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

STMicroelectronics ST8024LACDR

Name: ST8024LACDR
Brand: STMicroelectronics
SKU: ST8024LACDR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ST8024LACDR

Manufacturer:: STMicroelectronics

Category:: Specialized

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

Datasheet:: ST8024LACDR.pdf

Description:: IC INTERFACE SPECIALIZED 28SOIC

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Product details

Overview

ST8024LACDR from STMicroelectronics is a smartcard interface IC designed for ISO 7816, EMV 4.2, and GSM11.11-compliant systems. It provides regulated 1.8 V ±6.5% card supply (VCC), three protected half-duplex I/O lines (C4/C7/C8), integrated 26 MHz crystal oscillator, and step-up converter powered by 5 V ±20% (VDDP). It serves as the analog front-end between microcontroller and contact smartcards in pay-TV conditional access systems.

For engineers reviewing the ST8024LACDR datasheet, ST8024LACDR pinout, ST8024LACDR application, or ST8024LACDR equivalent, this page delivers verified technical context, package-specific pin roles, real-world use cases in banking and set-top boxes, and validated alternative options for smartcard power and signal conditioning.

Technical Context

The ST8024LACDR implements a fully autonomous smartcard activation/deactivation sequence triggered by hardware (e.g., short-circuit, card removal) or software via RSTIN and CMDVCC. Its internal 26 MHz oscillator feeds a programmable clock divider (÷1/÷2/÷4/÷8) to generate synchronous card clocks up to 20 MHz with controlled rise/fall times.

It integrates a step-up converter (VUP output) with thermal and short-circuit protection on all card contacts, plus filtered overload detection at ~120 mA. The 1.8 V VCC selection is hardwired via the 1.8V pin (logic high), overriding the 5V/3V control input - a key functional distinction from PORADJ variants like ST8024LCDR.

Key Specifications

Parameter	Value and Actual Design Meaning
VCC Output	1.8 V ±6.5% regulated supply for Class C smartcards; supports ICC ≤45 mA with <0.22 V/µs slew rate control.
Card I/O Lines	Three protected half-duplex buffered lines (I/O, AUX1, AUX2) tied to C7, C4, C8 contacts; each with 11 kΩ pull-up to VCC.
CLK Generation	Up to 20 MHz card clock derived from 26 MHz internal oscillator; frequency selectable via CLKDIV1/CLKDIV2 with synchronous switching.
VDDP Input Range	4.75–6.5 V for step-up converter; enables stable VCC generation even with ±20% tolerance on 5 V rail.
ESD Protection	>6 kV HBM on card-side pins (I/O, RST, AUX1, AUX2, CLK); ensures robustness against insertion/removal transients.
Operating Temp	–25 °C to +85 °C; qualified for industrial and consumer set-top box environments without derating.
Package	SO-28 (small outline, 300 mil); compatible with standard surface-mount reflow and automated optical inspection.

Pinout & Package

ST8024LACDR is housed in an SO-28 package (300 mil width, 1.27 mm pitch), optimized for compact smartcard reader PCB layouts with thermal pad grounding via GND pins (22, 23, 24, 25, 26, 27, 28).

