Nexperia USA Inc. 74LVTH125BQ,115

Overview

74LVTH125BQ,115 from Nexperia is a 3.3 V quad non-inverting 3-state buffer with bus-hold inputs and IOFF partial power-down capability, designed for high-speed TTL-compatible bus interfacing in industrial control and embedded computing systems. It features ±32 mA/±64 mA output drive, 2.7–3.6 V supply range, and overvoltage-tolerant inputs up to 5.5 V.

For engineers reviewing the 74LVTH125BQ,115 datasheet, 74LVTH125BQ,115 pinout, 74LVTH125BQ,115 application, or 74LVTH125BQ,115 equivalent, key selection criteria include 3-state timing (tPZH ≤ 4.7 ns), bus-hold current (IBHL = 75–150 μA), IOFF leakage (< ±100 μA at VCC = 0 V), and DHVQFN14 thermal performance for space-constrained PCB layouts.

Technical Context

This BiCMOS device implements four independent non-inverting buffers, each controlled by an active-low 3-state enable input (nOE). Its bus-hold circuitry actively maintains logic state on unused inputs without external pull-ups, reducing BOM count and layout complexity.

The IOFF feature disables outputs during power-down, blocking backflow current when VCC = 0 V and I/O pins are biased to 5 V - critical for hot-swap and multi-rail system interoperability. Input tolerance to 5.5 V enables direct connection to legacy 5 V buses while operating from a 3.3 V supply.

Key Specifications

Pinout & Package

DHVQFN14 (SOT762-1) package: 2.5 × 3.0 × 0.85 mm body, no leads, exposed thermal pad (non-soldered by default), 14 terminals in quad arrangement with terminal 1 index area.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC125APWR and 74ALVC125QX, the 74LVTH125BQ,115 uniquely combines 5.5 V input tolerance, IOFF, and ±64 mA drive in DHVQFN14 - making it the sole option for ruggedized 3.3 V/5 V mixed-signal bus interfaces requiring hot-swap safety and minimal BOM count.

Availability

74LVTH125BQ,115 is available at Aetrix Electronics and suitable for industrial PLC backplanes, embedded microcontroller bus expansion, automated test equipment signal conditioning, and medical diagnostic instrument data routing requiring stable component supply and long-term lifecycle assurance.

Supply support for 74LVTH125BQ,115 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

Nexperia is a global semiconductor expert focused on high-volume, high-reliability logic, analog, and MOSFET solutions, serving automotive, industrial, and consumer markets with ISO/TS 16949-certified manufacturing.

The 74LVTH series targets high-speed, mixed-voltage bus interface applications where robustness, low power, and small-footprint packaging are critical - especially in industrial automation and embedded computing.

FAQ

Can 74LVTH125BQ,115 operate reliably at 2.5 V supply?

No. The device is specified for 2.7 V to 3.6 V operation per Table 5. At 2.5 V, VOH drops below TTL HIGH threshold (2.0 V), IBHL falls outside guaranteed range, and tPLH increases beyond 4.5 ns - violating JEDEC JESD8C compliance. Operation below 2.7 V risks functional failure and is not characterized.

Is the thermal pad on SOT762-1 required to be soldered to ground?

No. Per Figure 5, the exposed pad has no electrical or mechanical requirement to be soldered. If connected, it must remain floating or be tied to GND - never to VCC or signal nets. Soldering improves thermal dissipation but is optional for nominal operation within −40 °C to +85 °C ambient.

Does bus-hold functionality work when VCC = 0 V?

No. Bus-hold circuitry requires VCC ≥ 2.7 V to activate. With VCC = 0 V, all inputs float and are unprotected; IOFF disables outputs, but inputs lack active termination. For true zero-power hold, external resistors or dedicated bus-hold ICs are required.

What is the maximum capacitive load this buffer can drive while maintaining 4 ns propagation delay?

Per Table 8 test conditions and Figure 6, the 4.0 ns tPLH max is validated with CL = 50 pF. Driving >50 pF increases delay nonlinearly - e.g., at 100 pF, tPLH exceeds 6 ns. For heavier loads, reduce trace length, add series termination, or use lower-capacitance PCB materials to stay within timing budget.