Nexperia USA Inc. 74LVT245BBQ,115

Overview

74LVT245BBQ,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, overvoltage-tolerant inputs up to 5.5 V, ±64 mA/–32 mA drive capability, and operates from –40 °C to +85 °C in DHVQFN20 package. It interfaces between 3.3 V logic domains and legacy 5 V buses in memory expansion subsystems.

For engineers reviewing the 74LVT245BBQ,115 datasheet, 74LVT245BBQ,115 pinout, 74LVT245BBQ,115 application, or 74LVT245BBQ,115 equivalent, key selection criteria include bidirectional bus direction control timing, 3-state propagation delays (tPLH/tPHL ≤ 3.5 ns at 3.3 V), bus-hold current specifications (IBHL = 75–150 μA), and thermal-enhanced DHVQFN20 package compatibility with high-density PCB layouts.

Technical Context

The 74LVT245BBQ,115 implements BiCMOS logic for high-speed bidirectional data transfer between two 8-bit buses (A- and B-side), controlled by DIR (active-HIGH direction select) and OE (active-LOW output enable). Its IOFF circuitry ensures power-down isolation, while bus-hold inputs maintain defined logic states without external pull resistors.

It supports live insertion/extraction and tolerates 5.5 V inputs while powered from 2.7–3.6 V, enabling direct interfacing with TTL-level signals. Propagation delays are characterized across voltage (2.7–3.6 V) and temperature (–40 °C to +85 °C), with tPZH/tPHZ ≤ 5.9 ns and tPZL/tPLZ ≤ 5.5 ns under load.

Key Specifications

Pinout & Package

DHVQFN20 package (SOT764-1): 2.5 × 4.5 × 0.85 mm body, no leads, thermally enhanced exposed pad (GND-connected per datasheet recommendation), 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 74LVT245BBQ,115 delivers superior drive strength, guaranteed 5.5 V input tolerance, and DHVQFN thermal efficiency-making it optimal for high-speed, mixed-voltage industrial bus bridging where reliability under voltage stress and thermal load is critical.

Availability

74LVT245BBQ,115 is available at Aetrix Electronics and suitable for memory expansion interfaces, industrial PLC backplanes, embedded test access ports, and legacy peripheral adapters requiring stable component supply across extended temperature ranges and mixed-voltage operation.

Supply support for 74LVT245BBQ,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 optimized for efficiency, reliability, and miniaturization in industrial and consumer applications.

The 74LVT series targets high-speed, mixed-voltage digital interfacing-designed specifically for robust 3.3 V bus bridging with 5 V tolerance, bus-hold, and thermal-enhanced packaging for demanding embedded systems.

FAQ

What is the function of the DIR pin on the 74LVT245BBQ,115?

The DIR (direction) pin is an active-HIGH control input that determines data flow direction: when DIR = HIGH, data passes from A-side inputs (A0–A7) to B-side outputs (B0–B7); when DIR = LOW, data flows from B-side to A-side. It operates independently of OE and remains functional even during power-up sequences due to built-in 3-state initialization.

Can the 74LVT245BBQ,115 safely interface with 5 V logic while powered at 3.3 V?

Yes. Its inputs tolerate up to 5.5 V regardless of VCC level, allowing direct connection to 5 V TTL or CMOS outputs without external level-shifting components. This is validated per datasheet Table 4 (VI max = +7.0 V) and Table 5 (VI max = 5.5 V under recommended conditions), with no risk of latch-up due to integrated protection exceeding 500 mA per JEDEC Std 17.

How does the bus-hold feature eliminate external pull resistors?

The bus-hold circuit actively maintains the last-valid logic state on unused A/B pins using internal feedback transistors. At VCC = 3.0 V, IBHL = 75–150 μA holds LOW and IBHH = –150 to –75 μA holds HIGH-providing sufficient current to overcome typical PCB leakage and noise without external components, as confirmed in Table 6 of the datasheet.

Is the thermal pad on the DHVQFN20 package electrically connected?

Yes. The exposed thermal pad (terminal 10, labeled GND in Fig. 4) is internally connected to the die substrate and must be soldered to a PCB GND plane. Datasheet Fig. 4 note (1) states it "should remain floating or connected to GND"; however, Nexperia application guidance and thermal characterization require GND connection to achieve specified θJA = 45 °C/W and prevent junction overheating under 64 mA drive conditions.