74LVCH8T245BQ,118

Overview

The Nexperia 74LVCH8T245BQ,118 is an 8-bit dual supply translating transceiver with 3-state outputs. It enables bidirectional level translation between any low voltage nodes ranging from 1.2 V to 5.5 V on both ports. The device features a direction control input (DIR), an output enable input (OE), and active bus hold circuitry to maintain valid logic levels on unused inputs. It supports partial power-down applications via IOFF circuitry, which disables outputs to prevent damaging backflow current when powered down.

Feature Summary

• Bidirectional level translation between independent A and B ports
• Active bus hold circuitry for floating data inputs
• IOFF circuitry for partial power-down mode operation
• Suspend mode functionality when either supply is at GND

Applications

• Mixed 5 V and 3.3 V system interfaces
• Partial power-down applications requiring isolation
• Low voltage node translation (1.2 V to 5.0 V)

Procurement Notes

Verify the ordering suffix ',118' corresponds to the DHVQFN-24 package (SOT815-1) as specified in the datasheet. Confirm the temperature range is -40 °C to +125 °C. Ensure the specific variant matches the LVCH series requirements for active bus hold functionality rather than the standard LVC version.

Selection Notes

Select this component when interfacing systems operating at different supply voltages within the 1.2 V to 5.5 V range. The DHVQFN-24 package offers space-saving benefits for PCB layouts. Consider the active bus hold feature if inputs may remain unconnected during operation. Verify that the required propagation delay and output drive capabilities meet the specific signal integrity requirements of the target application.

Part Context

This part belongs to the 74LVCH8T245 family of octal bus transceivers. It shares functional similarities with the 74LVC8T245 but includes active bus hold circuitry. The 'BQ' designation indicates the DHVQFN-24 leadless package, distinguishing it from TSSOP or other available form factors within the same logical family.

Replacement Considerations

The 74LVC8T245BQ,118 serves as a direct functional substitute, differing only by the absence of active bus hold circuitry. Other package variants such as the 74LVCH8T245PW-Q10J offer identical electrical performance in a TSSOP-24 housing.