STMicroelectronics 74V1G14STR

Overview

74V1G14STR from STMicroelectronics is a single high-speed CMOS Schmitt trigger inverter in SOT23-5L package, operating from 2V to 5.5V supply, delivering 4.3ns typical propagation delay at 5V, 1µA max quiescent current at 25°C, and 1V typical hysteresis at 4.5V - used for noise-immune signal conditioning in level-shifting interfaces between 5V and 3V logic domains.

For engineers reviewing the 74V1G14STR datasheet, 74V1G14STR pinout, 74V1G14STR application, or 74V1G14STR equivalent, key selection criteria include input hysteresis voltage (0.3–1.6V), symmetrical output drive (±8mA min), power-down input protection, ESD immunity, and compatibility with slow-rising clock or sensor signals in mixed-voltage systems.

Technical Context

The device implements a three-stage buffered Schmitt inverter architecture with internal hysteresis, enabling reliable switching on noisy or slowly transitioning inputs. Its input accepts 0–7V regardless of VCC, supporting robust level translation and hot-swap tolerant operation.

DC input protection includes diode clamps and ESD structures rated to ±20mA, while symmetrical output impedance ensures matched rise/fall times (tPLH ≅ tPHL) and stable driving into capacitive loads up to 50pF.

Key Specifications

Pinout & Package

SOT23-5L surface-mount package (3.0 × 1.75 × 1.3 mm), 5-pin configuration with exposed pad not electrically connected; pin 1 is NC (Not Connected), simplifying layout by eliminating routing conflict on dense PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC1G14DBVR and NC7SZ14P5X, the 74V1G14STR uniquely combines 7V input tolerance, −55°C to +125°C operation, and guaranteed hysteresis across full voltage range - making it the only choice for ruggedized mixed-voltage industrial control and automotive body electronics.

Availability

74V1G14STR is available at Aetrix Electronics and suitable for push-button debouncing, RC oscillator buffering, and 5V-to-3.3V level translation requiring stable component supply across automotive, industrial automation, and embedded instrumentation programs.

Supply support for 74V1G14STR 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 industrial, automotive, and consumer markets.

The 74V series targets high-speed, low-power logic applications requiring robust noise immunity and mixed-voltage interoperability in space-constrained embedded systems.

FAQ

Is pin 1 (NC) required to be left floating or can it be tied to GND/VCC?

Pin 1 is internally unconnected and must remain unconnected in both schematic and layout. Tying it to GND or VCC introduces no functional benefit and risks unintended parasitic coupling or solder bridging in fine-pitch assembly. STMicroelectronics explicitly states "NC" with no alternate function or recommendation for termination.

Can the 74V1G14STR drive a 50pF load at 10MHz without waveform degradation?

Yes - AC characterization confirms t_PLH/t_PHL ≤ 9.5ns (max) at 5V, 50pF, and −40°C to +85°C. With matched output drive (±8mA), rise/fall times remain under 3ns, preserving signal integrity and setup/hold margins for downstream 74LVC or ARM GPIO inputs at that frequency.

Does the hysteresis voltage vary with temperature, and is it specified over full operating range?

Yes - hysteresis is characterized from −55°C to +125°C: V_h = 0.5V to 1.6V at V_CC = 5.5V, and 0.3V to 1.2V at V_CC = 3.0V. This monotonic increase with V_CC and moderate decrease with temperature ensures consistent noise margin across automotive and industrial thermal profiles.

What is the maximum input frequency for reliable Schmitt-trigger operation with slow edges?

There is no fixed maximum frequency - functionality depends on input slew rate, not periodicity. The device reliably squares up edges with rise/fall times up to 10µs (e.g., thermistor-based timing circuits), provided input voltage crosses V_t+/V_t− thresholds. Propagation delay remains constant regardless of edge speed.