74AVCH4T245QPWRQ1

Overview

The SN74AVCH4T245-Q1 is an automotive-grade, 4-bit noninverting bus transceiver featuring configurable dual-supply voltage translation and 3-state outputs. It supports a power supply range of 1.08V to 3.6V on both ports (VCCA and VCCB), enabling universal bidirectional translation between standard low-voltage nodes such as 1.2V, 1.5V, 1.8V, 2.5V, and 3.3V. The device accommodates data rates up to 500Mbps during translation from 1.08V to 3.6V. It includes Ioff for partial power-down support, active bus-hold circuitry to eliminate external resistors, and robust ESD protection exceeding JESD standards.

Feature Summary

• Fully configurable dual-rail design allows independent operation of each port over the full 1.08V to 3.6V power-supply range.
• Integrated Ioff circuitry disables outputs to prevent damaging backflow current during partial power-down mode.
• Active bus-hold circuitry maintains unused or undriven data inputs at valid logic states without requiring external pull-up or pull-down resistors.
• VCC isolation feature forces both ports into a high-impedance state if either supply rail drops to ground.

Applications

• Personal electronics
• Industrial systems
• Enterprise infrastructure
• Telecommunications equipment

Procurement Notes

Verify that the specific ordering suffix matches the required package type and tape-and-reel specifications. Confirm that the component meets AEC-Q100 qualification requirements for the intended automotive application environment. Ensure that the voltage levels on both VCCA and VCCB rails remain within the specified 1.08V to 3.6V operational limits during all system states.

Selection Notes

Select this component when asynchronous communication between two data buses operating at different voltage levels is required. The device is suitable for designs needing bidirectional translation between any combination of 1.2V, 1.5V, 1.8V, 2.5V, and 3.3V nodes. Consider the 16-pin TSSOP package for space-constrained PCB layouts requiring surface-mount installation.

Part Context

This device belongs to the SN74AVCH4T245-Q1 family of automotive-level voltage translators. It is designed by Texas Instruments to provide reliable level-shifting in harsh environments. The Q1 suffix indicates compliance with automotive reliability standards, distinguishing it from commercial variants while maintaining functional compatibility with standard AVC logic families.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.

FAQ

How does the device handle unused or undriven inputs?

The device features active bus-hold circuitry that holds unused or undriven data inputs at a valid logic state. Consequently, the use of external pull-up or pull-down resistors is not recommended.

What is the behavior of the ports if one supply voltage is at ground?

The VCC isolation feature ensures that if either VCCA or VCCB is at GND (or below 0.4V), both ports enter a high-impedance state to prevent false logic levels from appearing on either bus.