Nexperia NXT4557 SIM Card Interface Level Translator with ENABLE pin

Nexperia NXT4557 SIM Card Interface Level Translator is built for interfacing a SIM card with a single low-voltage host-side interface. The NXT4557 consists of three-level translators to convert the data, RST, and CLK signals between a SIM card and a host microcontroller. The translator features a high-speed level translation capable of supporting class-B, class-C SIM cards, and HIGH EN pin that enables the normal operation of the translator. The device is compliant with all ETSI, IMT-2000, and ISO-7816 SIM/Smart card interface requirements. Typical applications include a wide range of SIM card-attached devices, including mobile and personal phones, wireless modems, and SIM card terminals.


  • Support SIM cards and eSIM with supply voltages 1.62V to 3.3V
  • 1.08V to 1.98V host micro-controller operating voltage range
  • Automatic level translation of I/O, RST, and CLK between SIM card and host side interface with capacitance isolation
  • Incorporates shutdown feature for the SIM card signals according to ISO-7816-3
  • High Vdis(UVLO_AC) switching level, arranging quick shut down when VCC_SIM powers down
  • Integrated pull-up resistors; no external resistor required
  • Integrated EMI Filters suppress higher harmonics of digital I/Os
  • A HIGH EN signal enables the translation of the signals
  • Low current shutdown mode <1μA
  • Supports clock speed beyond 5MHz clock
  • Pb-free, Restriction of Hazardous Substances (RoHS) compliant, and free of halogen and antimony (Dark Green compliant)
  • ESD protection:
    • HBM ANSI/ESDA/JEDEC JS-001 exceeds 2kV
    • CDM ANSI/ESDA/JEDEC JS-002 exceeds 1kV
    • IEC61000-4-2 level 4, contact and air discharge on all SIM card-side pins are 8kV and 15kV
  • Available in a 10-pin XQFN package

Block Diagram

Application Circuit

more information:

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