Nexperia USA Inc. 74LVT245BDB,112

Overview

74LVT245BDB,112 from Nexperia is an octal 3-state bidirectional transceiver with direction (DIR) and output enable (OE) control pins, operating at 3.3 V nominal supply. It provides level-shifting capability between 3.3 V and 5 V buses, features bus-hold inputs eliminating external pull-ups, and delivers ±64 mA/±32 mA drive strength. Used in high-speed data bus interfacing between microcontrollers and peripheral ICs in industrial control backplanes.

For engineers reviewing the 74LVT245BDB,112 datasheet, 74LVT245BDB,112 pinout, 74LVT245BDB,112 application, or 74LVT245BDB,112 equivalent, key selection criteria include its 2.7–3.6 V supply range, 5.5 V overvoltage-tolerant inputs, 3.5 ns max propagation delay at 3.3 V, IOFF power-down protection, and SO20 (SOT163-1) package compatibility with legacy 74-series footprints.

Technical Context

The 74LVT245BDB implements BiCMOS logic for high-speed switching and robust output drive while maintaining TTL-compatible input thresholds. Its DIR pin selects data flow direction (A→B or B→A), and OE (active LOW) independently places all outputs in high-impedance state regardless of DIR or data states.

Bus-hold circuitry actively maintains last-valid logic state on unused inputs without external resistors, and IOFF functionality ensures near-zero leakage when VCC = 0 V-critical for live insertion and hot-swap systems. Input clamping supports safe operation with 5 V signals on 3.3 V rails.

Key Specifications

Pinout & Package

74LVT245BDB,112 is packaged in SO20 (SOT163-1): plastic small outline, 20-pin, 7.5 mm body width, standard 0.050″ lead pitch. Pin 1 index located at top-left corner with notch or dot marking.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC245APWR and 74ALVC245MTCX, the 74LVT245BDB,112 uniquely combines 5.5 V input tolerance, bus-hold, and IOFF in a single SO20 package-enabling reliable operation in mixed-voltage, hot-swap, and floating-input scenarios where alternatives require supplemental circuitry or impose system-level constraints.

Availability

74LVT245BDB,112 is available at Aetrix Electronics and suitable for industrial backplane interfaces, microcontroller bus expansion, and hot-swappable module designs requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for 74LVT245BDB,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 delivering high-performance logic, analog, and MOSFET solutions optimized for efficiency, reliability, and miniaturization in industrial and consumer applications.

The 74LVT245BDB,112 belongs to Nexperia's LVT (Low-Voltage TTL) logic family, engineered for high-speed 3.3 V bus interfacing with backward compatibility to TTL levels and robustness in mixed-voltage system integration.

FAQ

What is the maximum clock frequency supported by the 74LVT245BDB,112?

The 74LVT245BDB,112 has a maximum propagation delay of 3.5 ns at 3.3 V, supporting reliable operation up to approximately 100 MHz for synchronous bus protocols. Real-world achievable frequency depends on PCB layout, load capacitance, and termination; measured tPLH/tPHL is 2.4 ns typical at 25 °C.

Can the 74LVT245BDB,112 safely interface a 5 V microcontroller with a 3.3 V FPGA?

Yes-the 74LVT245BDB,112 accepts 5.5 V inputs on all A/B pins while operating from a 3.3 V supply, making it suitable for unidirectional or bidirectional level translation. However, outputs sourced from the 3.3 V side remain 3.3 V logic levels and must be compatible with the FPGA's input thresholds.

Does the 74LVT245BDB,112 require external pull-up resistors on unused inputs?

No-bus-hold circuitry actively retains the last-valid logic state on all A/B inputs, eliminating the need for external pull-up or pull-down resistors. This reduces component count, PCB area, and potential noise coupling from resistor networks.

Is the SO20 package of the 74LVT245BDB,112 pin-compatible with older 74 series transceivers?

Yes-the SOT163-1 (SO20) footprint matches standard 74-series 20-pin SOIC packages including 74LS245 and 74HC245. Pinout is identical: DIR (1), A0–A7 (2–9), GND (10), B0–B7 (11–18), OE (19), VCC (20), enabling drop-in replacement in legacy designs.