USB3740B-AI2-TR

Controllers Overview

The USB3740B is a USB 2.0 compliant High Speed switch designed to multiplex USB lanes between different functions, such as switching a connector between two distinct hosts or accessories. It integrates robust ESD protection on DP and DM pins, rated at 8kV HBM, eliminating the need for external protection components. The device operates with an extremely low active/standby current of 30nA using flexPWR technology. It supports a supply voltage range of 3.0V to 5.5V and features a bandwidth up to 1GHz. The component is available in 10-pin QFN packages (1.3x1.8mm or 1.6x2.1mm) and operates within a temperature range of -40°C to +85°C.

Controllers Feature Summary

• High-speed USB 2.0 mux capability supporting up to 1GHz bandwidth for clean signal transmission
• Integrated ESD protection on data lines providing 8kV Human Body Model robustness
• Ultra-low power consumption with 30nA standby current via flexPWR technology
• Dual input configuration allowing selection between two USB sources via digital control

Controllers Applications

• Multiplexing USB connections between a host processor and mobile accessories
• Portable battery-powered devices requiring minimal standby current drain
• Systems needing integrated ESD protection to reduce bill of materials and PCB area

Controllers Procurement Notes

Verify the specific package pitch required for your design, as the AI2 suffix denotes a 0.4mm pitch QFN while other variants may use 0.5mm pitch. Confirm that the tape and reel quantity matches your production needs, as standard reels contain 3,000 units. Ensure the operating environment stays within the specified -40°C to +85°C range to maintain electrical specifications.

Controllers Selection Notes

Select this component when a single USB port must be shared between multiple upstream devices without external switching logic. The 30nA standby current makes it suitable for always-on portable electronics. Verify that the control logic levels (1.4V high threshold) are compatible with the driving microcontroller outputs before finalizing the schematic.

Controllers Part Context

This part belongs to Microchip's family of USB interface switches. Unlike the USB3751A which focuses on battery charging detection, the USB3740B emphasizes high-speed data integrity and ultra-low leakage. It serves as a direct replacement for legacy SMSC USB muxes in designs requiring compact footprints and integrated protection.

Controllers Replacement Considerations

Public confirmed substitute part numbers are not provided in the source documentation. Designers should consult Microchip sales offices for cross-reference information regarding legacy SMSC equivalents or alternative high-speed mux solutions.

Controllers FAQ

What is the maximum ESD protection rating for the data lines?

The USB3740B provides ESD protection rated at 8,000 Volts under the Human Body Model (HBM) specification.

How does the device handle signal direction?

The USB3740B is a bidirectional switch controlled by OE_N and S inputs, allowing it to pass USB signals from either input pair (DP_1/DM_1 or DP_2/DM_2) to the common output (DP/DM).

What is the typical off-isolation performance?

At 250MHz with a 50-ohm load, the typical off-isolation is -32 dB, ensuring minimal signal leakage between disconnected paths.