74HC9115D,118

Overview

The Nexperia 74HC9115D,118 is a nine-wide Schmitt trigger buffer featuring open-drain outputs. It operates within a supply voltage range of 2.0 V to 6.0 V and supports an ambient temperature range from -40 °C to +125 °C. The device utilizes SO-20 (SOT163-1) packaging. Propagation delay varies with voltage: at 2.0 V it ranges up to 115 ns, while at 6.0 V it reduces to approximately 19 ns. Static characteristics include input leakage current of ±1.0 μA maximum at 6.0 V and supply current of 160 μA maximum at 125 °C.

Feature Summary

• Schmitt trigger action on all data inputs transforms slowly changing signals into sharply defined jitter-free output signals.
• Open-drain outputs allow flexible interfacing and voltage level adaptation.
• Inputs include clamp diodes enabling interface to voltages exceeding VCC using current limiting resistors.
• High noise immunity and CMOS low power dissipation ensure reliable operation.

Applications

• Signal buffering for noisy environments requiring hysteresis
• Interface circuits where open-drain logic levels are necessary
• Systems utilizing slowly varying input waveforms

Procurement Notes

Verify the specific ordering suffix

Selection Notes

Select this component when nine buffered channels with Schmitt trigger inputs are required in a single package. The open-drain configuration necessitates external pull-up resistors for proper HIGH-level output generation. Ensure the application voltage falls within the 2.0 V to 6.0 V range and that the PCB layout accommodates the SO-20 footprint.

Part Context

This part belongs to the 74HC series of high-speed CMOS logic devices manufactured by Nexperia. It provides a specialized variant of standard buffers by incorporating Schmitt triggers and open-drain outputs, distinguishing it from standard push-pull HC buffers. The device is designed for general-purpose digital applications requiring robust signal conditioning.

Replacement Considerations

Direct replacements must match the 74HC logic family, nine-channel width, Schmitt trigger inputs, and open-drain outputs. Verify pin compatibility with the SO-20 package. Other manufacturers producing equivalent 74HC9115 specifications may serve as substitutes if electrical parameters align.

FAQ

How does the open-drain output affect the HIGH logic level?

The open-drain outputs do not actively drive HIGH; they only pull LOW. A HIGH state is achieved only when an external pull-up resistor connects the output to a voltage source.

What is the purpose of the clamp diodes on the inputs?

The input clamp diodes allow the device to interface with input voltages higher than the supply voltage (VCC), provided that current-limiting resistors are used to keep the clamping current within specified limits.