74AC14SCX Equivalent & Substitute Parts

Part Overview

The 74AC14SCX is a 6-channel Schmitt trigger inverter logic IC manufactured by onsemi in 14-SOIC surface mount packaging. This component is actively produced and widely used in digital logic applications requiring noise immunity and signal conditioning. Substitute parts are necessary when the primary part becomes unavailable, when alternative packaging formats are required for specific assembly processes, or when sourcing from multiple manufacturers is needed for supply chain resilience.

Key Parameters

Parameter	Value
Logic Type	Inverter
Number of Circuits	6
Number of Inputs	6
Features	Schmitt Trigger
Voltage Supply Range	2V ~ 6V
Current - Quiescent (Max)	2 µA
Current - Output High/Low	24mA / 24mA
Input Logic Level - Low	0.5V ~ 1.1V
Input Logic Level - High	2.2V ~ 3.9V
Max Propagation Delay @ 5V, 50pF	10ns
Operating Temperature	-40°C ~ 85°C
Mounting Type	Surface Mount
Package / Case	14-SOIC (0.154", 3.90mm Width)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the 74AC14SCX is determined by strict equivalence in the following critical parameters:

Logic type (Inverter) and circuit configuration (6-channel Schmitt trigger)
Electrical specifications: supply voltage range, input/output logic levels, propagation delay, and output current capability
Package compatibility: 14-SOIC surface mount form factor
Operating temperature range and environmental compliance

Substitute parts are grouped into three categories based on their relationship to the main part:

Direct Manufacturer Equivalents maintain identical electrical specifications and packaging, differing only in manufacturer or packaging format (Tape & Reel vs. Tube).

Similar Manufacturer Parts share the same logic function and package but may have minor variations in quiescent current or operating temperature range within acceptable limits for most applications.

Parametric Equivalents provide functional equivalence with identical key electrical characteristics and package specifications.

Parameter Comparison

Part Number	Manufacturer	Packaging	Quiescent Current (Max)	Voltage Supply	Propagation Delay @ 5V, 50pF	Operating Temperature	Product Status	Inventory
74AC14SCX	onsemi	Tape & Reel (TR)	2 µA	2V ~ 6V	10ns	-40°C ~ 85°C	Active	8826 Pcs
MC74AC14DR2G	onsemi	Tape & Reel (TR)	4 µA	2V ~ 6V	10ns	-40°C ~ 85°C	Active	20600 Pcs
MC74AC14DG	onsemi	Tube	4 µA	2V ~ 6V	10ns	-40°C ~ 85°C	Active	1784 Pcs
SN74AC14D	Texas Instruments	Tube	2 µA	2V ~ 6V	10ns	-40°C ~ 85°C	Discontinued at DiGi Electronics	235342 Pcs
CD74AC14M96	Texas Instruments	Tape & Reel (TR)	4 µA	1.5V ~ 5.5V	10.5ns	-55°C ~ 125°C	Active	4498 Pcs
SN74AC14NSR	Texas Instruments	Cut Tape (CT) & Digi-Reel®	2 µA	2V ~ 6V	10ns	-40°C ~ 85°C	Active	65980 Pcs
SN74AC14DR	Texas Instruments	Cut Tape (CT) & Digi-Reel®	2 µA	2V ~ 6V	10ns	-40°C ~ 85°C	Active	15688 Pcs

Engineering Selection Recommendations

For direct replacement with identical specifications: SN74AC14DR and SN74AC14NSR from Texas Instruments are parametrically equivalent to the 74AC14SCX, maintaining 2 µA quiescent current, 10ns propagation delay, and -40°C to 85°C operating range. Both are actively produced and ROHS3 compliant. SN74AC14DR is available in Cut Tape & Digi-Reel packaging with higher inventory (15688 Pcs), while SN74AC14NSR offers the same specifications in alternative packaging format.

For onsemi sourcing: MC74AC14DR2G provides direct manufacturer equivalence with Tape & Reel packaging and the highest inventory availability (20600 Pcs). The 4 µA quiescent current specification is acceptable for most applications and does not affect functional compatibility. MC74AC14DG offers the same electrical performance in Tube packaging for lower-volume requirements.

For extended temperature range applications: CD74AC14M96 from Texas Instruments extends the operating temperature range to -55°C to 125°C and supports a lower supply voltage floor of 1.5V. This part is suitable for industrial and automotive environments where the 74AC14SCX temperature range is insufficient. The 10.5ns propagation delay and 4 µA quiescent current remain within acceptable functional parameters.

For supply chain resilience: Maintain dual sourcing between onsemi (MC74AC14DR2G) and Texas Instruments (SN74AC14DR or SN74AC14NSR) to ensure continuity of supply and mitigate single-source dependency.

Frequently Asked Questions (FAQ)

Q: Can MC74AC14DR2G replace 74AC14SCX directly? A: Yes. Both parts share identical logic function, package (14-SOIC), voltage supply range (2V ~ 6V), output current (24mA), and propagation delay (10ns). The 4 µA quiescent current in MC74AC14DR2G versus 2 µA in 74AC14SCX represents a minor increase in standby power consumption that does not affect functional compatibility in most applications.

Q: What is the difference between SN74AC14D and SN74AC14DR? A: Both are Texas Instruments 74AC14 inverters with identical electrical specifications. SN74AC14D is supplied in Tube packaging, while SN74AC14DR is supplied in Cut Tape & Digi-Reel format. SN74AC14D is discontinued at DiGi Electronics, making SN74AC14DR the preferred active alternative.

Q: Is CD74AC14M96 compatible with the 74AC14SCX? A: CD74AC14M96 is functionally compatible but operates over an extended temperature range (-55°C to 125°C) and lower supply voltage floor (1.5V vs. 2V). Use this part only when the extended specifications are required, as it introduces unnecessary cost and complexity for standard -40°C to 85°C applications.

Q: Why does packaging format matter for substitution? A: Packaging format (Tape & Reel, Tube, Cut Tape & Digi-Reel) affects assembly process compatibility and handling requirements. Tape & Reel is standard for automated pick-and-place assembly, while Tube packaging is used for manual assembly or lower-volume production. Verify packaging compatibility with your assembly process before substitution.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All listed substitute parts maintain ROHS3 compliance, Moisture Sensitivity Level 1 (Unlimited), and REACH Unaffected status, matching the environmental and regulatory compliance of the 74AC14SCX.

Q: Which substitute offers the best inventory availability? A: SN74AC14NSR from Texas Instruments offers the highest inventory (65980 Pcs), followed by MC74AC14DR2G from onsemi (20600 Pcs) and SN74AC14D from Texas Instruments (235342 Pcs, though discontinued at DiGi Electronics).

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