onsemi 74LCX14SJX

Overview

74LCX14SJX from ON Semiconductor is a low-voltage hex inverter IC with Schmitt-trigger inputs, 5V-tolerant I/O, and operation across 2.3V–3.6V V_CC. It delivers 6.5ns max propagation delay at 3.3V, ±24mA output drive at 3.0V, and high-impedance power-down behavior. It enables robust signal conditioning in mixed-voltage digital interfaces such as industrial control bus receivers.

For engineers reviewing the 74LCX14SJX datasheet, pinout, applications, or equivalent options, key selection criteria include Schmitt-trigger hysteresis (0.4–1.2V), 5V input tolerance, DQFN package compatibility, and low ICC (10µA max) for battery-sensitive systems.

Technical Context

The 74LCX14SJX implements six independent CMOS inverter gates, each incorporating internal hysteresis via transistor-ratio-defined thresholds-yielding typical V_H = 0.4–1.2V across supply range. Its Schmitt-trigger inputs convert slow-rising/falling signals into clean, jitter-free logic transitions without external RC networks.

Input voltage tolerance extends to 7V, enabling direct interfacing between 2.5V/3.3V logic domains and legacy 5V systems without level shifters. The device supports power-down mode with high-impedance I/Os and meets JEDEC 78 latch-up and >2000V HBM ESD specifications.

Key Specifications

Pinout & Package

74LCX14SJX is supplied in a 14-lead SOP (EIAJ TYPE II, 5.3mm wide) package per ordering code 74LCX14SJ - the "X" suffix denotes tape-and-reel packaging. Pinout matches standard 74-series hex inverter configuration.

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 MC74VHC14DT, the 74LCX14SJX uniquely combines guaranteed 5V input tolerance, industry-standard Schmitt hysteresis, and sub-7ns delay in a lead-free SOP package-making it the preferred choice for interoperable 2.5V/3.3V-to-5V signal bridging where reliability under voltage mismatch is critical.

Availability

74LCX14SJX is available at Aetrix Electronics and suitable for industrial sensor interfaces, USB peripheral control, legacy bus signal conditioning, and low-power logic glue requiring stable component supply and long-term manufacturability.

Supply support for 74LCX14SJX 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 discrete solutions for automotive, industrial, cloud, and consumer markets.

The 74LCX14SJX belongs to the LCX family of low-voltage, high-speed CMOS logic devices designed specifically for mixed-supply system interfacing-emphasizing voltage tolerance, noise immunity, and low static power in space-constrained applications.

FAQ

What is the maximum input voltage rating for the 74LCX14SJX?

The 74LCX14SJX supports DC input voltages up to +7.0V, enabling safe interfacing with 5V logic systems without external protection. This 5V-tolerant feature is explicitly guaranteed across the full operating temperature range (–40°C to +85°C) and is validated per the Absolute Maximum Ratings table in the official datasheet revision 1.7.1.

Does the 74LCX14SJX support power-down mode with high-impedance I/Os?

Yes, the 74LCX14SJX features power-down high-impedance inputs and outputs when V_CC is removed or held below 1.5V. This behavior prevents bus contention and leakage currents during system sleep states, and is confirmed in the General Description and DC Electrical Characteristics sections of the datasheet.

What is the typical hysteresis voltage (V_H) of the 74LCX14SJX at 3.0V V_CC?

The typical hysteresis voltage (V_H) for the 74LCX14SJX at V_CC = 3.0V is 0.4–1.2V, derived from the difference between positive-going (V_t+) and negative-going (V_t−) input thresholds. This value is measured and specified in the DC Electrical Characteristics table (Rev. 1.7.1, page 3).

Is the 74LCX14SJX pin-compatible with other 74-series hex inverters in SOP packages?

Yes, the 74LCX14SJX uses the standard 14-pin SOP footprint (EIAJ TYPE II, 5.3mm wide) and follows conventional 74-series pinout: inputs on odd pins (1,3,5,9,11,13), outputs on even pins (2,4,6,10,12,14), with V_CC on pin 14 and GND on pin 7-matching mechanical and electrical layout requirements of 74HC14, 74HCT14, and 74LVC14 variants in same package.

What is the maximum output drive current for the 74LCX14SJX at 2.5V V_CC?

At V_CC = 2.5V, the 74LCX14SJX delivers ±8mA output sink/source current, as specified in the Recommended Operating Conditions table (Rev. 1.7.1, page 2). This value ensures reliable driving of light loads such as LED indicators or small-capacitance logic inputs under low-voltage operation.