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Home > Products > Integrated Circuits (ICs) > Logic > Gates and Inverters

onsemi MC74LCX14D

Name: MC74LCX14D
Brand: onsemi
SKU: MC74LCX14D
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MC74LCX14D

Manufacturer:: onsemi

Category:: Gates and Inverters

Package:: 14-SOIC (0.154", 3.90mm Width)

Datasheet:: MC74LCX14D.pdf

Description:: IC INVERT SCHMITT 6CH 1IN 14SOIC

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Product details

Overview

MC74LCX14D from onsemi is a low-voltage CMOS hex Schmitt-trigger inverter operating from 1.65 V to 5.5 V, featuring 5.0 V-tolerant inputs, 24 mA balanced output drive, and hysteresis (V_H = 0.7–1.7 V) for noise immunity. It serves as a robust line receiver in mixed-voltage digital interfaces, such as level-shifting between 3.3 V logic and legacy 5 V TTL systems.

For engineers reviewing the MC74LCX14D datasheet, pinout, applications, or equivalent options, key selection criteria include input hysteresis voltage, 5 V-tolerant input rating, propagation delay (≤5.6 ns at 5 V), supply current (≤10 µA), and TSSOP-14 package compatibility with high-density PCB layouts.

Technical Context

The MC74LCX14D implements six independent Schmitt-trigger inverters in a single monolithic IC, each with asymmetric input thresholds (V_T+ = 0.9–3.6 V, V_T− = 0.2–1.2 V depending on V_CC) to reject slow-rising or noisy signals. Its 5.5 V absolute maximum input voltage rating enables direct interfacing with 5 V TTL outputs without external level shifters.

It operates across −40 °C to +125 °C with near-zero static ICC (≤10 µA), supports 24 mA sink/source per output, and exhibits low dynamic switching noise (V_OLP = 0.6 V, V_OLV = −0.6 V at 3.3 V/50 pF). Input capacitance is 7 pF and power dissipation capacitance is 25 pF.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	1.65 V to 5.5 V - Enables operation across 1.8 V, 2.5 V, 3.3 V, and 5 V logic domains without level translation.
Input Hysteresis (V_H)	0.7 V to 1.7 V - Provides noise margin against EMI and slow-edge signals; critical for reliable signal reception in industrial environments.
5 V-Tolerant Inputs	VI up to 5.5 V - Allows direct connection to 5 V TTL outputs while powered from lower V_CC, eliminating external clamping diodes.
t_PLH/t_PHL	≤5.6 ns at V_CC = 4.5–5.5 V - Supports high-speed signal conditioning in clock distribution and data recovery paths.
I_OH/I_OL	±24 mA - Drives standard LVTTL/LVCMOS loads and short traces without buffering; sufficient for fan-out of ≥10.
I_IN Leakage	±5.0 µA max - Minimizes loading on upstream drivers, preserving signal integrity in high-impedance sensor or microcontroller I/O lines.
Package	TSSOP-14 (Case 948G) - 5.0 mm × 4.4 mm footprint with 0.65 mm pitch; optimized for automated assembly and thermal performance (θ_JA = 150 °C/W).

Pinout & Package

TSSOP-14 package (Case 948G), 5.0 mm × 4.4 mm body, 0.65 mm lead pitch, Pb-free, RoHS compliant.

Pin/Terminal	Circuit Role	Design Meaning
1, 3, 5, 9, 11, 13	Input (A1–A6)	Schmitt-trigger inputs with hysteresis; accept 0–5.5 V, compatible with 5 V TTL while V_CC ≥ 1.65 V.
2, 4, 6, 8, 10, 12	Output (Y1–Y6)	Inverted outputs with 24 mA sink/source; rail-to-rail swing (V_OH ≥ V_CC − 0.1 V, V_OL ≤ 0.6 V at 24 mA).
7	GND	Ground reference for all inputs, outputs, and internal circuitry; must be low-impedance for noise immunity.
14	V_CC	Positive supply (1.65–5.5 V); powers all six inverters and defines logic thresholds and output levels.

