NXP Semiconductors 74LVT125PW/AUJ

Overview

74LVT125PW/AUJ from Nexperia is a 3.3 V quad non-inverting buffer with 3-state outputs, designed for high-speed bus interface applications in industrial and telecom systems. It features bus-hold inputs (eliminating external pull-ups), IOFF partial power-down protection, ±32 mA/64 mA output drive, and 5.5 V overvoltage-tolerant inputs. Its TSSOP14 package supports dense PCB layouts requiring low-profile, high-pin-count logic buffering.

For engineers reviewing the 74LVT125PW/AUJ datasheet, 74LVT125PW/AUJ pinout, 74LVT125PW/AUJ application, or 74LVT125PW/AUJ equivalent, key selection criteria include 3-state timing (tPZH ≤ 4.7 ns), bus-hold current (IBHH = –75 to –150 μA), IOFF leakage (< ±100 μA at VCC = 0 V), and compatibility with TTL-level inputs while operating from 2.7–3.6 V.

Technical Context

This BiCMOS device implements four independent non-inverting buffers, each controlled by an active-low output enable (nOE) input. The IOFF circuit disables outputs during power-down to prevent backflow current, and bus-hold circuitry maintains valid logic states on unused inputs without external resistors.

It operates across –40 °C to +85 °C with guaranteed propagation delays: tPLH/tPHL ≤ 4.0 ns (VCC = 3.0–3.6 V), tPZH/tPLZ ≤ 5.1 ns, and tPZL/tPHZ ≤ 4.7 ns. Input thresholds meet TTL compatibility (VIH ≥ 2.0 V, VIL ≤ 0.8 V), and outputs tolerate 5.5 V regardless of VCC.

Key Specifications

Pinout & Package

TSSOP14 (SOT402-1): plastic thin shrink small outline package, 14-lead, 4.4 mm body width, 0.65 mm pitch, 0.85 mm max height - optimized for automated assembly and thermal performance in space-constrained designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74LVT125PW/AUJ, the 74LVT125PW,118 offers identical performance and reliability with alternate logistics coding, while SN74LVC125APW sacrifices bus-hold, IOFF, and drive strength for lower static current - making it unsuitable for partial power-down or 5 V-tolerant bus isolation.

Availability

74LVT125PW/AUJ is available at Aetrix Electronics and suitable for industrial PLC backplanes, telecom line card interfaces, test equipment signal routing, and automated test fixture control requiring stable component supply, long-term lifecycle support, and consistent parametric performance.

Supply support for 74LVT125PW/AUJ 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 discrete components - delivering scalable solutions for automotive, industrial, and consumer markets.

The 74LVT125PW/AUJ belongs to Nexperia's LVT (Low-Voltage TTL) logic family, engineered specifically for 3.3 V systems demanding TTL-compatible interfacing, robust bus-hold, and partial power-down capability in harsh industrial environments.

FAQ

What is the maximum input voltage rating for 74LVT125PW/AUJ?

The 74LVT125PW/AUJ supports input voltages up to +5.5 V regardless of VCC level, enabling direct connection to 5 V TTL outputs without level-shifting circuitry. This overvoltage tolerance is guaranteed across the full operating temperature range (–40 °C to +85 °C) and does not require VCC to be powered for safe input application - critical for mixed-voltage system interoperability and hot-swap resilience.

Does 74LVT125PW/AUJ include bus-hold functionality, and how does it affect unused inputs?

Yes, 74LVT125PW/AUJ integrates bus-hold circuitry on all data inputs (pins 2, 5, 9, 12). When an input floats, IBHH (–75 to –150 μA) actively holds it at a valid HIGH logic state, and IBHL (+75 to +150 μA) holds it LOW - eliminating external pull-up/pull-down resistors. This reduces BOM cost, PCB area, and potential noise coupling, especially in modular backplane or test fixture designs with variable slot configurations.

How does the IOFF feature of 74LVT125PW/AUJ protect the device during partial power-down?

The IOFF circuit in 74LVT125PW/AUJ disables all outputs and limits power-off leakage current to ±100 μA when VCC = 0 V, preventing damaging backflow current through the device when other system rails remain active. This enables safe live insertion/extraction in modular systems and supports reliable power sequencing in multi-rail industrial controllers - a key requirement not met by standard LVC or LS logic families.

What are the guaranteed propagation delay specifications for 74LVT125PW/AUJ at 3.3 V?

At VCC = 3.3 V and Tamb = 25 °C, 74LVT125PW/AUJ guarantees tPLH/tPHL ≤ 4.0 ns (input-to-output), tPZH/tPLZ ≤ 4.7 ns (enable-to-output), and tPHZ/tPLZ ≤ 5.1 ns (output-disable). These values are validated across –40 °C to +85 °C, supporting high-speed bus operation up to 250 MHz in properly terminated, low-capacitance traces - essential for FPGA-to-peripheral bridging in real-time control systems.

Is 74LVT125PW/AUJ pin-compatible with other packages in the same family, such as SO14 or DHVQFN14?

Yes, 74LVT125PW/AUJ (TSSOP14/SOT402-1) shares identical pinout and electrical behavior with 74LVT125D (SO14/SOT108-1) and 74LVT125BQ (DHVQFN14/SOT762-1). All variants use the same pin numbering, function mapping, and thermal/mechanical footprint alignment - allowing drop-in replacement across package types based solely on board layout and thermal requirements without redesign.