MAX4890EETJ+

Analog Switches - Special Purpose Overview

The MAX4890EETJ+ is a high-speed analog switch designed for Gigabit Ethernet (10/100/1000 Base-T) and LVDS/LVPECL applications. It features ±15kV ESD protection per MIL-STD-883, Method 3015. The device operates on a single +3.0V to +3.6V supply with a maximum quiescent current of 450µA. Key electrical parameters include an on-resistance (RON) of 4Ω typical and 6.5Ω maximum, and an on-capacitance (CON) of 8pF typical. It provides a -3dB bandwidth of 650MHz and a -23dB return loss at 100MHz. The component is housed in a 32-pin, 5mm x 5mm TQFN package with an exposed pad.

Analog Switches - Special Purpose Feature Summary

• Enhanced electrostatic discharge protection rated at ±15kV Human Body Model
• Ultra-low on-capacitance and on-resistance for minimal signal insertion loss
• Integrated bidirectional multiplexer/demultiplexer architecture
• Optimized pinout configuration for direct transformer and PHY interface

Analog Switches - Special Purpose Applications

• Notebook computers and docking stations
• Servers and routers with Ethernet interfaces
• Board-level redundancy protection
• SONET/SDH signal routing
• T3/E3 redundancy protection

Analog Switches - Special Purpose Procurement Notes

Verify the specific ordering suffix ETJ against the manufacturer's official documentation to confirm the 32-pin TQFN package type. Ensure that the selected variant aligns with the required application constraints regarding ESD protection levels and power supply voltage ranges before finalizing procurement decisions.

Analog Switches - Special Purpose Selection Notes

Select this component when designing systems requiring robust ESD protection for external Ethernet connections. The low capacitance characteristics make it suitable for maintaining signal integrity in high-frequency differential switching environments. Confirm compatibility with the target system's operating temperature range of -40°C to +85°C during the design phase.

Analog Switches - Special Purpose Part Context

This part belongs to the MAX4890E/MAX4892E family of LAN switches. It serves as a pin-for-pin equivalent to the non-E versions but includes enhanced ESD protection capabilities. The MAX4890E variant specifically lacks the LED switching functionality found in the MAX4892E model, focusing solely on the eight pairs of DPDT switches for data routing.

Analog Switches - Special Purpose Replacement Considerations

The MAX4890EETJ+ can replace the standard MAX4890 devices where enhanced ESD protection is required. Verify that the replacement maintains the same 32-pin TQFN footprint and thermal dissipation requirements for the specific board layout.

Analog Switches - Special Purpose FAQ

Does the MAX4890EETJ+ include built-in LED switches?

No, the MAX4890E variant does not include LED switches. This feature is exclusive to the MAX4892E model within the same family.

What is the specified ESD protection level for this device?

The device provides ±15kV ESD protection per the Human Body Model, tested according to MIL-STD-883, Method 3015.

How does the internal charge pump affect the design?

The internal two-stage charge pump eliminates the need for external flyback capacitors, reducing board space, design time, and overall system cost.