Infineon Technologies AUIRS44261S

Overview

AUIRS44261S 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, 4.8–20 V gate drive supply range, and ±2.3 A / +3.3 A peak output current capability. Used in hybrid powertrain drives and direct fuel injection systems.

For engineers reviewing the AUIRS44261S datasheet, AUIRS44261S pinout, AUIRS44261S application, or AUIRS44261S equivalent, key selection criteria include automotive AEC-Q100 qualification, latch-immune CMOS input stage, output phase inversion relative to inputs, and SOIC-8 package compatibility with high-current PCB layout requirements.

Technical Context

The AUIRS44261S integrates two independent high-current buffer stages with matched propagation delay paths, enabling precise timing control in synchronous switching applications. Its CMOS Schmitt-triggered inputs scale logic thresholds proportionally to Vs (e.g., VIH = 0.5×Vs + 0.3 V), ensuring robust noise immunity across the full 4.8–20 V supply range.

Each output stage delivers asymmetric peak current: IO+ = 2.3 A (sink) and IO− = 3.3 A (source) at VS = 15 V, CL = 1000 pF. The device operates over −40°C to +125°C ambient and meets AEC-Q100 Grade 0 (TJ ≤ 150°C) with MSL3 moisture sensitivity rating.

Key Specifications

Pinout & Package

Package: 8-Lead SOIC (SOIC-8N), RoHS-compliant, MSL3, lead-free.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM5112-Q1 and UCC27524A-Q1, the AUIRS44261S uniquely combines Vs-proportional inputs, guaranteed channel-matched propagation delay (<10 ns mismatch), and 20 V gate drive support-making it irreplaceable in high-voltage push-pull and hybrid powertrain applications requiring precise timing alignment.

Availability

AUIRS44261S is available at Aetrix Electronics and suitable for automotive powertrain control, DC-DC conversion, and direct fuel injection systems requiring stable component supply across extended temperature and voltage ranges.

Supply support for AUIRS44261S 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 solutions, with core expertise in high-reliability analog and mixed-signal ICs.

The AUIRS44261S belongs to Infineon's automotive-grade gate driver product line, engineered specifically for demanding under-hood applications including hybrid electric vehicle inverters and precision engine control systems.

FAQ

What is the maximum allowable supply voltage (V_S) for continuous operation?

The AUIRS44261S supports continuous operation up to 20 V on the V_S pin, with absolute maximum rating of 25 V. Operation above 20 V violates recommended conditions and risks exceeding thermal limits or degrading long-term reliability, especially at high ambient temperatures. Derating is required above 125°C junction temperature.

Does the AUIRS44261S support 3.3 V logic input levels?

No. Input thresholds scale with V_S: VIH ≈ 0.5×V_S + 0.3 V and VIL ≈ 0.15×V_S + 0.08 V. At V_S = 12 V, VIH ≈ 6.3 V - so 3.3 V logic signals cannot reliably drive the inputs. A level-shifting interface or compatible microcontroller with 5 V–12 V GPIO is required.

Are the two output channels truly independent, or do they share internal resources?

The channels are functionally independent with separate input buffers, pre-driver stages, and output drivers - confirmed by functional block diagram and matched propagation delay specification. However, both share the same V_S and GND pins, so high-current switching on one channel induces shared supply bounce that must be mitigated with local decoupling capacitors near each output.

Can the AUIRS44261S drive IGBTs directly without external components?

Yes. With 3.3 A peak source and 2.3 A peak sink capability, the AUIRS44261S can directly drive small-to-medium IGBTs (up to ~50 A rated) in hard-switching applications. For larger IGBTs or soft-switching topologies, external gate resistors and negative turn-off bias may still be required to control dV/dt and prevent false triggering.