NXP Semiconductors TDA8035HN/C1/S1J

Overview

TDA8035HN/C1/S1J 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/S1J datasheet, TDA8035HN/C1/S1J pinout, TDA8035HN/C1/S1J application, or TDA8035HN/C1/S1J equivalent, key selection considerations include its HVQFN32 package, triple-voltage VCC regulation with 125 mA overload detection, synchronous CLKDIV-based clock scaling (fXTAL/2–fXTAL/8), built-in card presence debouncing (4.05 ms), and ESD protection >8 kV on card-side pins.

Technical Context

The TDA8035HN/C1/S1J 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-triggered activation/deactivation sequences with controlled VCC ramp rates and automatic fault response.

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 independent voltage domain operation. Clock sourcing is auto-detected between external XTAL1 input or crystal oscillator (XTAL1/XTAL2), with synchronous frequency division via CLKDIV1/CLKDIV2 pins.

Key Specifications

Pinout & Package

HVQFN32 package: plastic thermal-enhanced very thin quad flat package, no leads, 32 terminals, body size 5 × 5 × 0.85 mm (SOT617-7).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TDA8035HN/C2/S1J, the TDA8035HN/C1/S1J omits EMV 4.3 certification but retains identical electrical performance and packaging - making it ideal for non-payment applications where cost and certification overhead matter. Versus TDA8024HN/C1/S1J, it adds 1.8 V support, cuts deep shutdown current by 10×, and integrates stronger ESD protection.

Availability

TDA8035HN/C1/S1J is available at Aetrix Electronics and suitable for Pay TV conditional access modules, EMV banking terminals, and government eID readers requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for TDA8035HN/C1/S1J 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.

The TDA8035 belongs to NXP's smart card reader IC product line, engineered specifically for low-power, high-security ISO 7816 contact interfaces in payment, identity, and conditional access systems.

FAQ

What is the primary function of the TDA8035HN/C1/S1J in a smart card system?

The TDA8035HN/C1/S1J serves as a fully integrated ISO 7816-3 compliant smart card interface IC. It generates regulated VCC (5 V/3 V/1.8 V), supplies precise clock and reset signals to the card, manages bidirectional I/O communication, and performs real-time fault monitoring including short-circuit detection, thermal protection, and ESD hardening - all within a single HVQFN32 package.

Does the TDA8035HN/C1/S1J support 1.8 V smart cards, and how is voltage selection controlled?

Yes, the TDA8035HN/C1/S1J supports 1.8 V smart cards. Voltage selection is controlled via two dedicated logic inputs: EN_1.8VN (active LOW to select 1.8 V) and EN_5V/3VN (HIGH = 5 V, LOW = 3 V). When EN_1.8VN is LOW, VCC is regulated to 1.8 V ±5 % regardless of EN_5V/3VN state - enabling seamless interoperability across all three ISO 7816 voltage classes.

How does the TDA8035HN/C1/S1J handle card removal during an active session?

Upon detecting card removal via the PRESN pin, the TDA8035HN/C1/S1J initiates an emergency deactivation sequence: RST goes LOW, CLK stops, I/O/AUX lines are pulled LOW, and VCC ramps down to zero within ≤250 µs. The OFFN pin asserts LOW to alert the host, and the device enters shutdown mode - preventing data corruption and protecting card contacts from uncontrolled voltage transients.

What is the significance of the 4.05 ms debounce time on the PRESN pin of the TDA8035HN/C1/S1J?

The 4.05 ms hardware debounce on the PRESN pin eliminates mechanical switch bounce during card insertion or extraction. This ensures reliable card presence detection without requiring external RC filters or firmware polling delays. It directly enables robust operation in high-usage environments like public transport validators or self-service kiosks where rapid card cycling occurs.

Can the TDA8035HN/C1/S1J operate with an external clock source instead of a crystal oscillator?

Yes, the TDA8035HN/C1/S1J supports both external clock input (applied to XTAL1) and crystal oscillator (XTAL1/XTAL2). It automatically detects the presence of an external clock on power-up or activation and disables the crystal oscillator accordingly - eliminating the need for configuration pins or firmware setup. This simplifies board design and improves clock source flexibility.