74AC02B

Overview

The STMicroelectronics 74AC02B is a Quad 2-Input NOR gate fabricated using sub-micron silicon gate and double-layer metal wiring C2MOS technology. It operates within a supply voltage range of 2V to 6V, with recommended conditions between 2V and 6V. At VCC = 5V, the typical propagation delay is 4.2ns. The device features symmetrical output impedance with minimum currents of |IOH| = IOL = 24mA. Quiescent supply current is typically 2μA at 25°C. Input leakage current is ±1μA at 5.5V. Power dissipation capacitance is 46pF at 10MHz.

Feature Summary

• Advanced high-speed CMOS logic utilizing sub-micron silicon gate and double-layer metal wiring technology for enhanced performance.
• High noise immunity with input levels defined as 28% of VCC minimum, ensuring stable operation in noisy environments.
• Capable of driving 50Ω transmission lines with symmetrical output impedance and balanced propagation delays.
• Integrated protection circuits against static discharge providing 2KV ESD immunity and transient excess voltage tolerance.

Applications

• Digital signal processing systems requiring fast NOR logic operations
• Data acquisition equipment needing high noise immunity
• Industrial control systems operating with 50Ω transmission line interfaces

Procurement Notes

Verify the specific package variant (DIP, SOP, or TSSOP) required for your design, as ordering codes differ by form factor. Confirm that the component meets RoHS compliance standards if applicable to your manufacturing region. Ensure that the operating temperature range of -55°C to +125°C aligns with your system's environmental requirements before finalizing procurement.

Selection Notes

Select this component when high-speed logic performance is critical, specifically where propagation delays around 4.2ns are necessary. It is suitable for designs requiring robust noise immunity and the ability to drive transmission lines directly. Consider the available packages (DIP-14, SO-14, TSSOP-14) based on your PCB layout constraints and assembly methods.

Part Context

This part belongs to the 74AC series of advanced high-speed CMOS logic devices. It maintains pin and function compatibility with the standard 74 series 02 NOR gates while offering significantly improved speed and lower power consumption. The AC series represents an evolution in CMOS technology, providing better performance metrics compared to older HC or HCT families.

Replacement Considerations

Check datasheets for other 74AC02 variants from different manufacturers to ensure pinout and electrical characteristics match. Verify that any substitute supports the same 2V to 6V operating voltage range and offers comparable propagation delay specifications for high-speed applications.