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Home > Products > Integrated Circuits (ICs) > Interface > Specialized

NXP Semiconductors TDA8024T/C1,518

Name: TDA8024T/C1,518
Brand: NXP Semiconductors
SKU: TDA8024T/C1,518
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TDA8024T/C1,518

Manufacturer:: NXP Semiconductors

Category:: Specialized

Package:: 28-SOIC (0.295", 7.50mm Width)

Datasheet:: TDA8024T/C1,518.pdf

Description:: IC INTERFACE SPECIALIZED 28SO

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Product details

Overview

TDA8024T/C1,518 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 executes automatic activation/deactivation sequences - enabling secure banking card readers and EMV payment terminals with minimal external components.

For engineers reviewing the TDA8024T/C1,518 datasheet, TDA8024T/C1,518 pinout, TDA8024T/C1,518 application, or TDA8024T/C1,518 equivalent, this device is selected for its integrated DC-DC converter (VDDP → VCC), synchronous clock division (÷1/2/4/8), thermal/short-circuit protection on all card contacts, and ISO 7816/GSM11.11/EMV compliance - critical for tamper-resistant financial transaction hardware.

Technical Context

The TDA8024T/C1,518 implements a dual-mode DC-DC converter that operates as either a voltage follower or doubler depending on VDDP and selected VCC (3 V or 5 V), with hysteresis-based threshold switching. Its clock circuitry accepts up to 26 MHz crystal input (XTAL1/XTAL2) or external clock, then generates synchronous, glitch-free CLK outputs at fXTAL, fXTAL/2, fXTAL/4, or fXTAL/8 via CLKDIV1/CLKDIV2 control.

Three identical half-duplex transceivers (I/O, AUX1, AUX2) feature active pull-up (11 kΩ to VCC), 15 mA current limiting, and anti-latch arbitration to prevent bus contention. Fault handling includes built-in debounce (8 ms typ.) on PRES/PRES inputs, automatic emergency deactivation on card removal or short-circuit, and NMOS OFF interrupt output (active LOW) with 20 kΩ internal pull-up to VDD.

Key Specifications

Parameter	Value and Actual Design Meaning
VDD Supply Range	2.7 V to 6.5 V - powers internal logic and host-side I/OUC/AUXxUC lines; must supply host MCU if shared rail
VCC Output Accuracy	±5% at 3 V or 5 V - regulated card supply with ripple ≤350 mV_p-p (20 kHz–200 MHz); supports EMV timing margins
Card Supply Current	≤80 mA @ 5 V / ≤65 mA @ 3 V - continuous delivery with filtered overload detection at ~120 mA
CLK Frequency Options	fXTAL, fXTAL/2, fXTAL/4, fXTAL/8 - synchronous division with no pulse shortening; min. 10 ns delay between CLKDIV changes
ESD Protection	>6 kV HBM on card contacts (I/O, RST, CLK, AUX1, AUX2, PRES) - exceeds ISO 7816-3 mechanical robustness requirements
Thermal Shutdown	Active at T_j ≥150 °C - protects against sustained overloads without external sensing circuitry
Package	SO28 (SOT136-1), 7.5 mm body width - standard surface-mount footprint compatible with automated assembly

Pinout & Package

Package: SO28 plastic small outline package (SOT136-1), 28-pin, 7.5 mm body width, 1.27 mm pitch.

