Infineon Technologies AUIRS21811STR

Overview

AUIRS21811STR 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 for both channels, 1.9 A/2.3 A typical source/sink output current, 10–20 V gate drive supply range, and 3.3 V/5 V logic compatibility - enabling use in electric power steering and piezo fuel injection systems.

For engineers reviewing the AUIRS21811STR datasheet, AUIRS21811STR pinout, AUIRS21811STR application, or AUIRS21811STR equivalent, key selection criteria include dV/dt immunity up to 50 V/ns, independent undervoltage lockout per channel, bootstrap-compatible floating high-side channel, and AEC-Q100 qualification for automotive under-hood environments.

Technical Context

The AUIRS21811STR integrates two independent gate drivers: a high-side channel referenced to VB/VS (rated ≤ +600 V) and a low-side channel referenced to COM/VSS. Its HVIC process enables latch-immune operation under fast transients, with logic inputs tolerant of -5 V to +600 V VS swing and dV/dt immunity confirmed at 50 V/ns.

Both channels feature matched 135 ns typical propagation delay (ton/toff), 1.9 A source / 2.3 A sink peak output current, and separate UVLO thresholds (8.9 V ±0.7 V hysteresis) on VCC and VBS supplies - ensuring synchronized switching and robust fault prevention during bootstrap capacitor discharge.

Key Specifications

Pinout & Package

Supplied in an 8-lead SOIC package with standard gull-wing leads, the AUIRS21811STR uses surface-mount assembly and supports JEDEC-standard reflow profiles (MSL3, 260°C peak).

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 and IRS21811SPbF, the AUIRS21811STR uniquely combines AEC-Q100 qualification, extended −40°C to +125°C operation, and validated MSL3 moisture sensitivity - making it the only option qualified for safety-critical automotive powertrain applications.

Availability

AUIRS21811STR is available at Aetrix Electronics and suitable for electric power steering, piezo injection, fan/compressor inverters, and starter-alternator systems requiring stable component supply across automotive production lifecycles.

Supply support for AUIRS21811STR 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 IC innovation, with global manufacturing and automotive qualification infrastructure.

The AUIRS21811STR belongs to Infineon's automotive gate driver product line, engineered specifically for robust half-bridge control in safety-critical 12 V–48 V–600 V powertrain and chassis systems.

FAQ

What is the maximum allowable dV/dt at the VS pin?

The AUIRS21811STR is specified to tolerate dV/dt transients up to 50 V/ns at the VS pin without false triggering or latch-up. This rating is verified per AEC-Q100 stress testing and applies across the full −40°C to +125°C junction temperature range with proper PCB layout and gate loop inductance control.

Can the AUIRS21811STR drive IGBTs directly?

Yes - the AUIRS21811STR delivers 1.9 A source and 2.3 A sink peak output current, sufficient to drive medium-power IGBTs with gate charge ≤25 nC. Its 135 ns propagation delay and matched timing ensure clean switching, though external gate resistors may be needed to limit di/dt in high-current IGBT applications.

Is bootstrap capacitor charging supported during continuous conduction mode?

No - the AUIRS21811STR requires periodic low-side conduction to recharge the bootstrap capacitor via the internal diode. In 100% duty-cycle high-side operation, an external charge pump or isolated supply is required to maintain VBS voltage above the 8.2 V UVLO threshold.

Does the part include built-in shoot-through protection?

No - the AUIRS21811STR has no internal logic-based shoot-through prevention. It relies on externally controlled complementary HIN/LIN signals with hardware-enforced dead time. The matched 135 ns propagation delay minimizes timing skew, but external gate resistors and MCU-level dead-time insertion remain essential for safe operation.