Infineon Technologies AUIRS21271STR

Overview

AUIRS21271STR from Infineon Technologies (formerly International Rectifier) is an automotive-grade, single-channel high-side/low-side IGBT and MOSFET gate driver IC with integrated desaturation (DESAT) over-current protection and open-drain FAULT reporting. It operates up to +600 V offset voltage, delivers 290 mA source / 600 mA sink peak output current, and supports 9–20 V gate drive voltage range optimized for automotive motor control. Used in hydraulic pump inverters and fork lift traction drives.

For engineers reviewing the AUIRS21271STR datasheet, AUIRS21271STR pinout, AUIRS21271STR application, or AUIRS21271STR equivalent, key selection criteria include its AEC-Q100 qualified 8-Lead SOIC package, 200 ns turn-on / 175 ns turn-off propagation delays, 7.2 V VBS undervoltage lockout threshold, desaturation detection with 1.8 V typical CS threshold, and in-phase logic-to-output polarity.

Technical Context

This driver employs a ruggedized monolithic HVIC (High-Voltage IC) process with latch-immune CMOS, enabling reliable floating channel operation at dV/dt up to 50 V/ns. Its internal bootstrap-compatible architecture supports high-side N-channel switching up to 600 V VS offset while maintaining logic-level compatibility down to 3.3 V.

The integrated DESAT protection monitors the IGBT's collector-emitter voltage via the CS pin, triggering shutdown when VCSTH+ = 1.8 V (typical) is exceeded; fault status is latched and reported on the open-drain FAULT pin with 510 ns max propagation delay from CS event to FAULT assertion.

Key Specifications

Pinout & Package

Supplied in an 8-Lead SOIC (Small Outline Integrated Circuit) package with standard gull-wing leads, RoHS-compliant and rated MSL3 per J-STD-020.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-voltage gate driver applications.

Compared with IRS21271PbF and IR21271S, the AUIRS21271STR uniquely combines AEC-Q100 qualification, RoHS compliance, MSL3 rating, and guaranteed -40°C to +125°C operation-making it the only option qualified for new automotive powertrain and chassis systems.

Availability

AUIRS21271STR is available at Aetrix Electronics and suitable for hydraulic pump inverters, fork lift traction drives, and electric power steering systems requiring stable component supply across multi-year production cycles.

Supply support for AUIRS21271STR 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

Infineon Technologies is a global semiconductor leader specializing in power management, automotive electronics, and industrial control solutions, with core expertise in high-voltage IC design and ruggedized process technologies.

The AUIRS21271STR belongs to Infineon's automotive-qualified gate driver product line, engineered specifically for functional-safety-aware motor control in electrified vehicles-including traction, steering, and auxiliary power systems.

FAQ

What is the purpose of the CS pin and how is it configured?

The CS (Current Sense) pin monitors IGBT collector-emitter voltage for desaturation detection. It connects to the emitter via a resistor-divider network that scales VCE to 1.8 V at the CS pin when the IGBT enters saturation failure. Internal hysteresis prevents chatter during transient overloads, and the FAULT pin asserts within 510 ns after threshold crossing.

Can AUIRS21271STR drive both high-side and low-side switches?

Yes-it is a floating-channel driver designed primarily for high-side N-channel devices (e.g., upper switch in half-bridge), but can also drive low-side switches when VS is tied to COM. The HO output remains functional regardless of VS potential, provided VB–VS ≤ 20 V and VS remains within –5 V to +600 V relative to COM.

What is the minimum bootstrap capacitor value recommended?

For 20 kHz operation with 50% duty cycle and 290 mA peak gate drive, a minimum 100 nF ceramic capacitor (X7R, 25 V rating) is recommended between VB and VS. Larger values (e.g., 220–470 nF) improve stability under high-duty-cycle or high-temperature conditions where VBS droop must stay above 7.2 V.

Does the FAULT pin require an external pull-up resistor?

Yes-the FAULT pin is open-drain and must be pulled up externally (typically 4.7 kΩ to VCC) to generate a valid logic-high signal during normal operation. During fault events, the internal FET pulls FAULT to COM, signaling the host controller to disable PWM and initiate safe shutdown sequence.