STMicroelectronics 74LX1G14CTR

Overview

74LX1G14CTR from STMicroelectronics is a low-voltage CMOS single Schmitt trigger inverter with 5V-tolerant inputs, operating from 1.65 V to 5.5 V, delivering 7.5 ns max propagation delay at 3 V, ±24 mA output drive, and 1 µA max quiescent current - used for noise-immune signal conditioning in mixed-voltage interface circuits.

For engineers reviewing the 74LX1G14CTR datasheet, 74LX1G14CTR pinout, 74LX1G14CTR application, or 74LX1G14CTR equivalent, key selection criteria include hysteresis voltage (0.56–0.87 V at VCC = 3 V), input tolerance up to 7 V regardless of supply, symmetrical output impedance, power-down protection, and SOT323-5L package compatibility with space-constrained PCB layouts.

Technical Context

The device implements a three-stage buffered Schmitt inverter architecture, providing stable switching thresholds (VT+ = 1.50 V, VT− = 0.84 V at VCC = 3 V) and 0.66 V typical hysteresis to reject slow-rising or noisy signals. Its input protection circuitry enables ESD immunity and supports 0–7 V input voltages independent of VCC.

It features rail-to-rail output swing, balanced tPLH/tPHL propagation delays (≤7.5 ns), and operates across −55 °C to +125 °C. Power-down protection ensures safe I/O behavior when VCC = 0 V, allowing hot-plug and partial-power-down system use cases.

Key Specifications

Pinout & Package

SOT323-5L package: 1.80 × 2.20 mm body, 0.65 mm pitch, 5-terminal surface-mount outline with exposed pad not present. Pin 1 is NC (Not Connected); Pin 2 is input (1A); Pin 3 is GND; Pin 4 is output (1Y); Pin 5 is VCC.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC1G14DBVR and NC7WZ14P6X, the 74LX1G14CTR uniquely combines 5 V input tolerance, 24 mA drive, and sub-µA quiescent current in SOT323-5L - making it optimal for compact, mixed-voltage, low-power signal conditioning where robustness and footprint efficiency are critical.

Availability

74LX1G14CTR is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive body control modules, and IoT edge node wake-up circuits requiring stable component supply and long-term lifecycle support.

Supply support for 74LX1G14CTR 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, designing and manufacturing microcontrollers, power ICs, sensors, and discrete components for industrial, automotive, and consumer markets.

The 74LX series targets low-voltage, high-noise-immunity logic applications - specifically engineered for mixed-supply systems needing robust signal integrity, wide VCC range, and ultra-low power consumption.

FAQ

What is the maximum input voltage the 74LX1G14CTR can safely accept?

The 74LX1G14CTR accepts DC input voltages from −0.5 V to +7.0 V regardless of VCC level, verified per Absolute Maximum Ratings. This enables direct connection to 5 V buses in 3.3 V systems without external protection, provided current-limiting resistors are used if driving from high-impedance sources above VCC + 0.5 V.

Does the 74LX1G14CTR require external pull-up or pull-down resistors on its input?

No - the device has no internal pull resistors, but its Schmitt-trigger input provides inherent noise immunity without external biasing. Pull resistors are only needed if the source is high-impedance and may float during power-up or reset; otherwise, direct connection to active drivers is sufficient and recommended.

Can the 74LX1G14CTR operate with VCC = 0 V while signals are applied to its inputs or outputs?

Yes - power-down protection ensures safe I/O behavior when VCC = 0 V. Inputs and outputs are high-impedance and clamped, allowing hot-plug operation and partial power-down modes. However, output states are undefined during VCC = 0 V, so downstream logic must tolerate floating inputs.

How does the hysteresis of the 74LX1G14CTR compare to standard inverters in noise rejection?

At VCC = 3 V, the 74LX1G14CTR provides 0.56–0.87 V hysteresis (VT+ − VT−), versus zero hysteresis in standard inverters. This creates a guaranteed noise margin - e.g., a 0.6 V glitch superimposed on a rising edge will not cause false triggering, unlike non-Schmitt devices that switch unpredictably near threshold.