74AVCH1T45FX4-7

Overview

The 74AVCH1T45FX4-7 is a single-bit dual-supply translating transceiver with 3-state outputs manufactured by Diodes Incorporated. It facilitates logic level translation between voltage domains ranging from 1.2V to 3.6V for both VCCA and VCCB supplies. The device incorporates bus hold circuitry at each input to maintain valid logic levels without external resistors. It features an IOFF function that supports partial power-down mode, ensuring output remains in a high-impedance state when either supply is zero to prevent backflow currents. The component operates within a temperature range of -40°C to +85°C.

Feature Summary

• Dual supply voltage operation supporting universal low-voltage translation across 1.2V to 3.6V ranges
• Integrated bus hold feature maintains previous logic levels on unused or disconnected inputs
• IOFF circuitry enables partial power-down mode preventing damaging backflow currents when powered down
• High noise immunity with typical 100mV hysteresis and robust ESD protection exceeding JESD 22 standards

Applications

• Voltage level translation connecting logic types operating at different voltages
• Power down signal isolation where one voltage domain is turned off to isolate signals
• Portable electronics such as cell phones, tablets, e-readers, and personal navigation devices
• Computing peripherals including PCs, notebooks, hard drives, and CD/DVD ROMs
• Networking equipment such as routers, gateways, and set-top boxes

Procurement Notes

Verify the FX4 package designation corresponds to the X2-DFN1409-6 footprint during procurement. Confirm RoHS compliance and halogen-free status requirements align with project specifications. Ensure ordering suffix -7 matches the required tape and reel packaging quantity. Validate that the manufacturer is Diodes Incorporated to guarantee datasheet accuracy and component authenticity.

Selection Notes

Select this component for applications requiring bidirectional translation between dissimilar voltage domains within the 1.2V to 3.6V range. The inclusion of bus hold functionality eliminates the need for external pull-up or pull-down resistors on floating inputs. Consider the IOFF capability if the design requires electrical isolation during partial power-down states. Verify that the X2-DFN1409-6 package dimensions fit the available PCB real estate constraints.

Part Context

This part belongs to the 74AVCH series of logic translators from Diodes Incorporated, designed for low-voltage digital systems. It serves as a variant of the standard 74AVC1T45 by adding bus hold capabilities to each input pin. The FX4 suffix specifically identifies the X2-DFN1409-6 chip-scale package, which offers a compact alternative to traditional surface-mount packages like SOT363.

Replacement Considerations

The datasheet lists the 74AVC1T45 as the base variant without bus hold. Other package variants include DW (SOT363), W6 (SOT26), FW3 (X2-DFN0910-6), FW5 (X1-DFN1010-6), and FZ4 (X2-DFN1410-6). Cross-referencing with other manufacturers' parts like SN74AVCH1T45 requires verification of pinout and electrical characteristics.