NXP Semiconductors TDA8026ET/C2,557

Overview

TDA8026ET/C2,557 from NXP Semiconductors is a cost-effective analog smart card interface IC for Point-of-Sale (POS) terminals, supporting up to two synchronous/asynchronous main cards and four Security Access Modules (SAMs). It operates from 2.7 V to 5.5 V supply, delivers regulated 1.8 V/3 V/5 V card supplies with ±5% accuracy, and integrates thermal/short-circuit protection on all five card slots.

For engineers reviewing the TDA8026ET/C2,557 datasheet, TDA8026ET/C2,557 pinout, TDA8026ET/C2,557 application, or TDA8026ET/C2,557 equivalent, key selection considerations include ISO 7816-3/EMV 4.31 compliance, I²C-bus control (100 kHz/400 kHz), programmable power reduction modes, and TFBGA64 package compatibility with payment terminal security requirements.

Technical Context

The TDA8026ET/C2,557 implements an integrated DC-to-DC converter generating VCC(1)–VCC(5) at 1.8 V/3 V/5 V ±5%, with current limiting (~100 mA per slot) and 40 nAs current spikes up to 20 MHz for 5 V cards. Its dual-clock architecture accepts CLKIN1 (slot 1) and CLKIN2 (slots 2–5), enabling independent clock generation up to 20 MHz with programmable division (1/2/4/5) and low-power clock-stop mode.

It features five protected half-duplex bidirectional I/O lines (±15 mA, 1 MHz max), two auxiliary I²C-controlled I/O lines, and dedicated microcontroller interface supply (VDD(INTF), 1.6–3.6 V). Automatic activation/deactivation sequences respond to short-circuit, card removal, or voltage dropout on VDD(INTF), VDD, or VUP, with 17.8 ms typical debouncing on PRES(1)/PRES(2).

Key Specifications

Pinout & Package

Package: TFBGA64 (SOT1073-1), plastic thin fine-pitch ball grid array with 64 solder balls, optimized for compact, secure POS terminal PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SLB9670 and TDA8035, the TDA8026ET/C2,557 uniquely integrates five-slot analog interface, on-chip DC-to-DC conversion, and EMV 4.31 SAM coordination - making it the only solution that satisfies full POS terminal requirements without supplemental ICs.

Availability

TDA8026ET/C2,557 is available at Aetrix Electronics and suitable for EMV-certified point-of-sale terminals, multi-SAM secure readers, and PCI PTS-compliant banking kiosks requiring stable component supply and long-term lifecycle support.

Supply support for TDA8026ET/C2,557 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 payment technologies.

The TDA8026ET/C2,557 belongs to NXP's secure interface IC product line, designed specifically to meet EMV 4.31 and ISO 7816-3 requirements for high-reliability, multi-slot payment terminals and secure access systems.

FAQ

What is the primary function of the TDA8026ET/C2,557 in a payment terminal?

The TDA8026ET/C2,557 serves as the analog smart card interface IC in EMV-compliant point-of-sale terminals, managing power, clock, reset, and I/O for up to two main cards and four Security Access Modules (SAMs). It integrates a DC-to-DC converter, ISO 7816-3 compliant voltage regulation, and hardware-level protection to eliminate external components and simplify certification. The TDA8026ET/C2,557 directly replaces discrete analog front-ends in secure payment hardware.

Does the TDA8026ET/C2,557 support both 1.8 V and 3 V smart cards?

Yes, the TDA8026ET/C2,557 supports 1.8 V, 3 V, and 5 V smart cards on all five VCC(n) outputs with ±5% accuracy per ISO 7816-3. Each VCC(n) pin delivers regulated voltage with current limiting (~100 mA) and handles AC current spikes (e.g., 11.1 nAs for 1.8 V cards). The TDA8026ET/C2,557 automatically configures voltage levels per slot via I²C registers, enabling mixed-voltage card operation in a single terminal.

How does the TDA8026ET/C2,557 handle card insertion and removal events?

The TDA8026ET/C2,557 provides hardware-based card presence detection on slots 1 and 2 with 17.8 ms typical debouncing, plus status inputs (STAP3–STAP5) for slots 3–5. Upon insertion or removal, it generates an interrupt (IRQN) to the microcontroller and initiates automatic activation/deactivation sequences - including controlled VCC ramp-down, RST assertion, and thermal fault response. The TDA8026ET/C2,557 maintains IRQN functionality even in shutdown mode for slot 1.

What power-saving modes does the TDA8026ET/C2,557 offer?

The TDA8026ET/C2,557 offers three power modes: Shutdown (25 µA), Standby (300–450 µA), and Active (210–260 mA). In Active mode, it supports clock-stop sub-mode for inactive slots, reducing current to 3.7 mA. Power reduction is triggered automatically when slots are idle or via I²C command. The TDA8026ET/C2,557 enters shutdown when SDWNN is pulled low, retaining only slot 1 presence monitoring - critical for battery-backed POS devices.

Is the TDA8026ET/C2,557 compatible with the I²C-bus standard?

Yes, the TDA8026ET/C2,557 implements a full I²C-bus slave interface compliant with Standard Mode (100 kHz) and Fast Mode (400 kHz), including START/STOP condition detection, acknowledge handling, and 7-bit addressing with A0-pin selectable device address. It uses open-drain SDA/SCL pins referenced to VDD(INTF), supports multi-master arbitration, and integrates internal pull-ups. The TDA8026ET/C2,557 relies on this interface for all configuration, status readback, and bank/page register access.