STMicroelectronics M74HC14YTTR

Overview

M74HC14YTTR from STMicroelectronics is a high-speed CMOS hex Schmitt inverter with 20% V_CC input hysteresis, designed for noise-immune signal conditioning in automotive-grade digital interfaces. It operates from 2 V to 6 V, delivers symmetrical 4 mA output drive (I_OL/|I_OH|), exhibits 12 ns typical propagation delay at 6 V, and supports -55 °C to +125 °C operation.

For engineers reviewing the M74HC14YTTR datasheet, M74HC14YTTR pinout, M74HC14YTTR application, or M74HC14YTTR equivalent, key selection criteria include hysteresis voltage (0.8–1.7 V at 6 V), ESD robustness (2 kV HBM), SO14/TSSOP14 package compatibility, and AEC-Q100 qualification for automotive signal integrity.

Technical Context

The M74HC14YTTR implements six independent Schmitt-trigger inverters using silicon gate C2MOS technology, each featuring 20% V_CC hysteresis to reject slow-rising/falling noise on input lines. Its truth table is strictly complementary (L→H, H→L), and all inputs include protection against static discharge and transient overvoltage.

It maintains balanced t_PLH ≃ t_PHL propagation delays across temperature and supply voltage, with input capacitance of 5 pF (typ.) and power dissipation capacitance of 28 pF - enabling stable timing in clock distribution, debouncing, and waveform shaping circuits without external components.

Key Specifications

Pinout & Package

TSSOP14 package: 4.9 mm × 6.4 mm × 1.05 mm body, 0.65 mm pitch, exposed pad not present, RoHS-compliant ECOPACK® grade.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74HC14PWR and MC74HC14ADTR2G, the M74HC14YTTR uniquely combines AEC-Q100 Grade 0 qualification, TSSOP14 footprint, and guaranteed 125 °C operation - making it the only choice for automotive powertrain signal conditioning where lifecycle traceability and thermal reliability are non-negotiable.

Availability

M74HC14YTTR is available at Aetrix Electronics and suitable for automotive powertrain control, industrial HMI panels, and USB-C PD sequencers requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for M74HC14YTTR 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 microcontrollers, power ICs, sensors, and analog/mixed-signal devices for automotive, industrial, and consumer markets.

The M74HC14YTTR belongs to ST's automotive-qualified HC logic family, engineered specifically for robust signal conditioning in harsh-environment electronic control units where noise immunity, thermal stability, and qualification compliance are critical.

FAQ

What is the maximum operating frequency supported by M74HC14YTTR?

The M74HC14YTTR does not specify a maximum clock frequency, but its 12 ns typical propagation delay at 6 V implies reliable operation up to ~40 MHz for clean square-wave inputs. Actual usable frequency depends on load capacitance, rise time, and hysteresis margin - for 50 pF loads and 6 ns input edges, stable switching is confirmed up to 25 MHz in automotive test reports.

Can M74HC14YTTR drive LED indicators directly?

No - while it sources/sinks ≥4 mA, its absolute maximum output current is ±25 mA per pin and total package current is limited. Driving even a 2 mA LED continuously risks exceeding thermal limits in TSSOP14. Use an external transistor or dedicated LED driver; the device is intended for logic-level signal conditioning, not power interfacing.

Does M74HC14YTTR require external pull-up or pull-down resistors on inputs?

No - all six inputs have built-in Schmitt-trigger hysteresis and protection diodes. Unused inputs must be tied to V_CC or GND to prevent floating states and excessive ICC; no external resistors are needed for proper logic function or noise immunity.

Is the TSSOP14 package of M74HC14YTTR compatible with reflow soldering per J-STD-020?

Yes - the TSSOP14 package is qualified for standard lead-free reflow profiles. Peak temperature is rated to 260 °C for 10 seconds (per JEDEC J-STD-020D), with moisture sensitivity level (MSL) 1 - unlimited floor life at ≤30 °C/60% RH, requiring no baking prior to assembly.