay @ 5V, 50pF	Operating Temperature	Package	RoHS Status
74ACTQ14SCX	onsemi	Obsolete	2 µA	10ns	-40°C ~ 85°C	14-SOIC	Not specified
74ACT14SCX	onsemi	Active	2 µA	10ns	-40°C ~ 85°C	14-SOIC	ROHS3 Compliant
SN74ACT14D	Texas Instruments	Discontinued at DiGi Electronics	2 µA	11.5ns	-40°C ~ 85°C	14-SOIC	ROHS3 Compliant
SN74ACT14DR	Texas Instruments	Active	2 µA	11.5ns	-40°C ~ 85°C	14-SOIC	ROHS3 Compliant
SN74ACT14DRE4	Texas Instruments	Obsolete	2 µA	11.5ns	-40°C ~ 85°C	14-SOIC	ROHS3 Compliant
MC74ACT14DG	onsemi	Active	4 µA	11.5ns	-40°C ~ 85°C	14-SOIC	ROHS3 Compliant
MC74ACT14DR2G	onsemi	Active	4 µA	11.5ns	-40°C ~ 85°C	14-SOIC	ROHS3 Compliant
CD74ACT14M	Texas Instruments	Discontinued at DiGi Electronics	4 µA	14.5ns	-55°C ~ 125°C	14-SOIC	ROHS3 Compliant
CD74ACT14M96	Texas Instruments	Active	4 µA	14.5ns	-55°C ~ 125°C	14-SOIC	ROHS3 Compliant
SN74ACT14NSR	Texas Instruments	Active	2 µA	11.5ns	-40°C ~ 85°C	14-SO	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: 74ACT14SCX (onsemi) is the direct parametric equivalent with active product status and RoHS3 compliance. This part maintains identical electrical performance to the 74ACTQ14SCX while ensuring long-term availability and regulatory compliance.

Active Product Alternatives: SN74ACT14DR (Texas Instruments), MC74ACT14DG, and MC74ACT14DR2G (onsemi) are actively manufactured and RoHS3 compliant. These parts accept the 1.5ns propagation delay increase and 2 µA quiescent current increase without functional impact in standard logic applications.

Extended Temperature Range: CD74ACT14M96 (Texas Instruments) supports -55°C ~ 125°C operation with RoHS3 compliance, suitable for industrial and automotive applications requiring wider temperature margins. The 4.5ns propagation delay increase is acceptable for non-critical timing paths.

Discontinued Parts: SN74ACT14D, SN74ACT14DRE4, and CD74ACT14M are discontinued at DiGi Electronics and should be avoided for new designs unless existing inventory is available and acceptable for the application lifecycle.

Package Consideration: SN74ACT14NSR uses 14-SO packaging (wider 5.30mm body) instead of 14-SOIC (3.90mm). This substitution requires PCB layout verification and is not recommended without physical footprint confirmation.

Frequently Asked Questions (FAQ)

Q: Can I directly replace 74ACTQ14SCX with 74ACT14SCX?

A: Yes. The 74ACT14SCX is a parametric equivalent with identical quiescent current (2 µA) and propagation delay (10ns). It maintains the same 14-SOIC package and operating temperature range (-40°C ~ 85°C). The primary advantage is active product status and RoHS3 compliance.

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

A: Both manufacturers produce functionally equivalent 74ACT14 inverter ICs in 14-SOIC packaging. onsemi versions (74ACT14SCX, MC74ACT14DG, MC74ACT14DR2G) and Texas Instruments versions (SN74ACT14DR, CD74ACT14M96) differ in quiescent current specifications and propagation delay characteristics. All are RoHS3 compliant and suitable for standard logic applications.

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

A: Quiescent current variation reflects manufacturing process differences between suppliers. The 2 µA maximum specification is more stringent than 4 µA. For applications sensitive to standby power consumption, select parts with 2 µA maximum rating (74ACT14SCX, SN74ACT14DR, SN74ACT14DRE4, SN74ACT14NSR).

Q: Is the 1.5ns propagation delay difference significant?

A: For most digital logic applications, the difference between 10ns and 11.5ns propagation delay is negligible. Critical timing paths should be analyzed against specific system requirements. CD74ACT14M96 with 14.5ns delay is suitable for non-critical signal conditioning applications.

Q: Can I use SN74ACT14NSR as a direct replacement?

A: SN74ACT14NSR is functionally equivalent but uses 14-SO packaging (5.30mm width) instead of 14-SOIC (3.90mm width). PCB footprint compatibility must be verified before substitution. The electrical specifications are identical to SN74ACT14DR.

Q: Which part should I select for new designs?

A: For new designs, select 74ACT14SCX (onsemi) or SN74ACT14DR (Texas Instruments). Both are actively manufactured, RoHS3 compliant, and provide reliable long-term availability. For extended temperature applications, CD74ACT14M96 supports -55°C ~ 125°C operation.

Q: Are all these parts pin-compatible?

A: Yes. All listed parts maintain identical pin configuration and 14-SOIC package footprint (except SN74ACT14NSR which uses 14-SO). Electrical characteristics are compatible within the specified parameter ranges for standard 74ACT logic applications.

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