Key Features

Feature	Design Value
Schmitt-trigger inputs with programmable hysteresis	Hysteresis voltage scales with V_CC (0.1–1.7 V), enabling reliable edge detection on slow or noisy signals like reset lines or mechanical switch debouncing.
5.0 V-tolerant inputs on 1.65–5.5 V supply	Eliminates need for external level translators when interfacing with legacy 5 V logic, reducing BOM count and board space.
24 mA balanced output drive	Supports direct driving of multiple LVTTL loads or moderate capacitive loads (<100 pF) without signal degradation.
Ultra-low quiescent current (≤10 µA)	Reduces system standby power consumption-critical for battery-powered IoT nodes and always-on monitoring circuits.
Latch-up immunity >100 mA	Ensures robustness against transient overvoltage events and ESD-induced latch-up in harsh industrial settings.

Applications

Industrial Sensor Interface	Microcontroller I/O Expansion
Use Scenario: Conditioning slow-rising analog comparator outputs or mechanical switch signals in PLC input modules. IC Role / Device Role / Timing Role: Schmitt-trigger inverter acting as noise-immune signal conditioner and digital buffer. Use Value: Converts marginal edges into clean logic transitions; hysteresis rejects contact bounce and EMI without software debouncing.	Use Scenario: Extending GPIO count of an ARM Cortex-M0+ MCU by adding six independent inverted control lines. IC Role / Device Role / Timing Role: Logic-level translator and signal inverter for peripheral enable/disable lines. Use Value: 5 V-tolerant inputs allow direct connection to 5 V peripherals; 24 mA drive ensures reliable activation of optocouplers or relay drivers.
Legacy System Integration	Low-Power Clock Buffering
Use Scenario: Interfacing modern 3.3 V FPGA I/O banks with legacy 5 V industrial bus transceivers. IC Role / Device Role / Timing Role: Voltage-level translator and signal inverter for bidirectional control lines. Use Value: Eliminates discrete resistor-divider networks; VI = 5.5 V rating prevents damage during hot-swap or power sequencing mismatches.	Use Scenario: Squaring up jittery crystal oscillator outputs or RC-generated clocks in portable medical devices. IC Role / Device Role / Timing Role: Schmitt-trigger clock buffer providing clean, fast-rise/fall timing signals. Use Value: Propagation delay ≤5.6 ns and low dynamic noise (V_OLP = 0.6 V) preserve timing margins in sub-100 MHz clock trees.

Industrial Sensor Interface

Microcontroller I/O Expansion

Use Scenario: Conditioning slow-rising analog comparator outputs or mechanical switch signals in PLC input modules.

IC Role / Device Role / Timing Role: Schmitt-trigger inverter acting as noise-immune signal conditioner and digital buffer.

Use Value: Converts marginal edges into clean logic transitions; hysteresis rejects contact bounce and EMI without software debouncing.

Use Scenario: Extending GPIO count of an ARM Cortex-M0+ MCU by adding six independent inverted control lines.

IC Role / Device Role / Timing Role: Logic-level translator and signal inverter for peripheral enable/disable lines.

Use Value: 5 V-tolerant inputs allow direct connection to 5 V peripherals; 24 mA drive ensures reliable activation of optocouplers or relay drivers.

Legacy System Integration

Low-Power Clock Buffering

Use Scenario: Interfacing modern 3.3 V FPGA I/O banks with legacy 5 V industrial bus transceivers.

IC Role / Device Role / Timing Role: Voltage-level translator and signal inverter for bidirectional control lines.

Use Value: Eliminates discrete resistor-divider networks; VI = 5.5 V rating prevents damage during hot-swap or power sequencing mismatches.

Use Scenario: Squaring up jittery crystal oscillator outputs or RC-generated clocks in portable medical devices.

IC Role / Device Role / Timing Role: Schmitt-trigger clock buffer providing clean, fast-rise/fall timing signals.

Use Value: Propagation delay ≤5.6 ns and low dynamic noise (V_OLP = 0.6 V) preserve timing margins in sub-100 MHz clock trees.

Equivalent & Alternatives

The following parts are listed as comparable options for similar hex Schmitt-trigger inverter applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74LVC14APWR	Lower V_CC min (1.65 V same), but only 2.5 V tolerant inputs (not 5 V); t_PD = 5.5 ns typical at 3.3 V.	Not suitable for direct 5 V input interfacing; requires external clamping if used with 5 V sources.	Select when full 5 V tolerance is unnecessary and cost or availability favors TI's offering.
74LVC14AD,118	Same 5 V-tolerant inputs and 24 mA drive; slightly higher max ICC (20 µA vs. 10 µA); identical TSSOP-14 package.	Functionally interchangeable in most designs; minor quiescent current difference matters only in ultra-low-power sleep modes.	Preferred where NXP sourcing or long-term availability is prioritized over minimal ICC reduction.

