74HCT125D/AU118

Overview

The Nexperia 74HCT125D/AUJ is a quad buffer and line driver featuring three-state outputs controlled by active-low output enable inputs. It operates within a supply voltage range of 4.5 V to 5.5 V, utilizing TTL input levels for compatibility with standard logic families. The device provides non-inverting signal transmission across four independent channels. It is housed in an SOIC-14 plastic small outline package (SOT108-1) designed for surface-mount applications. The component supports industrial temperature ranges from -40 °C to +125 °C.

Feature Summary

• Features three-state outputs that assume a high-impedance OFF-state when the output enable input is HIGH.
• Includes input clamp diodes to allow interfacing with voltages exceeding VCC using current-limiting resistors.
• Provides high noise immunity and low power dissipation characteristics typical of CMOS technology.
• Offers robust ESD protection exceeding 2000 V via Human Body Model and 1000 V via Charged Device Model.

Applications

• Bus-oriented systems requiring data isolation and multi-device sharing.
• Clock distribution networks for buffering timing signals.
• Memory address and data bus drivers in digital circuits.
• Line termination and signal conditioning for long-distance transmission.

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm the exact package type and tape-and-reel specifications. Confirm RoHS compliance status and moisture sensitivity level requirements prior to integration into the manufacturing process. Ensure the selected variant matches the required operating temperature range for the intended application environment.

Selection Notes

Select this component when TTL-compatible input thresholds are required alongside CMOS drive capabilities. The 74HCT125 series is suitable for designs needing isolated bidirectional bus control or unidirectional buffering with defined high-impedance states. Consider the SOIC-14 package dimensions for PCB layout constraints and thermal management requirements relative to total power dissipation limits.

Part Context

This part belongs to the 74HCT125 family of quad buffers and line drivers manufactured by Nexperia. It is functionally compatible with other industry-standard 74HCT125 devices but may differ in packaging options such as TSSOP or SSOP. The D suffix indicates the SOIC-14 package configuration, distinguishing it from other physical form factors available within the same logical product line.

Replacement Considerations

Direct pin-compatible substitutes include the 74HCT125PW (TSSOP-14) and 74HCT125DB (SSOP-14) from Nexperia. Cross-manufacturer equivalents must be verified for identical logic levels, output drive strength, and electrical characteristics to ensure functional parity without circuit modification.

FAQ

How does the output enable input affect the state of the outputs?

When the output enable input (nOE) is HIGH, all outputs enter a high-impedance OFF-state regardless of the input signals. When nOE is LOW, the outputs follow the input signals in a non-inverting manner.

What is the purpose of the input clamp diodes?

The input clamp diodes allow the use of current-limiting resistors to interface the inputs to voltages higher than the supply voltage (VCC), providing flexibility in voltage translation scenarios.

Does this device support automotive applications?

No, unless explicitly stated otherwise in the datasheet, this product is not automotive qualified. It has not been tested according to automotive standards and should not be used in life-critical or safety-critical systems.