FST3245MTCX

Overview

The FST3245MTCX is an 8-bit bus switch manufactured by onsemi, housed in a 20-lead Thin Shrink Small Outline Package (TSSOP). It operates within a supply voltage range of 4.0 V to 5.5 V and supports an operating temperature range from -40°C to +85°C. The device features a typical on-resistance of 4 Ω at 4.5 V and minimal propagation delay of 0.25 ns. Control inputs are TTL-compatible, and the package width is 4.4 mm.

Feature Summary

• Provides eight bits of high-speed CMOS bus switching with standard '245 pin-out compatibility.
• Features low on-resistance to connect inputs to outputs without adding propagation delay or generating ground bounce noise.
• Control inputs are compatible with TTL levels for simplified interface integration.

Applications

• High-speed data bus switching applications
• Portable systems requiring low power consumption
• Consumer electronics utilizing standard logic interfaces

Procurement Notes

Verify the specific ordering suffix against current ON Semiconductor documentation, as Fairchild part numbers may have been updated during system integration. Confirm that the TSSOP package dimensions and tape and reel specifications match your manufacturing requirements. Ensure compliance with RoHS directives and check for any recent datasheet revisions affecting electrical characteristics or mechanical drawings before finalizing procurement.

Selection Notes

Select this component when an 8-bit bidirectional bus switch is required with minimal signal distortion. The device is suitable for applications needing TTL-compatible control signals and low quiescent current. Consider the 4.4 mm wide TSSOP package for space-constrained designs. Validate performance under specific load capacitance and input rise/fall time conditions defined in the AC Electrical Characteristics section.

Part Context

The FST3245 belongs to the FST series of high-speed bus switches originally developed by Fairchild Semiconductor. Following the acquisition, ON Semiconductor manages the product line, updating nomenclature by replacing underscores with dashes in part numbers. This specific model represents an 8-bit configuration designed for general-purpose bus switching in consumer and portable electronic devices.

Replacement Considerations

Check the official ON Semiconductor website for updated part numbers resulting from the Fairchild integration. Verify pinout compatibility if substituting with other 8-bit bus switches. Ensure replacement components meet the same voltage, temperature, and package specifications.

FAQ

How does the /OE pin control the FST3245MTCX?

When the /OE (Output Enable) pin is LOW, the switch connects Port A to Port B. When /OE is HIGH, the switch disconnects the ports, placing them in a high-impedance state.

What is the maximum operating supply voltage for this device?

The recommended operating condition specifies a maximum VCC of 5.5 V. The absolute maximum rating allows up to 7.0 V, but operation above 5.5 V is not recommended.