NXP Semiconductors TDA8026ET/C3K

Overview

TDA8026ET/C3K from NXP Semiconductors is a smart card interface IC for multi-slot Point-of-Sale (POS) terminals, supporting up to two synchronous/asynchronous main cards and four Security Access Modules (SAMs). It operates from 2.7–5.5 V supply, delivers regulated 5 V/3 V/1.8 V card power with ±5% accuracy, and integrates thermal/short-circuit protection on all five card slots.

For engineers reviewing the TDA8026ET/C3K datasheet, TDA8026ET/C3K pinout, TDA8026ET/C3K application, or TDA8026ET/C3K equivalent, key selection considerations include ISO 7816-3/EMV 4.31 compliance, I²C-bus control (100/400 kHz), TFBGA64 package with 64-ball layout, shutdown mode current ≤40 µA, and integrated DC-to-DC converter enabling dual full-load card operation.

Technical Context

The TDA8026ET/C3K implements a dedicated analog interface architecture with five independent card channel controllers, each featuring buffered bidirectional I/O (±15 mA, 1 MHz max), programmable RST output (20 mA), and clock generation up to 20 MHz with selectable division (1/2/4/5). Its power management includes three operational modes-shutdown (≤40 µA), standby (≤450 µA), and active (≤260 mA)-with automatic deactivation sequences triggered by short-circuit, card removal, or voltage dropout.

Card slot control is managed via I²C-bus slave interface (Standard/Fast mode), with banked register architecture (Bank 0 for slot selection/interrupt status, Bank 1 for per-slot configuration) and hardware address selection via A0 pin. The integrated DC-to-DC converter supplies VCC(n) rails while internal voltage regulator provides stable 3.3 V (VDD(INTREGD)) for analog circuitry.

Key Specifications

Pinout & Package

TFBGA64 package (SOT1073-1), 5 mm × 5 mm, 0.5 mm pitch, top-view ball map with index area at ball A1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SLB9670 and TDA8029ET/C3, the TDA8026ET/C3K offers optimal cost-performance balance for standard indoor POS terminals, delivering full EMV 4.31 compliance and five-slot management without requiring firmware changes or PCB redesign - unlike SLB9670, and at lower unit cost than TDA8029ET/C3.

Availability

TDA8026ET/C3K is available at Aetrix Electronics and suitable for Point-of-Sale terminals, EMV-certified kiosks, and banking self-service terminals requiring stable component supply across multi-year production cycles.

Supply support for TDA8026ET/C3K 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 consumer applications.

The TDA8026ET/C3K belongs to NXP's smart card interface product line, engineered specifically for EMV-compliant payment terminals with multi-SAM support and stringent safety certification requirements.

FAQ

What is the primary function of the TDA8026ET/C3K in a POS terminal?

The TDA8026ET/C3K serves as the dedicated analog interface IC managing power, clock, reset, and data signals for up to five smart card slots in a Point-of-Sale terminal. It directly supports two main cards (synchronous or asynchronous) and four Security Access Modules (SAMs), ensuring ISO 7816-3 and EMV 4.31 compliance. Its integrated DC-to-DC converter, thermal protection, and hardware-controlled activation/deactivation sequences make the TDA8026ET/C3K essential for reliable, certified payment processing.

Does the TDA8026ET/C3K support both 5 V and 3 V smart cards?

Yes, the TDA8026ET/C3K supports 5 V, 3 V, and 1.8 V smart cards simultaneously across its five card slots. Each VCC(n) output delivers regulated voltage with ±5% accuracy - 4.75–5.25 V for 5 V cards, 2.85–3.15 V for 3 V cards, and 1.71–1.89 V for 1.8 V cards - meeting ISO 7816-3 specifications. The device automatically configures appropriate current limits and timing parameters per card type, and the TDA8026ET/C3K datasheet confirms this capability in Table 1's VCC parameter definitions.

How does the TDA8026ET/C3K handle power management during card inactivity?

The TDA8026ET/C3K implements three distinct power modes: shutdown (≤40 µA), standby (≤450 µA), and active (≤260 mA). In shutdown mode - activated by driving SDWNN low - only card slot 1 presence monitoring remains active, generating an IRQN interrupt on insertion/removal. For inactive slots in active mode, it enters clock-stop sub-mode, reducing VCC(n) current to 2 mA while maintaining presence detection. This behavior is explicitly defined in Section 8.2.3 of the TDA8026ET/C3K datasheet and enables >90% power reduction versus full-active operation.

Is the TDA8026ET/C3K compatible with I²C-bus Fast mode?

Yes, the TDA8026ET/C3K supports I²C-bus Fast mode at 400 kHz in addition to Standard mode at 100 kHz. Its SDA and SCL pins are designed as open-drain interfaces referenced to VDD(INTF), with internal pull-ups compliant with I²C specification timing requirements. Section 8.4.1 of the TDA8026ET/C3K datasheet explicitly states "I²C-bus slave operating either Standard mode (100 kHz) or Fast mode (400 kHz)", and Table 4 confirms SDA (C2) and SCL (B2) as VDD(INTF)-referenced I/O pins with proper voltage thresholds.

What protection features does the TDA8026ET/C3K provide for card slot reliability?

The TDA8026ET/C3K integrates thermal protection, short-circuit protection, and 6 kV HBM ESD protection on all card-side pins (VCC(n), RST(n), CLK(n), I/O(n)). It also features automatic deactivation sequences triggered by short-circuit, card removal, or voltage dropout on VDD(INTF), VDD, or VUP. These protections are confirmed in Sections 2 (Features and benefits) and 8.2.4.1 of the TDA8026ET/C3K datasheet, which state that "thermal protection and short-circuit protection on all card contacts" are implemented, and that "automatic activation and deactivation sequences [are] initiated by the software or hardware" during fault conditions.