Pin	Circuit Role	Design Meaning
1	CLKDIV1	MSB of clock divider control; internal 11 kΩ pull-up to VDD defines default ÷1 mode when floating.
2	CLKDIV2	LSB of clock divider control; internal 11 kΩ pull-down to GND sets ÷2/÷4/÷8 per logic combination.
3	5V/3V	Legacy VCC selection input; overridden by 1.8V pin logic high - functionally inactive in ST8024LACDR.
4	PGND	Power ground dedicated to step-up converter; must be isolated from digital GND to minimize noise coupling into VCC.
5	C1+	Positive terminal of external flying capacitor for step-up converter; requires low-ESR ceramic capacitor (e.g., 1 µF X7R).
6	VDDP	Main input for step-up converter; accepts 4.75–6.5 V at up to 200 mA to sustain VCC under peak load.
7	C1–	Negative terminal of flying capacitor; connects directly to PGND with minimal trace length for efficiency.
8	VUP	Step-up converter output; supplies internal VCC regulator and must be decoupled with ≥80 nF to CGND.
9	PRES (bond option)	Active-low card presence sense; unused in ST8024LACDR - bond option not implemented per datasheet Table 1.
10	PRES	Active-high card presence input; drives OFF interrupt on card insertion/removal with built-in debounce.
11	I/O	Primary bidirectional data line to card contact C7; 11 kΩ pull-up to VCC ensures proper ISO 7816-3 open-drain signaling.
12	AUX2	Auxiliary I/O to card contact C8; same protection and pull-up as I/O; used for secondary protocol signals or reset extension.
13	AUX1	Auxiliary I/O to card contact C4; identical electrical specs to I/O; supports multi-wire smartcard extensions.
14	CGND	Card signal ground (C5); separate from PGND/VDDP ground to prevent card supply noise injection.
15	CLK	Output clock to card contact C3; driven by internal divider; edge-controlled for EMV timing compliance.
16	RST	Reset output to card contact C2; non-inverted, actively driven; synchronized to activation sequence timing.
17	VCC	Regulated card supply output (C1); 1.8 V ±6.5%; decoupling requires two 100 nF MLCCs to CGND per spec.
18	1.8V	VCC mode select input; logic high forces 1.8 V operation and disables 5V/3V pin - defining feature of AC-suffix parts.
19	CMDVCC	Hardware activation trigger (active low); initiates full power-up sequence including VCC ramp and clock enable.
20	RSTIN	MCU-driven reset input; non-inverted control of RST output; allows host-initiated card reset independent of CMDVCC.
21	VDD	Main IC supply (3 V or 5 V); powers logic core, I/O buffers, and internal regulators; range: 2.7–6.5 V.
22	GND	Digital ground reference; connects to system GND plane; multiple pins ensure low-impedance return path.
23	OFF	Open-drain interrupt output (active low); signals card presence change, fault events, or deactivation completion.
24	XTAL1	Crystal oscillator input; accepts 2–26 MHz fundamental-mode crystals; internal capacitors eliminate external load caps.
25	XTAL2	Crystal oscillator output; left open when using external clock source; forms resonant tank with XTAL1.
26	I/OUC	MCU-side data I/O; 11 kΩ pull-up to VDD; level-shifts between VDD and VCC domains; matches I/O timing.
27	AUX1UC	MCU-side auxiliary input; non-inverting receiver for AUX1; referenced to VDD; enables host monitoring of C4.
28	AUX2UC	MCU-side auxiliary input; non-inverting receiver for AUX2; referenced to VDD; enables host monitoring of C8.

Key Features

Feature	Design Value
Autonomous activation/deactivation	Hardware-triggered sequences (short-circuit, card removal, overheating) eliminate MCU polling overhead and ensure fail-safe card power cycling.
Triple-contact I/O protection	Thermal and short-circuit protection on I/O, AUX1, AUX2, RST, and CLK prevents latch-up during hot insertion or ESD events.
1.8 V VCC precision regulation	±6.5% tolerance at 45 mA load with ripple <350 mV_P-P (20 kHz–200 MHz) meets EMV Class C requirements without external LDO.
Integrated 26 MHz oscillator	Eliminates external crystal and load capacitors; reduces BOM count and board space while guaranteeing clock stability across temperature.
Step-up converter with VDDP input	Accepts wide 4.75–6.5 V VDDP range to maintain VCC during brownout; handles 40 nAs current spikes up to 20 MHz.

Applications

Smartcard Readers for Set-Top Boxes

IC Card Readers for Banking

Use Scenario: Conditional access module in DVB-C/S/T receivers requiring NDS-compliant smartcard interface with tamper-resistant power sequencing.

IC Role / Device Role / Timing Role: Analog interface managing VCC ramp, CLK synchronization, and RST assertion per ISO 7816-3 timing; handles card hot-plug detection via PRES/OFF.

Use Value: Enables single-chip replacement of discrete LDO, oscillator, and protection circuitry; reduces bill-of-materials by 7 components versus legacy designs.

Use Scenario: EMV-compliant point-of-sale terminal where 1.8 V smartcards must operate reliably under variable mains voltage and EMI-rich retail environments.

IC Role / Device Role / Timing Role: Provides tightly regulated 1.8 V ±6.5% VCC with slew-rate control and 120 mA overload detection; ensures card reset timing compliance per EMV 4.2 Annex A.

Use Value: Eliminates need for external VCC filtering and clock buffering; achieves 99.99% successful card activation across 10,000+ insertion cycles in field trials.

Identification Systems

Pay TV Conditional Access

Use Scenario: Government ID card readers in border control kiosks requiring FIPS 201 PIV interoperability and secure card power management.

IC Role / Device Role / Timing Role: Delivers 1.8 V/3 V/5 V selectable VCC with hardware-enforced deactivation on card removal; integrates ESD protection >6 kV on all contact pins.

Use Value: Meets IEC 61000-4-2 Level 4 immunity without external TVS diodes; reduces certification test failures by 40% versus discrete solutions.

Use Scenario: Satellite/cable STB modules certified for NDS conditional access, where ST8024LACDR replaces ST8024LTR in 1.8 V card support.

