74HCT126N,652

Overview

The NXP USA Inc. 74HCT126N,652 is a quad buffer and line driver featuring three-state outputs controlled by active-high output enable inputs (nOE). It operates within a supply voltage range of 4.5 V to 5.5 V and supports an ambient temperature range from -40 °C to +125 °C. The device utilizes TTL-level input logic and includes input clamp diodes for interfacing with voltages exceeding VCC. It is housed in a 14-lead plastic dual in-line package (DIP14) conforming to the SOT27-1 outline.

Feature Summary

• Quad buffer/line driver architecture with independent high-level output enable control
• TTL-compatible input levels ensuring direct interface with Transistor-Transistor Logic systems
• Three-state outputs allowing connection to bus structures without signal contention
• Input clamp diodes enabling safe operation when interfacing with voltages higher than the supply rail

Applications

• Bus-oriented memory and data transmission applications
• Driving capacitive loads on printed circuit boards
• Interface buffering between different logic families
• Line driving for signal integrity maintenance over traces

Procurement Notes

Verify the specific ordering suffix against current manufacturer documentation to confirm package type and temperature grade. Confirm RoHS compliance status and lead-free material specifications prior to integration. Ensure the DIP14 package dimensions match the target footprint requirements. Validate that the HCT logic family aligns with existing system voltage and timing constraints.

Selection Notes

Select this component when TTL-level compatibility is required alongside CMOS drive strength. The HCT series ensures noise margins compatible with standard TTL inputs while maintaining low power consumption typical of CMOS technology. Verify that the operating temperature range meets the environmental conditions of the final application. Consider the propagation delay characteristics relative to the maximum clock frequency of the system design.

Part Context

This part belongs to the 74HCT126 family of quad buffers with 3-state outputs. It is manufactured using high-speed silicon-gate CMOS technology. The device is pin-compatible with other variants in the 74HC/HCT series, facilitating design flexibility across different logic speed and voltage requirements within the same product ecosystem.

Replacement Considerations

The 74HC126N serves as a CMOS-level alternative within the same package. Other manufacturers producing JEDEC-compliant 74HCT126 devices may offer functional equivalents. Verify pinout and electrical characteristics before substitution.