TDA8024T-T

Specialized Overview

The TDA8024T is a smart card interface IC designed for asynchronous 3 V or 5 V contact cards. It operates within an ambient temperature range of -25 °C to +85 °C and utilizes a SOIC-28 package. The device features a DC-to-DC converter powered by a separate 5 V ± 20% supply (VDDP) to generate regulated card voltages. It supports clock frequencies up to 20 MHz via a 26 MHz integrated oscillator and provides three protected half-duplex I/O lines. The component includes enhanced ESD protection exceeding 6 kV on card contacts, thermal and short-circuit safeguards, and automatic activation/deactivation sequences.

Specialized Feature Summary

• Integrated DC-to-DC converter generates regulated 3 V or 5 V card supply voltage from a separate power domain
• Built-in 26 MHz crystal oscillator with synchronous frequency division capabilities up to 20 MHz
• Three specifically protected half-duplex bidirectional buffered I/O lines for card communication
• Automatic activation and deactivation sequences triggered by software commands or hardware fault conditions

Specialized Applications

• IC card readers for banking applications
• Electronic payment systems compliant with EMV standards
• Identification devices requiring ISO 7816 compatibility
• Pay TV set-top boxes and related interfaces

Specialized Procurement Notes

Verify the specific suffix against official documentation, as ordering codes may indicate variations in package type or internal configuration such as the presence of external POR adjustment pins. Confirm availability status through authorized distributors, as this component may be subject to discontinuation or limited production runs. Ensure compliance with RoHS directives and handle according to ESD precautions during assembly.

Specialized Selection Notes

Select the TDA8024T when a complete analog interface solution is required for standard contact smart cards without needing complex external circuitry. This component serves as a direct replacement for the TDA8004AT in existing designs. Consider the TDA8024AT variant if external Power-on Reset threshold adjustment via a resistor bridge is not required, as it simplifies the design by leaving the PORADJ pin unconnected internally.

Specialized Part Context

The TDA8024 belongs to NXP's TDA series of contact smart card reader ICs, which are industry leaders in providing cost-efficient interfaces for banking and payment applications. This series defines benchmarks for security and reliability in embedded systems. The TDA8024 represents a standard implementation offering high integration, reducing the bill of materials while maintaining strict adherence to GSM11.11 and EMV protocols for secure data exchange.

Specialized Replacement Considerations

The TDA8024AT is documented as a direct replacement for the TDA8004AT. Designers upgrading from older generations should verify pin compatibility and functional equivalence regarding the absence of the external POR adjustment feature in the AT variant.