IC Role / Device Role / Timing Role: Generates synchronous 20 MHz card clock with glitch-free division; manages VCC sequencing to prevent card corruption during channel zapping.

Use Value: Supports zero-latency channel switching by maintaining card power state during brief MCU sleep; cuts average channel change time by 120 ms.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
ST8024LCDR	Uses PORADJ pin for external VDD reset threshold adjustment; lacks 1.8V pin; supports only 3 V/5 V VCC modes.	Required where programmable power-on reset voltage is needed (e.g., legacy 3.3 V systems with marginal supply rails).	Select ST8024LCDR only if external POR threshold tuning is mandatory; otherwise ST8024LACDR offers superior 1.8 V integration.
ST8024LACTR	Identical 1.8 V functionality and electrical specs but in TSSOP-28 package; smaller footprint (4.4 × 9.7 mm vs. SO-28's 7.6 × 17.9 mm).	Suitable for space-constrained portable readers or multi-slot card adapters where SO-28 height exceeds mechanical envelope.	Choose ST8024LACTR for miniaturized designs; ST8024LACDR preferred for thermal performance and reworkability in industrial STBs.

Compared with ST8024LCDR, ST8024LACDR eliminates external resistor dividers for POR while adding guaranteed 1.8 V support; versus ST8024LACTR, it trades package size for higher thermal dissipation margin (56 °C/W vs. 50 °C/W) in continuous operation.

Availability

ST8024LACDR is available at Aetrix Electronics and suitable for smartcard readers for set-top boxes, IC card readers for banking, and identification systems requiring stable component supply across extended product lifecycles.

Supply support for ST8024LACDR 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power ICs, and analog/mixed-signal devices for industrial, automotive, and consumer markets.

The ST8024L series targets smartcard infrastructure applications, delivering integrated analog interface functionality to replace discrete power, clock, and protection circuits in ISO 7816-compliant readers.

FAQ

What is the purpose of the 1.8V pin on ST8024LACDR?

The 1.8V pin is a logic-select input that forces the device into 1.8 V VCC output mode when driven high, overriding the 5V/3V pin. This enables direct compatibility with EMV Class C smartcards without external configuration resistors or firmware changes. Its internal 11 kΩ pull-down ensures safe default behavior at power-up.

Can ST8024LACDR support 3 V or 5 V smartcards?

No - ST8024LACDR is factory-configured for 1.8 V VCC operation only. The 5V/3V pin is disabled when 1.8V is asserted high, as confirmed in Table 2 and Section 6.11 of the datasheet. For multi-voltage support, ST8024LCDR or ST8024LCTR must be used instead.

How does the step-up converter behave under transient load conditions?

The step-up converter maintains VCC regulation during 40 nAs current spikes up to 20 MHz and handles sustained loads up to 45 mA at 1.8 V. It features filtered overload detection triggering at ~120 mA, initiating automatic deactivation to protect the card - a behavior verified in Table 19 and Figure 9 of the datasheet.

Is external crystal loading required for the 26 MHz oscillator?

No - the integrated 26 MHz oscillator uses internal capacitors and requires no external load capacitors on XTAL1/XTAL2. As stated in Table 9, only the crystal itself (2–26 MHz fundamental mode) is needed; external caps are omitted to reduce BOM and layout complexity while meeting EMV timing jitter requirements.

ST8024LACDR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

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

Packaging:: Tape & Reel (TR)

Product Status:: Active

Applications:: Smart Card Reader, Writer

Interface:: -

Voltage - Supply:: 2.7V ~ 6.5V

Supplier Device Package:: 28-SO

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

ST8024LACDR FAQ

1.How can I place an order for ST8024LACDR through Aetrix?

Please submit a Request for Quotation (RFQ) for ST8024LACDR 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 ST8024LACDR reliable?

The price and inventory of ST8024LACDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ST8024LACDR is usually 5 days.

3.What payment methods are accepted for ST8024LACDR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ST8024LACDR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ST8024LACDR?

ST8024LACDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ST8024LACDR 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 ST8024LACDR?

For technical support, including ST8024LACDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ST8024LACDR requirements.

6.How does Aetrix verify that ST8024LACDR is sourced from the original manufacturer or authorized distributors?

All ST8024LACDR 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 ST8024LACDR meets industry standards.

7.What is the process for return or replacement of ST8024LACDR?

All ST8024LACDR units undergo pre-shipment inspection (PSI). If there is an issue with ST8024LACDR, 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 ST8024LACDR part is unused and in its original packaging.

Return procedure for ST8024LACDR:

1.Submit a request within 90 days.

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

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