Infineon Technologies AUIRS21271S

Overview

AUIRS21271S from Infineon Technologies (formerly International Rectifier) is an automotive-grade, high-voltage, single-channel IGBT/MOSFET gate driver with integrated desaturation over-current protection and fault reporting. It operates up to +600 V offset voltage, delivers 290 mA source / 600 mA sink peak output current, and features 200 ns turn-on / 175 ns turn-off propagation delays. Used in high-side motor drive stages of forklift inverters and hydraulic pump controllers.

For engineers reviewing the AUIRS21271S datasheet, AUIRS21271S pinout, AUIRS21271S application, or AUIRS21271S equivalent, key selection criteria include its 9–20 V automotive gate drive range, dV/dt-immune floating channel, undervoltage lockout thresholds (6.3–8.2 V VBSUV), open-drain FAULT signaling, and AEC-Q100 qualification for under-hood motor control systems.

Technical Context

The AUIRS21271S integrates a latch-immune HVIC process with CMOS logic to enable robust high-side switching up to 600 V VS offset. Its desaturation detection circuit monitors VCS with 1.5–2.1 V positive-going threshold and triggers shutdown within 65–360 ns, followed by FAULT assertion in 270–510 ns.

It supports in-phase input-to-output logic (unlike AUIRS21281S), features 3.3 V/5 V/15 V logic-compatible inputs, and includes start-up blanking time (475–985 ns) to suppress false desaturation trips during power-up transients.

Key Specifications

Pinout & Package

Supplied in an 8-lead SOIC package with creepage/clearance compliant for 600 V operation and MSL3 rating per J-STD-020.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IRS21271PbF, AUIRS21271S adds guaranteed −40°C to +150°C operation and full AEC-Q100 stress testing; versus UCC21520QDWKQ1, it trades isolation and dual-channel capability for lower cost, smaller size, and built-in protection-ideal for cost-sensitive, single-channel automotive motor drives.

Availability

AUIRS21271S is available at Aetrix Electronics and suitable for forklift motor drives, hydraulic pump controllers, and auxiliary inverters requiring stable component supply across extended automotive lifecycles.

Supply support for AUIRS21271S 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 ICs and silicon carbide technologies.

The AUIRS21271S belongs to Infineon's automotive gate driver product line, engineered specifically for robust high-side IGBT/MOSFET control in traction, auxiliary, and hydraulic motor systems under harsh environmental conditions.

FAQ

What is the purpose of the CS pin on the AUIRS21271S?

The CS (Current Sense) pin monitors the voltage drop across an external sense resistor connected between the IGBT emitter and power ground. When the sensed voltage exceeds 1.5–2.1 V-indicating desaturation-the device disables the HO output within 65–360 ns and asserts the FAULT signal. This protects the IGBT from destructive overcurrent conditions without requiring external comparators or timers.

Can the AUIRS21271S drive SiC MOSFETs?

Yes, the AUIRS21271S can drive 650 V SiC MOSFETs in high-side configurations, provided gate drive voltage (8.4–20 V) and timing (200 ns tON) meet the device's requirements. However, its lack of Miller clamp and absence of dedicated SiC-specific features (e.g., negative turn-off voltage) means external gate resistors and layout optimization remain critical for reliable switching.

How does the FAULT pin behave during undervoltage lockout?

During VBS undervoltage lockout (when VBS falls below 6.0–7.7 V), the AUIRS21271S disables HO and pulls the open-drain FAULT pin low. The FAULT signal remains asserted until VBS recovers above the positive-going threshold (6.3–8.2 V) and the internal blanking timer expires-ensuring stable restart after bootstrap capacitor recharge.

Is a bootstrap diode required when using the AUIRS21271S?

Yes, a fast-recovery bootstrap diode (e.g., 1N4148WS or equivalent) is mandatory between VCC and VB to charge the bootstrap capacitor during low-side conduction. The diode must withstand ≥600 V reverse voltage and support ≥1 mA average charging current; improper selection causes VBS droop and premature UVLO shutdown during high-duty-cycle operation.