Nexperia USA Inc. 74LVT2245DB,112

Overview

74LVT2245DB,112 from Nexperia is a 3.3 V octal bidirectional transceiver with integrated 30 Ω output termination resistors, 3-state outputs, bus hold inputs, and overvoltage-tolerant inputs up to 5.5 V. It operates across 2.7 V–3.6 V supply, delivers ±12 mA drive strength, and supports high-speed data transfer between 3.3 V buses and legacy 5 V systems in backplane or memory interface applications.

For engineers reviewing the 74LVT2245DB,112 datasheet, 74LVT2245DB,112 pinout, 74LVT2245DB,112 application, or 74LVT2245DB,112 equivalent, key selection criteria include direction control (DIR) and output enable (OE) timing, 30 Ω on-die termination for signal integrity, bus hold functionality eliminating external pull-ups, and compatibility with TTL-level logic in mixed-voltage environments.

Technical Context

This BiCMOS transceiver implements dual-bus bidirectional data flow controlled by DIR (send/receive) and OE (output enable). When OE is HIGH, all outputs enter high-impedance OFF-state regardless of DIR state; when OE is LOW, data flows A→B (DIR=HIGH) or B→A (DIR=LOW).

Each I/O pin features bus hold circuitry (IBHL/IBHH ≥75 μA) to maintain last-valid logic state on unused inputs, and IOFF protection ensures low leakage (<±100 μA) during partial power-down. Inputs tolerate up to 5.5 V independent of VCC, enabling safe interfacing with 5 V buses without level shifters.

Key Specifications

Pinout & Package

74LVT2245DB,112 is packaged in SO20 (SOT163-1), a plastic small outline package with 20 leads and 7.5 mm body width. Pin 1 is marked by a notch or dot; pin numbering follows standard counter-clockwise sequence from top-left corner.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74LVT2245DB,112, the PW variant offers identical functionality in a smaller footprint but reduced thermal performance, while the SN74LVC245APWR lacks on-die termination and 5 V tolerance-requiring additional components and limiting mixed-voltage use cases.

Availability

74LVT2245DB,112 is available at Aetrix Electronics and suitable for memory interface buses, industrial backplanes, test equipment signal routing, and telecom line card designs requiring stable component supply, consistent parametric performance, and long-term lifecycle support.

Supply support for 74LVT2245DB,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, automotive, and consumer applications.

The 74LVT series targets high-speed, low-voltage bus interface applications where signal integrity, mixed-voltage compatibility, and robustness in harsh environments are critical design requirements.

FAQ

What is the function of the DIR and OE pins on the 74LVT2245DB,112?

DIR (pin 1) controls data direction: HIGH enables A→B flow, LOW enables B→A flow. OE (pin 19) is an active-LOW output enable-when HIGH, all outputs go high-impedance regardless of DIR state; when LOW, outputs follow DIR-controlled direction. Both operate asynchronously with no internal synchronization.

Does the 74LVT2245DB,112 require external pull-up resistors on unused inputs?

No. The device integrates bus hold circuitry on all A and B port inputs, providing ±75 μA to ±150 μA holding current to retain the last-valid logic state. This eliminates the need for external pull-up or pull-down resistors on floating inputs, reducing component count and layout complexity.

Can the 74LVT2245DB,112 safely interface with a 5 V bus while operating at 3.3 V VCC?

Yes. All A and B port inputs are overvoltage tolerant up to 5.5 V regardless of VCC level. This allows direct connection to 5 V logic without level shifters or clamping diodes, provided output loading remains within ±12 mA limits and termination matches the transmission line impedance.

What is the purpose of the 30 Ω termination resistors in the 74LVT2245DB,112?

The 30 Ω series termination resistors are integrated into each output driver to match typical PCB trace impedances (e.g., 50–75 Ω) when combined with load capacitance. They reduce signal reflections and overshoot/undershoot on medium-length traces (≤15 cm), improving eye diagram margins without requiring discrete resistors.