Texas Instruments SN74LVTH125DRE4

Overview

SN74LVTH125DRE4 from Texas Instruments is a quad 3-state noninverting 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, and featuring bus-hold on all data inputs to eliminate external resistors. It enables hot insertion in backplane or modular systems via I_off and power-up 3-state logic.

For engineers reviewing the SN74LVTH125DRE4 datasheet, SN74LVTH125DRE4 pinout, SN74LVTH125DRE4 application, or SN74LVTH125DRE4 equivalent, this page delivers verified electrical specs, SOIC-14 package details, timing characteristics at 3.3 V, bus-hold behavior, and real-world substitution guidance for industrial control and legacy interface bridging.

Technical Context

The SN74LVTH125DRE4 implements four independent noninverting buffers, each with dedicated 3-state output-enable (OE) control. Its bus-hold circuitry actively maintains valid logic states on undriven inputs without external biasing, reducing BOM count and layout complexity.

It supports true hot-swap operation: I_off blocks current backflow when powered down, while power-up 3-state ensures outputs remain high-impedance during V_CC ramp-up (≤200 µs/V), preventing bus contention in live-insertion systems.

Key Specifications

Pinout & Package

SN74LVTH125DRE4 uses a 14-pin SSOP (DB) package: 1.95 mm body width, 1.0 mm max height, 0.65 mm lead pitch, JEDEC MO-150 compliant. Pin 1 index located at top-left corner with beveled edge marking.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC125DR and SN74LVCH125DR, the SN74LVTH125DRE4 uniquely combines bus-hold, hot-swap readiness (I_off + power-up 3-state), and 5-V tolerant inputs-making it the only option for unattended industrial backplane expansion without redesign.

Availability

SN74LVTH125DRE4 is available at Aetrix Electronics and suitable for industrial automation, test equipment, and embedded communications requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for SN74LVTH125DRE4 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 personal electronics markets.

The SN74LVTH125DRE4 belongs to TI's LVTH logic family, engineered specifically for robust mixed-voltage interfacing in harsh environments where reliability, hot-swap capability, and bus-hold stability are critical design requirements.

FAQ

What is the maximum input voltage rating for SN74LVTH125DRE4?

The SN74LVTH125DRE4 supports input voltages from −0.5 V to 7 V, allowing direct connection to 5-V TTL sources while operating from a 3.3-V supply. This eliminates the need for external level-shifting circuitry and ensures compatibility with legacy logic families without risk of damage under normal operating conditions.

Does SN74LVTH125DRE4 require external pull-up or pull-down resistors on its inputs?

No, SN74LVTH125DRE4 integrates active bus-hold circuitry on all data inputs (1A–4A), which maintains a valid logic state when inputs are floating or undriven. Using external resistors with bus-hold is explicitly discouraged in the datasheet, as it may cause excessive current draw or metastability.

Can SN74LVTH125DRE4 be used in hot-swap applications?

Yes, SN74LVTH125DRE4 is fully specified for hot-insertion use via dual protection features: I_off disables outputs and prevents backflow current when V_CC = 0, and power-up 3-state ensures outputs remain high-impedance during V_CC ramp-up (≤200 µs/V), avoiding bus contention in live systems.

What is the typical propagation delay of SN74LVTH125DRE4 at 3.3 V?

The typical propagation delay (t_PLH/t_PHL) of SN74LVTH125DRE4 is 2 ns at V_CC = 3.3 V and CL = 50 pF. Measured values range from 1 ns (min) to 3.5 ns (max), supporting reliable operation in 100-MHz-capable digital paths with adequate timing margin.

Which package type does SN74LVTH125DRE4 use, and what are its key mechanical dimensions?

SN74LVTH125DRE4 uses the SSOP-14 (DB) package: 1.95 mm body width, 1.0 mm maximum height, 0.65 mm lead pitch, and JEDEC MO-150 compliant. Its compact footprint and gull-wing leads support automated assembly and high-density PCB layouts in space-constrained industrial modules.