SIM card interface level translator with enable pin

The NXT4557 device is built for interfacing a SIM card with a single low-voltage host side interface. The NXT4557 has three level translators to convert the data, RST and CLK signals between a SIM card and a host microcontroller. A high speed level translation capable of supporting class-B, class-C SIM cards. An active HIGH EN pin enables normal operation of the translator. A HIGH to LOW transition on pin EN initiates a shutdown sequence on SIM card pins in accordance with ISO-7816-3.

The NXT4557 is compliant with all ETSI, IMT-2000 and ISO-7816 SIM/Smart card interface requirements.

Features and benefits

  • Support SIM cards and eSIM with supply voltages 1.62 V to 3.3 V
  • Host micro-controller operating voltage range: 1.08 V to 1.98 V
  • 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 suppresses higher harmonics of digital I/O's
  • A HIGH EN signal enables the translation of the signals
  • Low current shutdown mode < 1 μA
  • Supports clock speed beyond 5 MHz 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 2 kV
    • CDM ANSI/ESDA/JEDEC JS-002 exceeds 1 kV
    • IEC61000-4-2 level 4, contact and air discharge on all SIM card-side pins are 8kV and 15 kV
  • Available in 10-pin XQFN package


  • NXT4557 can be used with a range of SIM card attached devices including:
    • Mobile and personal phones
    • Wireless modems
    • SIM card terminals


Type numberProduct statusVCC(A) (V)VCC(B) (V)Logic switching levelsOutput drive capability (mA)tpd (ns)Nr of bitsPower dissipation considerationsTamb (°C)Rth(j-a) (K/W)Ψth(j-top) (K/W)Rth(j-c) (K/W)Package name
NXT4557GUProduction1.08 - 1.981.62 - 3.3CMOS± 1203low-40~851185.1144XQFN10


Type numberPackagePackage informationReflow-/Wave solderingPackingStatusMarkingOrderable part number, (Ordering code (12NC))
Reel 7” Q1/T1 or Q2/T3Activez7NXT4557GUX
( 9356 911 91115 )

Quality, reliability & chemical content

Type numberOrderable part numberChemical contentRoHS / RHFLeadfree conversion dateMSLMSL leadfree
Quality and reliability disclaimer

Documentation (2)

File nameTitleTypeDate
NXT4557SIM card interface level translator with enable pinData sheet2022-06-08
nxt4557NXT4557 IBIS modelIBIS model2021-08-31


Find answers to your design questions on this page. If available you can find information in our Nexperia Support Community or you can find Nexperia models and Design tools.


File nameTitleTypeDate
nxt4557NXT4557 IBIS modelIBIS model2021-08-31

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