STMicroelectronics 74LX1G132CTR

Overview

74LX1G132CTR from STMicroelectronics is a single 2-input Schmitt-trigger NAND gate in SOT323-5L package, operating from 1.65V to 5.5V, with 5.5ns max propagation delay at VCC = 4.5–5.5V, ±24mA output drive at 3V, and 1V typical hysteresis at 4.5V - enabling robust noise immunity in level-shifting and slow-edge signal conditioning applications.

For engineers reviewing the 74LX1G132CTR datasheet, 74LX1G132CTR pinout, 74LX1G132CTR application, or 74LX1G132CTR equivalent, key selection criteria include input hysteresis voltage (VT+ / VT−), symmetrical output drive (|IOH| = IOL), power-down protection, 5V-tolerant inputs, and operation down to 1.65V supply - critical for mixed-voltage interface design.

Technical Context

This device implements a CMOS Schmitt-trigger NAND with three-stage buffered output, delivering stable switching under slow-rising/falling signals and high noise immunity. Its input structure accepts 0–7V regardless of VCC, enabling safe 5V-to-3V interfacing without external clamping.

The internal C2MOS process ensures latch-up immunity >200mA, while power-down protection prevents back-driving during VCC = 0V. Output impedance symmetry (tPLH ≅ tPHL) and rail-to-rail input tolerance support reliable timing in bus receivers and reset conditioning circuits.

Key Specifications

Pinout & Package

SOT323-5L package: 1.80 × 2.20 × 0.95 mm body, 0.65 mm pitch, 5-terminal surface-mount with exposed pad not present. RoHS-compliant, moisture sensitivity level 1.

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 74LX1G132CTR uniquely combines 5V-tolerant inputs, 1V hysteresis, and sub-1µA quiescent current - making it the only option among the three for robust mixed-voltage industrial signal conditioning without external components.

Availability

74LX1G132CTR is available at Aetrix Electronics and suitable for industrial sensor interfaces, microcontroller reset conditioning, USB power control, and legacy bus signal translation requiring stable component supply and guaranteed long-term sourcing.

Supply support for 74LX1G132CTR 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 interoperability across voltage domains, emphasizing 5V-tolerant I/O, ultra-low ICC, and robust ESD/latch-up performance for embedded system interconnects.

FAQ

Can the 74LX1G132CTR operate with VCC = 1.65V while accepting 5V input signals?

Yes. The device guarantees operation from 1.65V to 5.5V and accepts −0.5V to +7.0V on inputs regardless of VCC. At 1.65V supply, inputs remain fully 5V-tolerant with no risk of damage or leakage - confirmed by absolute maximum ratings and recommended operating conditions tables.

What is the minimum load capacitance for which tPD = 5.5ns is specified?

The 5.5ns max propagation delay is specified at VCC = 4.5–5.5V with CL = 50pF and RL = 500Ω. This reflects realistic loading from PCB traces and multiple CMOS inputs; lower capacitance yields faster delays but is not characterized in the datasheet.

Does the 74LX1G132CTR support partial power-down (VCC = 0V) while other system rails remain active?

Yes. Power-down protection ensures inputs and outputs enter high-impedance state when VCC = 0V, preventing back-current flow. Inputs tolerate up to +7.0V during this state - verified in Absolute Maximum Ratings and functional description sections.

How does hysteresis vary across the full VCC range, and what impact does it have on noise margin?

Hysteresis ranges from 0.37V (min) at 1.65V to 1.11V (max) at 5.5V. At VCC = 3.3V, VH ≈ 0.87V - providing >3× typical noise amplitude margin for industrial environments. This is derived directly from VT+ and VT− values in DC specifications table.