STMicroelectronics 74LX1G07STR

Overview

74LX1G07STR from STMicroelectronics is a single non-inverting buffer with open-drain output, designed for level-shifting and wired-OR logic interfacing between 5V and 3V systems. It operates from 1.65V to 5.5V supply, delivers 4.2ns max propagation delay at 3.3V, supports 50mA output sink current, and features power-down protection enabling safe I/O operation even when VCC = 0V.

For engineers reviewing the 74LX1G07STR datasheet, 74LX1G07STR pinout, 74LX1G07STR application, or 74LX1G07STR equivalent, key selection criteria include open-drain drive capability, 0–7V input tolerance independent of supply, guaranteed truth table down to 1.2V, latch-up immunity, and SOT23-5L tape-and-reel packaging for automated assembly.

Technical Context

The 74LX1G07STR implements a two-stage CMOS buffer with open-drain NMOS output stage, enabling flexible pull-up configuration and bus arbitration. Its C2MOS process ensures high noise immunity and stable output under mixed-voltage conditions.

Input pins tolerate −0.5V to +7.0V regardless of VCC state, and output remains high-impedance (Z) when disabled - critical for hot-swap and power-gated subsystems. The device retains data at 1.2V and functions across −55°C to +125°C.

Key Specifications

Pinout & Package

SOT23-5L package: 5-pin surface-mount, 1.3mm height, 2.8 × 2.6 mm footprint, tape-and-reel compatible (TR), RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar open-drain buffer applications.

Compared with SN74LVC1G07DBVR and NC7SZ07P5X, the 74LX1G07STR uniquely combines 7V input tolerance, power-down protection, and −55°C qualification - making it the only option for automotive and industrial systems requiring fail-safe I/O during supply transients.

Availability

74LX1G07STR is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, automotive body control modules, USB-C power delivery negotiation, and smart energy meter communication interfaces requiring stable component supply across long production lifecycles.

Supply support for 74LX1G07STR 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 power-management applications.

The 74LX series targets low-voltage, high-noise-immunity logic interfacing - specifically engineered for mixed-supply systems where robustness, level translation, and power sequencing safety are mandatory.

FAQ

Can 74LX1G07STR drive an LED directly?

Yes - its 32mA sink capability at 5V V_CC supports direct LED driving with appropriate series resistance. At lower V_CC, output voltage drop increases (e.g., 0.55V at 32mA, 4.5V), so verify forward voltage margin. Do not exceed 50mA absolute maximum rating.

What happens to the output when V_CC = 0V?

When V_CC = 0V, the output enters high-impedance state due to power-down protection circuitry. Input pins remain tolerant to 0–7V, preventing back-current flow and protecting upstream drivers - critical for hot-swap and partial-power-down systems.

Is pin 1 (NC) required to be connected?

No - pin 1 is internally unconnected and must be left floating or tied to GND per PCB layout best practices. Connecting it to V_CC or signal lines has no functional effect but may increase parasitic capacitance or risk mechanical shorting in dense layouts.

Does 74LX1G07STR support 1.2V logic inputs?

Yes - the device guarantees truth table operation down to 1.2V V_CC, and input thresholds scale with supply (e.g., V_IL = 0.25V_CC). At 1.2V, inputs recognize <0.3V as LOW and >0.9V as HIGH, enabling compatibility with ultra-low-voltage microcontrollers.