Infineon Technologies AUIRS2128S

Overview

AUIRS2128S from Infineon Technologies (formerly International Rectifier) is an automotive-grade, high-voltage, single-channel IGBT/MOSFET gate driver with desaturation over-current protection and inverting logic output. 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. It is used in high-side IGBT drive circuits for electric power steering and hydraulic pump inverters.

For engineers reviewing the AUIRS2128S datasheet, AUIRS2128S pinout, AUIRS2128S application, or AUIRS2128S equivalent, key selection criteria include its 600 V floating channel rating, desaturation detection threshold (250 mV typ), FAULT open-drain reporting, 9–20 V gate drive range, and AEC-Q100 qualification for automotive traction systems.

Technical Context

The AUIRS2128S integrates a latch-immune HVIC process with CMOS logic to enable robust high-side switching at up to 600 V VS offset. Its desaturation (CS) comparator triggers shutdown when V_CS exceeds 250 mV (typ), with 65–360 ns propagation delay to internal protection activation.

It uses an inverting input-output relationship (HIN = 1 → HO = 0), supports 3.3 V/5 V/15 V logic inputs, and includes undervoltage lockout on V_BS (10.3 V typ rising threshold) and V_CC, plus dV/dt immune level-shifting for noisy motor drive environments.

Key Specifications

Pinout & Package

Supplied in an 8-lead SOIC package (SOIC-8, body size 5.0 mm × 6.2 mm, pitch 1.27 mm), with creepage/clearance compliant for 600 V applications and MSL3 moisture sensitivity rating.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IR2128S, AUIRS2128S adds automotive qualification, tighter protection thresholds, and extended temperature support; versus UCC21520DW, it trades isolation for lower cost and integrated fault detection-ideal for non-isolated, cost-sensitive automotive inverters.

Availability

AUIRS2128S is available at Aetrix Electronics and suitable for electric power steering, hydraulic pump inverters, and tractor PTO motor drives requiring stable component supply across automotive production lifecycles.

Supply support for AUIRS2128S 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 ICs, with deep expertise in high-voltage gate driver innovation.

The AUIRS2128S belongs to Infineon's automotive-qualified HVIC gate driver family, engineered specifically for robust, high-reliability IGBT and MOSFET control in electric vehicle traction and auxiliary systems.

FAQ

What is the purpose of the CS pin on AUIRS2128S?

The CS (Current Sense) pin monitors the voltage across an external sense resistor connected between the IGBT emitter and power ground. When V_CS exceeds 250 mV (typ), the internal comparator triggers desaturation protection, disabling the HO output and pulling FAULT low within 65–360 ns. This provides fast, integrated short-circuit protection without external comparators.

Can AUIRS2128S drive both IGBTs and MOSFETs?

Yes-AUIRS2128S is designed to drive both N-channel IGBTs and MOSFETs. Its 290 mA source / 600 mA sink output current and 12–20 V gate drive range support typical gate charge requirements for devices up to 30 A/600 V. The desaturation protection is optimized for IGBTs but remains effective for MOSFET over-current detection using appropriate sense resistor values.

How does the FAULT pin behave during undervoltage lockout?

During V_BS or V_CC undervoltage lockout, the FAULT pin is actively pulled low, identical to desaturation fault behavior. This unified signaling simplifies MCU fault-handling firmware-any FAULT assertion requires gate disable and diagnostic logging, regardless of root cause (over-current or supply dropout).

Is external bootstrap diode required for AUIRS2128S operation?

Yes-an external fast-recovery bootstrap diode (e.g., 1N4148WS or equivalent) and capacitor (typically 0.1–0.22 µF X7R) are mandatory. The diode charges the V_BS capacitor during low-side conduction; insufficient diode speed or capacitance causes V_BS droop, triggering UVLO and unintended shutdown at high duty cycles or switching frequencies above 20 kHz.