Compared with SN74LVC14APWR and 74LVC14AD,118, the MC74LCX14D uniquely guarantees 5.5 V input tolerance across its full 1.65–5.5 V supply range-enabling drop-in use in mixed-voltage systems without redesign, while maintaining lower static current and proven latch-up immunity.

Availability

MC74LCX14D is available at Aetrix Electronics and suitable for industrial sensor interface, microcontroller I/O expansion, and legacy system integration requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.

Supply support for MC74LCX14D includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

onsemi (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power management, analog, logic, and sensing solutions for automotive, industrial, and cloud infrastructure markets.

The MC74LCX14D belongs to the LCX low-voltage CMOS logic family, designed specifically for mixed-supply systems requiring robust 5 V-tolerant interfacing, low power, and high noise immunity in space-constrained industrial and communications equipment.

FAQ

What is the maximum input voltage rating for MC74LCX14D?

The MC74LCX14D supports DC input voltages up to 5.5 V regardless of V_CC level, enabling safe interfacing with 5 V TTL outputs even when powered from 1.8 V or 3.3 V supplies. This rating is verified per Absolute Maximum Ratings table in the official datasheet (Rev. 9, Feb 2024), and applies to all six inputs (A1–A6) simultaneously.

Does MC74LCX14D require external pull-up or pull-down resistors on unused inputs?

Yes - per datasheet Section 4 (Recommended Operating Conditions), all unused inputs of the MC74LCX14D must be tied to a defined logic level (either GND or V_CC) to prevent floating states that could cause excessive current draw or erratic output behavior. Leaving inputs unconnected violates functional reliability requirements.

What is the typical propagation delay of MC74LCX14D at 3.3 V supply?

At V_CC = 3.3 V and T_A = −40 °C to +85 °C, the MC74LCX14D exhibits t_PLH/t_PHL ≤ 6.5 ns (max), with typical values around 4.5 ns. This is specified in the AC Electrical Characteristics table (page 5) under "Propagation Delay, Input to Output" for 3.0–3.6 V range.

Is MC74LCX14D pin-compatible with standard hex inverters like MC74LCX04?

Yes - the MC74LCX14D shares identical pin configuration and function with the MC74LCX04 (non-Schmitt version), as confirmed in the datasheet introduction: "Pin configuration and function are the same as the MC74LCX04, but the inputs have hysteresis." Both use TSSOP-14 or SOIC-14 footprints with matching A1–A6/Y1–Y6/GND/V_CC assignments.

What thermal resistance does the TSSOP-14 package of MC74LCX14D exhibit?

The TSSOP-14 package (Case 948G) for MC74LCX14D has a junction-to-ambient thermal resistance (θ_JA) of 150 °C/W, measured per JESD51-7 on an FR4 board with 2-ounce copper. This value is listed in the Maximum Ratings table (page 3) and informs thermal design for continuous operation up to +125 °C ambient.

MC74LCX14D Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: 74LCX

Package/Case:: 14-SOIC (0.154", 3.90mm Width)

Packaging:: Tube

Product Status:: Obsolete

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 @ V, Max CL:: 6.5ns @ 3.3V, 50pF

Operating Temperature:: -40°C ~ 85°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 14-SOIC

MC74LCX14D FAQ

1.How can I place an order for MC74LCX14D through Aetrix?

Please submit a Request for Quotation (RFQ) for MC74LCX14D on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for MC74LCX14D reliable?

The price and inventory of MC74LCX14D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC74LCX14D is usually 5 days.

3.What payment methods are accepted for MC74LCX14D?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC74LCX14D transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MC74LCX14D?

MC74LCX14D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MC74LCX14D order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for MC74LCX14D?

For technical support, including MC74LCX14D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC74LCX14D requirements.

6.How does Aetrix verify that MC74LCX14D is sourced from the original manufacturer or authorized distributors?

All MC74LCX14D products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MC74LCX14D meets industry standards.

7.What is the process for return or replacement of MC74LCX14D?

All MC74LCX14D units undergo pre-shipment inspection (PSI). If there is an issue with MC74LCX14D, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The MC74LCX14D part is unused and in its original packaging.

Return procedure for MC74LCX14D:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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