Infineon Technologies AUIRS21811S

Overview

AUIRS21811S from Infineon Technologies (formerly International Rectifier) is an automotive-grade high- and low-side gate driver IC designed to independently control N-channel MOSFETs or IGBTs in half-bridge configurations. It features 600 V offset capability, 135 ns matched propagation delay (HO/LO), 1.9 A source / 2.3 A sink output current, 10–20 V gate drive supply range, and 3.3 V/5 V logic compatibility - enabling robust operation in electric power steering and piezo fuel injection systems.

For engineers reviewing the AUIRS21811S datasheet, AUIRS21811S pinout, AUIRS21811S application, or AUIRS21811S equivalent, key selection criteria include bootstrap-compatible floating channel architecture, dV/dt immunity up to 50 V/ns, undervoltage lockout on both channels, matched timing for synchronous switching, and AEC-Q100 qualification for automotive under-hood environments.

Technical Context

The AUIRS21811S integrates a high-voltage level-shifting circuit with latch-immune CMOS logic to enable reliable high-side switching at up to +600 V VS offset. Its floating channel uses proprietary HVIC technology, supporting bootstrap gate drive without external level shifters or isolated supplies.

Both HO and LO outputs deliver matched 135 ns propagation delays (typ.) across -40°C to +125°C, with independent UVLO thresholds (8.9 V ±0.7 V hysteresis) on VCC and VBS rails. Input logic accepts CMOS/LSTTL signals down to 3.3 V, and output stages are optimized for low di/dt noise sensitivity via controlled rise/fall times (tr ≤ 60 ns, tf ≤ 35 ns).

Key Specifications

Pinout & Package

Package: 8-lead SOIC (Small Outline Integrated Circuit), RoHS-compliant, MSL3, rated for automotive temperature range (–40°C to +125°C).

Key Features

Applications

Equivalent & Alternatives

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

Compared with IRS21811S, the AUIRS21811S adds automotive qualification and extended temperature capability at identical performance; versus UCC27211A, it trades peak current for integrated high-side level shifting and 600 V robustness - making it uniquely suited for automotive half-bridge inverters without auxiliary level-shifting circuitry.

Availability

AUIRS21811S is available at Aetrix Electronics and suitable for electric power steering, piezo fuel injection, and 48 V mild-hybrid starter-alternator systems requiring stable component supply across multi-year automotive production cycles.

Supply support for AUIRS21811S 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 acquired International Rectifier in 2015 and continues its legacy of high-voltage power semiconductors and drivers, with global manufacturing and automotive qualification infrastructure.

The AUIRS21811S belongs to Infineon's automotive-qualified high- and low-side driver product line, engineered specifically for robust half-bridge control in safety-critical vehicle subsystems including steering, braking, and powertrain electrification.

FAQ

Can the AUIRS21811S drive IGBTs directly?

Yes. The AUIRS21811S delivers 1.9 A source and 2.3 A sink peak output current with 135 ns propagation delay, sufficient to drive standard 15–75 A IGBTs used in automotive inverters. Its 10–20 V gate drive range aligns with typical IGBT VGE requirements, and dV/dt immunity prevents false triggering during high dv/dt switching events.

What bootstrap capacitor value is recommended for AUIRS21811S?

A minimum 0.1 µF ceramic capacitor is recommended between VB and VS pins, placed close to the device with short traces. For 20 kHz operation driving a 50 nC gate charge, a 0.22 µF X7R capacitor provides adequate charge replenishment and ripple suppression. Larger values improve margin but increase startup time and layout area.

Does AUIRS21811S include built-in dead-time control?

No. The AUIRS21811S has independent HIN and LIN inputs with no internal logic for dead-time insertion. Dead time must be generated externally by the controller (e.g., MCU or PWM generator) to prevent shoot-through. Its matched 135 ns propagation delays simplify precise dead-time implementation in firmware or hardware timers.

Is AUIRS21811S pin-compatible with IRS21811S?

Yes. AUIRS21811S and IRS21811S share identical pinout, package (8-lead SOIC), and electrical specifications. The only differences are automotive qualification (AEC-Q100), extended temperature rating (–40°C to +125°C), and tighter process controls - making AUIRS21811S a drop-in replacement where automotive reliability is required.