74LCX14M Equivalent & Substitute Parts

Part Overview

The 74LCX14M is a 6-channel inverter IC with Schmitt trigger inputs manufactured by onsemi in 14-SOIC surface mount packaging. This device is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The 74LCX14M operates across a 2V to 3.6V supply voltage range with Schmitt trigger functionality for noise immunity in digital logic applications.

Key Parameters

Parameter	Value
Logic Type	Inverter
Number of Circuits	6
Number of Inputs	1
Features	Schmitt Trigger
Voltage - Supply	2V ~ 3.6V
Current - Quiescent (Max)	10 µA
Current - Output High, Low	24mA, 24mA
Input Logic Level - Low	0.4V ~ 0.6V
Input Logic Level - High	1.7V ~ 2.2V
Max Propagation Delay @ 3.3V, 50pF	6.5ns
Operating Temperature	-40°C ~ 85°C
Package / Case	14-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the 74LCX14M is determined by the following critical parameters:

Logic configuration: 6-channel inverter with Schmitt trigger inputs
Package compatibility: 14-SOIC surface mount form factor
Supply voltage range: Minimum 2V operation capability
Output drive capability: 24mA high and low
Propagation delay: Maximum 6.5ns at 3.3V with 50pF load
Operating temperature range: Minimum -40°C to 85°C coverage
RoHS3 compliance and MSL Level 1 rating

Substitute parts are grouped into three categories based on product status and electrical characteristics:

Direct Substitutes (Same Series - 74LCX): Parts maintaining identical electrical specifications and 14-SOIC packaging from onsemi.

Cross-Manufacturer Equivalents (74LVC Series): Parts from Texas Instruments, Nexperia, and Diodes Incorporated offering enhanced specifications while maintaining functional compatibility within the 14-SOIC package.

Automotive-Grade Upgrades: AEC-Q100 qualified variants for applications requiring automotive reliability standards.

Parameter Comparison

Part Number	Manufacturer	Series	Status	Supply Voltage	Quiescent Current (Max)	Propagation Delay @ 3.3V, 50pF	Operating Temp	Package	Packaging Type
74LCX14M	onsemi	74LCX	Obsolete	2V ~ 3.6V	10 µA	6.5ns	-40°C ~ 85°C	14-SOIC	Tube
MC74LCX14DG	onsemi	74LCX	Active	2V ~ 3.6V	10 µA	6.5ns	-40°C ~ 85°C	14-SOIC	Tube
SN74LVC14AD	Texas Instruments	74LVC	Active	1.65V ~ 3.6V	1 µA	6.2ns	-40°C ~ 125°C	14-SOIC	Tube
SN74LVC14AQDREP	Texas Instruments	74LVC	Active	2V ~ 3.6V	10 µA	6.4ns	-40°C ~ 125°C	14-SOIC	Tape & Reel
SN74LVC14AQDRG4Q1	Texas Instruments	74LVC	Active	2V ~ 3.6V	10 µA	6.4ns	-40°C ~ 125°C	14-SOIC	Tape & Reel
SN74LVC14AQDRQ1	Texas Instruments	74LVC	Active	2V ~ 3.6V	10 µA	6.4ns	-40°C ~ 125°C	14-SOIC	Tape & Reel
74LVC14AD,118	Nexperia USA Inc.	74LVC	Active	1.2V ~ 3.6V	40 µA	6.4ns	-40°C ~ 125°C	14-SOIC	Tape & Reel
74LVC14AS14-13	Diodes Incorporated	74LVC	Active	1.65V ~ 5.5V	10 µA	4.8ns	-40°C ~ 125°C	14-SOIC	Tape & Reel
SN74LVC14ADR	Texas Instruments	74LVC	Active	1.65V ~ 3.6V	1 µA	6.2ns	-40°C ~ 125°C	14-SOIC	Cut Tape & Digi-Reel
SN74LVC14ADRG3	Texas Instruments	74LVC	Active	1.65V ~ 3.6V	1 µA	6.2ns	-40°C ~ 125°C	14-SOIC	Tape & Reel
SN74LVC14ADRG4	Texas Instruments	74LVC	Discontinued at DiGi Electronics	1.65V ~ 3.6V	1 µA	6.2ns	-40°C ~ 125°C	14-SOIC	Cut Tape & Digi-Reel

