onsemi 74LCX14M

Overview

74LCX14M from ON Semiconductor is a low-voltage hex inverter IC with Schmitt-trigger inputs, designed for noise-immune signal conditioning in mixed-voltage systems. It operates from 2.3V to 3.6V V_CC, supports 5V-tolerant inputs up to 7V, delivers ±24mA output drive at 3.0V, and achieves 6.5ns max propagation delay at 3.3V - enabling reliable level translation between 2.5V/3.3V logic and legacy 5V interfaces in industrial control and communications hardware.

For engineers reviewing the 74LCX14M datasheet, pinout, applications, or equivalent options, this device is selected for its hysteresis-enhanced noise immunity, power-down high-impedance I/O states, JEDEC-standard SOIC-14 package compatibility, and verified performance across –40°C to +85°C ambient conditions.

Technical Context

The 74LCX14M implements six independent CMOS inverter gates, each incorporating internal Schmitt-trigger input circuitry with typical hysteresis of 1.0V - defined by transistor ratios and stable over temperature and supply voltage variation. Its input thresholds (V_t+ = 1.2–2.2V, V_t– = 0.6–1.5V at V_CC = 3.0V) enable clean edge regeneration of slow-rising signals.

It features 5V-tolerant inputs compatible with 5V, 3V, and 2.5V logic families without external level-shifting components, and includes power-down protection with high-impedance inputs and outputs when V_CC = 0V - critical for hot-swap and partial-power-down system architectures.

Key Specifications

Pinout & Package

74LCX14M is housed in a 14-lead Small Outline Integrated Circuit (SOIC) package per JEDEC MS-012, 0.150" narrow body, with standard 1.27mm lead pitch and gull-wing leads. The package supports reflow soldering per JEDEC J-STD-020B and is lead-free.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC14APWR and MC74VHC14DR2G, the 74LCX14M uniquely combines guaranteed 7V input tolerance, stable 1.0V hysteresis across 2.3–3.6V operation, and power-down high-Z behavior - making it the preferred choice for mixed-voltage industrial interfaces where reliability under voltage mismatch is non-negotiable.

Availability

74LCX14M is available at Aetrix Electronics and suitable for industrial sensor interface, legacy system level translation, and hot-swappable backplane logic requiring stable component supply, long-term lifecycle support, and consistent parametric performance across manufacturing lots.

Supply support for 74LCX14M 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

ON Semiconductor is a global semiconductor manufacturer specializing in energy-efficient power management, analog, logic, and sensor solutions for automotive, industrial, cloud computing, and IoT applications.

The 74LCX14M belongs to the legacy LCX low-voltage logic family, originally developed by Fairchild and integrated into ON Semiconductor's portfolio to serve industrial and communications systems requiring robust mixed-voltage interoperability and noise immunity.

FAQ

What is the maximum input voltage rating for the 74LCX14M?

The 74LCX14M supports DC input voltages up to 7.0V, as specified in its Absolute Maximum Ratings table. This 5V-tolerant capability allows direct connection to 5V logic outputs without external protection components, and is validated across the full operating temperature range of –40°C to +85°C. The 74LCX14M maintains functional integrity even when VI exceeds V_CC by up to 3.7V, provided V_CC remains within 2.3–3.6V.

Does the 74LCX14M support power-down mode with high-impedance I/O?

Yes, the 74LCX14M features power-down high-impedance inputs and outputs - meaning both inputs and outputs enter a high-Z state when V_CC = 0V. This behavior is explicitly documented in the Features section and prevents back-driving or bus contention during power sequencing, hot-swap events, or partial system shutdown. The 74LCX14M retains this property regardless of input voltage state during power loss.

What is the typical hysteresis voltage of the 74LCX14M at 3.0V V_CC?

At V_CC = 3.0V, the 74LCX14M exhibits a typical hysteresis (V_H) of 0.8V, with a guaranteed range of 0.4V to 1.2V per the DC Electrical Characteristics table. This hysteresis arises from internal transistor ratios and is intentionally insensitive to temperature and supply variation - ensuring consistent noise margin in industrial environments where the 74LCX14M is commonly deployed.

Can the 74LCX14M drive standard 74LCX fanout loads?

Yes, the 74LCX14M delivers ±24mA output drive at V_CC = 3.0V, which exceeds the ±20mA requirement for driving 10 standard 74LCX inputs (each drawing ~2mA). Its output structure is fully compatible with LCX-family loading conventions, and propagation delay remains within specification (≤6.5ns) under these conditions. The 74LCX14M thus supports full fanout without derating in typical 3.3V logic designs.

Is the 74LCX14M RoHS-compliant and lead-free?

Yes, the 74LCX14M is lead-free and complies with JEDEC J-STD-020B reflow standards. All packages - including the M14A SOIC variant - are manufactured to meet RoHS Directive 2011/65/EU requirements. The device carries no exemptions and contains <1000 ppm lead by weight, verified through material declarations and third-party testing reports maintained by ON Semiconductor.