Nexperia USA Inc. 74LVT14BQ,115

Overview

74LVT14BQ,115 from Nexperia is a 3.3 V hex inverter with Schmitt-trigger inputs, designed for noise-immune signal conditioning in bus-hold applications. It features six independent inverting channels, ±20 mA/32 mA output drive, IOFF partial power-down protection, and operates across –40 °C to +85 °C with supply voltage from 2.7 V to 3.6 V. Used in industrial control backplanes and legacy TTL-to-LVTTL level translation.

For engineers reviewing the 74LVT14BQ,115 datasheet, 74LVT14BQ,115 pinout, 74LVT14BQ,115 application, or 74LVT14BQ,115 equivalent, this device delivers verified Schmitt-trigger hysteresis (0.4–0.6 V), sub-6 ns propagation delay at 3.3 V, overvoltage-tolerant inputs up to 5.5 V, and bus-hold functionality eliminating external pull-ups - critical for robust digital interface design in mixed-voltage systems.

Technical Context

The 74LVT14BQ implements six independent CMOS-compatible inverters with asymmetric Schmitt-trigger input thresholds (VT+ = 1.5–2.0 V, VT− = 0.9–1.3 V at VCC = 3.3 V), enabling reliable switching on slow or noisy signals. Its BiCMOS output stage supports high-speed operation while delivering strong sink/source capability.

IOFF circuitry actively disables outputs when VCC = 0 V, limiting backflow current to ±100 μA and enabling hot-insertion in partial-power-down systems. Bus-hold inputs retain last valid logic state without external biasing, reducing BOM count and PCB footprint in unterminated bus environments.

Key Specifications

Pinout & Package

DHVQFN14 (SOT762-1) package: 2.5 × 3 × 0.85 mm body, no leads, exposed thermal pad (non-soldered or GND-connected), 14 terminals in quad arrangement with pin 1 index area.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar hex inverter with Schmitt-trigger applications.

Compared with SN74LVC14APWR, the 74LVT14BQ,115 adds essential IOFF and bus-hold for hot-swap and BOM reduction; versus 74LVTH14PW,118, it delivers identical logic and protection in a thermally enhanced, space-saving DHVQFN14 package ideal for dense industrial modules.

Availability

74LVT14BQ,115 is available at Aetrix Electronics and suitable for industrial backplane interfaces, TTL-to-LVTTL translation, switch debouncing circuits, and bus signal conditioning requiring stable component supply across extended temperature ranges.

Supply support for 74LVT14BQ,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 for automotive, industrial, and consumer markets.

The 74LVT14BQ belongs to Nexperia's LVT (Low-Voltage TTL) logic family, engineered for robust 3.3 V operation with backward compatibility to TTL signaling and enhanced noise immunity in harsh industrial environments.

FAQ

What is the purpose of the bus-hold feature on the 74LVT14BQ,115 inputs?

The bus-hold circuit actively retains the last valid logic state on each input when left floating, eliminating the need for external pull-up or pull-down resistors. This reduces component count, saves PCB space, and prevents undefined states during power-up, hot-swap, or signal disconnection - especially valuable in modular backplane designs.

Can the 74LVT14BQ,115 safely interface with 5 V logic outputs?

Yes - its inputs are overvoltage tolerant up to 5.5 V regardless of VCC level, allowing direct connection to 5 V TTL or CMOS outputs without level-shifting circuitry. This is confirmed in Table 4 (Limiting Values) and Table 5 (Recommended Operating Conditions) of the official Nexperia datasheet Rev. 5.

How does the IOFF function protect the device during partial power-down?

When VCC = 0 V, the IOFF circuit disables all outputs and limits leakage current to ±100 μA, preventing reverse current flow from powered downstream buses into the unpowered IC. This protects against latch-up and ensures safe hot-plug operation in multi-rail systems - a key requirement in industrial control chassis.

Is the exposed thermal pad on the DHVQFN14 package electrically connected?

No - the exposed pad (terminal 1 index area) has no electrical function. Per Nexperia's SOT762-1 package drawing, it may be left unsoldered or connected to GND if soldered, but must never be tied to VCC or left floating with conductive paste. Thermal performance improves with GND connection, but electrical isolation is maintained.