STMicroelectronics 74VHC14YMTR

Overview

74VHC14YMTR 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 output drive, and features input overvoltage tolerance up to 7V - enabling robust 5V-to-3V level translation in mixed-voltage systems.

For engineers reviewing the 74VHC14YMTR datasheet, 74VHC14YMTR pinout, 74VHC14YMTR application, or 74VHC14YMTR equivalent, key selection criteria include hysteresis voltage (0.4V min at 4.5V), symmetrical output impedance (|IOH| = IOL ≥ 8mA), power-down input protection, low ICC (2µA max), and TSSOP-14 package compatibility with legacy 74-series footprints.

Technical Context

The 74VHC14YMTR implements six independent Schmitt-trigger inverters using sub-micron C2MOS technology, each with three-stage buffered output architecture to ensure stable switching and high noise immunity. Its input hysteresis (Vh = 0.4–1.4V across VCC range) enables reliable operation on slow-rising/falling signals such as mechanical switch debouncing or analog sensor outputs.

All inputs tolerate 0–7V regardless of VCC, allowing safe interfacing between disparate supply domains. The device includes ESD protection (2kV HBM), latch-up immunity, and dynamic noise suppression (VOLP ≤ 0.8V), making it suitable for industrial control and automotive body electronics where signal integrity under electrical stress is critical.

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 74VHC14YMTR uniquely balances wide VCC range (2–5.5V), 8mA drive, and TSSOP-14 compactness - making it optimal for space-constrained, mixed-voltage industrial controllers where legacy 74-series pinout and robust overvoltage tolerance are mandatory.

Availability

74VHC14YMTR is available at Aetrix Electronics and suitable for industrial switch debouncing, RS-232 interface conditioning, motor encoder signal cleanup, and power rail monitoring requiring stable component supply across extended temperature ranges (-55°C to +125°C).

Supply support for 74VHC14YMTR 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 noise immunity in harsh environments.

FAQ

Can 74VHC14YMTR be used with a 3.3V supply while accepting 5V inputs?

Yes. The device supports VCC = 3.3V and tolerates input voltages from -0.5V to +7.0V regardless of supply level. This enables safe 5V-to-3.3V level translation without external components, provided output loading remains within 8mA per channel and total ICC stays within specification.

What is the minimum hysteresis voltage at 3.3V supply?

At VCC = 3.3V, the hysteresis voltage (Vh) is guaranteed ≥0.3V (min) per datasheet AC specifications. Measured typical value is 0.6V, providing effective noise margin against transients up to ±300mV on slow-rising signals like mechanical switch closures.

Does 74VHC14YMTR require external pull-up or pull-down resistors on unused inputs?

No. Unused inputs may be left unconnected due to built-in power-down protection, which disables input circuitry and prevents floating-node current leakage when VCC is active. However, tying unused inputs to VCC or GND is still recommended for EMI reduction in high-noise environments.

Is the 74VHC14YMTR pinout identical to the 74HC14?

Yes. Pin configuration matches industry-standard 74-series layout: inputs on pins 1,3,5,9,11,13; outputs on pins 2,4,6,8,10,12; VCC on pin 14; GND on pin 7. Functionally and physically compatible with 74HC14, 74HCT14, and 74VHC04 (though the latter lacks hysteresis).