74LCX14MTC Equivalent & Substitute Parts

Part Overview

The 74LCX14MTC is a 6-channel inverter IC with Schmitt trigger inputs manufactured by onsemi in a 14-TSSOP surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The 74LCX14MTC operates across a 2V to 3.6V supply voltage range with low quiescent current and Schmitt trigger input conditioning suitable for logic signal inversion 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-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the 74LCX14MTC is determined by the following critical parameters:

Functional Equivalence: Logic type (inverter), number of circuits (6), number of inputs (1), and Schmitt trigger feature must match exactly.

Electrical Compatibility: Supply voltage range, quiescent current, output drive current, input logic levels, and propagation delay determine functional interchangeability within the same application.

Package Compatibility: The 14-TSSOP package footprint is the primary mechanical constraint. Substitutes in alternative packages (14-SSOP, 14-TVSOP) require PCB layout modification.

Product Status: Active parts are preferred over obsolete parts for new designs and long-term availability. Automotive-grade variants (AEC-Q100) provide additional qualification for demanding applications.

Compliance: RoHS3 compliance and MSL rating must be maintained for manufacturing and environmental requirements.

Substitute parts are grouped into three categories based on substitution type: parametric equivalent (identical electrical and package specifications), direct manufacturer alternative (same base series with compatible parameters), and upgrade variants (enhanced specifications or automotive qualification).

Parameter Comparison

Part Number	Manufacturer	Series	Supply Voltage	Quiescent Current (Max)	Propagation Delay @ 3.3V, 50pF	Operating Temp	Package	Product Status	Grade
74LCX14MTC	onsemi	74LCX	2V ~ 3.6V	10 µA	6.5ns	-40°C ~ 85°C	14-TSSOP	Obsolete	Standard
MC74LCX14DTG	onsemi	74LCX	2V ~ 3.6V	10 µA	6.5ns	-40°C ~ 85°C	14-TSSOP	Active	Standard
74LVC14AT14-13	Diodes Incorporated	74LVC	1.65V ~ 5.5V	10 µA	4.8ns	-40°C ~ 125°C	14-TSSOP	Active	Standard
SN74LVC14AQPWREP	Texas Instruments	74LVC	2V ~ 3.6V	10 µA	6.4ns	-40°C ~ 125°C	14-TSSOP	Active	Standard
SN74LVC14AQPWRG4Q1	Texas Instruments	74LVC	2V ~ 3.6V	10 µA	6.4ns	-40°C ~ 125°C	14-TSSOP	Active	Automotive (AEC-Q100)
SN74LVC14AQPWRQ1	Texas Instruments	74LVC	2V ~ 3.6V	10 µA	6.4ns	-40°C ~ 125°C	14-TSSOP	Active	Automotive (AEC-Q100)
74LVC14APW,118	NXP Semiconductors	74LVC	1.2V ~ 3.6V	40 µA	8ns @ 3.3V, 50pF	-40°C ~ 125°C	14-TSSOP	Active	Standard
SN74LVC14ADBR	Texas Instruments	74LVC	1.65V ~ 3.6V	1 µA	6.2ns	-40°C ~ 125°C	14-SSOP	Active	Standard
SN74LVC14ADGVR	Texas Instruments	74LVC	1.65V ~ 3.6V	1 µA	6.2ns	-40°C ~ 125°C	14-TVSOP	Active	Standard
SN74LVC14APW	Texas Instruments	74LVC	1.65V ~ 3.6V	1 µA	6.2ns	-40°C ~ 125°C	14-TSSOP	Active	Standard

Engineering Selection Recommendations

Parametric Equivalent (Direct Replacement): MC74LCX14DTG from onsemi is the parametric equivalent to 74LCX14MTC. It maintains identical electrical specifications and 14-TSSOP packaging. This part is active and suitable for direct substitution without design modification.

Direct Manufacturer Alternative (Same Supply Voltage): SN74LVC14AQPWREP and SN74LVC14AQPWRQ1 from Texas Instruments maintain the 2V to 3.6V supply voltage range matching the original part. Both are active and available in 14-TSSOP packaging. The automotive-qualified variants (AEC-Q100) provide additional qualification for applications requiring automotive-grade components.

Extended Voltage Range Alternative: 74LVC14AT14-13 from Diodes Incorporated and 74LVC14APW,118 from NXP Semiconductors offer extended supply voltage ranges (1.65V ~ 5.5V and 1.2V ~ 3.6V respectively) and improved propagation delay performance. These parts are active and available in 14-TSSOP packaging, suitable for applications requiring broader voltage compatibility.

Alternative Package Options: SN74LVC14ADBR (14-SSOP) and SN74LVC14ADGVR (14-TVSOP) provide functional equivalence with different package footprints. These require PCB layout modification but offer lower quiescent current (1 µA) and extended operating temperature range (-40°C ~ 125°C).

Selection Criteria: For direct PCB replacement without layout changes, select MC74LCX14DTG or parts in 14-TSSOP packaging. For automotive applications, select AEC-Q100 qualified variants. For extended voltage range or improved performance, select 74LVC14AT14-13 or SN74LVC14APW variants. All recommended substitutes maintain RoHS3 compliance and MSL 1 rating.

Frequently Asked Questions (FAQ)

Q: Can MC74LCX14DTG directly replace 74LCX14MTC without PCB modification? A: Yes. MC74LCX14DTG is a parametric equivalent with identical electrical specifications and 14-TSSOP package footprint. No PCB layout changes are required.

Q: What is the difference between 74LCX and 74LVC series? A: The 74LCX series operates at 2V to 3.6V supply voltage. The 74LVC series typically supports extended voltage ranges (1.65V to 5.5V). Both are inverter logic families with Schmitt trigger inputs. Substitution between series is possible when supply voltage compatibility is verified.

Q: Are automotive-qualified parts (AEC-Q100) compatible with standard applications? A: Yes. Automotive-qualified parts meet or exceed standard specifications and are fully compatible with standard applications. They provide additional qualification for demanding environments.

Q: Why do some substitutes have different package designations (14-SSOP vs 14-TSSOP)? A: Package designations indicate physical dimensions and pin spacing. 14-TSSOP (0.173" width) and 14-SSOP (0.209" width) have different footprints. Substitution between packages requires PCB layout modification and cannot be performed as direct pin-for-pin replacement.

Q: What does MSL 1 (Unlimited) mean? A: MSL 1 indicates Moisture Sensitivity Level 1, meaning the component has unlimited shelf life and does not require special moisture control during storage or handling.

Q: Can I use a part with lower quiescent current than the original? A: Yes. Lower quiescent current (1 µA vs 10 µA) is a performance improvement and does not create compatibility issues. The part will consume less standby power.

Q: What is the significance of propagation delay differences (6.5ns vs 4.8ns)? A: Propagation delay is the time required for a logic signal to transition through the inverter. Lower propagation delay (faster response) is generally beneficial and does not create compatibility issues in most applications. Verify timing requirements for critical applications.

Q: Are all recommended substitutes RoHS3 compliant? A: Yes. All recommended substitutes maintain RoHS3 compliance, meeting environmental and regulatory requirements equivalent to the original part.

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