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NXP Semiconductors TDA8024AT/C1,112
- Part No.:
- TDA8024AT/C1,112
- Manufacturer:
- NXP Semiconductors
- Category:
- Specialized
- Package:
- -
- Datasheet:
-
TDA8024AT/C1,112.pdf
- Description:
- IC SMART CARD INTERFACE 28SOIC
- Quantity:
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Inventory:2,462
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Product details
Overview
TDA8024AT/C1,112 from NXP Semiconductors is a complete analog smart card interface IC designed to sit between ISO 7816-compliant cards and host microcontrollers. It delivers regulated 3 V or 5 V card supply (VCC), integrates a 26 MHz crystal oscillator, provides three protected bidirectional I/O lines (C4/C7/C8), and implements automatic hardware-controlled activation/deactivation sequences - enabling secure banking card readers and EMV payment terminals with minimal external components.
For engineers reviewing the TDA8024AT/C1,112 datasheet, TDA8024AT/C1,112 pinout, TDA8024AT/C1,112 application, or TDA8024AT/C1,112 equivalent, this device serves as a drop-in replacement for TDA8004AT in SO28-packaged smart card interfaces requiring ISO 7816-3, GSM11.11, and EMV compliance, precise VCC regulation (±5%), thermal/short-circuit protection on all card contacts, and synchronous clock division (÷1/2/4/8).
Technical Context
The TDA8024AT/C1,112 implements a dual-mode DC-to-DC converter (voltage follower/doubler) that generates stable 3 V or 5 V card supply from a 4.0–6.5 V VDDP input, with built-in ripple filtering (≤350 mV p-p) and overload detection at ~120 mA. Its clock circuitry accepts up to 26 MHz crystal or external clock input and supports synchronous frequency division via CLKDIV1/CLKDIV2 control pins.
Three half-duplex transceivers (I/O, AUX1, AUX2) feature active pull-up (11 kΩ to VCC), 15 mA current limiting, and master/slave arbitration logic to prevent bus contention; all card-side pins include >6 kV HBM ESD protection and thermal/short-circuit monitoring, triggering automatic deactivation on fault detection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Output | Regulated 3.0 V ±5% or 5.0 V ±5%; supports 65 mA (3 V) or 80 mA (5 V) continuous load with filtered 120 mA overload detection |
| VDD Supply Range | 2.7 V to 6.5 V; powers internal logic and host-side I/O (I/OUC, AUX1UC, AUX2UC) |
| VDDP Input Range | 4.0 V to 6.5 V; dedicated supply for DC-to-DC converter driving VCC generation |
| Crystal Frequency | Up to 26 MHz; integrated oscillator eliminates need for external clock source |
| CLK Division | ÷1, ÷2, ÷4, or ÷8 via CLKDIV1/CLKDIV2; synchronous switching avoids clock glitches during dynamic reconfiguration |
| ESD Protection | >6 kV HBM on card-side pins (I/O, RST, AUX1, AUX2, CLK, PRES); meets ISO 7816-3 mechanical and electrical robustness requirements |
| Operating Temp | −25 °C to +85 °C ambient; validated for industrial and payment terminal environments |
Pinout & Package
Package: SO28 - plastic small outline package, 28 leads, body width 7.5 mm (SOT136-1). Pin 18 (PORADJ) is not connected in TDA8024AT/C1,112, distinguishing it from non-AT variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 CLKDIV1 | Input | MSB of 2-bit clock divider control; sets fCLK = fXTAL ÷ {1,2,4,8} in combination with CLKDIV2 |
| 3 5V/3V | Input | Selects VCC output voltage: HIGH = 5 V, LOW = 3 V; configures DC-to-DC converter operating mode |
| 6 VDDP | Supply | Dedicated input for DC-to-DC converter; must be decoupled with low-ESR capacitor to PGND |
| 11 I/O | I/O | Buffered bidirectional data line to card contact C7; includes 11 kΩ pull-up to VCC and short-circuit protection |
| 15 CLK | Output | Card clock signal to contact C3; duty cycle guaranteed 45–55% across all division ratios |
| 16 RST | Output | Reset signal to card contact C2; driven by internal sequencer during activation/deactivation |
| 17 VCC | Supply | Regulated card supply output to contact C1; requires dual 100 nF capacitors (ESR < 100 mΩ) to CGND |
| 20 RSTIN | Input | Host-provided reset signal; non-inverted control enables precise ATR timing synchronization |
| 23 OFF | Output | NMOS interrupt output (active LOW); signals card presence (HIGH) or fault/emergency deactivation (LOW) |
| 24 XTAL1 | Input | Crystal or external clock input; starts 26 MHz oscillator upon power-up |
Key Features
| Feature | Design Value |
|---|---|
| ISO 7816-3 / EMV / GSM11.11 Compliance | Fully implements electrical, timing, and protocol requirements for payment, ID, and telecom smart cards without firmware adaptation |
| Hardware Activation/Deactivation Sequencing | Automatically executes 7-step activation (VCC ramp, CLK enable, RST assert) and 7-step deactivation (RST release, CLK stop, VCC discharge) on CMDVCC edge - eliminating software timing-critical code |
