Smart card interface

The ST8024L is a complete low-cost analog interface for asynchronous Class A, B, and C smartcards. It can be placed between the card and the microcontroller with few external components to perform all supply protection and control functions. The ST8024LCDR and ST8024LCTR are compatible with the ST8024 (with the exception of Vth(ext)rise/fallvalue).

Key Features

  • Designed to be compatible with the NDS conditional access system (except ST8024LTR)
  • ISO 7816, GSM11.11 and EMV 4.2 (payment systems) compatible
  • IC card interface
  • 3 V or 5 V supply for the ST8024L device (VDD )
  • Three specifically protected half-duplex bi-directional buffered I/O lines to card contacts C4, C7 and C8
  • Step-up converter for VCC generation separately powered by a 5 V ± 20% supply (VDDP and PGND)
  • 1.8 V ± 6.5%, 3 V or 5 V ± 5% regulated card supply voltage (VCC ) with appropriate decoupling has the following capabilities:
    • ICC < 80 mA at VDDP = 4.75 to 6.5 V
    • Handles current spikes of 40 nA up to 20 MHz
    • Controls rise and fall times
    • Filtered overload detection at ~120 mA
  • Thermal and short-circuit protection on all card contacts
  • Automatic activation and deactivation sequences; initiated by software or by hardware in the event of a short-circuit, card take-off, overheating, VDD or VDDP dropout
  • Enhanced ESD protection on card side (>6 kV)
  • 26 MHz integrated crystal oscillator
  • Built-in debounce on card presence contacts
  • One multiplexed status signalOFF
  • Non-inverted control of RST via pin RSTIN
  • Clock generation for cards up to 20 MHz (divided by 1, 2, 4 or 8 through CLKDIV1 and CLKDIV2 signals) with synchronous frequency changes
  • Supply supervisor for spike-killing during power-on and power-off and power-on reset (threshold fixed internally or externally by a resistor divider)

Circuit Diagram

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Technical Documentation

Product Specifications
Description Version Size
DS6888 DS6888: Smartcard interface 5.0 704 KB
Application Notes
Description Version Size
AN3275 AN3275: Improving the performance of smartcard interfaces using the ST8024L 1.1 1 MB
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Sample & Buy

Part Number Package Packing Type Operating Temperature (°C) (min) Operating Temperature (°C) (max) Marketing Status Unit Price (US$) * Quantity ECCN (EU) ECCN (US) Country of Origin More info Order from ST Order from Distributors
ST8024LCDR SO-28 Tape And Reel -25 85 Active 0.78 1000 NEC EAR99 MALAYSIA MORE INFO No availability reported, please contact our Sales office
ST8024LCTR TSSOP28 9.7 x 4.4 Tape And Reel -25 85 Active 0.78 1000 NEC EAR99 - MORE INFO DISTRIBUTOR AVAILABILITY
ST8024LTR TSSOP 20 Tape And Reel -25 85 Active 0.65 1000 NEC EAR99 - MORE INFO DISTRIBUTOR AVAILABILITY

(*) Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office  or our Distributors

Quality & Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
ST8024LCDR ActiveSO-28IndustrialEcopack1 0 0
ST8024LACDR ActiveSO-28IndustrialEcopack1
ST8024LCTR ActiveTSSOP28 9.7 x 4.4IndustrialEcopack3 0 0
ST8024LTR ActiveTSSOP 20IndustrialEcopack1 0 0

(**) The Material Declaration forms available on may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.