Pin/Terminal	Circuit Role	Design Meaning
1 CLKDIV1	Input	MSB of 2-bit clock divider control; sets fCLK = fXTAL/1, /2, /4, or /8 in combination with CLKDIV2
3 5V/3V	Input	Selects regulated VCC output: HIGH = 5 V, LOW = 3 V - configures DC-DC converter mode and voltage thresholds
6 VDDP	Supply	DC-DC converter input rail (4.0–6.5 V); powers VCC generation independently from VDD
9,10 PRES / PRES	Input	Redundant card presence detection (active LOW/HIGH); includes 8 ms typ. hardware debounce to suppress switch bounce
11 I/O	I/O	Buffered bidirectional line to card contact C7; 11 kΩ pull-up to VCC; 15 mA current limit; anti-latch arbitration
15 CLK	Output	Card clock output to contact C3; synchronous frequency changes; duty cycle 45–55% guaranteed
16 RST	Output	Reset signal to card contact C2; driven by internal sequencer or mirrored from RSTIN after t5 in activation
17 VCC	Supply	Regulated 3 V or 5 V output to card contact C1; requires dual 100 nF decoupling (ESR < 100 mΩ) to CGND
20 RSTIN	Input	Host-driven reset input; non-inverted control - enables precise ATR timing by gating CLK start relative to RST assertion
23 OFF	Output	NMOS open-drain interrupt (active LOW); signals card presence (CMDVCC=HIGH) or fault (CMDVCC=LOW)
24 XTAL1	Input	Crystal or external clock input (up to 26 MHz); starts oscillator at power-up; referenced to VDD
26 I/OUC	I/O	Host-side data line; 11 kΩ pull-up to VDD; level-shifts between VDD and VCC domains; same transceiver architecture as I/O

Key Features

Feature	Design Value
Integrated DC-DC Converter	Generates stable 3 V or 5 V VCC from separate VDDP supply (4–6.5 V); auto-selects follower/doubler mode based on VDDP/VCC combination
Synchronous Clock Division	Four selectable CLK frequencies (÷1/2/4/8) with glitch-free transitions; ensures ISO 7816 timing compliance during dynamic rate changes
Triple Protected I/O Transceivers	Three independent half-duplex buffers (I/O, AUX1, AUX2) with 15 mA current limiting, thermal shutdown, and ESD-hardened interfaces to card contacts C4/C7/C8
Automatic Sequencing Logic	Fully hardware-managed activation/deactivation - including controlled VCC ramp (t2 ≈ 25 μs), CLK enable (t4), and RST assertion (t5) - eliminates firmware timing dependencies
Smart Fault Response	Detects card removal, short-circuit, VDD dropout, or overheating; triggers immediate emergency deactivation and asserts OFF to alert host MCU

Applications

Banking Card Reader	EMV Payment Terminal
Use Scenario: Contact-based debit/credit card insertion in point-of-sale (POS) hardware with PCI PTS v6.0 compliance requirements. IC Role / Device Role / Timing Role: Smart card interface controller managing VCC supply, CLK timing, RST sequencing, and I/O signal translation per ISO 7816-3 physical layer. Use Value: Enables single-chip compliance with EMV Level 1 electrical specifications, including 3 V/5 V dual-voltage support, 20 MHz max CLK, and >6 kV contact ESD immunity.	Use Scenario: Secure payment processing in unattended kiosks where card session reliability and fault recovery are critical. IC Role / Device Role / Timing Role: Analog front-end providing autonomous activation/deactivation, card presence debouncing, and overload detection to prevent transaction corruption. Use Value: Eliminates need for external supervisor or reset IC; OFF pin delivers real-time fault status (card removal, short, thermal) to host without polling.
Secure ID Authentication	Pay-TV Conditional Access
Use Scenario: Government-issued eID cards used in border control systems requiring FIPS 201 PIV or ICAO 9303 biometric document validation. IC Role / Device Role / Timing Role: Interface bridge translating host MCU commands to card protocol stack while enforcing strict voltage, timing, and ESD limits per ISO/IEC 7816-3 Annex A. Use Value: Integrated 26 MHz oscillator and programmable CLK division meet PIV timing jitter requirements (<100 ps RMS) for cryptographic key exchange.	Use Scenario: Set-top box integration where smart card handles conditional access decryption for premium video content. IC Role / Device Role / Timing Role: Power and signal conditioner ensuring stable VCC delivery during high-current decryption bursts and preventing card lock-up due to transient spikes. Use Value: Handles 40 nAs current pulses up to 20 MHz without triggering false overload shutdown - maintains uninterrupted stream decryption.

