STMicroelectronics 74ACT02B

Overview

74ACT02B from STMicroelectronics is a quad 2-input NOR gate in plastic DIP-14 package, operating at 4.5–5.5 V with 5 ns typical propagation delay, ±24 mA symmetrical output drive, and TTL-compatible input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V). It interfaces high-speed CMOS systems with TTL/NMOS logic in industrial control timing and bus arbitration circuits.

For engineers reviewing the 74ACT02B datasheet, 74ACT02B pinout, 74ACT02B application, or 74ACT02B equivalent, key selection criteria include transmission-line driving capability (50 Ω), latch-up immunity, ESD tolerance (2 kV), and guaranteed propagation delay matching (tPLH ≅ tPHL) across temperature.

Technical Context

This device implements four independent NOR gates using sub-micron C2MOS technology with three-stage buffered outputs, delivering high noise immunity and stable switching. Its symmetrical output impedance (|IOH| = IOL ≥ 24 mA) and balanced propagation delays (tPLH ≅ tPHL) support clean signal integrity in bidirectional bus applications.

The input structure includes protection diodes enabling 2 kV HBM ESD immunity and compatibility with TTL, NMOS, and CMOS voltage levels. Operating range (−55°C to +125°C) and quiescent ICC ≤ 2 µA make it suitable for low-power, wide-temperature embedded logic interfacing.

Key Specifications

Pinout & Package

74ACT02B is supplied in a 14-pin plastic dual in-line package (DIP-14) with 2.54 mm lead pitch, 20.0 mm body length, and through-hole mounting. Pin 7 is GND; Pin 14 is VCC; inputs and outputs are arranged per standard 74-series layout.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74ACT02N, 74ACT02B offers identical electrical performance but distinct traceability and RoHS compliance documentation; versus 74VHC02N, it delivers 2× output drive and 30% faster propagation at the cost of narrower supply range and higher static current.

Availability

74ACT02B is available at Aetrix Electronics and suitable for industrial PLC input conditioning, legacy bus arbitration logic, and automotive body control modules requiring stable component supply across extended temperature and long-lifecycle programs.

Supply support for 74ACT02B 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 74ACT family targets high-speed, TTL-compatible CMOS logic interfacing - optimized for noise immunity, transmission-line drive, and wide-temperature reliability in mission-critical control systems.

FAQ

Is 74ACT02B pin-compatible with standard 74LS02?

Yes - 74ACT02B uses the same DIP-14 pinout and logic function as 74LS02, but with CMOS input structure, higher output drive (±24 mA vs. ±8 mA), and lower ICC (2 µA vs. 19 mA). No level-shifting is needed, though VCC must be 4.5–5.5 V.

Can 74ACT02B operate at 3.3 V?

No - 74ACT02B is not specified for 3.3 V operation. Its absolute minimum VCC is 4.5 V, and VIH/VIL thresholds are defined only for 4.5–5.5 V. For 3.3 V systems, consider 74LVC02 or 74AUP02 with appropriate voltage translation.

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

Per AC specifications, 74ACT02B is characterized up to 50 pF load capacitance with 500 Ω termination. Driving >100 pF may increase tPD beyond 8 ns and cause overshoot; for heavier loads, add series damping or buffer stages.

Does 74ACT02B require external pull-up or pull-down resistors on inputs?

No - inputs have CMOS structure with ±0.1 µA leakage and defined VIH/VIL thresholds. Floating inputs are not permitted; unused inputs must be tied to VCC or GND to prevent oscillation and excess current draw.