Infineon Technologies AUIRS4426S

Overview

AUIRS4426S from Infineon Technologies (formerly International Rectifier) is an automotive-qualified dual low-side gate driver IC designed to drive two N-channel power MOSFETs or IGBTs in push-pull, half-bridge, or DC-DC converter topologies. It features matched 70 ns / 65 ns turn-on/turn-off propagation delays, 6–20 V gate drive supply range, and ±2.3 A / +3.3 A peak output current capability, enabling precise timing control in hybrid powertrain and direct fuel injection systems.

For engineers reviewing the AUIRS4426S datasheet, AUIRS4426S pinout, AUIRS4426S application, or AUIRS4426S equivalent, key selection criteria include automotive AEC-Q100 qualification, latch-immune CMOS input stage, SOIC-8 package thermal resistance (R_thJA = 200 °C/W), and guaranteed propagation delay matching between channels under -40°C to +125°C operation.

Technical Context

The AUIRS4426S integrates two independent high-current low-side drivers with CMOS Schmitt-triggered inputs, eliminating external hysteresis components. Each channel delivers 2.3 A sink and 3.3 A source peak current into capacitive loads up to 1 nF, with rise/fall times of 15–35 ns and 25–50 ns respectively at V_S = 15 V and T_A = 25°C.

Its functional block includes latch-immune logic circuitry, matched delay paths for INA/INB inputs, and output stages optimized to minimize cross-conduction during switching transitions. The device operates across a wide ambient temperature range (-40°C to +125°C) and supports fixed 6–20 V gate supply voltage without requiring bootstrap or level-shifting circuitry.

Key Specifications

Pinout & Package

Package: 8-Lead SOIC (SOIC-8N), RoHS-compliant, MSL3 per J-STD-020.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPIC2603D and LM5113SD, the AUIRS4426S uniquely combines AEC-Q100 qualification, matched dual-channel propagation delay, and SOIC-8 thermal performance-making it the only option qualified for safety-critical automotive powertrain timing applications where channel-to-channel skew must be minimized.

Availability

AUIRS4426S is available at Aetrix Electronics and suitable for hybrid powertrain inverters, direct fuel injection systems, and automotive DC-DC converters requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for AUIRS4426S 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 German semiconductor manufacturer specializing in power management, automotive electronics, and industrial control ICs, with leadership in high-reliability gate driver solutions.

The AUIRS4426S belongs to Infineon's automotive-grade gate driver product line, engineered specifically for timing-critical, high-noise powertrain applications including electric vehicle inverters and precision fuel injection systems.

FAQ

Is the AUIRS4426S pin-compatible with the non-automotive IR4426?

No. While functionally similar, the AUIRS4426S uses an automotive-qualified die and enhanced ESD protection (H3A, C5, M3 classes), resulting in different internal layout and qualification-specific test structures. Pin numbering matches, but electrical behavior under transient stress differs-designs requiring AEC-Q100 compliance must use the AUIRS4426S variant.

What is the maximum recommended gate capacitance for stable operation?

The AUIRS4426S is characterized with C_L = 1000 pF, and its 15–35 ns rise time supports stable driving of up to 2.2 nF total gate capacitance (including Miller and package parasitics) at V_S = 15 V. For >2.2 nF loads, external gate resistors should be added to limit peak current and prevent ringing.

Does the AUIRS4426S support 3.3 V logic inputs?

Yes. Its CMOS Schmitt-triggered inputs accept logic-high thresholds down to 2.7 V and logic-low thresholds up to 0.8 V, making them compatible with 3.3 V microcontrollers without level shifting. Input bias current remains below ±30 µA across -40°C to +125°C, ensuring reliable interfacing with low-power MCUs.

Can unused NC pins be grounded for improved EMI performance?

No. Pins 1 and 8 are internally unconnected and must remain floating or left unpopulated on the PCB. Grounding them may introduce parasitic coupling paths or violate internal isolation barriers, potentially degrading latch immunity and ESD robustness-per IRF application note AN-1001 layout guidance.