Texas Instruments SN74LVTH125PW

Overview

SN74LVTH125PW from Texas Instruments is a quad 3-state noninverting buffer designed for mixed-voltage bus interfacing between 3.3-V logic and 5-V TTL systems. It operates from 2.7 V to 3.6 V, supports hot insertion via Ioff and power-up 3-state, features bus-hold on all data inputs, and delivers 64 mA sink current per output at VCC = 3 V - used in industrial backplane interface and FPGA I/O expansion.

For engineers reviewing the SN74LVTH125PW datasheet, SN74LVTH125PW pinout, SN74LVTH125PW application, or SN74LVTH125PW equivalent, key selection criteria include its 3.3-V VCC compatibility with 5-V tolerant inputs, 14-pin TSSOP (PW) package thermal resistance of 113°C/W, bus-hold elimination of external resistors, and guaranteed 4.2 ns typical propagation delay (tPLH) under 50-pF load.

Technical Context

The SN74LVTH125PW implements four independent noninverting buffers, each with an active-low 3-state output-enable control (OE). Its bus-hold circuitry actively maintains valid logic states on undriven inputs without external pull resistors, reducing BOM count and layout complexity.

Designed for hot-insertion environments, it integrates Ioff protection to block reverse current flow when powered down and power-up 3-state logic that forces outputs into high-impedance during VCC ramp-up/down - critical for live-swap backplane and modular system designs.

Key Specifications

Pinout & Package

TSSOP-14 (PW) package: 4.4 mm × 5.0 mm body, 0.65 mm lead pitch, 1.2 mm max height, exposed pad not present, JEDEC MO-153 compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad noninverting buffer applications.

Compared with SN74LVC125APW and SN74AHCT125PW, the SN74LVTH125PW uniquely combines 3.3-V operation, 5-V input tolerance, bus-hold, and Ioff - making it the sole option for robust hot-pluggable mixed-voltage buffering without design compromises.

Availability

SN74LVTH125PW is available at Aetrix Electronics and suitable for industrial backplane interface, FPGA I/O expansion, and hot-swappable module control requiring stable component supply across extended temperature ranges (−40°C to 85°C).

Supply support for SN74LVTH125PW 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 solutions for industrial, automotive, and communications markets.

The SN74LVTH125PW belongs to TI's LVTH logic family, engineered specifically for reliable mixed-voltage bus interfacing in harsh environments where hot insertion, latch-up immunity, and input state retention are mission-critical.

FAQ

What is the maximum recommended supply voltage for SN74LVTH125PW?

The absolute maximum supply voltage for SN74LVTH125PW is 4.6 V, but the recommended operating range is strictly 2.7 V to 3.6 V. Operation above 3.6 V risks exceeding internal voltage ratings and may cause premature wear or functional failure. All electrical specifications - including output drive, propagation delay, and bus-hold behavior - are guaranteed only within the 2.7–3.6 V window per the SCBS703I datasheet.

Does SN74LVTH125PW require external pullup resistors on its inputs?

No, SN74LVTH125PW does not require external pullup or pulldown resistors on its data inputs because it integrates active bus-hold circuitry. This feature maintains valid logic states on unused or undriven inputs, eliminating BOM cost and PCB space overhead. Using external resistors with SN74LVTH125PW is explicitly discouraged in the datasheet as it may interfere with bus-hold current compliance and increase power consumption.

Can SN74LVTH125PW be used in hot-swap applications?

Yes, SN74LVTH125PW is fully specified for hot-insertion applications using both Ioff and power-up 3-state technologies. The Ioff circuitry disables outputs when VCC = 0, preventing damaging current backflow, while the power-up 3-state function forces outputs into high-impedance during VCC ramp-up/down. These features are validated per JEDEC standards and make SN74LVTH125PW suitable for live-swap backplane and modular system designs.

What is the thermal resistance (θJA) of SN74LVTH125PW in its TSSOP package?

The junction-to-ambient thermal resistance (θJA) of SN74LVTH125PW in the TSSOP-14 (PW) package is 113°C/W, as specified in the SCBS703I datasheet. This value assumes standard JEDEC 2-layer board conditions (1-inch² copper pad, 2 oz Cu). For higher-power applications or enclosed environments, derating curves in the datasheet must be applied to ensure junction temperature remains below 150°C under worst-case ambient and load conditions.

How many independent buffers does SN74LVTH125PW contain, and what is their logic function?

SN74LVTH125PW contains four independent noninverting 3-state buffers. Each buffer has one data input (A), one active-low output-enable input (OE), and one output (Y). When OE is low, Y follows A (noninverting); when OE is high, Y enters high-impedance state. This architecture enables flexible bus arbitration, multiplexing, and isolation in multi-master digital systems - confirmed by the logic diagram and function table in the SCBS703I datasheet.