74LVC126ABQ,115

Overview

The Nexperia 74LVC126ABQ,115 is a quad buffer/line driver with 3-state outputs controlled by active HIGH output enable inputs (nOE). It operates within a supply voltage range of 1.2 V to 3.6 V and features overvoltage tolerant inputs up to 5.5 V. The device includes Schmitt-trigger action at all inputs for tolerance of slower rise and fall times. It supports partial power down applications via IOFF circuitry to prevent backflow current. The component is housed in a DHVQFN14 package (SOT762-1) with dimensions of 2.5 x 3 x 0.85 mm.

Feature Summary

• Overvoltage tolerant inputs and outputs capable of handling voltages up to 5.5 V while operating on lower supply rails.
• Integrated IOFF circuitry enables partial power down mode, disabling outputs to prevent damaging backflow currents.
• Schmitt-trigger action at all input pins provides improved noise immunity and tolerance for slow signal transitions.

Applications

• Mixed 3.3 V and 5 V voltage translation environments
• Partial power down bus interface applications
• Buffering signals with slow rise and fall times

Procurement Notes

Verify the specific ordering suffix

Selection Notes

Select this part when a quad non-inverting buffer with 3-state control is required in a space-constrained design. The DHVQFN14 package offers a thermal enhanced leadless solution suitable for high-density PCB layouts. Ensure the application requires 5 V tolerant I/Os if interfacing with higher voltage logic levels while powered by 1.2 V to 3.6 V supplies.

Part Context

This component belongs to the 74LVC126A family of quad buffers with 3-state outputs. The 'ABQ' designation specifically identifies the DHVQFN14 (SOT762-1) package variant. Other variants in the family include SO14 and TSSOP14 packages, offering flexibility in thermal management and footprint requirements for different manufacturing constraints.

Replacement Considerations

Direct pin-compatible replacements include other 74LVC126A variants such as 74LVC126AD (SO14) or 74LVC126APW (TSSOP14), provided the package form factor change is acceptable for the PCB layout.

FAQ

How does the IOFF circuitry function in this device?

The IOFF circuitry disables the outputs when the device is powered down (VCC = 0 V), preventing potentially damaging backflow current through the device when driven by external voltage sources.

What is the maximum input voltage allowed for the 74LVC126ABQ?

The inputs are overvoltage tolerant and can accept voltages up to 5.5 V, even when the supply voltage (VCC) is as low as 1.2 V.