Texas Instruments SN74LVTH125IPWREP

Overview

SN74LVTH125IPWREP from Texas Instruments is a quad 3-state noninverting bus buffer designed for mixed-voltage system interfacing, supporting 5-V TTL inputs/outputs with 3.3-V V_CC, operating down to 2.7 V, featuring bus-hold on all data inputs and I_off/power-up 3-state for hot insertion in backplane or modular systems.

For engineers reviewing the SN74LVTH125IPWREP datasheet, SN74LVTH125IPWREP pinout, SN74LVTH125IPWREP application, or SN74LVTH125IPWREP equivalent, key selection criteria include its 3.3-V supply compatibility with 5-V signal tolerance, guaranteed 2.7–3.6-V operation, bus-hold elimination of external resistors, ±100 µA I_off, and TSSOP-14 packaging for high-density board layouts.

Technical Context

This device implements four independent noninverting buffers, each with active-low 3-state enable (OE), enabling selective bus isolation. Its bus-hold circuitry maintains valid logic states on undriven A inputs without external components, and I_off protection ensures no current backflow when V_CC = 0.

The SN74LVTH125IPWREP uses TTL-compatible input thresholds (V_IL = 0.8 V, V_VIH = 2.0 V) while operating at 3.3-V V_CC, delivering VOH ≥ 2.4 V at I_OH = −8 mA and VOL ≤ 0.5 V at I_OL = 64 mA - enabling robust drive into terminated or capacitive loads in industrial control backplanes.

Key Specifications

Pinout & Package

TSSOP-14 package (PW), 5.0 mm × 6.4 mm body, 0.65 mm pitch, thin profile (1.2 mm max height), lead-free (NiPdAu), MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC125APWRE4 and SN74AHCT125PWRE4, the SN74LVTH125IPWREP uniquely combines 3.3-V operation, 5-V signal tolerance, integrated bus-hold, and I_off-enabled hot insertion - making it the sole option for robust, resistor-free, mixed-voltage backplane buffering in extended-temperature industrial systems.

Availability

SN74LVTH125IPWREP is available at Aetrix Electronics and suitable for industrial backplane interfaces, modular PLC carriers, automated test equipment fixtures, and avionics data acquisition nodes requiring stable component supply across extended temperature and long-lifecycle programs.

Supply support for SN74LVTH125IPWREP 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 logic solutions, with decades of heritage in industrial-grade interface ICs and automotive-qualified components.

The SN74LVTH125IPWREP belongs to TI's enhanced-product (EP) logic family, engineered for high-reliability applications demanding extended temperature range, controlled baseline manufacturing, and full DMS support - targeting aerospace, defense, and critical infrastructure systems.

FAQ

What is the minimum V_CC required for functional operation of the SN74LVTH125IPWREP?

The SN74LVTH125IPWREP is fully specified from 2.7 V to 3.6 V per recommended operating conditions. Below 2.7 V, outputs enter undefined behavior; however, the device enters high-impedance state when V_CC drops below 1.5 V during power-down. For guaranteed operation, maintain V_CC ≥ 2.7 V. The SN74LVTH125IPWREP supports unregulated battery rails down to this threshold without external regulation.

Does the SN74LVTH125IPWREP require external pullup or pulldown resistors on its A inputs?

No - the SN74LVTH125IPWREP integrates active bus-hold circuitry on all four A inputs, maintaining valid logic states on undriven or floating inputs without external components. Using pullup or pulldown resistors with the SN74LVTH125IPWREP is explicitly discouraged in the datasheet, as it may interfere with bus-hold current compliance and increase power consumption unnecessarily.

Can the SN74LVTH125IPWREP safely interface between a 3.3-V microcontroller and a 5-V peripheral without level-shifting circuitry?

Yes - the SN74LVTH125IPWREP accepts 5-V TTL input voltages (VI up to 7 V) while operating from a 3.3-V V_CC, and its outputs drive 5-V logic levels (VOH ≥ 2.4 V at −8 mA). This dual-voltage capability allows direct connection between 3.3-V controllers and 5-V peripherals, eliminating discrete level translators. The SN74LVTH125IPWREP achieves this via optimized input clamp structures and rail-to-rail output swing design.

What hot-insertion protections does the SN74LVTH125IPWREP provide, and how are they implemented?

The SN74LVTH125IPWREP provides two complementary hot-insertion protections: I_off circuitry disables outputs when V_CC = 0, preventing damaging current backflow; and power-up 3-state forces outputs into high-impedance during V_CC ramp-up/down, avoiding bus contention. These features are intrinsic to the silicon design and require no external configuration - confirmed by TI's enhanced product qualification testing per JESD22 and HAST protocols for the SN74LVTH125IPWREP.

Is the SN74LVTH125IPWREP pin-compatible with standard SN74LVTH125 variants?

Yes - the SN74LVTH125IPWREP uses the same TSSOP-14 (PW) package and identical pinout as the commercial SN74LVTH125PWR and SN74LVTH125PWRE4, including pin 1 (1OE), pin 2 (1A), pin 3 (1Y), and so on. All electrical and timing specifications align with the base LVTH125 family, with added EP-level reliability enhancements - making the SN74LVTH125IPWREP a drop-in replacement where extended temperature, controlled baseline, and DMS support are required.