STMicroelectronics 74LVX14TTR

Overview

74LVX14TTR from STMicroelectronics is a low-voltage CMOS hex Schmitt trigger inverter with 5V-tolerant inputs, operating from 2V to 3.6V supply, delivering 6.8ns typical propagation delay at 3.3V, 1V typical hysteresis, and ±4mA symmetrical output drive-used for noise-immune signal conditioning in 3.3V/5V mixed-voltage interface circuits.

For engineers reviewing the 74LVX14TTR datasheet, 74LVX14TTR pinout, 74LVX14TTR application, or 74LVX14TTR equivalent, key selection criteria include input hysteresis width (1V typ), 5V-tolerant input voltage range (0–7V), symmetrical output drive (|IOH| = IOL ≥ 4mA), and power-down input protection enabling safe hot-insertion in battery-powered systems.

Technical Context

The 74LVX14 implements six independent Schmitt-trigger inverters using sub-micron C2MOS technology, each featuring asymmetric input thresholds (Vt+ ≈ 2.2V, Vt− ≈ 0.9V at VCC = 3.0V) to provide 1.3V nominal hysteresis-enabling reliable recovery from slow-rising/falling signals such as those from mechanical switches or long PCB traces.

All inputs tolerate 0–7V regardless of VCC state, supported by internal clamping diodes and power-down protection circuitry; outputs exhibit matched tPLH/tPHL propagation delays (≤1.0ns skew at 50pF load) and low dynamic noise (VOLP = 0.3V typ at 3.3V), critical for stable timing in mixed-signal embedded control nodes.

Key Specifications

Pinout & Package

TSSOP-14 package: 4.4mm × 5.0mm body, 0.65mm pitch, 1.05mm max height, lead-free and RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC14APWR and MC74VHC14DT, the 74LVX14TTR uniquely combines guaranteed 5V input tolerance at 3.3V VCC, sub-20µA quiescent current, and integrated power-down protection-making it the only choice for battery-powered, mixed-voltage, or hot-pluggable interfaces requiring robust noise immunity.

Availability

74LVX14TTR is available at Aetrix Electronics and suitable for industrial sensor interfaces, USB power control circuits, battery-powered wake-up systems, and mixed-voltage logic translation requiring stable component supply across extended temperature ranges (−55°C to +125°C).

Supply support for 74LVX14TTR 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, designing and manufacturing microcontrollers, power management ICs, sensors, and analog components for automotive, industrial, and consumer markets.

The 74LVX series targets low-voltage, low-power, and mixed-signal interface applications-specifically engineered to bridge 3.3V logic domains with legacy 5V systems while minimizing power and noise in portable and embedded designs.

FAQ

Can 74LVX14TTR be used with VCC = 2.5V?

Yes. The device is fully specified from 2.0V to 3.6V. At VCC = 2.5V, input thresholds scale proportionally (Vt+ ≈ 1.8V, Vt− ≈ 0.7V), hysteresis remains ~1.1V, and output drive meets ≥2.5mA (IOL/IOH min). Propagation delay increases to ~11ns (typ) at 2.5V/15pF, but functionality and noise immunity are preserved.

Does 74LVX14TTR require external pull-up or pull-down resistors on inputs?

No. Inputs have built-in high-impedance biasing and ESD protection. With no external signal applied, inputs float near VCC/2 due to internal structure-but Schmitt-trigger action prevents metastability. For deterministic idle-state behavior (e.g., default HIGH), a weak pull-up (≥100kΩ) to VCC is recommended, not required.

What is the maximum capacitive load the outputs can drive reliably?

The outputs are characterized up to 50pF (AC specs, Table 8). Driving >50pF increases propagation delay and may cause ringing due to trace inductance. For loads >50pF, add a series resistor (22–47Ω) near the driver output to dampen reflections-verified in ST's application note AN2015 for TSSOP-14 routing.

Is 74LVX14TTR pin-compatible with standard 74HC14 or 74LS14?

Pinout matches 74-series 14-pin DIP/SO/TSSOP packages (1A–6A inputs on odd pins, 1Y–6Y outputs on even pins, VCC=14, GND=7). However, electrical compatibility is limited: 74LVX14TTR has 5V-tolerant inputs and lower VCC range (2–3.6V) versus 74HC14 (2–6V) or 74LS14 (4.75–5.25V). Direct substitution requires verifying supply voltage and input signal levels.