Texas Instruments SN74LVTH126DGVR

Overview

SN74LVTH126DGVR from Texas Instruments is a quad 3-state noninverting buffer designed for mixed-mode 3.3-V V_CC operation with 5-V tolerant inputs and outputs. It delivers 64 mA sink current, supports hot insertion via I_off and power-up 3-state, features bus-hold on all data inputs, and operates across −40°C to 85°C in TVSOP-14 packaging - used in voltage-level translation between 3.3-V logic and legacy 5-V buses.

For engineers reviewing the SN74LVTH126DGVR datasheet, SN74LVTH126DGVR pinout, SN74LVTH126DGVR application, or SN74LVTH126DGVR equivalent, key selection criteria include its 2.7–3.6 V supply range, TTL-compatible input thresholds (V_IL = 0.8 V, V_VIH = 2.0 V), 2.4 V minimum VOH at 32 mA, and guaranteed 3-state enable timing (t_PZH/t_PZL ≤ 7.1 ns).

Technical Context

This device implements four independent noninverting buffers, each with dedicated 3-state output control (OE) and active bus-hold circuitry on A inputs. The architecture enables stable signal routing without external pull resistors while maintaining compatibility with both 3.3-V LVTTL and 5-V TTL logic families.

It integrates I_off protection to block reverse current during power-down and power-up 3-state logic that forces outputs into high-impedance when V_CC is below 1.5 V - critical for hot-swap backplane and modular system designs requiring safe insertion under live bias.

Key Specifications

Pinout & Package

SN74LVTH126DGVR uses a 14-pin Thin Very Small Outline Package (TVSOP) with 0.5-mm lead pitch, 3.6-mm body width, and 1.2-mm max height - optimized for high-density PCB layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad 3-state buffer applications.

Compared with SN74LVC126APW and SN74AHCT126PW, the SN74LVTH126DGVR uniquely combines 5-V-tolerant I/O, integrated bus-hold, hot-insertion support, and 64 mA drive - making it the only option among the three qualified for mixed-voltage, high-reliability, and modular system applications.

Availability

SN74LVTH126DGVR is available at Aetrix Electronics and suitable for industrial backplanes, embedded controller bus extensions, modular test equipment, and automotive diagnostic interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SN74LVTH126DGVR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and connectivity technologies with over 50 years of innovation in industrial, automotive, and communications markets.

The SN74LVTH126DGVR belongs to TI's LVTTL family of advanced bus interface devices, engineered specifically for robust mixed-voltage signal translation and hot-plug reliability in mission-critical infrastructure systems.

FAQ

What is the maximum input voltage rating for SN74LVTH126DGVR?

The SN74LVTH126DGVR supports input voltages up to 5.5 V across its entire operating temperature range, enabling safe interfacing with 5-V TTL logic while powered from a 3.3-V supply. This 5-V tolerance is explicitly specified in the Absolute Maximum Ratings table and confirmed in the recommended operating conditions section of the SCBS746B datasheet.

Does SN74LVTH126DGVR require external pullup resistors on its inputs?

No, SN74LVTH126DGVR does not require external pullup or pulldown resistors because it integrates active bus-hold circuitry on all four data inputs (A1–A4). This feature maintains valid logic states on undriven or floating inputs, as confirmed in the device description and electrical characteristics (II(hold) = ±75 µA at V_CC = 3 V).

Can SN74LVTH126DGVR be used in hot-swap applications?

Yes, SN74LVTH126DGVR is explicitly designed for hot-insertion applications. Its I_off circuitry disables outputs during power-down to prevent backflow current, and its power-up 3-state logic ensures outputs remain high-impedance until V_CC stabilizes - both features validated per JESD 78 latch-up testing and documented in the "description/ordering information" section.

What is the thermal resistance (θ_JA) of the SN74LVTH126DGVR package?

The SN74LVTH126DGVR in its TVSOP-14 (DGV) package has a junction-to-ambient thermal resistance (θ_JA) of 127°C/W, as specified in the Absolute Maximum Ratings table. This value assumes standard JEDEC high-K test board conditions and informs PCB copper pour design for continuous 64 mA per output operation.

How many independent buffers does SN74LVTH126DGVR contain?

SN74LVTH126DGVR contains four independent noninverting 3-state buffers, each with dedicated output-enable (OE) control and data input (A). This is confirmed by the logic diagram, pinout diagram (showing 1OE/1A/1Y through 4OE/4A/4Y), and functional description stating "independent line drivers with 3-state outputs."