Banking Card Reader

EMV Payment Terminal

Use Scenario: Contact-based debit/credit card insertion in point-of-sale (POS) hardware with PCI PTS v6.0 compliance requirements.

IC Role / Device Role / Timing Role: Smart card interface controller managing VCC supply, CLK timing, RST sequencing, and I/O signal translation per ISO 7816-3 physical layer.

Use Value: Enables single-chip compliance with EMV Level 1 electrical specifications, including 3 V/5 V dual-voltage support, 20 MHz max CLK, and >6 kV contact ESD immunity.

Use Scenario: Secure payment processing in unattended kiosks where card session reliability and fault recovery are critical.

IC Role / Device Role / Timing Role: Analog front-end providing autonomous activation/deactivation, card presence debouncing, and overload detection to prevent transaction corruption.

Use Value: Eliminates need for external supervisor or reset IC; OFF pin delivers real-time fault status (card removal, short, thermal) to host without polling.

Secure ID Authentication

Pay-TV Conditional Access

Use Scenario: Government-issued eID cards used in border control systems requiring FIPS 201 PIV or ICAO 9303 biometric document validation.

IC Role / Device Role / Timing Role: Interface bridge translating host MCU commands to card protocol stack while enforcing strict voltage, timing, and ESD limits per ISO/IEC 7816-3 Annex A.

Use Value: Integrated 26 MHz oscillator and programmable CLK division meet PIV timing jitter requirements (<100 ps RMS) for cryptographic key exchange.

Use Scenario: Set-top box integration where smart card handles conditional access decryption for premium video content.

IC Role / Device Role / Timing Role: Power and signal conditioner ensuring stable VCC delivery during high-current decryption bursts and preventing card lock-up due to transient spikes.

Use Value: Handles 40 nAs current pulses up to 20 MHz without triggering false overload shutdown - maintains uninterrupted stream decryption.

Equivalent & Alternatives

The following parts are listed as comparable options for similar smart card interface applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
TDA8024AT/C1	No PORADJ pin connection; fixed internal power-on reset threshold (~8 ms pulse); lacks external resistor bridge option for adjustable VDD dropout detection	Suitable for cost-sensitive designs where supply supervision flexibility is not required; identical pinout and core functionality	Select TDA8024AT/C1 when external POR threshold tuning is unnecessary and BOM simplification is prioritized
TDA8024TT/C1	TSSOP28 package (SOT361-1), 4.4 mm body width; same electrical specs but reduced PCB footprint and thermal resistance (100 K/W vs. 70 K/W)	Better suited for space-constrained portable readers; requires requalification of thermal layout due to higher junction-to-ambient resistance	Choose TDA8024TT/C1 for handheld or embedded designs needing smaller form factor, accepting tighter thermal design margin

Compared with TDA8024AT/C1, the TDA8024T/C1,518 offers field-adjustable power-on reset via PORADJ, enabling custom VDD dropout thresholds for diverse host MCU supply tolerances; versus TDA8024TT/C1, it provides lower thermal resistance in SO28 packaging for higher ambient temperature operation without derating.

Availability

TDA8024T/C1,518 is available at Aetrix Electronics and suitable for banking card readers, EMV payment terminals, and secure ID authentication systems requiring stable component supply, long-term lifecycle support, and traceable sourcing for certified hardware deployments.

Supply support for TDA8024T/C1,518 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 NFC interface technologies.

The TDA8024 series belongs to NXP's dedicated smart card analog interface product line, engineered specifically to simplify ISO 7816-3 compliant hardware design for financial, government, and pay-TV applications - reducing external component count and firmware complexity.

FAQ

What is the primary function of the TDA8024T/C1,518 in a smart card system?