Engineering Selection Recommendations

Primary Recommendation - Direct Equivalent: MC74LCX14DG from onsemi maintains identical electrical specifications and 14-SOIC packaging as the 74LCX14M. This part is currently active and provides the most direct replacement path with no design modifications required.

Secondary Recommendation - Enhanced Performance: SN74LVC14AQDREP or SN74LVC14AQDRQ1 from Texas Instruments offer extended operating temperature range (-40°C to 125°C versus -40°C to 85°C) and improved quiescent current characteristics. These parts are suitable for applications requiring broader temperature coverage. The AQDRQ1 variant includes AEC-Q100 automotive qualification for applications requiring automotive-grade reliability.

Alternative for Extended Supply Range: 74LVC14AS14-13 from Diodes Incorporated supports an extended supply voltage range (1.65V to 5.5V) and delivers faster propagation delay (4.8ns at 3.3V, 50pF). This part is appropriate for designs requiring wider voltage tolerance or improved timing performance.

Packaging Consideration: All substitute parts maintain 14-SOIC surface mount packaging compatible with existing PCB layouts. Packaging variants (Tube, Tape & Reel, Cut Tape & Digi-Reel) affect procurement and assembly processes but do not impact electrical performance or board-level compatibility.

Compliance Status: All listed substitutes maintain ROHS3 compliance and MSL Level 1 rating, ensuring compatibility with standard manufacturing and storage requirements.

Frequently Asked Questions (FAQ)

Q: Can I directly replace 74LCX14M with MC74LCX14DG without design changes? A: Yes. MC74LCX14DG is functionally identical to 74LCX14M with matching electrical specifications, supply voltage range, and 14-SOIC packaging. No circuit modifications are required.

Q: What is the primary difference between 74LCX and 74LVC series parts? A: The 74LVC series from Texas Instruments, Nexperia, and Diodes offers extended operating temperature range (-40°C to 125°C) and lower quiescent current in some variants. Both series maintain Schmitt trigger functionality and 6-channel inverter configuration in 14-SOIC packaging.

Q: Are automotive-grade variants (SN74LVC14AQDRQ1, SN74LVC14AQDRG4Q1) compatible with standard industrial applications? A: Yes. Automotive-grade parts with AEC-Q100 qualification exceed standard industrial requirements and are fully compatible with non-automotive applications. They provide enhanced reliability margins.

Q: Does packaging type (Tube, Tape & Reel, Cut Tape) affect electrical performance? A: No. Packaging type affects only procurement, storage, and assembly processes. Electrical specifications and board-level performance remain identical across all packaging variants of the same part number.

Q: Which substitute offers the best propagation delay performance? A: 74LVC14AS14-13 from Diodes Incorporated delivers 4.8ns propagation delay at 3.3V with 50pF load, compared to 6.5ns for the original 74LCX14M. This represents approximately 26% faster switching performance.

Q: Can I use SN74LVC14AD in applications requiring the full 2V to 3.6V supply range? A: SN74LVC14AD supports 1.65V to 3.6V supply range, which covers the 2V to 3.6V requirement of the 74LCX14M. However, for designs operating below 1.65V, this part is not suitable.

Q: What is the inventory status of these substitute parts? A: MC74LCX14DG (2440 pcs), SN74LVC14AD (2460 pcs), SN74LVC14AQDREP (3400 pcs), SN74LVC14AQDRG4Q1 (3464 pcs), and SN74LVC14AQDRQ1 (2397 pcs) are all listed as new original stock. Availability should be confirmed with your component supplier.

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