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

STMicroelectronics 74LCX14TTR

Name: 74LCX14TTR
Brand: STMicroelectronics
SKU: 74LCX14TTR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74LCX14TTR

Manufacturer:: STMicroelectronics

Category:: Gates and Inverters

Package:: 14-TSSOP (0.173", 4.40mm Width)

Datasheet:: 74LCX14TTR.pdf

Description:: IC INVERTER 6CH 1-INP 14TSSOP

Quantity:: RFQ Add To RFQ list

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Inventory:4,396

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Product details

Overview

74LCX14TTR from STMicroelectronics is a low-voltage CMOS hex Schmitt-trigger inverter with 5V-tolerant inputs, designed for noise-immune signal conditioning in 3.3V systems interfacing to 5V logic. It delivers t_PD ≤ 5.0 ns at V_CC = 3.0 V, ±24 mA output drive, 0.8 V typical hysteresis, and operates from 2.0 V to 3.6 V - enabling robust reception of slow-rising signals in industrial I/O and bus interface applications.

For engineers reviewing the 74LCX14TTR datasheet, 74LCX14TTR pinout, 74LCX14TTR application, or 74LCX14TTR equivalent, this page provides verified technical context, real-world design meaning of specifications, validated pin functions, application-specific use cases, and confirmed alternative parts with documented functional and application-level differences.

Technical Context

The 74LCX14TTR implements six independent Schmitt-trigger inverters using sub-micron C2MOS technology, providing hysteresis (V_H = 0.4–1.2 V) between positive (V_T+ = 1.2–2.2 V) and negative (V_T− = 0.6–1.5 V) input thresholds at V_CC = 3.0 V. Its symmetrical output impedance ensures |I_OH| = I_OL ≥ 24 mA under 3.0–3.6 V supply conditions.

It supports mixed-voltage system integration via 5V-tolerant inputs (VI up to 5.5 V) while operating at 2.0–3.6 V V_CC, and features power-down protection on all I/O pins plus ESD immunity >2000 V HBM. Propagation delays are balanced (t_PLH ≅ t_PHL) and skew is limited to ≤1.0 ns across outputs.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Operating Range	2.0 V to 3.6 V - enables direct use in 3.3V LVTTL/LVCMOS systems without level shifters
t_PD Max	5.0 ns at V_CC = 3.0 V, CL = 50 pF - supports >100 MHz signal conditioning in high-speed digital interfaces
Input Hysteresis (V_H)	0.4–1.2 V typical - rejects noise on slow-transitioning lines (e.g., mechanical switch debouncing, long traces)
I_OH/I_OL Min	±24 mA at V_CC = 3.0–3.6 V - drives multiple LVTTL loads or terminates stubs in point-to-point bus receivers
5V Input Tolerance	VI up to 5.5 V - allows direct connection to legacy 5V microcontrollers, sensors, or FPGA I/O banks
ESD Rating	HBM > 2000 V, MM > 200 V - meets industrial-grade handling requirements without external protection

Pinout & Package

TSSOP14 (Thin Shrink Small Outline Package, 14-lead), lead-free per ECOPACK®, 0.65 mm pitch, body dimensions 5.0 × 6.4 mm.

Pin/Terminal	Circuit Role	Design Meaning
1, 3, 5, 9, 11, 13 (1A–6A)	Input (Schmitt-trigger inverter stage)	Accepts 0–5.5 V signals; hysteresis prevents chatter on noisy or slow edges
2, 4, 6, 8, 10, 12 (1Y–6Y)	Output (inverted, buffered)	Drives LVTTL/LVCMOS loads with matched rise/fall times and ±24 mA sink/source capability
7	GND	Reference return for all I/O and internal logic; must be low-impedance for stable hysteresis and timing
14	V_CC	Primary supply (2.0–3.6 V); powers all six inverters and enables 5V-tolerant input structure

Key Features

Feature	Design Value
5V-tolerant inputs	Enables direct interfacing to 5V peripherals without external level translators or resistive dividers
Schmitt-trigger hysteresis	0.8 V typical threshold separation eliminates false triggering on slow or noisy signals (e.g., panel switches, sensor outputs)
Balanced propagation delays	t_PLH ≅ t_PHL ensures minimal duty-cycle distortion in clock or data inversion paths
Power-down I/O protection	Prevents back-driving and latch-up when V_CC = 0 V - safe for hot-swap or partial-power-down systems
PCI-bus compatible drive	Guaranteed ±24 mA output at 3.3 V meets PCI Local Bus specification for receiver driver strength

Applications

Industrial Pushbutton Interface

LVCMOS Clock Signal Conditioning

Use Scenario: Debouncing mechanical pushbuttons connected to a 3.3V microcontroller GPIO with long PCB traces.

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

Use Value: Eliminates contact bounce artifacts without software polling or RC filters, reducing firmware complexity and latency.

Use Scenario: Cleaning jittery or slow-rising clock signals from crystal oscillators or PLL outputs before distribution.

IC Role / Device Role / Timing Role: Hex inverter used as a buffer and waveform sharpening stage in clock tree fanout.

Use Value: Improves signal integrity by restoring fast edges and consistent thresholds, minimizing skew across multiple clock domains.

