STMicroelectronics M74HC14TTR

Overview

M74HC14TTR from STMicroelectronics is a high-speed CMOS hex Schmitt trigger inverter with 20% V_CC hysteresis per input, designed for noise-immune signal conditioning in digital interfaces. It operates from 2V to 6V, delivers symmetrical 4mA output drive (|I_OH| = I_OL ≥ 4mA), exhibits 12ns typical propagation delay at 6V, and features 1µA max quiescent current at 25°C - enabling robust edge detection in slow-rising sensor or switch inputs.

For engineers reviewing the M74HC14TTR datasheet, M74HC14TTR pinout, M74HC14TTR application, or M74HC14TTR equivalent, key selection criteria include hysteresis voltage (V_H = 0.54–1.7V across V_CC range), input threshold symmetry (V_t+/V_t−), TSSOP-14 package thermal profile, and compatibility with legacy 74-series logic timing and footprint.

Technical Context

The M74HC14TTR implements six independent Schmitt-trigger inverters using silicon gate C2MOS technology, each with precisely defined hysteresis (e.g., V_H = 1.3V typ. at V_CC = 6V) to reject noise on slow-transition signals. Its input protection circuits include ESD diodes rated for ±20mA transient current, and it maintains balanced t_PLH/t_PHL delays (12ns typ. at 6V).

It supports rail-to-rail input (0 to V_CC) and output (0 to V_CC) operation, with guaranteed VOH ≥ 4.18V and VOL ≤ 0.26V at 4.5V/–4mA, and operates across –55°C to +125°C - making it suitable for industrial control and automotive body electronics where signal integrity under EMI is critical.

Key Specifications

Pinout & Package

TSSOP-14 package: 4.9 × 6.4 mm body, 0.65 mm pitch, 1.2 mm height, lead-free, RoHS-compliant surface-mount outline with exposed pad not present.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74HC14PWR and 74LVC14APW,118, the M74HC14TTR provides superior hysteresis stability over temperature and wider V_CC range, making it preferred for automotive and industrial applications requiring deterministic noise immunity at 5V and extreme ambient conditions.

Availability

M74HC14TTR is available at Aetrix Electronics and suitable for motor position feedback, industrial pushbutton interface, automotive door latch sensing, and power supply sequencing monitoring requiring stable component supply across extended temperature and long-lifecycle programs.

Supply support for M74HC14TTR 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 power management markets.

The M74HC14 belongs to ST's high-reliability HC logic family, engineered for robust operation in harsh environments - emphasizing noise immunity, wide voltage tolerance, and extended temperature qualification for mission-critical control functions.

FAQ

What is the maximum recommended operating frequency for M74HC14TTR?

The M74HC14TTR is not characterized for clock frequency but for signal edge rate. With 12ns typical propagation delay and 13ns typical output transition time at 6V, it reliably conditions signals with rise/fall times down to ~30ns - supporting effective use in 1–5MHz encoder or switch sampling applications, provided load capacitance remains ≤50pF.

Can M74HC14TTR drive a 10kΩ pull-up resistor directly?

Yes - with VOH ≥ 4.18V at 4.5V/–4mA, the M74HC14TTR can source ≥0.4mA while maintaining valid logic-high levels. Driving a 10kΩ pull-up to 5V requires only 0.5mA, well within its 4mA output capability. Ensure layout minimizes trace capacitance to avoid slowing edges beyond specification.

Is M74HC14TTR pin-compatible with non-Schmitt 74HC04 variants?

Yes - pinout and logic function match 74HC04, 74HCT04, and 74AC04. However, the M74HC14TTR's Schmitt inputs provide hysteresis, so replacing a standard inverter may cause unintended behavior if input signals are already clean and fast; verify signal slew rates before substitution.

Does M74HC14TTR require external decoupling capacitors?

Yes - STMicroelectronics specifies a 100nF ceramic capacitor between V_CC (pin 14) and GND (pin 7), placed within 5mm of the package. This suppresses supply transients generated by simultaneous switching of multiple gates and prevents output oscillation or false triggering under heavy capacitive loads.