74VHCT245D,118

Buffers, Drivers, Receivers, Transceivers Overview

The Nexperia 74VHCT245D,118 is an octal bus transceiver featuring non-inverting 3-state outputs. It operates with a supply voltage range of 4.5 V to 5.5 V and utilizes TTL input levels. The device includes an output enable (OE) and direction control (DIR) input for bidirectional data transfer between ports A and B. It is housed in a 20-lead SO20 plastic small outline package (SOT163-1).

Buffers, Drivers, Receivers, Transceivers Feature Summary

• Balanced propagation delays for consistent signal timing.
• All inputs feature Schmitt-trigger action for noise immunity.
• Inputs accept voltages higher than the supply voltage (VCC).
• ESD protection exceeds 2000 V (HBM) and 1000 V (CDM).

Buffers, Drivers, Receivers, Transceivers Applications

• High-speed data transmission on parallel buses.
• Memory address register buffering.
• Clock drivers and distribution networks.

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify the specific ordering suffix

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component when TTL-compatible inputs are required for CMOS logic systems. The VHCT series bridges the gap between older TTL standards and modern high-speed CMOS technologies. Ensure the application environment stays within the specified -40 °C to +125 °C temperature range and that the 5.5 V maximum supply voltage is not exceeded.

Buffers, Drivers, Receivers, Transceivers Part Context

This part belongs to the 74VHC/VHCT family of high-speed Si-gate CMOS devices. The VHCT variant specifically provides TTL-compatible input thresholds while maintaining the speed and low power characteristics of standard VHC logic. It serves as a bridge for interfacing legacy TTL components with modern high-speed digital circuits.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

Check for pin-compatible alternatives such as the 74AHCT245 or 74LVC245 if different drive strengths or voltage ranges are needed. Verify that any substitute maintains the same 20-SOIC package and functional compatibility.

Buffers, Drivers, Receivers, Transceivers FAQ

What is the function of the DIR input?

The DIR input controls the direction of data flow. When DIR is HIGH, data transfers from port A to port B. When DIR is LOW, data transfers from port B to port A.

How does the OE input affect the outputs?

The OE (Output Enable) input controls the state of the outputs. When OE is HIGH, all outputs assume a high-impedance OFF-state, effectively isolating the buses. When OE is LOW, the transceiver is enabled.

Can this device interface with voltages exceeding VCC?

Yes, the inputs accept voltages higher than VCC. This allows the device to be used in mixed-voltage environments where input signals may exceed the supply voltage level.