Diodes Incorporated 74LVC245AQ20-13

Overview

74LVC245AQ20-13 from Diodes Incorporated is an octal bus transceiver with 3-state outputs, designed for bidirectional asynchronous data transfer between voltage-level-mixed buses. It operates from 1.65V to 3.6V, supports 5.5V-tolerant inputs, delivers ±24mA drive at VCC = 3.0V, and features IOFF partial power-down protection. It is used in notebook I/O expansion and peripheral bus isolation where mixed-voltage signal bridging is required.

For engineers reviewing the 74LVC245AQ20-13 datasheet, 74LVC245AQ20-13 pinout, 74LVC245AQ20-13 application, or 74LVC245AQ20-13 equivalent, key selection criteria include 3-state direction control timing (tEN ≤ 8.5ns @ 3.3V), V-QFN4525-20 thermal resistance (θJA = 67°C/W), 5.5V input tolerance, and IOFF-enabled safe power sequencing in multi-rail systems.

Technical Context

This device implements dual 8-bit bidirectional data paths controlled by DIR and OE pins, enabling A→B or B→A transmission with simultaneous 3-state output disable. Its Schmitt-trigger inputs ensure noise immunity on slow or noisy control lines, and the IOFF circuit actively disables outputs during VCC = 0V to prevent back-current flow.

It complies with JEDEC JESD8-12 for 1.8V/2.5V/3.3V logic families and meets JESD78 Class I latch-up immunity (>250mA). The V-QFN4525-20 package provides low-inductance ground connections and 0.50mm pitch for high-density PCB layouts in space-constrained embedded applications.

Key Specifications

Pinout & Package

V-QFN4525-20 (JEDEC V-QFN4525-20, 2.5mm × 4.5mm × 0.95mm, 0.50mm pitch, exposed thermal pad).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC245APWR, the 74LVC245AQ20-13 offers superior thermal performance in space-constrained layouts; compared with 74AVC245T20X, it retains full 5.5V input compatibility essential for legacy peripheral integration.

Availability

74LVC245AQ20-13 is available at Aetrix Electronics and suitable for PC notebook I/O expansion, industrial PLC backplane interface, and automotive infotainment display link applications requiring stable component supply and guaranteed long-term sourcing.

Supply support for 74LVC245AQ20-13 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in California, with design centers across Asia and manufacturing in Taiwan and China.

The 74LVC logic family targets high-speed, low-voltage, mixed-signal interface applications in computing, communications, and industrial systems-designed specifically for voltage translation, bus buffering, and power-aware signal routing.

FAQ

What is the maximum operating temperature for 74LVC245AQ20-13?

The device is rated for continuous operation from –40°C to +125°C junction temperature. At maximum ambient (85°C) with typical PCB layout, its 67°C/W θJA allows up to 150mW total power dissipation before reaching TJ = 125°C, verified per JEDEC JESD51-2 thermal test conditions.

Can 74LVC245AQ20-13 safely interface a 5V microcontroller GPIO to a 1.8V FPGA?

Yes-the inputs tolerate up to 5.5V regardless of VCC, so 5V GPIO signals may be applied directly to A/B pins or DIR/OE. However, outputs swing only to VCC (max 3.6V), so 5V FPGA inputs require external pull-ups or level-shifting for reliable high-level detection.

Does the V-QFN4525-20 package require solder paste stencil adjustments versus standard QFN?

Yes-the 0.50mm pitch and 0.23mm nominal lead width demand a 5.5mil (0.14mm) thick stencil with 80% area ratio apertures. Diodes' AP02001 recommends 0.33mm X 0.33mm openings for optimal paste release and void minimization under the thermal pad.

How does IOFF behavior differ from standard high-impedance state during power-down?

IOFF actively disables output drivers using internal circuitry that blocks current flow even when VCC = 0V and I/O pins are pulled to 5.5V-unlike passive 3-state, which relies on VCC bias to maintain gate control. This prevents reverse current damage to unpowered ICs on the same bus.