74ACTQ14SC Equivalent & Substitute Parts

Part Overview

The 74ACTQ14SC is a 6-channel inverter IC with Schmitt trigger inputs manufactured by onsemi in 14-SOIC surface mount packaging. This logic component is classified as obsolete, making equivalent and substitute parts necessary for ongoing production and maintenance applications. The part operates within a 4.5V to 5.5V supply voltage range and is suitable for digital signal conditioning and logic inversion applications requiring hysteresis input characteristics.

Key Parameters

Parameter	Value
Logic Type	Inverter
Number of Circuits	6
Number of Inputs	1
Features	Schmitt Trigger
Voltage - Supply	4.5V ~ 5.5V
Current - Output High, Low	24mA, 24mA
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

Substitution for the 74ACTQ14SC is determined by the following criteria:

Primary Substitution Parameters:

Logic type (Inverter with 6 channels, 1 input per channel)
Schmitt trigger functionality
Supply voltage range (4.5V ~ 5.5V)
Output current capability (24mA minimum for both high and low states)
Package type (14-SOIC surface mount)
Operating temperature range (-40°C ~ 85°C minimum)

Acceptable Variations:

Quiescent current: up to 4 µA (main part: 2 µA max)
Propagation delay: up to 14.5ns @ 5V, 50pF (main part: 10ns)
Input logic level thresholds: variations within specified ranges
Packaging format (Cut Tape, Tube, Tape & Reel) does not affect electrical compatibility
Product status (Active preferred over Obsolete or Discontinued)

Substitute parts must maintain identical pin configuration, package footprint, and functional behavior within the specified electrical parameters.

Parameter Comparison

Part Number	Manufacturer	Status	Quiescent Current (Max)	Propagation Delay @ 5V, 50pF	Input Logic Level - Low	Input Logic Level - High	Operating Temp Range	Packaging
74ACTQ14SC	onsemi	Obsolete	2 µA	10ns	0.8V	2V	-40°C ~ 85°C	14-SOIC
74ACT14SCX	onsemi	Active	2 µA	10ns	0.8V	2V	-40°C ~ 85°C	14-SOIC
MC74ACT14DG	onsemi	Active	4 µA	11.5ns	0.8V	2V	-40°C ~ 85°C	14-SOIC
MC74ACT14DR2G	onsemi	Active	4 µA	11.5ns	0.8V	2V	-40°C ~ 85°C	14-SOIC
SN74ACT14D	Texas Instruments	Discontinued at DiGi Electronics	2 µA	11.5ns	0.5V ~ 1.4V	1.2V ~ 2.1V	-40°C ~ 85°C	14-SOIC
SN74ACT14DR	Texas Instruments	Active	2 µA	11.5ns	0.5V ~ 1.4V	1.2V ~ 2.1V	-40°C ~ 85°C	14-SOIC
SN74ACT14DRE4	Texas Instruments	Obsolete	2 µA	11.5ns	0.5V ~ 1.4V	1.2V ~ 2.1V	-40°C ~ 85°C	14-SOIC
CD74ACT14M	Texas Instruments	Discontinued at DiGi Electronics	4 µA	14.5ns	0.8V	2V	-55°C ~ 125°C	14-SOIC
CD74ACT14M96	Texas Instruments	Active	4 µA	14.5ns	0.8V	2V	-55°C ~ 125°C	14-SOIC
SN74ACT14NSR	Texas Instruments	Active	2 µA	11.5ns	0.5V ~ 1.4V	1.2V ~ 2.1V	-40°C ~ 85°C	14-SO (5.30mm)

Engineering Selection Recommendations

Tier 1 - Direct Replacement (Preferred): 74ACT14SCX (onsemi) is the primary substitute. It maintains identical electrical specifications to the 74ACTQ14SC with active product status and ROHS3 compliance. This part provides the most direct functional equivalence with improved availability.

Tier 2 - Compatible Substitutes (Electrical Equivalence): SN74ACT14DR (Texas Instruments) and MC74ACT14DR2G (onsemi) are electrically compatible alternatives with active status. Both maintain the required 24mA output current, 4.5V-5.5V supply voltage, and -40°C to 85°C operating range. SN74ACT14DR offers tighter input logic level specifications (0.5V ~ 1.4V low, 1.2V ~ 2.1V high) compared to the main part.

Tier 3 - Extended Temperature Range: CD74ACT14M96 (Texas Instruments) extends the operating temperature range to -55°C ~ 125°C with active product status. This part accepts slightly higher quiescent current (4 µA) and propagation delay (14.5ns) but maintains ROHS3 compliance and is suitable for applications requiring wider temperature operation.

Tier 4 - Package Variant: SN74ACT14NSR (Texas Instruments) uses a 14-SO package (5.30mm width) instead of 14-SOIC (3.90mm width). This part is electrically equivalent but requires PCB layout modification due to different package dimensions.

All recommended substitutes maintain ROHS3 compliance and MSL 1 rating. Product status prioritization: Active > Discontinued at DiGi Electronics > Obsolete.

Frequently Asked Questions (FAQ)

Q: Can I use SN74ACT14NSR as a direct replacement for 74ACTQ14SC? A: SN74ACT14NSR is electrically compatible but uses a different package footprint (14-SO with 5.30mm width versus 14-SOIC with 3.90mm width). PCB layout modification is required. If package footprint compatibility is critical, use 74ACT14SCX, SN74ACT14DR, or MC74ACT14DR2G instead.

Q: What is the difference between onsemi and Texas Instruments versions? A: Both manufacturers produce functionally equivalent 74ACT14 inverter ICs. onsemi versions (74ACT14SCX, MC74ACT14DG, MC74ACT14DR2G) use input logic levels of 0.8V (low) and 2V (high). Texas Instruments versions (SN74ACT14DR, SN74ACT14D) specify tighter ranges of 0.5V ~ 1.4V (low) and 1.2V ~ 2.1V (high). Both meet the 4.5V-5.5V supply and 24mA output current requirements.

Q: Is CD74ACT14M96 suitable for my application if I need -40°C to 85°C operation? A: Yes. CD74ACT14M96 operates across -55°C to 125°C, which exceeds the -40°C to 85°C requirement. The extended temperature range does not create compatibility issues for applications within the narrower range. However, quiescent current is 4 µA (versus 2 µA for the main part) and propagation delay is 14.5ns (versus 10ns).

Q: What does "Discontinued at DiGi Electronics" mean for product status? A: Parts marked "Discontinued at DiGi Electronics" are no longer actively distributed through DiGi Electronics but may remain available through other suppliers or in existing inventory. For new designs, prioritize parts with "Active" status to ensure long-term supply chain availability.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All listed substitute parts carry ROHS3 compliance certification. The main part 74ACTQ14SC does not specify ROHS status, but all active and discontinued substitutes meet ROHS3 requirements.

Q: Can I mix different manufacturers in the same circuit board? A: Yes. All substitute parts maintain identical pin configuration, package footprint (except SN74ACT14NSR), and electrical specifications within the specified ranges. Mixing onsemi and Texas Instruments parts on the same board is electrically compatible.

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