MAX14978ETO+T

Analog Switches - Special Purpose Overview

The MAX14978ETO+T is a SuperSpeed USB passive analog switch designed for routing Low/Full/Hi-Speed (1.5/12/480Mbps) and SuperSpeed (5.0Gbps) data between one source and two loads. It operates from a single +3.3V supply with VCC ranging from 3.0V to 5.5V and VDD from 3.0V to 3.6V. The device features low insertion loss, superior return loss, and preserves all SuperSpeed link training. It includes overvoltage fault protection on Hi-Speed COMD_ pins and offers ESD protection up to ±15kV HBM on COMD+/COMD-. Packaged in a 42-pin TQFN-EP (3.5mm x 9.0mm), it functions within an extended temperature range of -40°C to +85°C.

Analog Switches - Special Purpose Feature Summary

• Dual independent digital control inputs (SEL1, SEL2) allow separate switching of Hi-Speed and SuperSpeed signal paths.
• Integrated overvoltage fault protection on Hi-Speed USB switches prevents damage from shorts to the USB VBUS voltage rail.
• Extended electrostatic discharge (ESD) protection on Hi-Speed common ports ensures robustness against high-voltage static events.
• Low quiescent current consumption supports power-efficient designs in portable and desktop applications.

Analog Switches - Special Purpose Applications

• Desktop PCs
• Laptop PCs
• Industrial USB Switching

Analog Switches - Special Purpose Procurement Notes

Verify the component authenticity by checking the marking code and package integrity upon receipt. Confirm that the ordering suffix matches the specified lead-free/RoHS-compliant status. Ensure the exposed pad is properly connected to ground during assembly to maintain thermal performance and electrical grounding as defined in the datasheet specifications.

Analog Switches - Special Purpose Selection Notes

Select this component when designing systems requiring bidirectional switching of SuperSpeed USB 3.0 signals alongside legacy USB 2.0 lines. Ensure the logic interface voltage meets the LVCMOS requirements, specifically a VIH minimum of 1.4V. Verify that the PCB layout adheres to impedance control guidelines to maintain signal integrity at 5.0Gbps frequencies.

Analog Switches - Special Purpose Part Context

This part belongs to the Maxim Integrated MAX14978 family of SuperSpeed USB passive switches. It is specifically engineered to manage bandwidth congestion in systems with limited SuperSpeed USB ports. The device integrates both Hi-Speed and SuperSpeed analog switches into a single compact package, simplifying board design compared to using discrete switches for each speed tier.

Analog Switches - Special Purpose Replacement Considerations

No public confirmed substitute part numbers are available in the provided documentation.