NVT4557HKX

Specialized Overview

The NVT4557HKX is a SIM card interface level translator manufactured by NXP Semiconductors in an XQFN10 package. It provides automatic voltage translation between a host microcontroller operating at 1.08 V to 1.98 V and a SIM card supply of 1.62 V to 3.6 V. The device supports clock speeds up to 10 MHz with a typical propagation delay of 8 ns. It includes integrated EMI filters, pull-up/pull-down resistors, and 8 kV IEC 61000-4-2 Level 4 ESD protection on all SIM-side pins.

Specialized Feature Summary

• Automatic bidirectional level translation for data, reset, and clock signals between low-voltage hosts and SIM cards
• Integrated EMI filtering to suppress digital I/O harmonics and protect sensitive mobile communication circuits
• Robust electrostatic discharge protection meeting IEC 61000-4-2 Level 4 standards without stressing the host side
• Compliance with ISO-7816-3 shutdown sequences and automatic enable/disable logic based on SIM supply voltage

Specialized Applications

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

Specialized Procurement Notes

Verify the specific ordering suffix HKX corresponds to the XQFN10 package variant when sourcing components. Confirm that the revision history indicates production status rather than development or qualification phases. Ensure compatibility with lead-free manufacturing processes as the device is RoHS compliant and halogen-free.

Specialized Selection Notes

Select this component when interfacing 1.08 V to 1.98 V host controllers with 1.62 V to 3.6 V SIM interfaces requiring high-speed translation up to 10 MHz. The XQFN10 package is suitable for designs needing an explicit hardware enable pin (EN) compared to the auto-enable WLCSP version. Consider the integrated EMI filters if strict electromagnetic interference suppression is required for the SIM interface.

Specialized Part Context

This part belongs to the NVT4557 series of voltage level translators designed specifically for SIM card applications. It differs from the NVT4557UK variant primarily by its XQFN10 package type and the inclusion of a dedicated Enable pin, whereas the UK variant uses a smaller WLCSP9 footprint with internal pull-ups.

Specialized Replacement Considerations

NVT4557UK serves as a functional alternative within the same family but utilizes a WLCSP9 package and lacks the external EN pin found on the HKX variant.