STMicroelectronics 74LCX02MTR

Overview

74LCX02MTR from STMicroelectronics is a low-voltage CMOS quad 2-input NOR gate in SO-14 package, operating from 2.0V to 3.6V, with 5V-tolerant inputs, 4.4ns max propagation delay at 3V, ±24mA output drive, and symmetrical output impedance. It enables 3.3V logic interfacing with legacy 5V systems in PCI bus-compatible digital control circuits.

For engineers reviewing the 74LCX02MTR datasheet, 74LCX02MTR pinout, 74LCX02MTR application, or 74LCX02MTR equivalent, key selection criteria include 5V input tolerance, sub-5ns propagation delay at 3V, rail-to-rail output swing under 24mA load, and SO-14 footprint compatibility with standard 74-series logic layouts.

Technical Context

The 74LCX02MTR implements four independent NOR gates using sub-micron C2MOS technology, supporting mixed-voltage system design via 5V-tolerant inputs while powered solely from 2.0–3.6V VCC. Its balanced tPLH/tPHL delays (≤4.4ns) and matched |IOH|/IOL (≥24mA at VCC = 3V) ensure deterministic timing and robust drive capability across all four channels.

Input protection includes ESD immunity >2000V HBM and power-down safe I/O structures that prevent current backflow when VCC = 0V. The device guarantees PCI bus signal levels at 24mA sink/source and meets JESD17 latch-up immunity (>500mA), making it suitable for hot-swap-capable 3.3V logic interfaces.

Key Specifications

Pinout & Package

74LCX02MTR is housed in a 14-pin SOIC (SO-14) package per JEDEC MS-012, with 1.27mm pitch, 8.55–8.75mm body length, and ECOPACK® lead-free construction.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad 2-input NOR gate applications.

Compared with 74LCX02MTR, both alternatives offer faster typical propagation delay but sacrifice 5V input tolerance - a critical requirement for mixed-voltage industrial and legacy-system integration where external level translation adds cost and board space.

Availability

74LCX02MTR is available at Aetrix Electronics and suitable for industrial PLC I/O modules, PCI add-in card logic, handheld UI controllers, and automotive body control gateways requiring stable component supply across extended temperature ranges (–40°C to +85°C).

Supply support for 74LCX02MTR 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 74LCX logic family was engineered specifically for high-speed, low-voltage 3.3V system interfacing with backward compatibility to 5V environments - targeting PCI, embedded control, and mixed-signal board-level integration.

FAQ

Can 74LCX02MTR operate with VCC = 2.3V and still meet 5V input tolerance?

Yes. Per Table 4 (Recommended Operating Conditions), VI input voltage range is guaranteed 0V to 5.5V across the full VCC operating range (2.0V to 3.6V). At VCC = 2.3V, inputs remain fully 5V-tolerant, and DC specifications including VIH/VIL thresholds are maintained per Table 5.

Does 74LCX02MTR require external pull-up or pull-down resistors on unused inputs?

No. Unused inputs may be tied directly to VCC or GND. The device features integrated input protection diodes and low input leakage (±5µA), eliminating risk of floating node oscillation or excessive current draw. Tying to VCC or GND also prevents unintended logic transitions during power-up.

What is the maximum capacitive load this device can drive while maintaining 4.4ns propagation delay?

The 4.4ns max tPD is specified at CL = 50pF (Table 7). Driving loads >50pF increases propagation delay linearly due to RC time constant effects; for example, at CL = 100pF, measured tPD increases to ~6.8ns. For loads exceeding 50pF, buffer staging or reduced fanout is recommended.

Is 74LCX02MTR compatible with lead-free reflow soldering profiles?

Yes. As an ECOPACK® device, 74LCX02MTR supports standard lead-free reflow per JEDEC J-STD-020, with peak temperature up to 260°C for 30 seconds. The SO-14 package's mechanical data sheet (page 9) confirms compliance with IPC/JEDEC J-STD-020D moisture sensitivity level MSL3.