The TDA8024T/C1,518 serves as a complete analog interface between a host microcontroller and ISO 7816-compliant smart cards. It generates and regulates the card's VCC supply (3 V or 5 V), provides buffered bidirectional I/O lines (C4/C7/C8), delivers synchronized clock (CLK) and reset (RST) signals, and manages full activation/deactivation sequences - eliminating the need for discrete regulators, level shifters, and protection circuitry in the TDA8024T/C1,518 design.

How does the TDA8024T/C1,518 handle card presence detection and debounce?

The TDA8024T/C1,518 features dual card presence inputs (PRES and PRES) supporting both normally-open and normally-closed mechanical switches. It incorporates an internal 8 ms typical hardware debounce circuit that filters switch bounce during card insertion or removal. When a valid edge is detected on either input, the device initiates automatic activation or emergency deactivation - and asserts or clears the OFF pin accordingly - without requiring host MCU intervention in the TDA8024T/C1,518 implementation.

Can the TDA8024T/C1,518 support both 3 V and 5 V smart cards in the same design?

Yes, the TDA8024T/C1,518 supports dual-voltage operation via the 5V/3V pin (Pin 3): driving it HIGH selects 5 V VCC output (4.75–5.25 V), while driving it LOW selects 3 V VCC (2.85–3.15 V). The DC-DC converter automatically adapts its topology (voltage follower or doubler) based on VDDP and the selected VCC, and all protection, timing, and current-limiting functions remain fully specified across both modes in the TDA8024T/C1,518 datasheet.

What clock sources and frequencies does the TDA8024T/C1,518 accept?

The TDA8024T/C1,518 accepts either a 26 MHz crystal connected between XTAL1 and XTAL2, or an external clock signal applied to XTAL1. It then generates the card clock (CLK) at fXTAL, fXTAL/2, fXTAL/4, or fXTAL/8 using the CLKDIV1 and CLKDIV2 inputs. All frequency transitions are synchronous and glitch-free, with minimum pulse width guarantees - meeting ISO 7816-3 timing requirements up to 20 MHz in the TDA8024T/C1,518 configuration.

How does the OFF pin function in normal and fault conditions?

The OFF pin is an NMOS open-drain output (20 kΩ internal pull-up to VDD) that indicates card presence when CMDVCC is HIGH (OFF = HIGH = card present), and signals faults when CMDVCC is LOW (OFF = LOW = card removal, short-circuit, VDD dropout, or overheating). After emergency deactivation, OFF remains LOW until CMDVCC is returned HIGH and the device completes its reset sequence - enabling reliable fault diagnosis in the TDA8024T/C1,518 system.

TDA8024T/C1,518 Specifications

Product attributes: Attribute value

Manufacturer:: NXP Semiconductors

Series:: -

Package/Case:: 28-SOIC (0.295", 7.50mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Applications:: -

Interface:: Analog

Voltage - Supply:: 2.7V ~ 6.5V

Supplier Device Package:: 28-SO

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

TDA8024T/C1,518 FAQ

1.How can I place an order for TDA8024T/C1,518 through Aetrix?

Please submit a Request for Quotation (RFQ) for TDA8024T/C1,518 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 TDA8024T/C1,518 reliable?

The price and inventory of TDA8024T/C1,518 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TDA8024T/C1,518 is usually 5 days.

3.What payment methods are accepted for TDA8024T/C1,518?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TDA8024T/C1,518 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TDA8024T/C1,518?

TDA8024T/C1,518 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TDA8024T/C1,518 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 TDA8024T/C1,518?

For technical support, including TDA8024T/C1,518 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TDA8024T/C1,518 requirements.

6.How does Aetrix verify that TDA8024T/C1,518 is sourced from the original manufacturer or authorized distributors?

All TDA8024T/C1,518 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 TDA8024T/C1,518 meets industry standards.

7.What is the process for return or replacement of TDA8024T/C1,518?

All TDA8024T/C1,518 units undergo pre-shipment inspection (PSI). If there is an issue with TDA8024T/C1,518, 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 TDA8024T/C1,518 part is unused and in its original packaging.

Return procedure for TDA8024T/C1,518:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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