Nexperia USA Inc. 74LVT126D,112

Overview

74LVT126D,112 from Nexperia is a 3.3 V quad non-inverting buffer with 3-state outputs, designed for bus interface and level translation in mixed-voltage systems. It features bus-hold inputs (eliminating external pull-ups), IOFF partial power-down protection, ±64 mA output drive, and 5.5 V-tolerant inputs. It operates from -40 °C to +85 °C and is used in industrial control backplanes and FPGA I/O expansion interfaces.

For engineers reviewing the 74LVT126D,112 datasheet, 74LVT126D,112 pinout, 74LVT126D,112 application, or 74LVT126D,112 equivalent, key selection criteria include 3-state timing (tPZH ≤ 5.4 ns at 3.3 V), bus-hold current (IBHL = 75–150 μA), IOFF leakage (< ±100 μA at VCC = 0 V), and SO14 package compatibility with legacy 74-series footprints.

Technical Context

The 74LVT126D implements four independent BiCMOS buffer channels, each with dedicated active-low output enable (nOE) controlling high-impedance OFF-state transitions. Its IOFF circuitry disables outputs during power-down, blocking backflow current when VCC = 0 V and VI/VO = 0–4.5 V.

Bus-hold inputs maintain logic state without external resistors-IBHL = 75–150 μA at VI = 0.8 V and IBHH = −75 to −150 μA at VI = 2.0 V-enabling robust floating-input handling. Input voltage tolerance extends to 5.5 V, allowing direct interfacing with 5 V TTL systems while powered from 2.7–3.6 V.

Key Specifications

Pinout & Package

74LVT126D,112 is housed in a plastic small outline package (SO14, SOT108-1) with 14 leads and 3.9 mm body width. Pin 1 is marked by a notch or bevel; the package is lead-free and RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC126APWR and 74ALVC126PW, the 74LVT126D,112 uniquely combines 5.5 V input tolerance, integrated bus-hold, and certified IOFF protection-making it the only option qualified for robust, maintenance-friendly industrial backplane upgrades.

Availability

74LVT126D,112 is available at Aetrix Electronics and suitable for industrial backplane interfaces, FPGA I/O expansion, hot-swappable module control, and legacy system upgrade interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74LVT126D,112 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-performance, reliable standard logic and analog devices, serving industrial, automotive, and computing markets with scalable manufacturing and rigorous quality systems.

The 74LVT series delivers advanced BiCMOS-based 3.3 V logic optimized for mixed-voltage system interfacing, emphasizing bus integrity, power-down safety, and legacy compatibility in demanding industrial environments.

FAQ

Does 74LVT126D,112 support live insertion into a powered 5 V bus?

Yes. Its IOFF circuitry blocks back-current when VCC = 0 V and bus lines are at 5 V, and bus-hold inputs prevent floating states during insertion. This combination meets IEC 61000-4-2 system-level ESD requirements for hot-swap modules without additional protection circuitry.

Can 74LVT126D,112 drive a 50 pF load at 25 MHz without signal degradation?

Yes. With tPLH/tPHL ≤ 3.9 ns at 3.3 V and output drive of +64 mA/−32 mA, it maintains clean edges into 50 pF loads at 25 MHz. Table 9 confirms stable switching with CL = 50 pF, RL = 500 Ω, and tr/tf ≤ 2.5 ns under recommended operating conditions.

What is the maximum allowable input voltage when VCC = 0 V?

The absolute maximum input voltage is +7.0 V per Table 4, but sustained operation above 5.5 V risks exceeding clamp current limits. At VCC = 0 V, VI must stay within −0.5 V to +7.0 V; however, clamping current IIK is limited to −50 mA, so 5.5 V remains the practical safe limit for continuous 5 V bus interfacing.

How does bus-hold functionality affect power consumption in unused input scenarios?

Bus-hold draws IBHL = 75–150 μA at VI = 0.8 V (LOW) or IBHH = −75 to −150 μA at VI = 2.0 V (HIGH), adding < 0.5 mW per held input at 3.3 V. This is significantly lower than typical 10 kΩ pull-up power (≈0.33 mW at 3.3 V) and eliminates resistor thermal drift and layout constraints.