SN74LVTH126D

Buffers, Drivers, Receivers, Transceivers Overview

The SN74LVTH126D is a quadruple bus buffer with 3-state outputs manufactured by Texas Instruments. It operates within a supply voltage range of 2.7 V to 3.6 V and supports mixed-mode signal operation, allowing 5-V input and output voltages with 3.3-V VCC. The device features independent line drivers where each output enters a high-impedance state when the associated output-enable (OE) input is low. Active bus-hold circuitry maintains unused or undriven inputs at valid logic states without external resistors. It provides TTL interface capability to 5-V system environments.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• Supports mixed-mode signal operation for interfacing 5-V systems with 3.3-V VCC
• Features active bus-hold circuitry on data inputs to eliminate external pullup/pulldown resistors
• Provides Ioff and power-up 3-state support for safe hot-insertion applications
• Includes latch-up protection exceeding 100 mA per JESD 78, Class II

Buffers, Drivers, Receivers, Transceivers Applications

• Mixed-mode signal operation between 5-V and 3.3-V systems
• Unregulated battery operation down to 2.7 V
• Hot-insertion applications utilizing Ioff and power-up 3-state features

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify the specific package type and ordering suffix against the manufacturer's current documentation before procurement. Confirm that the SN74LVTH126D designation corresponds to the SOIC tube packaging variant. Ensure compatibility with the required operating temperature range of -40°C to 85°C. Cross-reference the RoHS status and lead finish specifications with the latest package addendum to meet assembly requirements.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component when a quadruple non-inverting buffer with 3-state outputs is required for 3.3-V logic systems interfacing with 5-V environments. The SOIC package is suitable for surface-mount applications requiring standard pin spacing. Consider the active bus-hold feature if external pullup or pulldown resistors are undesirable. Verify that the supply voltage remains within the 2.7 V to 3.6 V range for optimal performance.

Buffers, Drivers, Receivers, Transceivers Part Context

The SN74LVTH126D belongs to the LVTH logic family from Texas Instruments, designed specifically for low-voltage 3.3-V operations while maintaining TTL compatibility. It is part of a broader series of bus buffers that include variants like the SN74LVTH125 and SN74LVTH126DR. The 'D' suffix indicates the SOIC package format, distinguishing it from tape-and-reel options such as the DR or DBR variants.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

SN74LVTH126DR

Buffers, Drivers, Receivers, Transceivers FAQ

How does the device handle unused inputs?

Active bus-hold circuitry holds unused or undriven inputs at a valid logic state, eliminating the need for external pullup or pulldown resistors.

What is the function of the OE input?

When the output-enable (OE) input is low, the associated output enters a high-impedance state. When OE is high, the output follows the A input.

Does the device support hot insertion?

Yes, the device is fully specified for hot-insertion applications using Ioff and power-up 3-state circuitry to prevent damaging current backflow and driver conflicts.