| Integrated 26 MHz Oscillator | Removes need for external crystal or clock source; supports up to 20 MHz card clock after division, meeting EMV Level 1 timing budgets |
| Card Presence Debounce | Built-in 8 ms typ. hardware debounce on dual PRES inputs prevents false card-insertion/extraction detection in mechanical readers |
| Thermal & Short-Circuit Protection | Monitors all card contacts continuously; triggers immediate emergency deactivation on overtemperature or VCC short, preventing card damage |
| DC-to-DC Converter Flexibility | Auto-selects voltage follower (VDDP ≥5.8 V for 5 V VCC) or doubler (VDDP ≤5.7 V) mode - simplifies power architecture across 5 V and 3.3 V host systems |
Applications
| Banking Card Readers | EMV Payment Terminals |
|---|---|
Use Scenario: Contact-based credit/debit card transaction in point-of-sale (POS) hardware. IC Role / Device Role / Timing Role: Smart card interface controller managing VCC supply, CLK generation, RST sequencing, and I/O buffering per ISO 7816-3 timing constraints. Use Value: Enables certified EMV Level 1 compliance with zero external timing components and guaranteed 45–55% CLK duty cycle for reliable ATR parsing. |
Use Scenario: Secure chip-and-PIN authentication in unattended kiosks or fuel pumps. IC Role / Device Role / Timing Role: Fault-tolerant card interface providing thermal shutdown, short-circuit protection, and automatic deactivation on card removal to prevent transaction corruption. Use Value: Eliminates risk of card latch-up or EEPROM corruption during hot insertion/removal, meeting PCI PTS v6.0 physical security requirements. |
| Government ID Systems | Pay TV Conditional Access |
Use Scenario: National eID card reading in border control or citizen service terminals. IC Role / Device Role / Timing Role: Dual-voltage (3 V/5 V) interface supporting legacy and modern ID cards; handles card presence detection via redundant PRES inputs. Use Value: Hardware debounce and dual-presence sensing ensure reliable operation with high-cycle mechanical connectors used in public infrastructure. |
Use Scenario: Subscriber smart card interface in set-top boxes for encrypted content access. IC Role / Device Role / Timing Role: Low-power card interface with 1.2 mA typical supply current (card inactive) and NMOS OFF interrupt signaling card status to host MCU. Use Value: Reduces standby power consumption while maintaining instant card presence awareness - critical for always-on consumer electronics. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar smart card interface applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TDA8024T/C1 | Identical functionality and pinout; differs only in PORADJ pin - TDA8024T supports external reset threshold adjustment via resistor bridge, while TDA8024AT/C1,112 has PORADJ internally disconnected | Required where programmable Power-on Reset pulse width (8 ms vs. 16 ms) or custom VDD dropout thresholds are needed | Select TDA8024T/C1 only if external POR threshold tuning is required; otherwise TDA8024AT/C1,112 offers simpler layout and identical core performance |
| SLB9670 | Trusted Platform Module (TPM) with integrated secure crypto engine; lacks analog smart card interface functions (VCC generation, CLK division, I/O transceivers) | Designed for platform authentication, not direct card interfacing; requires external interface IC for smart card support | Not a functional alternative; SLB9670 serves complementary security layer - use only alongside a dedicated interface IC like TDA8024AT/C1,112 |
Compared with TDA8024T/C1 and SLB9670, the TDA8024AT/C1,112 delivers fully self-contained ISO 7816 analog interface functionality in SO28 with no external POR tuning needed, whereas TDA8024T adds configurability at minor BOM cost, and SLB9670 addresses entirely different (cryptographic) system-level requirements.
Availability
TDA8024AT/C1,112 is available at Aetrix Electronics and suitable for banking card readers, EMV payment terminals, and government ID systems requiring stable component supply, long-term lifecycle support, and ISO 7816-3 compliance.
Supply support for TDA8024AT/C1,112 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
NXP Semiconductors is a global semiconductor leader specializing in secure connectivity solutions for automotive, industrial, and identification markets, with deep expertise in smart card and secure element technologies.
The TDA8024 product line was designed specifically for cost-efficient, standards-compliant analog smart card interfacing in payment, ID, and telecom applications - integrating power, clock, protection, and control functions into a single SO28 IC.
FAQ
What is the key functional difference between TDA8024AT/C1,112 and TDA8024T/C1?