Legacy 5V Sensor Interface

Low-Power Bus Receiver

Use Scenario: Connecting 5V-output analog sensor modules (e.g., temperature, voltage monitors) to a 3.3V ADC controller.

IC Role / Device Role / Timing Role: Level-translating signal conditioner converting 5V logic swings to clean 3.3V-compatible inputs.

Use Value: Avoids discrete resistor dividers or dedicated level shifters, saving board space and ensuring deterministic timing.

Use Scenario: Receiving asynchronous control signals (e.g., enable, reset, interrupt) on a low-power embedded system bus.

IC Role / Device Role / Timing Role: Robust receiver front-end with hysteresis and strong drive for downstream logic fanout.

Use Value: Guarantees reliable signal capture even with ground bounce or crosstalk, improving system fault tolerance.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74LVC14APWR	Lower hysteresis (0.3–0.5 V typ), faster t_PD = 4.2 ns @ 3.3 V, but only 3.6 V max input tolerance	Not suitable for direct 5V input interfacing; requires external clamping or translation for 5V sources	Select when full 5V tolerance is unnecessary and minimal propagation delay is prioritized
MC74LCX14DT	Same electrical specs and pinout, but in SO-14 package (not TSSOP); identical hysteresis and drive strength	Preferred for through-hole prototyping or legacy PCBs with SOIC footprints; larger footprint than TSSOP	Select when board layout uses SOIC-14 land pattern or manual soldering is required

Compared with SN74LVC14APWR and MC74LCX14DT, the 74LCX14TTR uniquely combines guaranteed 5V input tolerance with 0.8 V hysteresis and TSSOP14 packaging - making it optimal for space-constrained, mixed-voltage industrial I/O where noise immunity and legacy compatibility are critical.

Availability

74LCX14TTR is available at Aetrix Electronics and suitable for industrial pushbutton interfaces, LVCMOS clock conditioning, legacy 5V sensor interfacing, and low-power bus receiver designs requiring stable component supply across extended temperature ranges (–40 °C to +85 °C).

Supply support for 74LCX14TTR 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in automotive, industrial, and power management ICs with a focus on energy efficiency and reliability.

The 74LCX series was developed for low-voltage, high-speed 3.3V logic interoperability - specifically targeting mixed-signal systems needing 5V-tolerant I/O, low power, and Schmitt-trigger noise immunity in industrial and telecom infrastructure.

FAQ

Is the 74LCX14TTR pin-compatible with standard 74HC14 or 74LS14?

Yes - it is pin- and function-compatible with the 74-series 14 (e.g., 74HC14, 74LS14) in TSSOP14 footprint, but operates at 2.0–3.6 V V_CC and features 5V-tolerant inputs. Unlike 74HC14, it does not require pull-up resistors for 5V inputs and offers higher drive strength (±24 mA vs. ±4 mA typical).

Can the 74LCX14TTR be used with V_CC = 2.5 V?

Yes - its recommended operating range is 2.0 V to 3.6 V. At V_CC = 2.5 V, output drive drops to ±12 mA (per datasheet Table 4), and propagation delay increases to ≤6.5 ns (Table 7), while maintaining full 5V input tolerance and Schmitt functionality.

Does the 74LCX14TTR support hot insertion or partial power-down?

Yes - all inputs and outputs feature power-down protection. When V_CC = 0 V, inputs and outputs remain high-impedance with no back-current path, preventing damage or bus contention during live insertion or system sleep states.

What is the maximum capacitive load the 74LCX14TTR can drive reliably?

The datasheet specifies AC performance up to 50 pF (CL = 50 pF, RL = 500 Ω). With proper PCB layout and decoupling, it reliably drives ≥50 pF loads; for >100 pF, output rise/fall times degrade and may require local buffering or series termination to maintain signal integrity.

74LCX14TTR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: 74LCX

Package/Case:: 14-TSSOP (0.173", 4.40mm Width)

Packaging:: Tape & Reel (TR)

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:: 0.6V

Input Logic Level - High:: 2.2V

Max Propagation Delay @ V, Max CL:: 5ns @ 3.3V, 50pF

Operating Temperature:: -40°C ~ 85°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 14-TSSOP

74LCX14TTR FAQ

1.How can I place an order for 74LCX14TTR through Aetrix?

Please submit a Request for Quotation (RFQ) for 74LCX14TTR 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 74LCX14TTR reliable?

The price and inventory of 74LCX14TTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LCX14TTR is usually 5 days.

3.What payment methods are accepted for 74LCX14TTR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LCX14TTR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 74LCX14TTR?

74LCX14TTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74LCX14TTR 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 74LCX14TTR?

For technical support, including 74LCX14TTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LCX14TTR requirements.

6.How does Aetrix verify that 74LCX14TTR is sourced from the original manufacturer or authorized distributors?

All 74LCX14TTR 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 74LCX14TTR meets industry standards.

7.What is the process for return or replacement of 74LCX14TTR?

All 74LCX14TTR units undergo pre-shipment inspection (PSI). If there is an issue with 74LCX14TTR, 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 74LCX14TTR part is unused and in its original packaging.

Return procedure for 74LCX14TTR:

1.Submit a request within 90 days.

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

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