74AVC4T245QDYYRQ1

Overview

The SN74AVC4T245-Q1 is an automotive-grade, 4-bit dual-supply bus transceiver with configurable voltage-level shifting and 3-state outputs. It supports VCCA and VCCB supply voltages from 1.2V to 3.6V, enabling bidirectional translation between any low-voltage nodes within this range. The device features I/Os that are 4.6V tolerant and includes Ioff circuitry for partial power-down mode operation. It is qualified under AEC-Q100 standards with a temperature grade of 1, covering an ambient operating range from -40°C to +125°C.

Feature Summary

• AEC-Q100 qualified for automotive applications with specified ESD classification levels and functional safety capability.
• Fully configurable dual-rail design allows each port to operate over the full 1.2V to 3.6V power-supply range.
• I/Os are 4.6V tolerant, supporting high-voltage interfacing while maintaining low-voltage logic compatibility.
• Ioff circuitry disables outputs to prevent damaging current backflow during partial power-down scenarios.

Applications

• Telematics systems
• Instrument clusters
• Head units
• Navigation systems

Procurement Notes

Verify the specific package variant (DYY) against the required footprint and thermal management needs. Confirm that the ordering suffix matches the exact reel or cut-tape configuration intended for assembly. Ensure the component meets the specific AEC-Q100 qualification requirements for the target automotive application zone.

Selection Notes

Select this component when asynchronous communication between two data buses requires universal low-voltage bidirectional translation. It is suitable for designs needing configurable voltage nodes between 1.2V and 3.6V. Consider its 4.6V tolerance for interfacing with higher voltage lines without additional protection components.

Part Context

This device belongs to the SN74AVC4T245-Q1 family, which is part of Texas Instruments' automotive-qualified AVC series. It shares functional similarities with other dual-supply translators but is specifically optimized for automotive environments requiring robust ESD performance and wide operating temperature ranges.

Replacement Considerations

Check for SN74AVC4T245-Q1 variants with different package codes (e.g., RGY, PW, BQB) if pinout compatibility allows. Verify that any substitute maintains the same AEC-Q100 qualification and 4.6V I/O tolerance specifications.

FAQ

How does the device handle partial power-down?

The Ioff circuitry automatically disables the I/O output circuits when the device is powered down, preventing damaging current backflow through the device.

What is the maximum data rate supported?

The device supports maximum data rates up to 380Mbps when translating between 1.8V and 3.3V, with lower rates for other voltage combinations.