The TDA8024AT/C1,112 has pin 18 (PORADJ) internally disconnected, disabling external Power-on Reset threshold adjustment. In contrast, TDA8024T/C1 exposes PORADJ for resistor-bridge configuration to double the reset pulse width from 8 ms to 16 ms. All other electrical, timing, and pinout characteristics - including VCC regulation, clock division, and I/O protection - are identical between TDA8024AT/C1,112 and TDA8024T/C1. This makes TDA8024AT/C1,112 ideal for designs where fixed-reset behavior suffices and board space for external resistors is constrained.
Does TDA8024AT/C1,112 support both 3 V and 5 V smart cards in the same design?
Yes, TDA8024AT/C1,112 supports both 3 V and 5 V smart cards dynamically via the 5V/3V input pin (pin 3). When driven HIGH, it configures the internal DC-to-DC converter to deliver 5.0 V ±5% to VCC; when driven LOW, it delivers 3.0 V ±5%. The IC automatically adapts current limits (80 mA max for 5 V, 65 mA for 3 V) and overload detection thresholds accordingly. This allows a single hardware design to interoperate with legacy 5 V cards and modern 3 V cards without manual jumpering or firmware changes - a critical capability for multi-region payment terminals using TDA8024AT/C1,112.
How does the TDA8024AT/C1,112 handle card removal during an active session?
The TDA8024AT/C1,112 monitors dual card presence inputs (PRES and PRES) with built-in 8 ms typical hardware debounce. On detection of a true card-removal transition (e.g., PRES going from active to inactive), it initiates an emergency deactivation sequence within microseconds: RST is pulled LOW, CLK is held LOW, I/O lines are forced LOW, and VCC is ramped down to zero. Simultaneously, the OFF pin goes LOW to alert the host MCU. This sequence ensures no partial commands or corrupted ATR responses occur, protecting both card EEPROM integrity and host state consistency - a mandatory behavior for PCI PTS and EMV certification when using TDA8024AT/C1,112.
What clock sources does TDA8024AT/C1,112 accept, and what frequencies are supported?
TDA8024AT/C1,112 accepts either a 26 MHz crystal connected between XTAL1 (pin 24) and XTAL2 (pin 25), or an external CMOS clock signal applied to XTAL1 alone (with XTAL2 left open). The internal oscillator starts automatically on power-up. Clock division ratios of ÷1, ÷2, ÷4, or ÷8 are selected via CLKDIV1 (pin 1) and CLKDIV2 (pin 2), producing card clock outputs (CLK pin 15) from 3.25 MHz up to 26 MHz. All division modes guarantee 45–55% duty cycle and synchronous transitions - ensuring reliable communication with ISO 7816-3 cards up to 20 MHz, as required by TDA8024AT/C1,112's specification.
Is TDA8024AT/C1,112 pin-compatible with the older TDA8004AT?
Yes, TDA8024AT/C1,112 is explicitly documented as a direct replacement for TDA8004AT in SO28 packaging, with identical pinout, electrical characteristics, and functional behavior. Both devices share the same SOT136-1 package, 28-pin layout, VCC regulation specs, I/O protection schemes, and activation/deactivation timing. No PCB layout changes, firmware modifications, or external component adjustments are required when upgrading from TDA8004AT to TDA8024AT/C1,112 - making it a seamless drop-in migration path for existing smart card reader designs relying on TDA8004AT.
TDA8024AT/C1,112 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Applications:
- -
- Interface:
- -
- Voltage - Supply:
- -
- Supplier Device Package:
- -
- Grade:
- -
- Qualification:
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- Mounting Type:
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TDA8024AT/C1,112 FAQ
1.How can I place an order for TDA8024AT/C1,112 through Aetrix?
Please submit a Request for Quotation (RFQ) for TDA8024AT/C1,112 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for TDA8024AT/C1,112 reliable?
The price and inventory of TDA8024AT/C1,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TDA8024AT/C1,112 is usually 5 days.
3.What payment methods are accepted for TDA8024AT/C1,112?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TDA8024AT/C1,112 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TDA8024AT/C1,112?
TDA8024AT/C1,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TDA8024AT/C1,112 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for TDA8024AT/C1,112?
For technical support, including TDA8024AT/C1,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TDA8024AT/C1,112 requirements.
6.How does Aetrix verify that TDA8024AT/C1,112 is sourced from the original manufacturer or authorized distributors?
All TDA8024AT/C1,112 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that TDA8024AT/C1,112 meets industry standards.
7.What is the process for return or replacement of TDA8024AT/C1,112?
All TDA8024AT/C1,112 units undergo pre-shipment inspection (PSI). If there is an issue with TDA8024AT/C1,112, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The TDA8024AT/C1,112 part is unused and in its original packaging.
Return procedure for TDA8024AT/C1,112:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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