74LVC8T245BQ,118

Overview

The Nexperia 74LVC8T245BQ,118 is an 8-bit dual supply translating transceiver with 3-state outputs. It enables bidirectional level translation between two data ports (An and Bn) referenced to independent supply voltages VCC(A) and VCC(B). Both supplies range from 1.2 V to 5.5 V, supporting nodes such as 1.2 V, 1.5 V, 1.8 V, 2.5 V, 3.3 V, and 5.0 V. The device features a direction control input (DIR), an active LOW output enable (OE), and IOFF circuitry for partial power-down applications. It operates within a temperature range of -40 °C to +125 °C.

Feature Summary

• Bidirectional level translation between independent voltage domains
• IOFF circuitry prevents damaging backflow current during power-down
• Suspend mode isolates buses when either supply is at GND
• High noise immunity with latch-up performance exceeding 100 mA

Applications

• Partial power-down system architectures
• Mixed voltage bus interfaces
• Low voltage node translation (1.2 V to 5.0 V)
• Suspend mode operation in portable electronics

Procurement Notes

Verify the ordering suffix ',118' corresponds to the DHVQFN-24 package (SOT815-1) and the -40 °C to +125 °C temperature grade. Confirm that the specific variant lacks the 'H' designation, meaning it does not include active bus hold circuitry for floating inputs. Ensure compatibility with the required JEDEC standards for the target voltage levels.

Selection Notes

Select this component when independent A and B port supplies are required for voltage translation. The DHVQFN-24 package offers space efficiency compared to TSSOP options. Note that unlike the LVCH variant, this LVC version does not provide internal bus holding for unused pins, requiring external pull-up or pull-down resistors if inputs may float.

Part Context

This part belongs to the 74LVC/LVCH8T245 family of 8-bit dual-supply translators. It shares functional similarities with single-supply transceivers but adds the capability to bridge disparate voltage domains. The BQ suffix specifically denotes the leadless DHVQFN package, distinguishing it from the PW (TSSOP) and BZ (DHXQFN) variants within the same logical family.

Replacement Considerations

Public confirmed substitute part numbers: 74LVCH8T245BQ-Q10J.