STMicroelectronics 74LX1GU04CTR

Overview

74LX1GU04CTR 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 at 3 V, and 1 µA max quiescent current at 25 °C - used in level-shifting and signal conditioning within mixed-voltage digital interfaces.

For engineers reviewing the 74LX1GU04CTR datasheet, 74LX1GU04CTR pinout, 74LX1GU04CTR application, or 74LX1GU04CTR equivalent, key selection criteria include 5V input tolerance in sub-3.3V systems, symmetrical 24 mA drive capability, power-down protection, latch-up immunity, and SC70-5 package compatibility with high-density PCB layouts.

Technical Context

This device implements a three-stage buffered inverter topology using sub-micron C2MOS technology, enabling stable output and high noise immunity across 1.65–5.5 V supply range. Its input structure accepts 0–7 V regardless of VCC, supporting robust interfacing between 3.3 V logic and legacy 5 V signal domains.

The output stage provides matched |IOH| = |IOL| ≥ 24 mA at VCC = 3.0–3.6 V, with balanced tPLH ≅ tPHL propagation delays and built-in diode protection on all pins. Power-down protection ensures safe operation during VCC = 0 V conditions without back-driving or latch-up risk.

Key Specifications

Pinout & Package

74LX1GU04CTR is housed in a 5-pin SC70 (SOT-323-5L) package - ultra-small footprint (1.8 × 2.4 mm), 0.65 mm pitch, thin profile (< 1.1 mm height) - optimized for space-constrained portable and wearable electronics.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC1G04DBVR and NC7SZ04P5X, the 74LX1GU04CTR uniquely combines 0–7 V input tolerance, true power-down protection, and sub-µA ICC - making it the only choice for robust, low-power, mixed-supply industrial and automotive signal conditioning.

Availability

74LX1GU04CTR is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive body control modules, and portable medical devices requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for 74LX1GU04CTR 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, Switzerland, designing and manufacturing microcontrollers, power management ICs, sensors, and analog/mixed-signal products for industrial, automotive, and consumer markets.

The 74LX series targets low-voltage, high-noise-immunity logic applications in mixed-supply systems - emphasizing 5 V tolerance, ultra-low power, and enhanced robustness for harsh-environment deployment.

FAQ

Is 74LX1GU04CTR compatible with 1.2 V logic systems?

No - the minimum recommended VCC is 1.65 V per datasheet Section 3. While data retention is specified down to 1.2 V, functional operation (truth table, drive strength, timing) is only guaranteed from 1.65 V. Below that, propagation delay increases significantly and output drive degrades.

Can Pin 1 (N.C.) be connected to GND or VCC?

No - Pin 1 is internally unconnected and must remain floating. Connecting it to any potential risks unintended coupling, increased parasitic capacitance, or violation of mechanical stress limits in the SC70 package. STMicroelectronics explicitly states "Not connected" with no provision for tie-off.

What is the maximum capacitive load this inverter can drive reliably?

At VCC = 3.3 V, the device maintains tPD ≤ 4.7 ns with CL = 50 pF (per AC specs, page 4). For reliable signal integrity beyond 50 pF, external series termination or buffer staging is recommended - the internal drive strength is optimized for point-to-point or light fan-out (≤3 LVTTL loads).

Does 74LX1GU04CTR support hot-swap insertion when VCC is off?

Yes - its power-down protection architecture allows 0–7 V signals on inputs and outputs with VCC = 0 V, provided IOK and IIK limits (±50 mA) are not exceeded. This enables safe insertion into live backplanes or partially powered systems without damaging the IC or upstream drivers.