STMicroelectronics 74LX1G32STR

Overview

74LX1G32STR from STMicroelectronics is a low-voltage CMOS single 2-input OR gate with 5V-tolerant inputs, operating from 1.65 V to 5.5 V supply, delivering 4.7 ns max propagation delay at 3 V, ±24 mA output drive, and 1 µA max quiescent current - deployed in mixed-voltage logic interfacing and portable power-sensitive systems.

For engineers reviewing the 74LX1G32STR datasheet, 74LX1G32STR pinout, 74LX1G32STR application, or 74LX1G32STR equivalent, key selection criteria include 5V input tolerance in sub-3.3V systems, symmetrical 24 mA drive capability at 3 V, latch-up immunity, power-down protection, and SOT23-5L package compatibility with high-density PCB layouts.

Technical Context

This device implements a single-stage CMOS OR logic function using sub-micron C2MOS technology with three-stage buffered output, enabling high noise immunity and stable switching across 1.65–5.5 V operation. Input and output structures support 0–7 V signal acceptance independent of VCC, enabling safe interfacing between 1.8 V, 2.5 V, 3.3 V, and 5 V domains.

The internal design includes diode-based ESD protection on all pins, power-down protection that prevents back-driving during VCC = 0 V, and balanced tPLH/tPHL propagation delays (≤0.3 ns skew at 3 V). It retains data down to 1.2 V and operates from –55 °C to +125 °C.

Key Specifications

Pinout & Package

SOT23-5L package: 5-pin surface-mount, 1.45 mm height, 2.80 × 2.60 mm body, 0.95 mm pin pitch, moisture sensitivity level 1 (MSL1), RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC1G32DBVR and NC7SZ32P5X, the 74LX1G32STR uniquely combines 7 V input tolerance, power-down protection, and 1 µA ICC - making it the only choice for mixed-voltage systems requiring guaranteed safe operation during supply transients or partial power loss.

Availability

74LX1G32STR is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, automotive body control modules, and portable medical sensor hubs requiring stable component supply across extended temperature and mixed-voltage conditions.

Supply support for 74LX1G32STR 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 silicon solutions for automotive, industrial, and consumer markets since 1987.

The 74LX series targets low-voltage, high-noise-immunity logic for mixed-signal and battery-powered systems - emphasizing 5V-tolerant I/O, ultra-low static current, and robust operation across wide temperature and supply ranges.

FAQ

Can 74LX1G32STR be used with V_CC = 1.8 V while accepting 5 V inputs?

Yes. The device guarantees 5 V-tolerant inputs across its full 1.65–5.5 V V_CC range, including at 1.8 V. Input clamp diodes and internal protection circuitry allow 0–7 V signals regardless of supply voltage, with no external components required.

Does 74LX1G32STR support hot insertion when V_CC is unpowered?

Yes. Power-down protection ensures inputs and outputs remain high-impedance and non-backdriving when V_CC = 0 V. This prevents current injection into the supply rail and avoids unintended activation of downstream circuitry during hot-swap events.

What is the minimum load capacitance for achieving the 4.7 ns t_PD specification?

The 4.7 ns max propagation delay is specified at V_CC = 3.0–3.6 V with C_L = 50 pF and R_L = 500 Ω. Lower capacitance (e.g., 15 pF) yields faster measured delay (~4.1 ns), but timing margins must account for board trace capacitance and probe loading in validation.

Is 74LX1G32STR pin-compatible with other SOT23-5 logic gates?

Yes - the pinout (1A, 1B, GND, 1Y, V_CC) matches industry-standard SOT23-5 logic gates including 74LVC1G32 and 74AUP1G32. However, electrical behavior differs significantly: only 74LX1G32STR offers full 7 V input tolerance and power-down protection at V_CC = 0 V.