NXP Semiconductors 74LVT245BQ,115

Overview

74LVT245BQ,115 from Nexperia is a 3.3 V octal bidirectional transceiver with 3-state outputs, direction control (DIR), and output enable (OE). It features bus-hold inputs eliminating external pull-ups, overvoltage-tolerant inputs up to 5.5 V, ±64 mA/–32 mA drive capability, and operates from –40 °C to +85 °C. It serves as a level-shifting interface between 3.3 V logic domains and legacy 5 V buses in embedded control backplanes.

For engineers reviewing the 74LVT245BQ,115 datasheet, 74LVT245BQ,115 pinout, 74LVT245BQ,115 application, or 74LVT245BQ,115 equivalent, key selection criteria include its 2.7–3.6 V supply range, 4.0 ns max propagation delay at 3.3 V, IOFF power-down protection, and DHVQFN20 thermal-enhanced package for high-density PCB layouts.

Technical Context

This BiCMOS transceiver implements dual-bus bidirectional data flow controlled by DIR and OE pins: DIR selects A→B (LOW) or B→A (HIGH), while OE (active LOW) enables/disables all outputs into high-impedance state. Its bus-hold circuitry maintains valid logic levels on unused inputs without external resistors.

The device supports live insertion/extraction and includes IOFF circuitry that disables outputs during power-down, preventing current backflow when VCC = 0 V. Inputs tolerate up to 5.5 V regardless of VCC, enabling direct interfacing with TTL and 5 V CMOS systems while powered from 3.3 V.

Key Specifications

Pinout & Package

DHVQFN20 (SOT764-1) package: 2.5 × 4.5 × 0.85 mm body, no leads, thermally enhanced exposed pad (GND-connected per design guidance), 20 terminals, pin 1 index area marked.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal transceiver applications.

Compared with SN74LVC245APWR and 74ALVC245PW, the 74LVT245BQ,115 uniquely combines 5.5 V input tolerance, integrated bus-hold, and ±64 mA drive in a thermally optimized DHVQFN20 package-making it optimal for industrial backplanes requiring mixed-voltage resilience and zero-external-component reliability.

Availability

74LVT245BQ,115 is available at Aetrix Electronics and suitable for industrial backplane interfaces, microcontroller bus expansion, automated test equipment fixtures, and communications module isolation requiring stable component supply across extended temperature ranges.

Supply support for 74LVT245BQ,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 delivering high-performance logic, analog, and MOSFET solutions with focus on efficiency, reliability, and miniaturization for industrial and automotive markets.

The 74LVT series targets high-speed, mixed-voltage digital interfacing in space-constrained industrial systems, emphasizing robustness, thermal performance, and simplified board design through integrated features like bus-hold and IOFF.

FAQ

What is the maximum clock frequency supported by the 74LVT245BQ,115?

The 74LVT245BQ,115 does not operate on a clock; it is an asynchronous transceiver. Its usable data rate is determined by propagation delay (max 4.0 ns at 3.3 V) and system timing margins. For clean 100 MHz bus operation, setup/hold times remain within specification when driven with ≤ 2.5 ns edge rates and ≤ 15 pF load capacitance.

Can the 74LVT245BQ,115 safely interface with a 5 V microcontroller's GPIO?

Yes - its inputs tolerate up to 5.5 V regardless of VCC, allowing direct connection to 5 V GPIO outputs. However, its outputs swing only to VCC (3.3 V), so 5 V receivers must be 3.3 V–tolerant (e.g., TTL-compatible inputs). For bidirectional 5 V signaling, external level-shifting is required on the output side.

Is the exposed thermal pad on the DHVQFN20 package electrically connected?

No - the exposed pad (terminal 1 index area) is not internally connected to any circuit node. Per Nexperia's guidance, it may be left floating or soldered to a GND plane for thermal improvement, but must never be connected to VCC or signal nets to avoid parasitic coupling or short circuits.

Does the bus-hold feature affect power consumption during active operation?

Bus-hold adds ≤ 150 μA per input at VI = 2.0 V or 0.8 V, contributing < 1.2 mA total for all eight inputs - negligible versus typical ICC of 0.19 mA. It activates only on near-threshold inputs and draws no current when inputs are solidly HIGH or LOW, making it transparent to steady-state power budgets.