STMicroelectronics 74VHC14MTR

Overview

74VHC14MTR from STMicroelectronics is a high-speed CMOS hex Schmitt trigger inverter with 5.5 ns typical propagation delay at 5 V, 2 µA max quiescent current at 25°C, and 1 V typical hysteresis at 4.5 V. It operates from 2 V to 5.5 V, features input overvoltage tolerance up to 7 V, and is used for noise-immune signal conditioning in digital interface circuits.

For engineers reviewing the 74VHC14MTR datasheet, 74VHC14MTR pinout, 74VHC14MTR application, or 74VHC14MTR equivalent, key selection criteria include hysteresis voltage (0.3–1.6 V), symmetrical output drive (±8 mA), power-down input protection, ESD immunity (2 kV), and compatibility with 74-series logic families.

Technical Context

The 74VHC14 implements six independent Schmitt-trigger inverters using sub-micron C2MOS technology, with three-stage buffered outputs enabling stable switching and high noise immunity. Each gate accepts input voltages from 0 to 7 V regardless of VCC, supporting mixed-voltage interfacing (e.g., 5 V-to-3 V).

Its hysteresis-defined by V_t+ (1.2–3.85 V) and V_t− (0.9–3.35 V) thresholds-ensures clean edge regeneration on slow-rising/falling signals. Propagation delays are balanced (t_PLH ≅ t_PHL) and specified under controlled AC conditions (C_L = 15/50 pF, f_IN = 1 MHz).

Key Specifications

Pinout & Package

74VHC14MTR is supplied in a 14-pin SOIC (Small Outline Integrated Circuit) package with 1.27 mm pitch, compliant with JEDEC MS-012. Dimensions: 8.75 × 6.2 mm body, 1.75 mm height.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LV14APWR and MC74VHC14DT, the 74VHC14MTR uniquely supports 0–7 V inputs at any VCC within 2–5.5 V, making it the only choice for mixed-voltage bus interfacing where input overvoltage is unavoidable.

Availability

74VHC14MTR is available at Aetrix Electronics and suitable for industrial sensor interfaces, microcontroller reset circuits, RS-232 receivers, and crystal oscillator buffers requiring stable component supply across extended temperature ranges (−55°C to +125°C).

Supply support for 74VHC14MTR 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 analog, digital, and mixed-signal ICs for automotive, industrial, and consumer markets.

The 74VHC14 belongs to ST's high-speed CMOS logic family, engineered specifically for noise-immune digital signal conditioning in harsh environments and mixed-voltage systems.

FAQ

Can 74VHC14MTR operate with VCC = 3.3 V and accept 5 V inputs?

Yes. The device supports VCC from 2 V to 5.5 V and tolerates input voltages from 0 V to 7 V regardless of supply voltage. At VCC = 3.3 V, inputs up to 5 V are safely accepted without damage or logic corruption due to internal clamping and power-down protection.

What is the minimum load capacitance for guaranteed AC performance?

The AC specifications (e.g., tPLH/tPHL = 5.5 ns) are guaranteed with CL = 15 pF and CL = 50 pF test conditions. No minimum load is specified; the device functions correctly with open-drain or light capacitive loads (<5 pF), though propagation delay increases slightly below 15 pF.

Does 74VHC14MTR require external pull-up or pull-down resistors on unused inputs?

No. Unused inputs may be left floating only if the system guarantees they remain within valid logic thresholds (0–VCC). However, best practice is to tie unused inputs to VCC or GND via 1–10 kΩ resistors to prevent oscillation, noise coupling, or increased ICC due to intermediate input states.

How does the hysteresis voltage vary with supply voltage?

Hysteresis (Vh = Vt+ − Vt−) scales with VCC: 0.3–1.2 V at 3.0 V, 0.4–1.4 V at 4.5 V, and 0.5–1.6 V at 5.5 V. This proportional behavior ensures consistent noise margin across the full operating range without recalibration.