STMicroelectronics M74HC14RM13TR

Overview

M74HC14RM13TR 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 balanced propagation delays (t_PLH ≅ t_PHL), and features ultra-low quiescent current (I_CC = 1µA max at 25°C). It is used in clock line receivers, debounced switch interfaces, and slow-edge waveform shaping in industrial control logic.

For engineers reviewing the M74HC14RM13TR datasheet, M74HC14RM13TR pinout, M74HC14RM13TR application, or M74HC14RM13TR equivalent, key selection considerations include its 1.2V typical hysteresis at 6V, 12ns typical propagation delay, TSSOP-14 package footprint, Schmitt-trigger input threshold symmetry, and compatibility with 74-series logic families in noise-prone environments.

Technical Context

The device implements six independent Schmitt-trigger inverters using silicon gate C2MOS technology, each with hysteresis defined as V_H = V_t+ − V_t−, where V_t+ and V_t− are input thresholds. At V_CC = 6V, V_t+ = 3.7V (min), V_t− = 2.4V (min), yielding V_H = 1.3V (min) - matching the 20% V_CC specification.

All inputs integrate ESD and transient voltage protection circuits, enabling robust operation in real-world signal paths. The symmetrical output impedance and matched t_PLH/t_PHL ensure minimal duty-cycle distortion when reshaping asymmetric waveforms such as mechanical switch bounce or slow-rising sensor outputs.

Key Specifications

Pinout & Package

TSSOP-14 (Thin Shrink Small Outline Package), 4.9mm × 6.4mm body, 0.65mm pitch, 14-pin surface-mount. Pin 1 marked by beveled corner or dot; lead finish: matte tin.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74HC14DR and 74LVC14APW,118, the M74HC14RM13TR offers superior temperature range, tighter hysteresis control across 2–6V, and optimal fit for TSSOP-based industrial PCBs requiring long-term reliability and noise immunity.

Availability

M74HC14RM13TR is available at Aetrix Electronics and suitable for industrial switch debouncing, RS-232 interface conditioning, and crystal oscillator buffering requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for M74HC14RM13TR 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, specializing in automotive, industrial, and power management ICs with vertical manufacturing capabilities and AEC-Q100/200 qualification infrastructure.

The M74HC series targets high-reliability, wide-temperature digital logic applications where robustness, low power, and noise immunity supersede raw speed - especially in factory automation, energy metering, and motor control subsystems.

FAQ

Is M74HC14RM13TR compatible with 5V TTL logic inputs?

No - it is a CMOS device with Schmitt-trigger inputs referenced to V_CC, not fixed TTL thresholds. Its V_t+ at 5V is ~3.15V (min), which exceeds standard TTL's 2.0V high threshold. Direct connection to 5V TTL outputs is acceptable, but TTL inputs cannot reliably drive it without level translation.

Can M74HC14RM13TR drive an LED directly?

Yes - with appropriate current-limiting resistor. At V_CC = 5V and I_OL = 4mA (min), it can sink up to ~4mA per output. For a typical 2V red LED, a 750Ω resistor yields ~4mA, staying within absolute max ratings and maintaining output voltage <0.4V.

What is the maximum input rise time this device can handle without chatter?

Based on measured hysteresis (1.3V min at 6V) and input capacitance (5pF), the device suppresses chatter for input rise/fall times up to ~1µs under typical PCB trace conditions. For slower edges (>10µs), adding a small RC filter (e.g., 10kΩ + 100pF) at the input improves noise margin further.

Does M74HC14RM13TR require external pull-up or pull-down resistors on unused inputs?

No - all inputs have internal protection diodes and are CMOS, but floating inputs cause increased I_CC and potential oscillation. STMicroelectronics recommends tying unused inputs to V_CC or GND. No external resistors are needed unless board-level ESD risk demands additional clamping.