NXT4556AURZ

Translators, Level Shifters Overview

The NXT4556AUR is a SIM card interface level translator designed to connect a host microcontroller with a SIM card or eSIM. It features three dedicated level translators for Data, Reset (RST), and Clock (CLK) signals. The device supports Class-B and Class-C SIM cards with VCC_SIM ranging from 1.62 V to 3.3 V and VCC_HOST from 1.08 V to 1.98 V. It operates within an ambient temperature range of -40 °C to +85 °C and utilizes capacitance isolation for automatic level translation.

Translators, Level Shifters Feature Summary

• Automatic bidirectional level translation for I/O, RST, and CLK signals between host and SIM interfaces using capacitance isolation.
• Integrated shutdown sequence compliant with ISO-7816-3 triggered by VCC_SIM power-down to ensure proper SIM card disabling.
• Built-in EMI filters on output drivers to suppress higher harmonics and reduce interference with mobile communications.
• Robust electrostatic discharge protection exceeding 8 kV contact and 15 kV air discharge on all SIM-side pins.

Translators, Level Shifters Applications

• Mobile and personal phones
• Wireless modems
• SIM card terminals

Translators, Level Shifters Procurement Notes

Verify the package type SOT8057-1 (WLCSP9) matches the target PCB footprint. Confirm that the operating voltage ranges align with the specific host controller and SIM card requirements. Ensure compliance with RoHS and Dark Green standards if required by the design specifications.

Translators, Level Shifters Selection Notes

Select this component when interfacing low-voltage hosts with standard SIM voltages requiring automatic direction control. The integrated pull-up resistors eliminate external components. Verify that the WLCSP9 package size fits the available board space constraints.

Translators, Level Shifters Part Context

Manufactured by Nexperia USA Inc., the NXT4556AUR belongs to the NXT4556 series of SIM interface solutions. It is housed in a wafer level chip-scale package (WLCSP9) designated as SOT8057-1. The device is marked with code z6 and is intended for production use.

Translators, Level Shifters Replacement Considerations

NXT4556AURZ

Translators, Level Shifters FAQ

How does the device handle SIM card power-down?

When VCC_SIM drops below the UVLO threshold, the device initiates a shutdown sequence per ISO-7816-3, sequentially pulling RST_SIM, CLK_SIM, and IO_SIM LOW via internal pull-down resistors.

What is the maximum clock frequency supported?

The device supports clock frequencies up to 25 MHz and data rates up to 5 Mbps in push-pull mode.