SN74LVTH126NSR

Buffers, Drivers, Receivers, Transceivers Overview

The SN74LVTH126NSR is a quad bus buffer featuring independent line drivers with 3-state outputs, manufactured by Texas Instruments. Designed for low-voltage 3.3-V VCC operation, it supports TTL interface compatibility within 5-V system environments. The device operates on an unregulated battery supply down to 2.7 V and includes active bus-hold circuitry on data inputs to eliminate external pullup or pulldown resistors. It provides Ioff and power-up 3-state support for hot-insertion applications. The component is housed in a 14-pin SOP (NS) package.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• Supports mixed-mode signal operation allowing 5-V input and output voltages with 3.3-V VCC
• Features active bus-hold circuitry on data inputs to maintain valid logic states without external resistors
• Provides Ioff and power-up 3-state functionality to prevent damaging current backflow during hot insertion
• Offers high ESD protection exceeding JESD 22 standards for human-body, machine model, and charged-device models

Buffers, Drivers, Receivers, Transceivers Applications

• Mixed-mode signal interfaces between 5-V systems and 3.3-V components
• Hot-insertion applications requiring controlled power-up and power-down states
• Unregulated battery-powered system designs operating down to 2.7 V
• Bus buffering where elimination of external pullup/pulldown resistors is required

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify the specific ordering suffix 'NSR' corresponds to the SOP-14 tape and reel packaging configuration. Confirm that the procurement matches the SN74LVTH126 family specifications rather than similar variants like LVTH374. Ensure compliance with RoHS requirements as indicated in the manufacturer's documentation. Cross-reference the part marking 'LVTH126' on the top side to validate authenticity against the official datasheet.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component when designing circuits that require driving buses with 3-state outputs while interfacing different voltage domains. It is suitable for applications needing robust ESD protection and latch-up performance exceeding 100 mA per JESD 78. Consider this part for designs prioritizing reduced component count by utilizing internal bus-hold features instead of external resistors. Ensure the operating temperature range of -40°C to 85°C aligns with the environmental requirements.

Buffers, Drivers, Receivers, Transceivers Part Context

This device belongs to the SN74LVTH126 series of quadruple bus buffers with 3-state outputs from Texas Instruments. It is part of the broader LVTH logic family designed for low-voltage applications. The NSR suffix indicates the specific SOP-14 package variant supplied in tape and reel format. It shares functional similarities with other bus buffers but is distinct in its specific voltage tolerance and bus-hold characteristics defined by the LVTH technology.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

SN74LVTH126DR

Buffers, Drivers, Receivers, Transceivers FAQ

How does the device handle unused or undriven inputs?

The SN74LVTH126NSR features active bus-hold circuitry on its data inputs, which holds them at a valid logic state. This eliminates the need for external pullup or pulldown resistors.

What is the function of the Ioff circuitry in this component?

The Ioff circuitry disables the outputs when VCC is between 0 and 1.5 V, preventing damaging current backflow through the device during power-down or hot-insertion scenarios.

Can this buffer operate with 5-V inputs despite being a 3.3-V device?

Yes, the SN74LVTH126NSR is specifically designed to support mixed-mode signal operation, allowing it to accept 5-V input voltages while operating with a 3.3-V VCC supply.