STMicroelectronics 74LX1G02STR

Overview

74LX1G02STR from STMicroelectronics is a low-voltage CMOS single 2-input NOR gate in SOT23-5L package, operating from 1.65V to 5.5V supply, with 4.2ns max propagation delay at 3V, ±24mA output drive, and 5V-tolerant inputs enabling 5V-to-3V logic interfacing in portable power management circuits.

For engineers reviewing the 74LX1G02STR datasheet, 74LX1G02STR pinout, 74LX1G02STR application, or 74LX1G02STR equivalent, key selection criteria include input voltage tolerance (0–7V), symmetrical output impedance, power-down protection, latch-up immunity, and sub-2.5ns rise/fall time compatibility with 3.3V/5V mixed-signal systems.

Technical Context

This device implements a single-stage NOR logic function with three-stage buffered output architecture, delivering high noise immunity and stable switching across its full 1.65–5.5V operating range. Its internal C2MOS design enables data retention down to 1.2V while maintaining guaranteed truth table operation from 1.2V to 3.6V.

Input protection supports 0–7V input voltages independent of VCC, and power-down protection ensures safe operation during supply sequencing or brown-out conditions. All I/O pins feature ESD protection circuits compliant with HBM ≥2kV.

Key Specifications

Pinout & Package

SOT23-5L surface-mount package: 2.80 × 1.50 × 1.30 mm body, 0.95 mm pitch, tape-and-reel compatible, JEDEC MO-178AA compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar NOR gate applications.

Compared with SN74LVC1G02DBVR and NC7SZ02P5X, the 74LX1G02STR uniquely delivers verified 0–7V input tolerance without external components, making it the only option among the three qualified for direct 5V-to-3V interfacing in unregulated or hot-plug environments.

Availability

74LX1G02STR is available at Aetrix Electronics and suitable for battery-powered sensor nodes, industrial PLC input modules, and USB-C power delivery sequencers requiring stable component supply across extended temperature and mixed-voltage conditions.

Supply support for 74LX1G02STR 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 family targets low-voltage, high-speed logic interfacing in portable and mixed-supply systems, emphasizing voltage translation, power efficiency, and robustness in real-world signal integrity conditions.

FAQ

Can the 74LX1G02STR operate with VCC = 1.8V while accepting 5V inputs?

Yes. The device guarantees 5V-tolerant inputs across its full 1.65–5.5V supply range, including at 1.8V VCC. Inputs tolerate −0.5V to +7.0V regardless of supply voltage, with internal clamping diodes and power-down protection ensuring safe operation during undervoltage conditions.

What is the maximum capacitive load this NOR gate can drive reliably?

At VCC = 3.0V, the 74LX1G02STR maintains ≤4.2ns propagation delay driving up to 50pF load with 500Ω termination. For loads exceeding 50pF, rise/fall times increase linearly; stable operation is confirmed up to 100pF with <10% duty-cycle distortion in 1MHz square-wave testing per datasheet Figure 5.

Does this device require external pull-up or pull-down resistors on unused inputs?

No. Unused inputs may be left floating only if VCC is applied and stable; however, STMicroelectronics recommends tying unused inputs to VCC or GND to prevent noise-induced switching. The internal input structure does not include weak pull-ups or pull-downs - external biasing is required for deterministic state control.

Is the 74LX1G02STR pin-compatible with other SOT23-5 logic gates?

Pinout matches standard SOT23-5 logic gate configuration (1A, 1B, GND, 1Y, VCC), but functional compatibility depends on logic type and voltage specs. It is not pin-compatible with inverters or AND gates sharing the same package, nor with devices lacking 5V-tolerant inputs like the 74LVC1G02 - direct substitution requires verification of input voltage range and output drive requirements.