Texas Instruments SN74LVTH125PWR

Overview

SN74LVTH125PWR 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 supports hot insertion via I_off and power-up 3-state, features bus-hold on all data inputs, operates down to 2.7 V, and delivers 64 mA sink current per output - used in voltage-level translation between 3.3-V logic and legacy 5-V backplanes.

For engineers reviewing the SN74LVTH125PWR datasheet, SN74LVTH125PWR pinout, SN74LVTH125PWR application, or SN74LVTH125PWR equivalent, key selection considerations include its 14-pin TSSOP (PW) package, 3.3-V supply compatibility with 5-V signal tolerance, bus-hold input retention, hot-swap capability, and 4.9 ns typical enable/disable timing at 3.3 V.

Technical Context

The SN74LVTH125PWR implements four independent noninverting buffers, each with dedicated 3-state output-enable (OE) control. Its TTL-compatible input thresholds (V_IL = 0.8 V, V_VIH = 2.0 V) and 5-V-tolerant I/O allow seamless interfacing with both 3.3-V and 5-V systems without external level shifters.

Bus-hold circuitry actively maintains valid logic states on undriven inputs, eliminating need for external pullup/pulldown resistors. I_off protection disables outputs during power-down to prevent backflow current, while power-up 3-state ensures high-impedance outputs during V_CC ramp-up from 0 to 1.5 V.

Key Specifications

Pinout & Package

TSSOP-14 (PW) package: 4.4 mm × 5.0 mm body, 0.65 mm pitch, 1.2 mm max height, exposed pad optional per design - optimized for space-constrained PCB layouts with moderate thermal demands.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC125APWR and 74ALVC125PW, the SN74LVTH125PWR uniquely combines 5-V-tolerant I/O, integrated bus-hold, and hot-swap readiness - making it irreplaceable in mixed-voltage industrial backplanes requiring zero external components and guaranteed signal integrity during power transitions.

Availability

SN74LVTH125PWR is available at Aetrix Electronics and suitable for industrial automation interfaces, telecom backplane translation, and embedded system bus buffering requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for SN74LVTH125PWR 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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and communications markets.

The SN74LVTH125PWR belongs to TI's LVTH logic family, engineered specifically for robust 3.3-V operation with 5-V signal compatibility, targeting mixed-voltage system integration in harsh or mission-critical environments.

FAQ

What is the absolute maximum supply voltage for SN74LVTH125PWR?

The absolute maximum V_CC rating for SN74LVTH125PWR is 4.6 V. Operation above this voltage risks permanent device damage. The recommended operating range remains 2.7 V to 3.6 V per the datasheet, and sustained use at 4.6 V is not functional or reliable. Always observe derating guidelines for thermal and long-term reliability.

Does SN74LVTH125PWR require external pullup resistors on its inputs?

No, SN74LVTH125PWR does not require external pullup or pulldown resistors on its data inputs because it integrates active bus-hold circuitry. This feature maintains a valid logic state on undriven or floating inputs, reducing BOM count and layout complexity. Using external resistors with bus-hold is explicitly discouraged in the datasheet.

Can SN74LVTH125PWR safely interface with 5-V microcontrollers?

Yes, SN74LVTH125PWR can safely interface with 5-V microcontrollers: its inputs tolerate up to 7 V, and outputs drive 5-V TTL loads while powered from 3.3 V. This eliminates need for external level shifters. However, outputs are not 5-V powered - they swing from GND to V_CC (3.3 V) - so ensure receiving devices accept 3.3-V logic-high levels.

What is the thermal resistance (θ_JA) of SN74LVTH125PWR in its TSSOP package?

The junction-to-ambient thermal resistance (θ_JA) for SN74LVTH125PWR in the TSSOP (PW) package is 113°C/W under standard JEDEC test conditions. This value assumes a two-layer PCB with 1-in² copper pour; actual performance improves with enhanced thermal vias and larger copper areas connected to the power/ground pins.

Is SN74LVTH125PWR suitable for hot-swap applications?

Yes, SN74LVTH125PWR is explicitly designed for hot-swap applications. Its I_off circuitry disables outputs when V_CC = 0, preventing damaging back-current flow, and its power-up 3-state ensures outputs remain high-impedance until V_CC exceeds 1.5 V - both features validated per JESD standards for live insertion.