74HCT245D,653

Overview

The Nexperia 74HCT245D,653 is an octal bus transceiver with 3-state outputs housed in a SO20 (SOT163-1) package. 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 non-inverting data transfer controlled by Direction (DIR) and Output Enable (OE) inputs. Static characteristics specify HIGH-level input voltage thresholds of 2.0 V minimum and LOW-level input voltage thresholds of 0.8 V maximum at the recommended operating conditions.

Feature Summary

• Octal bidirectional bus interface with non-inverting 3-state outputs
• TTL-compatible input levels for direct interfacing with TTL logic systems
• Direction control via DIR pin and high-impedance OFF-state via active LOW OE pin
• ESD protection exceeding 2000 V (HBM) and 1000 V (CDM) per JEDEC standards

Applications

• High-noise immunity industrial communication bus interfaces
• CMOS low power dissipation memory data bus driving
• Digital signal routing between microcontrollers and peripheral devices

Procurement Notes

Verify the specific ordering suffix 653 against current Nexperia documentation to confirm tape-and-reel packaging specifications and lot traceability requirements. Ensure the procurement request explicitly cites the SO20 package type (SOT163-1) to distinguish it from TSSOP or QFN variants within the same logical family. Cross-reference the revision history to ensure compliance with the latest ESD specification updates.

Selection Notes

Select this component when TTL-level input compatibility is required alongside CMOS output drive capabilities. The 74HCT245 variant is distinct from the 74HC245 due to its specific input threshold voltages defined for 5 V operation. Confirm that the application environment remains within the specified -40 °C to +125 °C temperature range and that the supply voltage does not exceed the 5.5 V maximum limit.

Part Context

This part belongs to the 74HCT series of hex/octal bus transceivers manufactured by Nexperia USA Inc. It shares functional logic with the 74HC245 but utilizes HCT input structures for TTL compatibility. The 'D' designation indicates the SO20 plastic small outline package, while the ',653' suffix typically denotes reel packaging configuration as defined in the official ordering information table.

Replacement Considerations

Direct functional substitutes include other 74HCT245 parts from compatible manufacturers offering identical pinouts and electrical specifications. Verify package compatibility if replacing the SO20 variant with alternative packages like TSSOP20, ensuring mechanical fit and thermal performance remain adequate for the target application.