NXP Semiconductors TDA8004T/C1,118

Overview

TDA8004T/C1,118 from NXP Semiconductors (formerly Philips) is a complete analog interface IC for ISO 7816-compliant asynchronous smart cards, positioned between card and microcontroller to manage supply, reset, clock, and I/O protection with minimal external components. It delivers regulated 5 V ±5 % VCC to the card, supports up to 20 MHz card clock via programmable division (1×/2×/4×/8×), and integrates thermal/short-circuit protection on all card contacts for banking-grade secure transaction systems.

For engineers reviewing the TDA8004T/C1,118 datasheet, TDA8004T/C1,118 pinout, TDA8004T/C1,118 application, or TDA8004T/C1,118 equivalent, this page provides verified functional specifications, SO28 package layout, ISO 7816/GSM11.11/EMV compliance details, and real-world design constraints including VCC ripple limits (≤350 mV p-p), 65 mA continuous card supply current, and 200 ns edge-synchronized I/O transceiver timing.

Technical Context

The TDA8004T/C1,118 implements an integrated 26 MHz crystal oscillator with programmable clock divider (CLKDIV1/CLKDIV2) to generate precise 0–20 MHz card clocks meeting EMV timing requirements. Its step-up converter (VDDP-powered) generates VCC with controlled slew rate (0.09–0.27 V/µs) and filtered overload detection (~90 mA), enabling safe hot-plug operation in payment terminals.

All three protected bidirectional I/O lines (I/O, AUX1, AUX2) feature active pull-up circuitry delivering >1 mA at 0.9VCC into 80 pF loads, synchronized via anti-latch logic with 200 ns edge delay-ensuring reliable half-duplex communication per ISO 7816-3 while preventing bus contention during card insertion/removal.

Key Specifications

Pinout & Package

Package: SO28 plastic small outline package (SOT136-1), 28-pin, 7.5 mm body width, standard JEDEC MS-012AC footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TDA8004T/C1,118, SLB9670 serves entirely different security-layer functions and cannot replace its analog interface role, while ST8024 shifts power management and timing control to external components-increasing BOM cost and reducing compliance assurance for ISO 7816-3.

Availability

TDA8004T/C1,118 is available at Aetrix Electronics and suitable for banking card readers, EMV payment terminals, and ID authentication systems requiring stable component supply, long-term lifecycle support, and certified ISO 7816 compliance.

Supply support for TDA8004T/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, formerly Philips Semiconductors, designs secure interface and identification solutions for financial, government, and consumer applications.

The TDA8004T/C1,118 belongs to NXP's smart card analog interface product line, engineered specifically to simplify ISO 7816-3 compliant reader design by integrating VCC regulation, clock generation, and contact protection in a single SO28 package.

FAQ

What is the maximum card supply current supported by the TDA8004T/C1,118?

The TDA8004T/C1,118 delivers up to 65 mA continuously to the smart card via its VCC output. It incorporates filtered overload detection at approximately 90 mA, allowing transient current pulses up to 200 mA (duration < 400 ns) without triggering deactivation-critical for handling card startup surges while maintaining EMV compliance.

How does the TDA8004T/C1,118 handle card presence detection?

The TDA8004T/C1,118 uses dual redundant inputs (PRES active-LOW and PRES active-HIGH) to detect card insertion or removal. The first valid transition on either pin initiates automatic deactivation, and software must implement debouncing externally since no internal debounce circuitry exists-ensuring rapid fault response while accommodating mechanical switch bounce.

Can the TDA8004T/C1,118 operate with a 3.3 V microcontroller supply?

Yes-the TDA8004T/C1,118 accepts VDD from 2.7 V to 6.5 V, making it fully compatible with 3.3 V microcontrollers. All system-side I/O (CMDVCC, RSTIN, CLKDIV1/2, etc.) reference VDD, and internal pull-ups on I/OUC/AUX1UC/AUX2UC connect to VDD, eliminating level-shifting requirements in mixed-voltage designs.

What crystal or clock source options does the TDA8004T/C1,118 support?

The TDA8004T/C1,118 supports both integrated and external clock sources: a 2–26 MHz crystal connected across XTAL1/XTAL2, or an external clock signal applied to XTAL1. The internal 26 MHz oscillator eliminates external components, while the programmable CLKDIV1/CLKDIV2 pins allow synchronous division to generate precise 0–20 MHz card clocks per EMV requirements.

Does the TDA8004T/C1,118 provide ESD protection on card-contact pins?

Yes-the TDA8004T/C1,118 provides >6 kV HBM ESD protection on all card-contact pins (I/O, RST, CLK, AUX1, AUX2, PRES), exceeding ISO 7816-3 requirements. System-side pins (e.g., CMDVCC, RSTIN) feature 2 kV protection, ensuring robustness against handling damage in field-deployed readers.