Nexperia USA Inc. 74HCT02DB,112

Overview

74HCT02DB,112 from Nexperia is a quad 2-input NOR gate logic IC with TTL-compatible inputs, 4.5 V to 5.5 V supply range, −40 °C to +125 °C operating temperature, and SO14 (SOT108-1) package. It delivers 11 ns typical propagation delay at 4.5 V, supports 4 mA output drive, and integrates input clamp diodes for overvoltage-tolerant interfacing in industrial control and digital signal routing applications.

For engineers reviewing the 74HCT02DB,112 datasheet, 74HCT02DB,112 pinout, 74HCT02DB,112 application, or 74HCT02DB,112 equivalent, key selection criteria include TTL-level input compatibility, SO14 thermal performance up to +125 °C, guaranteed 4.0 mA output sink/source capability, and JEDEC JESD7A compliance across 4.5–5.5 V operation.

Technical Context

This device implements four independent 2-input NOR gates using silicon-gate CMOS technology. Each gate features TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 5.0 V), enabling direct interface with legacy 5 V TTL logic families without level translation.

It operates within a strict 4.5–5.5 V supply window and guarantees rail-to-rail output swing (VOH ≥ 3.7 V, VOL ≤ 0.4 V at IO = ±4.0 mA), with input clamp diodes allowing safe connection to signals exceeding VCC when used with current-limiting resistors.

Key Specifications

Pinout & Package

74HCT02DB,112 uses the SO14 (SOT108-1) plastic small outline package: 14-lead, 3.9 mm body width, 1.27 mm lead pitch, and gull-wing surface-mount terminals. Thermal derating begins above 100 °C at 10.1 mW/K.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74HCT02DB,112, the 74HCT02D,118 offers identical logic behavior and thermal rating but optimizes for high-throughput placement, while SN74HCT02DR introduces measurable static power penalty without functional benefit-making the Nexperia variant preferred for thermally constrained or energy-sensitive implementations.

Availability

74HCT02DB,112 is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, digital power sequencing, legacy system bus arbitration, and test equipment signal conditioning requiring stable component supply across extended temperature ranges.

Supply support for 74HCT02DB,112 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

Nexperia is a leading Dutch semiconductor manufacturer specializing in high-performance logic, analog, and discrete components for industrial, automotive, and consumer applications.

The 74HCT logic family was designed specifically to bridge TTL and CMOS domains, delivering robust 5 V interoperability, low dynamic power, and extended temperature operation for mission-critical control systems.

FAQ

Is 74HCT02DB,112 compatible with 3.3 V microcontroller GPIO?

No. The 74HCT02DB,112 requires 4.5–5.5 V supply and has TTL-level inputs (VIH ≥ 2.0 V), but its outputs swing rail-to-rail at 5 V and are not 3.3 V tolerant. Direct connection to 3.3 V MCU I/O risks damage or undefined logic states; a level-shifting buffer or 74LVC-series device is required for mixed-voltage interfacing.

What is the maximum capacitive load this device can drive reliably?

At VCC = 4.5 V and Tamb = 25 °C, the 74HCT02DB,112 maintains specified propagation delay (≤24 ns max) and output voltage levels (VOH ≥ 3.7 V, VOL ≤ 0.4 V) into 50 pF loads. For heavier loads (>75 pF), transition times increase and noise margins degrade; add a 22 Ω series resistor at the output to dampen ringing without compromising timing.

Does this part support hot-swap or live-insertion?

No. The 74HCT02DB,112 lacks powered-off protection circuitry. Applying input signals before VCC stabilizes may forward-bias internal clamp diodes, causing excessive current flow and potential latch-up. Always sequence VCC before asserting any inputs, and use power-good monitoring in hot-swap systems.

Can unused NOR gate inputs be left floating?

No. Floating inputs cause increased ICC, erratic output states, and susceptibility to EMI. Tie all unused A and B inputs to either VCC or GND using 10 kΩ resistors. For unused gates, connect both inputs to GND and leave the output unconnected-this minimizes power consumption and prevents oscillation.