SN74AHC05DR

Overview

The SN74AHC05DR is a hex inverter with open-drain outputs manufactured by Texas Instruments. It operates within a supply voltage range of 2 V to 5.5 V and supports an operating temperature range from -40°C to +85°C. The device implements the Boolean function Y = A bar using CMOS technology. It features latch-up performance exceeding 250 mA per JESD 17 and ESD protection ratings of 2000 V (Human-Body Model), 200 V (Machine Model), and 1000 V (Charged-Device Model). The component is housed in a 14-pin SOIC package.

Feature Summary

• Contains six independent inverters performing logical inversion functions
• Outputs are configured as open-drain, requiring external pullup resistors for proper operation
• Supports wired-OR or wired-AND logic configurations when connected to other open-drain outputs
• Provides high electrostatic discharge protection capabilities

Applications

• Implementing active-low wired-OR logic functions
• Implementing active-high wired-AND logic functions
• General-purpose signal inversion in digital circuits

Procurement Notes

Verify the specific ordering suffix 'DR' corresponds to the SOIC tape-and-reel packaging configuration. Confirm that the required operating temperature range aligns with the specified -40°C to +85°C limits. Ensure external pullup resistors are included in the design, as the open-drain outputs cannot drive high levels internally. Check current status as NRND (Not Recommended for New Designs) on official documentation.

Selection Notes

Select this component when a hex inverter with open-drain capability is required for wired logic applications. The AHC logic family offers compatibility with standard CMOS interfaces while supporting a wide 2-V to 5.5-V supply range. Consider the 14-pin SOIC package dimensions for PCB layout constraints. Verify input transition rates against application requirements to ensure correct switching characteristics.

Part Context

This part belongs to the SN74AHC05 series of hex inverters with open-drain outputs. It is part of the broader AHC logic family designed for low power consumption and high-speed operation. The device serves as a fundamental building block for digital logic systems requiring inversion and bus driving capabilities through open-drain configurations.

Replacement Considerations

SN74AHC05DBR (SSOP package)

FAQ

Why are external pullup resistors required?

The outputs are open-drain, meaning they can only sink current to ground. They lack internal circuitry to source current, so external pullup resistors are necessary to establish a high logic level.

Can multiple outputs be connected together?

Yes, because the outputs are open-drain, they can be connected to implement active-low wired-OR or active-high wired-AND functions without conflict.