STMicroelectronics 74V1T14CTR

Overview

74V1T14CTR from STMicroelectronics is a single Schmitt-trigger inverter in SOT323-5L package, operating from 4.5V to 5.5V, with 5.0ns typical propagation delay, 700mV typical hysteresis at 4.5V, and ±8mA symmetrical output drive. It interfaces 5V logic to slower or noisy signal lines in industrial control inputs and sensor signal conditioning.

For engineers reviewing the 74V1T14CTR datasheet, 74V1T14CTR pinout, 74V1T14CTR application, or 74V1T14CTR equivalent, this device is selected for noise-immune digital input conditioning where slow-rising signals, ESD-prone environments, or level-shifting between 3V/5V domains require robust threshold behavior and power-down input protection.

Technical Context

The 74V1T14CTR implements a three-stage CMOS buffer with Schmitt-trigger input stage, delivering hysteresis (Vt+ = 0.9–2.0V, Vt− = 0.5–1.6V) to reject noise on slow-transitioning signals. Its input accepts 0–7V regardless of VCC, enabling safe interfacing across voltage domains.

It features power-down protection: inputs remain high-impedance and non-damaging when VCC = 0V, and include ESD protection circuits rated to ±20mA diode current. Output stages provide matched |IOH| = |IOL| ≥ 8mA at 4.5V, ensuring balanced rise/fall times (tPLH ≅ tPHL).

Key Specifications

Pinout & Package

SOT323-5L: 5-pin ultra-small surface-mount package (1.80 × 2.40 mm body, 0.65 mm pitch), optimized for space-constrained PCB layouts in portable and industrial modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC1G14DBVR and NC7SZ14P5X, the 74V1T14CTR uniquely supports 0–7V input tolerance at 4.5–5.5V operation and power-down safety - making it optimal for industrial 5V backplanes, sensor front-ends, and legacy system upgrades where voltage margin and robustness outweigh raw speed.

Availability

74V1T14CTR is available at Aetrix Electronics and suitable for industrial control I/O modules, motor feedback interfaces, legacy system voltage translation, and low-power sensor node input conditioning requiring stable component supply and long-term manufacturability.

Supply support for 74V1T14CTR 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 74V series targets high-speed, low-power CMOS logic applications demanding robust noise immunity, wide supply tolerance, and compatibility with legacy 5V systems - especially in harsh or mixed-voltage environments.

FAQ

Can the 74V1T14CTR operate with VCC = 0V while accepting input signals?

Yes. Its input is protected during power-down: pins tolerate −0.5V to +7.0V regardless of VCC state. When VCC = 0V, the input remains high-impedance and non-damaging, and no output is driven - enabling safe hot-plug or partial-system power cycling without risk of latch-up or back-powering.

What is the maximum capacitive load the 74V1T14CTR can drive reliably?

The device is characterized up to 50pF load capacitance with tPLH/tPHL ≤11.5ns (max) at VCC = 5.0V. For loads exceeding 50pF, propagation delay increases linearly; design margin requires limiting trace + stub + receiver capacitance to ≤40pF for timing-critical 10MHz+ applications to maintain <10ns skew.

Does the 74V1T14CTR require external pull-up or pull-down resistors on unused pins?

Pin 1 (NC) has no internal connection and may be left floating or tied to GND/VCC per board layout convenience - no resistor required. All other pins (1A, 1Y, GND, VCC) must be connected as specified; leaving 1A unconnected risks noise-induced switching, so tie unused inputs to GND or VCC via ≥10kΩ resistor.

How does the hysteresis of the 74V1T14CTR improve performance in sensor signal conditioning?

Hysteresis (0.4–1.4V) prevents oscillation when input signals cross the threshold slowly or with noise. For example, an RC-filtered temperature sensor output rising over 10µs will trigger only once per transition - eliminating multiple false interrupts that would occur with a standard inverter, thereby improving measurement accuracy and reducing CPU load in polling or interrupt-driven firmware.