STMicroelectronics 74LX1G132STR

Overview

74LX1G132STR from STMicroelectronics is a single 2-input Schmitt-trigger NAND gate in SOT23-5L package, operating from 1.65V to 5.5V with 5.5ns max propagation delay at 3V, 24mA output drive, and ±1µA quiescent current. It enables robust signal conditioning in mixed-voltage digital interfaces, especially for slow-rising noise-prone lines in industrial sensor I/O and level-shifting applications.

For engineers reviewing the 74LX1G132STR datasheet, 74LX1G132STR pinout, 74LX1G132STR application, or 74LX1G132STR equivalent, key selection criteria include hysteresis voltage (0.71V min at 5.5V), input tolerance up to 7V regardless of VCC, symmetrical output impedance, power-down protection, and guaranteed truth table operation down to 1.2V data retention.

Technical Context

The device implements a three-stage CMOS buffer-output architecture with Schmitt-trigger inputs, delivering stable switching despite slow or noisy input transitions. Its hysteresis (VT+ − VT−) ranges from 0.37V to 1.11V depending on VCC, enabling reliable noise rejection in line-receiver roles.

Input protection accepts 0–7V independent of supply voltage, supporting hot-plug and 5V-to-3V interfacing without external clamping. All I/O pins feature ESD protection circuits and power-down immunity-ensuring safe operation during partial power states or supply sequencing.

Key Specifications

Pinout & Package

SOT23-5L package: 5-pin surface-mount, 1.3mm height, 2.8mm × 1.5mm footprint, lead pitch 0.95mm, RoHS-compliant, tape-and-reel delivery (74LX1G132STR).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar Schmitt-trigger NAND gate applications.

Compared with SN74LVC1G132DBVR and NC7SZ132P5X, the 74LX1G132STR uniquely combines 7V input tolerance, 1.2V data retention, and full 1.65–5.5V operation-making it the only choice for legacy 5V sensor integration into modern low-voltage embedded systems requiring long-term supply stability.

Availability

74LX1G132STR is available at Aetrix Electronics and suitable for industrial sensor interface, automotive body control modules, and IoT edge node wake-up circuits requiring stable component supply across extended temperature ranges (−55°C to +125°C) and long product lifecycles.

Supply support for 74LX1G132STR 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-noise-immunity logic interfacing-specifically engineered for seamless integration between legacy 5V systems and next-generation sub-2V microcontrollers and FPGAs.

FAQ

Can 74LX1G132STR operate with V_CC = 1.8V while accepting 5V inputs?

Yes. The device guarantees full functionality at V_CC = 1.65–5.5V and accepts input voltages from −0.5V to +7.0V regardless of supply level. At 1.8V V_CC, inputs up to 5V are safely clamped internally without damage or logic corruption, enabling direct 5V-to-1.8V level translation without external components.

What is the minimum load capacitance for guaranteed t_PD = 5.5ns performance?

The 5.5ns maximum propagation delay is specified under AC test conditions with CL = 50pF and RL = 500Ω at V_CC = 4.5–5.5V. For loads ≤30pF, t_PD improves to ≤4.5ns. Performance remains valid down to CL = 15pF, but below that, delay becomes dominated by internal gate capacitance rather than load.

Does 74LX1G132STR support partial power-down mode?

Yes. Power-down protection is built into all inputs and outputs: when V_CC = 0V, inputs tolerate up to 7V and outputs remain high-impedance with ≤10µA off-state leakage. This allows safe operation during power sequencing, sleep-mode isolation, or hot-swap scenarios without risk of back-powering or latch-up.

How does its Schmitt trigger differ from standard TTL/NAND hysteresis?

Unlike standard logic gates, the 74LX1G132STR uses dedicated Schmitt-trigger input circuitry with asymmetric thresholds (VT+ and VT−) that vary with V_CC. At 5.5V, VT+ = 2.61–3.33V and VT− = 1.87–2.29V, yielding 0.71–1.11V hysteresis-significantly larger than typical TTL (≈0.8V) and more stable over temperature and supply variation.