MC74HC646DW

Overview

The MC74HC646DW is an octal bus transceiver from the 74HC series, manufactured by onsemi. It features a single element with eight bits per element and provides three-state outputs. The device operates within a supply voltage range of 2V to 6V and supports surface mount installation in a 24-SOIC package (0.295 inch width). It functions as a non-inverting transceiver with specified output currents of 7.8mA for both high and low states. The component is rated for an operating temperature range of -55°C to +125°C.

Feature Summary

• Octal bus transceiver architecture providing eight-bit data transfer capability
• Three-state outputs enabling direct system bus interconnection without additional drivers
• Non-inverting logic function maintaining signal polarity during transmission

Applications

• Mobile applications requiring wide voltage operation
• Clock driving and buffer applications
• Memory module data bus interfacing

Procurement Notes

Verify RoHS compliance status as documentation indicates potential variations. Confirm package dimensions against the 24-SOIC specification. Check for moisture sensitivity level requirements during storage and handling. Ensure the specific suffix matches the required tape and reel or tube packaging configuration for your assembly process.

Selection Notes

Select this component when an octal transceiver with wide voltage compatibility is required. The HC series offers standard CMOS performance suitable for general-purpose digital interfaces. Consider the 24-SOIC package size for PCB layout constraints. Verify that the 7.8mA output current meets the load requirements of the connected circuitry.

Part Context

This part belongs to the 74HC family of high-speed CMOS logic devices. It serves as a bidirectional data bus interface, commonly used in microprocessor systems. The device facilitates communication between different voltage domains or buffers high-capacitance loads. It is part of a broader line of bus transceivers designed for reliable digital signal transmission.

Replacement Considerations

Check for pin-compatible alternatives from other manufacturers offering similar octal transceiver specifications. Verify electrical parameters such as propagation delay and output drive strength match the original design requirements. Ensure the replacement device supports the same 24-SOIC package and operating temperature range.