MC74HCT245ANG

Overview

The MC74HCT245ANG is an octal bus transceiver manufactured by onsemi using high-performance silicon-gate CMOS technology. It features 3-state noninverting outputs and LSTTL-compatible inputs, allowing direct interfacing with TTL or NMOS outputs to High Speed CMOS inputs. The device supports bidirectional asynchronous communication between data buses via a direction control pin and includes an active-low output enable for high-impedance states. It operates within a voltage range of 4.5 V to 5.5 V, offers low input current of 1.0 µA, and provides drive capability for 15 LSTTL loads.

Feature Summary

• Octal 3-State Noninverting Bus Transceiver
• LSTTL Compatible Inputs
• Bidirectional Asynchronous Communication
• Active-Low Output Enable

Applications

• Interfacing TTL or NMOS outputs to High Speed CMOS inputs
• Level conversion applications
• Two-way asynchronous communication between data buses

Procurement Notes

Verify the package type matches the required design specifications, as the 'AN' suffix typically indicates a specific leaded package variant. Confirm RoHS compliance status and check for any specific environmental certifications required by the target application. Ensure the operating temperature range aligns with system thermal constraints before finalizing procurement.

Selection Notes

Select this component when interfacing between different logic families requiring level translation. The HCT series ensures compatibility with standard TTL input levels while providing CMOS output characteristics. Consider the 3-state output feature for bus sharing applications where multiple devices connect to a common data line. Verify that the 4.5V to 5.5V supply voltage range fits the system power architecture.

Part Context

This part belongs to the 74HCT logic family, which bridges the gap between older TTL standards and modern CMOS technologies. It serves as a critical interface component in mixed-signal systems where signal integrity across different voltage domains is essential. The octal configuration allows for parallel data transfer, making it suitable for wide data bus architectures in computing and industrial control systems.

Replacement Considerations

Direct pin-compatible replacements include other manufacturers' 74HCT245 variants. Ensure substitute parts maintain the same 3-state output capability and LSTTL input compatibility. Verify that alternative components meet the same electrical specifications for propagation delay and output drive strength.