Infineon Technologies AUIRS2118S

Overview

AUIRS2118S from Infineon Technologies (formerly International Rectifier) is a single-channel high-side gate driver IC designed to drive N-channel MOSFETs and IGBTs in automotive and industrial half-bridge configurations. It operates with floating channel up to +600 V offset, supports 10–20 V gate supply, delivers 290 mA source / 600 mA sink peak output current, and features out-of-phase logic input/output behavior - used in BLDC motor inverters and piezo fuel injection systems.

For engineers reviewing the AUIRS2118S datasheet, AUIRS2118S pinout, AUIRS2118S application, or AUIRS2118S equivalent, key selection criteria include its 600 V VS offset rating, 140 ns typical propagation delay, undervoltage lockout thresholds (7.2–9.6 V for VBS/VCC), CMOS Schmitt-triggered input with internal pull-up, and AEC-Q100 qualified SOIC-8 package.

Technical Context

The AUIRS2118S integrates a high-voltage level shifter and latch-immune HVIC technology to enable robust high-side switching in noisy automotive environments. Its functional block includes pulse filtering, UV detection on both VBS and VCC rails, and a dedicated high-current buffer stage driving HO with 290 mA/600 mA asymmetrical drive capability.

Unlike the in-phase AUIRS2117S, this variant inverts logic input to output: a high IN drives HO low, enabling direct interface with complementary PWM controllers requiring inverted gate signals. The VS pin tolerates –5 V to +600 V transients at up to 50 V/ns dV/dt, ensuring reliable operation during fast-switching transitions.

Key Specifications

Pinout & Package

Package: 8-Lead SOIC (SOIC-8N), RoHS-compliant, MSL3, AEC-Q100 qualified.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IRS2118PbF and UCC27712DR, the AUIRS2118S uniquely combines AEC-Q100 qualification, fully integrated high-side level shifting, and inverter logic - making it optimal for space-constrained, safety-critical automotive power stages where reliability and integration are prioritized over raw current capability.

Availability

AUIRS2118S is available at Aetrix Electronics and suitable for automotive piezo injection systems, BLDC motor inverters, industrial AC drives, and on-board charger half-bridges requiring stable component supply across extended product lifecycles.

Supply support for AUIRS2118S 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 microcontrollers, and high-voltage analog ICs, with core expertise in ruggedized driver solutions.

The AUIRS2118S belongs to Infineon's automotive-qualified high-voltage gate driver product line, engineered specifically for robust high-side switching in harsh automotive environments - including engine control, electrified powertrain, and battery management subsystems.

FAQ

What is the purpose of the two NC pins (pins 4 and 5) on the AUIRS2118S?

Pins 4 and 5 are internally unconnected and must remain electrically floating on the PCB. They serve no functional role and are not tied to any internal circuitry. Soldering or routing traces to these pins may cause mechanical stress or unintended coupling, potentially degrading performance or reliability - especially under thermal cycling in automotive applications.

Can the AUIRS2118S drive both MOSFETs and IGBTs reliably?

Yes - the AUIRS2118S is explicitly characterized for both N-channel MOSFETs and IGBTs. Its 290 mA source / 600 mA sink capability, 140 ns propagation delay, and 600 V VS rating meet the gate drive requirements of typical 600 V-class power devices. Application Note AN-978 confirms validated waveforms for both device types under 400 V DC-link conditions.

How does the out-of-phase logic behavior affect PWM controller interface design?

The AUIRS2118S inverts the input signal: a logic-high IN forces HO low, and vice versa. This simplifies interface with non-inverting PWM controllers (e.g., TI C2000, ST STM32 TIM modules), eliminating external inverters. Designers must ensure complementary PWM outputs are disabled during boot or fault states to avoid shoot-through due to inherent inversion.

Is external bootstrap diode required when using the AUIRS2118S?

Yes - an external 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 IC does not integrate this diode. Failure to include it results in insufficient VBS voltage, triggering UVLO and disabling HO output after initial startup.