STMicroelectronics 74LX1G00STR

Overview

74LX1G00STR from STMicroelectronics is a single 2-input NAND gate IC in SOT23-5L package, operating from 1.65V to 5.5V supply, with 4.7ns max propagation delay at 3V, ±24mA output drive, and 5V-tolerant inputs enabling 5V-to-3V logic interfacing in mixed-voltage systems.

For engineers reviewing the 74LX1G00STR datasheet, 74LX1G00STR pinout, 74LX1G00STR application, or 74LX1G00STR equivalent, key selection criteria include input voltage tolerance (0–7V), symmetrical output impedance, power-down protection, low ICC (≤1µA), and guaranteed truth table operation down to 1.2V data retention.

Technical Context

This CMOS NAND gate uses sub-micron silicon gate C2MOS technology with three-stage buffered output for high noise immunity and stable switching. Its internal architecture supports rail-to-rail input acceptance independent of VCC and includes diode-based ESD protection on all pins.

The device features power-down protection that allows safe operation with VCC = 0V while inputs/outputs tolerate 0–7V, and delivers balanced tPLH ≅ tPHL propagation delays across its full 1.65–5.5V operating range.

Key Specifications

Pinout & Package

SOT23-5L surface-mount package: 2.80 × 2.60 × 1.30 mm body, 0.95 mm pitch, 5-terminal configuration with exposed pad not present.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 2-input NAND gate applications.

Compared with SN74LVC1G00DBVR and NC7SZ00P5X, the 74LX1G00STR uniquely combines 7V input tolerance, 1µA ICC, and −55°C to +125°C operation - making it the only option qualified for unregulated automotive and extended-temperature industrial use without additional protection circuitry.

Availability

74LX1G00STR is available at Aetrix Electronics and suitable for industrial PLC input conditioning, automotive body control modules, and portable medical sensor hubs requiring stable component supply across extended temperature ranges and mixed-voltage designs.

Supply support for 74LX1G00STR 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 analog, digital, and mixed-signal ICs for automotive, industrial, and consumer markets.

The 74LX series targets low-voltage, high-noise-immunity logic applications where robustness, wide supply range, and interface flexibility are essential - especially in legacy-system upgrades and harsh-environment control units.

FAQ

Can 74LX1G00STR operate with VCC = 0V while inputs are at 5V?

Yes - the device includes power-down protection that guarantees safe operation with VCC = 0V while inputs and outputs tolerate 0–7V. This prevents back-powering of the supply rail and avoids latch-up during hot-swap or partial-power-down conditions, as verified in Absolute Maximum Ratings and Recommended Operating Conditions sections of the official ST datasheet.

What is the minimum VCC required to guarantee correct logic function?

The truth table is guaranteed over VCC = 1.2V to 3.6V, with full AC/DC specifications valid from 1.65V to 5.5V. At 1.2V, only data retention (static state hold) is assured; functional operation with defined timing and drive strength begins at 1.65V, per the Recommended Operating Conditions table on page 3 of the ST datasheet.

Does 74LX1G00STR require external pull-up or pull-down resistors on unused inputs?

No - unused inputs may be left floating due to integrated input hysteresis and high-impedance design, but ST recommends tying them to VCC or GND for optimal noise immunity. The internal structure includes protection diodes and threshold stabilization that prevent metastability, unlike standard 74HC devices which mandate termination.

How does the 74LX1G00STR handle fast input edge rates?

The device specifies maximum input rise/fall time (dt/dv) of 0–10 ns/V, meaning edges faster than 10 ns/V may cause undershoot/overshoot beyond VO limits. For clean switching, maintain input slew rates within this range - achievable using series resistors (e.g., 33Ω) on long traces, as confirmed in AC Electrical Characteristics and Test Circuit sections of the datasheet.