NXP Semiconductors TDA8035HN/C1,118

Overview

TDA8035HN/C1,118 from NXP Semiconductors is a highly integrated, low-power smart card interface IC designed for ISO 7816-compliant contact readers. It delivers regulated 5 V / 3 V / 1.8 V card supply (VCC), supports up to 20 MHz card clock generation, provides thermal/short-circuit protection on all card contacts, and achieves ≤0.1 µA deep shutdown current - enabling power-efficient banking and pay-TV terminals.

For engineers reviewing the TDA8035HN/C1,118 datasheet, TDA8035HN/C1,118 pinout, TDA8035HN/C1,118 application, or TDA8035HN/C1,118 equivalent, key selection criteria include its HVQFN32 package, triple-voltage VCC regulation with 125 mA overload detection, synchronous CLKDIV-based clock scaling, built-in card presence debouncing (4.05 ms), and EMV 4.3 compliance in C2 variant.

Technical Context

The TDA8035HN/C1,118 integrates a DC-to-DC converter powered by VDDP (2.7–5.5 V) to generate precise VCC outputs (5 V ±5 %, 3 V ±5 %, 1.8 V ±5 %) using external 220 nF multilayer ceramic capacitors. Its digital sequencer executes hardware- or software-initiated activation/deactivation sequences with controlled VCC ramping and automatic emergency shutdown on short-circuit, card removal, or supply drop.

It features three protected half-duplex bidirectional I/O lines (I/O, AUX1, AUX2) referenced to VCC and host-side buffered lines (I/OUC, AUX1UC, AUX2UC) referenced to VDD(INTF), enabling level-shifted communication. Clock sourcing is auto-detected between external XTAL1 input or crystal oscillator (XTAL1/XTAL2), with synchronous frequency division (fXTAL, fXTAL/2, fXTAL/4, fXTAL/8) via CLKDIV1/CLKDIV2 pins.

Key Specifications

Pinout & Package

HVQFN32 package: plastic thermal-enhanced very thin quad flat no-lead, 5 mm × 5 mm × 0.85 mm body, 32 terminals, SOT617-7 footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SLB9670TT2.0 and TDA8024HN/C1,118, the TDA8035HN/C1,118 uniquely combines triple-voltage VCC regulation, 0.1 µA deep shutdown, and synchronous clock scaling - making it the only option for new EMV 4.3 or eID-compliant designs requiring full voltage class coverage and ultra-low standby power.

Availability

TDA8035HN/C1,118 is available at Aetrix Electronics and suitable for banking card readers, pay-TV conditional access modules, and government ID terminals requiring stable component supply, long-term lifecycle support, and ISO 7816-3 compliance.

Supply support for TDA8035HN/C1,118 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 IoT applications, with core expertise in smart card, NFC, and trusted execution technologies.

The TDA8035HN/C1,118 belongs to NXP's contact smart card reader IC product line, engineered specifically for high-security, low-power, multi-voltage ISO 7816 interfaces in payment, identification, and conditional access systems.

FAQ

What is the maximum clock frequency supported by the TDA8035HN/C1,118 for smart card communication?

The TDA8035HN/C1,118 supports a maximum card clock frequency of 20 MHz when configured with fXTAL/1 division via CLKDIV1 and CLKDIV2 pins. This meets the timing requirements of high-speed EMV and eID protocols. The clock source can be either an external signal applied to XTAL1 or a crystal oscillator connected across XTAL1/XTAL2, with automatic detection on each CMDVCCN activation edge. Duty cycle remains tightly controlled between 45 % and 55 % across all divisions.

How does the TDA8035HN/C1,118 handle different smart card voltage classes (5 V, 3 V, 1.8 V)?

The TDA8035HN/C1,118 uses EN_5V/3VN and EN_1.8VN control pins to select VCC output voltage: EN_5V/3VN = HIGH selects 5 V, LOW selects 3 V (when EN_1.8VN = HIGH); EN_1.8VN = LOW selects 1.8 V. All three outputs meet ±5 % tolerance using 220 nF MLCCs and provide continuous current up to 65 mA (5 V/3 V) or 35 mA (1.8 V). Overload detection is internally filtered at ~125 mA to tolerate transient spikes without false deactivation.

What protection features does the TDA8035HN/C1,118 provide for smart card contacts?

The TDA8035HN/C1,118 provides thermal and short-circuit protection on all card contacts (VCC, RST, CLK, I/O, AUX1, AUX2, PRESN), >8 kV HBM ESD protection on card-side pins, and supply supervision for VDDP, VREG, and VDD(INTF). Fault detection triggers automatic emergency deactivation and asserts OFFN (active-Low interrupt) to the host. The device also includes built-in 4.05 ms hardware debouncing on PRESN to eliminate mechanical switch bounce during card insertion or removal.

What is the lowest power consumption state of the TDA8035HN/C1,118, and how is it entered?

The lowest power state is Deep Shutdown mode, consuming ≤0.1 µA at VDDP = 3.3 V. It is entered by holding CMDVCCN = HIGH while setting both EN_5V/3VN and EN_1.8VN = LOW - a condition only valid when the smart card reader is inactive. In this mode, all circuits are disabled except the PRESN sense path, and OFFN mirrors PRESN status. Exit is triggered by changing any of the three control pins, initiating a full activation sequence.

Is the TDA8035HN/C1,118 pin-compatible with earlier NXP smart card reader ICs?

Yes, the TDA8035HN/C1,118 is software-compatible with TDA8024 and TDA8034, and shares the same HVQFN32 (SOT617-7) package and pinout. This allows direct PCB replacement in existing designs while adding support for 1.8 V cards, deeper shutdown, enhanced ESD, and improved clock flexibility. No layout changes or firmware modifications are required beyond enabling new features via updated configuration registers.