STMicroelectronics 74VHC14TTR

Overview

74VHC14TTR from STMicroelectronics is a high-speed CMOS hex Schmitt trigger inverter with hysteresis, designed for noise-immune signal conditioning in digital interface and timing circuits. It operates from 2V to 5.5V, delivers 5.5ns typical propagation delay at 5V, supports ±8mA symmetrical output drive, and features input tolerance up to 7V independent of VCC - enabling robust 5V-to-3V level translation in mixed-voltage systems.

For engineers reviewing the 74VHC14TTR datasheet, 74VHC14TTR pinout, 74VHC14TTR application, or 74VHC14TTR equivalent, key selection criteria include hysteresis voltage (0.4–1.4V), input threshold symmetry (Vt+ = 1.75–3.85V / Vt− = 1.35–3.35V at 4.5V), power-down input protection, ESD immunity (2kV), and TSSOP-14 package compatibility with legacy 74-series footprints.

Technical Context

The 74VHC14TTR implements six independent Schmitt-trigger inverters using sub-micron C2MOS technology, with three-stage buffered outputs to ensure stable switching and high noise immunity. Its hysteresis (Vh = 0.4–1.4V at VCC = 4.5V) enables reliable operation on slow-rising/falling signals such as mechanical switch debouncing or noisy sensor inputs.

All inputs accept 0–7V regardless of VCC, providing inherent overvoltage tolerance and eliminating external clamping diodes. Output stages deliver symmetrical |IOH| = |IOL| ≥ 8mA at VCC = 4.5V, ensuring matched rise/fall times and balanced propagation delays (tPLH ≅ tPHL).

Key Specifications

Pinout & Package

TSSOP-14 package: 4.4mm × 5.0mm body, 0.65mm pitch, 14-pin surface-mount with exposed pad not present. RoHS-compliant, moisture sensitivity level MSL3.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LV14APWR and MC74VHC14DT, the 74VHC14TTR uniquely combines 7V input tolerance, TSSOP-14 compactness, and 5.5ns speed at 5V - making it optimal for space-constrained, mixed-voltage industrial control and automotive body electronics.

Availability

74VHC14TTR is available at Aetrix Electronics and suitable for pushbutton debouncing, waveform shaping, and level translation requiring stable component supply across automotive, industrial control, and consumer electronics production programs.

Supply support for 74VHC14TTR 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, digital, and mixed-signal ICs for automotive, industrial, and consumer markets.

The 74VHC series targets high-speed, low-power CMOS logic replacement for legacy 74-series devices, emphasizing interoperability, wide supply range, and enhanced robustness in real-world embedded systems.

FAQ

Can 74VHC14TTR operate with VCC = 2.5V?

Yes - the device is fully specified from 2V to 5.5V. At VCC = 2.5V, typical propagation delay increases to ~12ns, input thresholds scale proportionally (Vt+ ≈ 1.1V, Vt− ≈ 0.8V), and output drive drops to ≥4mA. All logic functions remain guaranteed across −55°C to +125°C.

Does 74VHC14TTR require external pull-up or pull-down resistors on unused inputs?

No - unused inputs may be left floating due to built-in input protection diodes and high-impedance CMOS structure. However, best practice is to tie them to VCC or GND to prevent noise coupling; the device's hysteresis and 2µA max ICC ensure negligible impact on power or signal integrity.

Is the 74VHC14TTR pin-compatible with standard 74HC14 in TSSOP-14?

Yes - pinout, function, and footprint match 74HC14TTR exactly. The 74VHC14TTR offers identical pin assignments and improved specifications: lower ICC (2µA vs. 4µA), tighter hysteresis control, and enhanced latch-up immunity - enabling drop-in replacement with measurable system-level benefits.

What is the maximum capacitive load the 74VHC14TTR can drive reliably?

The device is characterized up to 50pF load capacitance with guaranteed AC performance (tPLH/tPHL ≤ 10ns at 5V). Driving >50pF increases propagation delay nonlinearly and may cause ringing; for >100pF loads, add a series resistor (22–47Ω) near the output to dampen reflections and maintain signal integrity.