Nexperia USA Inc. 74LVT126D,118

Overview

74LVT126D,118 from Nexperia is a 3.3 V quad 3-state buffer/line driver with bus-hold inputs, IOFF partial power-down protection, and ±64 mA/–32 mA output drive. It operates from 2.7 V to 3.6 V, tolerates 5.5 V inputs, and supports hot-plug operation in mixed-voltage bus systems such as industrial backplanes and FPGA I/O expansion interfaces.

For engineers reviewing the 74LVT126D,118 datasheet, 74LVT126D,118 pinout, 74LVT126D,118 application, or 74LVT126D,118 equivalent, key selection criteria include 3-state timing (tPZH ≤ 5.4 ns), overvoltage-tolerant inputs, bus-hold current (IBHL = 75–150 μA), and IOFF leakage (< ±100 μA at VCC = 0 V).

Technical Context

This BiCMOS device implements four independent non-inverting buffers, each with dedicated active-low output enable (nOE) control. Its IOFF circuit disables outputs during power-down, blocking reverse current flow when VCC = 0 V while inputs/outputs remain connected to live 5 V buses.

Bus-hold circuitry maintains stable logic states on unused inputs without external pull-ups-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 in high-density PCB layouts.

Key Specifications

Pinout & Package

74LVT126D,118 is packaged in SO14 (SOT108-1), a plastic small outline package with 14 leads and 3.9 mm body width. Pin 1 is marked by a notch or dot; pin 7 is GND and pin 14 is VCC.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74LVT126D,118, the TSSOP variant offers identical functionality in a smaller footprint but demands tighter assembly control, while the TI LVC variant sacrifices IOFF protection and bus-hold-increasing BOM cost and reducing robustness in mixed-voltage or hot-plug scenarios.

Availability

74LVT126D,118 is available at Aetrix Electronics and suitable for industrial backplane interfaces, FPGA I/O expansion, telecom line card buffering, and automated test equipment signal routing requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74LVT126D,118 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 essential efficiency technologies, delivering high-performance logic, analog, and MOSFET solutions for industrial, automotive, and computing markets.

The 74LVT126 belongs to Nexperia's LVT (Low-Voltage TTL) logic family, engineered for high-speed 3.3 V bus interfacing with robust mixed-voltage compatibility and system-level reliability features like IOFF and bus-hold.

FAQ

Can 74LVT126D,118 safely interface with 5 V logic while powered at 3.3 V?

Yes. Its inputs tolerate up to 5.5 V regardless of VCC setting, enabling direct connection to 5 V TTL outputs without level shifters. This is verified in Table 4 (Limiting Values) and Table 5 (Recommended Operating Conditions), where VI(max) = 5.5 V and VCC = 2.7–3.6 V are explicitly decoupled specifications.

What is the purpose of the IOFF feature, and how does it behave during power-down?

IOFF disables outputs and blocks reverse current flow when VCC = 0 V, preventing damage to powered-down devices connected to live buses. Per Section 1 and Table 9, IOFF leakage remains ≤ ±100 μA at VCC = 0 V and VI/VO = 0–4.5 V, ensuring safe partial power-down operation in hot-swap systems.

How does bus-hold functionality eliminate external pull-up resistors?

Bus-hold circuitry actively maintains the last-valid logic state on unused inputs using internal feedback transistors. As specified in Table 6, IBHL = 75–150 μA at VI = 0.8 V and IBHH = –75 to –150 μA at VI = 2.0 V-sufficient to override noise and leakage without external components.

Is 74LVT126D,118 suitable for hot-plug applications, and what design features enable this?

Yes. It supports live insertion/extraction via three integrated features: IOFF (blocks backfeed current at VCC = 0 V), overvoltage-tolerant inputs (5.5 V rating), and power-up 3-state (outputs remain high-Z until VCC stabilizes). These are explicitly stated in Sections 1 and 2 of the datasheet.