STMicroelectronics M74HCT14B1R

Overview

M74HCT14B1R from STMicroelectronics is a high-speed CMOS hex Schmitt inverter in 14-pin DIP package, featuring 0.7 V typical hysteresis at VCC = 4.5 V, 19 ns typical propagation delay, and ±4 mA symmetrical output drive. It interfaces TTL/NMOS logic with HCMOS systems and is used in noise-prone signal conditioning for industrial control inputs.

For engineers reviewing the M74HCT14B1R datasheet, M74HCT14B1R pinout, M74HCT14B1R application, or M74HCT14B1R equivalent, key selection criteria include input hysteresis voltage (VP/VN), propagation delay symmetry (tPLH ≅ tPHL), output drive capability at 4 mA, and DIP-14 mechanical compatibility with legacy board layouts.

Technical Context

The device implements six independent Schmitt-trigger inverters using silicon gate C2MOS technology, each with verified hysteresis of 0.4–1.4 V (VCC = 4.5–5.5 V) and balanced tPLH/tPHL delays within 30–45 ns across temperature. Input protection includes diode clamps for ±20 mA transient current handling.

It operates over -55°C to +125°C with supply voltage 4.5–5.5 V, supports direct TTL/NMOS interfacing via VIH/VIL thresholds aligned to 5 V logic families, and maintains <1 µA quiescent ICC at 25°C - enabling low-power noise filtering in always-on sensor front-ends.

Key Specifications

Pinout & Package

Package: Plastic DIP-14 (dual in-line package, 0.3" wide, 2.54 mm pitch), per mechanical data P001A.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74HCT14N, M74HCT14B1R offers identical performance but different manufacturing origin and lifecycle status; compared with 74HC14N, it delivers superior noise rejection and guaranteed drive strength at 5 V - making it preferred for industrial signal integrity-critical roles.

Availability

M74HCT14B1R is available at Aetrix Electronics and suitable for industrial control I/O conditioning, legacy system repair, and sensor interface design requiring stable component supply and DIP-14 through-hole compatibility.

Supply support for M74HCT14B1R 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.

M74HCT14 belongs to the HCT logic family - engineered for TTL-compatible operation at 5 V with CMOS power efficiency, specifically targeting robust interfacing between legacy and modern digital systems.

FAQ

What is the maximum operating temperature for M74HCT14B1R?

The M74HCT14B1R is rated for continuous operation from -55°C to +125°C, with full DC/AC specifications guaranteed over -40°C to +85°C. This extended range supports deployment in under-hood automotive sensors, industrial motor drives, and outdoor telecom equipment without derating.

Can M74HCT14B1R drive a 74LS00 input directly?

Yes - M74HCT14B1R outputs meet 74LS input requirements: VOH ≥ 2.7 V and VOL ≤ 0.5 V at IO = ±0.4 mA, and its 4 mA drive capability exceeds LS-series fan-out needs. No level shifter is required for direct connection to 74LS logic.

Is there a surface-mount alternative with identical pinout?

Yes - the SOP-14 variant M74HCT14M1R shares identical logic function, electrical specs, and pin numbering. Its 8.75 mm × 6.2 mm SO-14 footprint allows drop-in replacement on reflow-assembled boards where DIP is not feasible.

Does M74HCT14B1R require external pull-up resistors on inputs?

No - inputs are internally protected with clamp diodes and have negligible leakage (<1 µA). Pull-ups are unnecessary unless implementing wired-OR logic or open-collector emulation; unused inputs should be tied to VCC or GND to prevent floating states.