Low-Voltage SIM/Smart-Card Level Translators in µMAX

Low-Voltage, High-Speed, SIM/Smart-Card Level Translator

Please check latest availability status for a specific part variant.


The MAX1840/MAX1841 subscriber identity module (SIM)/smart card level translators provide level shifting and electrostatic discharge (ESD) protection for SIM and smart card ports. These devices integrate two unidirectional level shifters for the reset and clock signals, a bidirectional level shifter for the serial data stream, and ±10kV ESD protection on all card contacts.

The MAX1840 includes a SHDN control input to aid insertion and removal of SIM and smart cards, while the MAX1841 includes a system-side data driver to support system controllers without open-drain outputs. The logic supply voltage range is +1.4V to +5.5V for the "controller side" and +1.7V to +5.5V for the "card side." Total supply current is 1.0µA. Both devices automatically shut down when either power supply is removed. For a complete SIM card interface, combine the MAX1840/MAX1841 with the MAX1686H 0V/3V/5V regulated charge pump.

The MAX1840/MAX1841 are available in ultra-small 10-pin µMAX packages that are only 1.09mm high and half the area of an 8-pin SO.

The MAX1840/MAX1841 are compliant with GSM test specifications 11.11 and 11.12.
MAX1840, MAX1841: Typical Operating Circuit MAX1840, MAX1841: Typical Operating Circuit Enlarge+

Key Features

  • SIM/Smart Card Level Shifting
  • +1.4V to +5.5V Controller Voltage Range
  • +1.7V to +5.5V Card Voltage Range
  • ±10kV ESD Card Socket Protection
  • Allows Level Translation with DVCC > VCC or DVCC < VCC
  • Automatically Shuts Down When Either Supply Is Removed
  • Card Contacts Actively Pulled Low During Shutdown
  • 1µA Total Quiescent Supply Current
  • 0.01µA Total Shutdown Supply Current
  • Ultra-Small 10-Pin µMAX Package
  • Compliant with GSM Test Specifications 11.11 and 11.12


  • Logic-Level Translation
  • SIM Interface in GSM Cellular Telephones
  • Smart Card Readers
  • SPI™, QSPI™, and MICROWIRE™ Level Translation

See parametric specs for SIM/Smart Card Level Translators (4)

Part NumberVCC
Level ShiftersPackage/PinsOper. Temp.
(Logic)(Card)(max)(See Notes)
MAX1840 1.4 to 5.51.7 to 5.53.5
1 Bidirectional
2 Unidirectional
-40 to +85$1.70 @1k
$1.90 @1k

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Technical Documents

App Note 3007 Logic-Level Translation
App Note 1157 Parallel-Port Interface Powers Low Voltage Systems
Request Reliability Report for: MAX1841 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

Quality Management System >
Environmental Management System >


Related Resources