MC74AC646DWG

Overview

The MC74AC646DWG is an octal bus transceiver from the AC logic series, manufactured by onsemi. It features a single functional unit with eight bidirectional data channels in a non-inverting configuration. The device operates within a supply voltage range of 2V to 6V and utilizes a 24-pin SOIC surface-mount package. Key electrical characteristics include maximum high-level output current of -24mA and low-level output current of 24mA. Propagation delay is specified at 16.5ns. The component supports a wide operating temperature range from -40°C to +85°C.

Feature Summary

• Provides bidirectional data transmission across eight independent channels with non-inverting polarity.
• Integrates tri-state outputs to facilitate efficient bus-oriented memory and communication systems.
• Supports mixed signal operation through TTL-compatible input levels paired with CMOS output levels.

Applications

• Bus-oriented memory and communication systems
• Multiplexed data transmission applications
• Control signal driving and buffering

Procurement Notes

Verify the specific suffix 'DWG' to confirm the tape-and-reel packaging format and lead-free status. Ensure the design accommodates the 2V to 6V supply range requirements. Confirm that the 24-SOIC footprint matches the PCB layout specifications. Check for RoHS compliance documentation if required by regulatory standards.

Selection Notes

Select this component when an octal transceiver with tri-state control is required for system buses. The AC series offers a balance of speed and power consumption suitable for general-purpose digital interfaces. Consider the 24-pin package size constraints during mechanical design. Verify that the input voltage thresholds align with the source logic family.

Part Context

This part belongs to the MC74AC646 family of registered bus transceivers. It serves as a critical interface element in digital circuits requiring data latching and direction control. The device complements other logic families like ACT and AC variants within the manufacturer's portfolio for scalable system designs.

Replacement Considerations

MC74ACT646DWG is listed as a parameter-equivalent substitute. Verify voltage compatibility as the ACT variant typically operates at 4.5V to 5.5V, whereas the AC version supports 2V to 6V. Ensure pinout and package dimensions remain identical for direct replacement.