STMicroelectronics 74LCX04TTR

Overview

74LCX04TTR from STMicroelectronics is a low-voltage CMOS hex inverter with 5V-tolerant inputs, operating from 2.0V to 3.6V supply, delivering 5.2ns max propagation delay at VCC = 3.0V, ±24mA symmetrical output drive, and latch-up immunity >500mA - used in 3.3V logic interfacing with legacy 5V buses in telecom line cards and industrial I/O modules.

For engineers reviewing the 74LCX04TTR datasheet, 74LCX04TTR pinout, 74LCX04TTR application, or 74LCX04TTR equivalent, key selection criteria include 5V input tolerance, sub-6ns propagation delay at 3V, symmetrical 24mA drive strength, PCI bus compliance at 24mA, and TSSOP-14 package thermal and routing constraints.

Technical Context

This device implements six independent CMOS inverters in a single monolithic IC using sub-micron C2MOS process, enabling full 3.3V operation while accepting 0–5.5V input signals without external level shifters. Its balanced tPLH/tPHL delays and matched output impedance support clean signal inversion in high-speed digital control paths.

Input and output structures integrate diode-based ESD protection (HBM >2kV), power-down protection ensures safe high-impedance behavior during VCC = 0V, and ICC quiescent current remains ≤10µA per gate at VCC = 2.7–3.6V with all inputs at rail.

Key Specifications

Pinout & Package

TSSOP-14 package: 4.9mm × 6.4mm body, 0.65mm pitch, 1.2mm height, lead-free and RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC04APWR and 74ALVC04PW, the 74LCX04TTR provides verified >500mA latch-up immunity and explicit PCI bus compliance - critical for industrial backplane and telecom infrastructure where fault resilience outweighs marginal speed gains.

Availability

74LCX04TTR is available at Aetrix Electronics and suitable for industrial PLC I/O modules, telecom line card signal conditioning, and embedded power sequencing requiring stable component supply across extended temperature ranges (–55°C to +125°C).

Supply support for 74LCX04TTR 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.

The 74LCX series targets low-voltage, high-speed logic interoperability - specifically engineered to bridge 3.3V core logic with 5V peripheral interfaces while minimizing power and board space.

FAQ

Can 74LCX04TTR operate with VCC = 2.5V and still meet 5V input tolerance?

Yes. The datasheet guarantees 5V-tolerant inputs across the full recommended VCC range of 2.0V to 3.6V. At VCC = 2.5V, VI may reach 5.5V without damage or functional degradation, and DC input thresholds (VIH = 2.0V, VIL = 0.8V) remain valid per specification table.

Does 74LCX04TTR require external pull-up or pull-down resistors on unused inputs?

No. Unused inputs must be tied to VCC or GND to prevent floating states and excessive ICC, but no external resistors are needed - the internal input structure has negligible leakage (±5µA), and the device does not rely on weak internal terminations.

What is the maximum capacitive load this device can drive while maintaining 5.2ns tPD?

The 5.2ns max tPD is specified at CL = 50pF, RL = 500Ω. Driving loads >50pF increases propagation delay linearly - e.g., at CL = 100pF, tPD degrades to ~7.5ns. For timing-critical paths, keep total load (trace + pin + external) ≤45pF to retain margin.

Is 74LCX04TTR pin-compatible with standard 74HC04 in TSSOP-14?

Yes. Pin numbering and function mapping (1A–6A inputs, 1Y–6Y outputs, VCC, GND) match the industry-standard 74-series hex inverter layout. However, 74HC04 lacks 5V-tolerant inputs and operates only up to VCC = 6V, so direct substitution requires verifying input voltage compatibility in the target system.