STMicroelectronics ST8034PQR

Overview

ST8034PQR from STMicroelectronics is a QFN16-packaged smartcard interface IC compliant with ISO 7816 and EMV™ 4.3, providing complete analog card control including 1.8 V/3 V/5 V selectable VCC generation, integrated crystal oscillator or external clock input, and thermal/short-circuit protection on all card contacts. It serves as the dedicated interface between microcontrollers and contact smartcards in secure payment terminals.

For engineers reviewing the ST8034PQR datasheet, ST8034PQR pinout, ST8034PQR application, or ST8034PQR equivalent, key selection criteria include its triple-voltage VCC_SEL pin support (1.8 V/3 V/5 V), PORADJ-adjustable voltage supervisor, QFN16 space-saving footprint, and guaranteed operation from –25 °C to +85 °C in banking and identification readers.

Technical Context

The ST8034PQR integrates a programmable LDO-based VCC generator with controlled slew rate (0.025–0.300 V/μs) and automatic activation/deactivation sequencing triggered by CMDVCC. Its voltage supervisor uses the PORADJ pin to set VDD(INTF) threshold via external resistor divider, enabling flexible interface supply monitoring.

It supports card clock frequencies up to 20 MHz with synchronous CLKDIV-controlled division and accepts either internal crystal (XTAL1/XTAL2) or external clock (CLKIN). The I/O line features a 9 kΩ pull-up to VCC, while OFF provides debounced card status interrupt with 20 kΩ internal pull-up to VDD(INTF).

Key Specifications

Pinout & Package

ST8034PQR is housed in a thermally optimized QFN16 package (3 mm × 3 mm, 0.5 mm pitch) with exposed thermal pad (not electrically connected). Pin 1 is marked by a dot; top-through view orientation matches Figure 5 of DocID024587 Rev 4.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ST8034CQR, ST8034PQR trades chip select for VCC_SEL-enabling direct 1.8 V card support without firmware adaptation-while both retain PORADJ and QFN16 advantages over the legacy SO16 ST8034ATDT.

Availability

ST8034PQR is available at Aetrix Electronics and suitable for EMV™ payment terminals, secure ID readers, pay-TV conditional access modules, and tachograph smartcard interfaces requiring stable component supply across extended temperature and long product lifecycles.

Supply support for ST8034PQR 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, analog ICs, and smart power solutions for industrial, automotive, and consumer markets.

The ST8034 product line delivers fully integrated, standards-compliant smartcard interface ICs optimized for secure financial, identification, and transportation applications with minimal external components.

FAQ

What is the function of the VCC_SEL pin on ST8034PQR?

The VCC_SEL pin is a dedicated hardware control that selects the smartcard supply voltage: logic high configures VCC = 5 V, logic low sets VCC = 3 V, and leaving it floating enables VCC = 1.8 V. This eliminates software configuration overhead and ensures deterministic voltage selection at power-up, critical for mixed-voltage card fleets in banking terminals.

How does the PORADJ pin affect system reliability?

PORADJ allows designers to set the VDD(INTF) power-on reset threshold using an external resistor divider, enabling precise coordination with the host microcontroller's supply ramp. This prevents race conditions during power-up and ensures the ST8034PQR remains in reset until the MCU interface supply is stable-improving boot reliability in multi-rail systems.

Can ST8034PQR drive a 20 MHz smartcard clock with external crystal?

Yes. ST8034PQR supports up to 20 MHz card clock frequency using either an internal crystal oscillator (via XTAL1/XTAL2) or external clock source (via CLKIN). When using crystal, the maximum recommended frequency is 20 MHz; CLKIN accepts CMOS-level inputs up to 20 MHz with synchronous CLKDIV-based division.

What thermal performance can be expected in QFN16 layout?

In standard JEDEC multilayer PCB layout, ST8034PQR's QFN16 package achieves R_THJA = 60 °C/W. With proper thermal pad soldering (≥80% coverage) and 4–6 thermal vias to inner ground planes, junction temperature rise remains within safe limits (<125 °C) even at full 70 mA IDDP load and 85 °C ambient.