74HCT245D-Q100J

Overview

The 74HCT245D-Q100 is an octal bus transceiver with 3-state outputs, qualified to AEC-Q100 Grade 1 for automotive use. It operates within a supply voltage range of 4.5 V to 5.5 V and supports ambient temperatures from -40 °C to +125 °C. The device features TTL-level inputs and non-inverting data paths controlled by Direction (DIR) and Output Enable (OE) signals. Propagation delay is typically 12 ns at 4.5 V and 10 ns at 5.0 V with 15 pF load capacitance. It is housed in a SO20 plastic small outline package (SOT163-1).

Feature Summary

• Automotive qualification in accordance with AEC-Q100 Grade 1 standards.
• TTL-compatible input levels for direct interfacing with standard logic families.
• Bidirectional octal bus interface with direction control via DIR pin.
• High noise immunity and low power CMOS dissipation characteristics.

Applications

• Automotive electronic systems requiring robust data bus transceivers.
• Bidirectional data transmission between microcontrollers and peripheral devices.
• Bus-oriented memory and I/O expansion in vehicle control units.

Procurement Notes

Verify the specific ordering suffix matches the required package type, as the base part number covers multiple variants. Confirm that the temperature grade aligns with the application's thermal requirements. Ensure the design accounts for the specified operating conditions and static/dynamic electrical limits defined in the product data sheet to guarantee reliable performance in the target environment.

Selection Notes

Select this component when TTL-level input compatibility is required alongside automotive reliability standards. The HCT variant ensures proper logic level translation compared to HC series options. Consider the SO20 package dimensions if board space allows, or evaluate alternative packages like TSSOP or DHVQFN if different form factors are necessary for the assembly process.

Part Context

This device belongs to the Nexperia 74HCT245-Q100 family of octal bus transceivers. It shares functional similarities with other members of the Q100 series but differs in input logic thresholds due to its HCT technology. The D suffix specifically denotes the SO20 package variant, distinguishing it from PW (TSSOP20) or BQ (DHVQFN20) versions within the same logical family.

Replacement Considerations

Direct substitutes include 74HC245D-Q100 for CMOS-level applications or 74HCT245PW-Q100/74HCT245BQ-Q100 for alternative packaging needs. Verify that any replacement maintains the required AEC-Q100 qualification and package footprint compatibility before integration into the design.

FAQ

What is the input logic level specification for the 74HCT245D-Q100?

The 74HCT245D-Q100 features TTL-level inputs, allowing it to interface directly with standard TTL logic outputs without additional level shifting components.

How is the data flow direction controlled in this transceiver?

Data flow direction is controlled by the DIR (Direction) pin. When DIR is LOW, data flows from A ports to B ports; when DIR is HIGH, data flows from B ports to A ports.

What is the function of the OE pin?

The OE (Output Enable) pin controls the state of the outputs. A HIGH signal on OE forces all outputs into a high-impedance OFF-state, effectively disconnecting them from the bus.