STMicroelectronics 74V1T14STR

Overview

74V1T14STR from STMicroelectronics is a single Schmitt-trigger inverter IC designed for noise-immune signal conditioning in 5V digital systems. It features 5.0 ns typical propagation delay at 5V, ±8 mA symmetrical output drive, 0.4–1.6 V hysteresis, and operates across 4.5–5.5 V supply with 1 µA max quiescent current. It interfaces 5V logic to slower or noisy inputs-e.g., mechanical switch debouncing in industrial control panels.

For engineers reviewing the 74V1T14STR datasheet, 74V1T14STR pinout, 74V1T14STR application, or 74V1T14STR equivalent, key selection criteria include input hysteresis width (Vh), rail-to-rail input tolerance (0–7 V), symmetrical output drive strength, power-down input protection, and SOT23-5L package compatibility with high-density PCB layouts.

Technical Context

The device implements a three-stage CMOS buffer architecture with integrated Schmitt-trigger input, delivering stable switching despite slow-rising/falling signals. Its input accepts voltages up to 7 V independent of VCC, enabling robust level translation between 3V and 5V domains without external clamping.

Internal ESD protection circuits provide immunity against static discharge, while sub-micron C2MOS fabrication ensures latch-up immunity and low ICC. Propagation delays tPLH and tPHL are balanced (≈5.0 ns typ.), minimizing duty-cycle distortion in clocked or timing-critical paths.

Key Specifications

Pinout & Package

SOT23-5L surface-mount package: 5-pin, 1.25 mm pitch, 2.8 × 2.9 mm body, 1.1 mm height, tape-and-reel delivery (74V1T14STR).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC1G14DBVR and MC74VHC1GT14DTT1G, the 74V1T14STR delivers superior noise margin on 5V lines due to its wider hysteresis and 0–7V input tolerance, making it optimal for industrial I/O where signal integrity is compromised by long traces or EMI.

Availability

74V1T14STR is available at Aetrix Electronics and suitable for industrial control panels, sensor interface modules, and embedded communication gateways requiring stable component supply across extended temperature ranges (–55°C to +125°C).

Supply support for 74V1T14STR 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 analog, MCU, power, and sensing solutions for automotive, industrial, and consumer markets.

The 74V series targets high-speed, low-power 5V logic applications with enhanced robustness-specifically engineered for noise-prone environments like factory automation and motor control I/O.

FAQ

Can 74V1T14STR operate with V_CC = 3.3V?

No. The 74V1T14STR is specified only for 4.5–5.5 V operation per Recommended Operating Conditions. At 3.3 V, thresholds and output drive fall outside guaranteed limits; use SN74LVC1G14 or MC74VHC1GT14 instead for 3.3 V systems.

What is the maximum input voltage if V_CC is unpowered?

When V_CC = 0 V, the input (Pin 2) remains protected up to 7 V due to built-in power-down circuitry. This prevents back-current flow and avoids damage or unintended logic states during partial power-down sequences.

Is Pin 1 (NC) required to be grounded?

No. Pin 1 is internally unconnected and may be left floating. However, grounding it improves mechanical stability and reduces parasitic antenna effects in high-frequency layouts-recommended but not electrically required.

How does hysteresis vary with temperature?

Hysteresis (V_H) remains stable across –55°C to +125°C: 0.4–1.4 V at 4.5 V supply and 0.5–1.6 V at 5.5 V supply, per DC specifications table. No derating is needed for industrial thermal cycling.