STMicroelectronics 74LX1GU04STR

Overview

74LX1GU04STR from STMicroelectronics is a low-voltage CMOS single inverter with 5V-tolerant inputs, operating from 1.65 V to 5.5 V, delivering 4.2 ns max propagation delay at 3 V, ±24 mA output drive, and 1 µA max quiescent current at 25°C - used for level-shifting and signal inversion in mixed-voltage 3.3/5 V digital interfaces.

For engineers reviewing the 74LX1GU04STR datasheet, 74LX1GU04STR pinout, 74LX1GU04STR application, or 74LX1GU04STR equivalent, key selection criteria include 5V input tolerance in sub-3.3V systems, symmetrical 24 mA drive capability at 3 V, power-down protection for hot-swap compatibility, and SOT23-5L package suitability for space-constrained board layouts.

Technical Context

This device implements a three-stage buffered inverter architecture using sub-micron C2MOS technology, enabling high noise immunity and stable rail-to-rail output swing across its full 1.65–5.5 V supply range. Input and output structures incorporate diode clamps and power-down protection, allowing safe operation with inputs up to 7 V regardless of VCC state.

The logic function is strictly inverting (Y = NOT A), with balanced tPLH ≅ tPHL propagation delays and symmetrical |IOH| = IOL output impedance. It supports data retention down to 1.2 V and operates over –55°C to +125°C, meeting industrial-grade reliability requirements without external biasing.

Key Specifications

Pinout & Package

SOT23-5L package: 5-pin surface-mount plastic package with 0.95 mm pitch, 1.45 mm height, and thermal pad omitted - optimized for automated placement and reflow soldering in high-density PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC1G04DBVR and NC7SZ04P5X, the 74LX1GU04STR uniquely combines 5 V input tolerance, –55°C to +125°C operation, and 4.2 ns speed at 3 V - making it the only choice for robust mixed-voltage industrial and automotive signal conditioning where reliability and voltage interoperability are non-negotiable.

Availability

74LX1GU04STR is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive body control modules, portable medical device logic, and industrial Ethernet PHY interfaces requiring stable component supply across extended temperature and mixed-voltage conditions.

Supply support for 74LX1GU04STR 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 74LX series targets low-voltage, high-speed logic interfacing in mixed-supply systems - emphasizing 5 V tolerance, wide VCC range, and industrial temperature resilience without sacrificing speed or power efficiency.

FAQ

Can 74LX1GU04STR be used with VCC = 0 V while 5 V signals are applied to input?

Yes - the device features power-down protection on both inputs and outputs. When VCC = 0 V, inputs tolerate 0–7 V, and outputs enter high-impedance state without leakage or latch-up risk. This enables safe hot-swap and partial-power-down operation in modular systems.

What is the minimum supply voltage for guaranteed logic operation?

The truth table is guaranteed from 1.2 V to 3.6 V, and recommended operating VCC starts at 1.65 V. Below 1.65 V, output drive and propagation delay degrade; however, data retention is maintained down to 1.2 V - useful for brown-out detection circuits.

Does Pin 1 (N.C.) require any PCB layout consideration?

Pin 1 is internally unconnected and must not be soldered to any net. STMicroelectronics recommends leaving it floating or connecting it to GND via a 0 Ω resistor for mechanical stability - never tie to VCC or signal nets, as it may induce parasitic coupling or thermal stress.

How does the 74LX1GU04STR handle fast input edges in low-VCC operation?

Input rise/fall time is specified up to 10 ns/V - meaning a 1 V/ns edge is acceptable at all VCC levels. At 1.65 V, the internal clamping diodes and buffered architecture suppress ringing and overshoot, ensuring clean transitions even with unterminated 50 Ω source impedances.