Infineon Technologies AUIRS21844S

Overview

AUIRS21844S from Infineon Technologies (formerly International Rectifier) is an automotive-grade high-voltage half-bridge gate driver IC designed to control N-channel MOSFETs or IGBTs in high-side/low-side configurations up to 600 V. It features 3.3 V/5 V logic compatibility, internal dead-time generation (400 ns typ. at R_DT = 0 Ω), matched propagation delays (600 ns / 230 ns), and independent undervoltage lockout on both V_CC and V_BS supplies - deployed in 48 V starter-alternator systems and piezo fuel injectors.

For engineers reviewing the AUIRS21844S datasheet, AUIRS21844S pinout, AUIRS21844S application, or AUIRS21844S equivalent, key selection criteria include bootstrap-compatible floating channel operation, dV/dt immunity up to 50 V/ns, ±5 V logic/power ground offset tolerance, 1.9 A source / 2.3 A sink peak output current, and AEC-Q100 qualification for under-hood automotive power stages.

Technical Context

The AUIRS21844S integrates a high-voltage level shifter with latch-immune CMOS architecture to enable robust floating high-side drive referenced to VS, supporting operation across −5 V to +600 V offset. Its internal dead-time generator uses a programmable DT pin to adjust interlock delay from 280 ns to 6 µs, while dual UVLO circuits independently monitor V_CC (8.9 V threshold) and V_BS (8.9 V threshold) with 0.7 V hysteresis.

Propagation delay matching between HO and LO channels is tightly controlled (±90 ns turn-on, ±40 ns turn-off), and the output stage employs lower di/dt gate drive design to suppress noise-induced false triggering. Logic inputs (IN, SD) are zener-clamped to 5.2 V and tolerate ±5 V ground offset relative to COM.

Key Specifications

Pinout & Package

Package: 14-lead narrow-body SOIC (SOIC14N), RoHS-compliant, MSL3 per J-STD-020.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar half-bridge gate driver applications.

Compared with IRS21844PbF, the AUIRS21844S adds automotive qualification and enhanced reliability testing; versus UCC27211D, it trades raw current capability for built-in safety features like dual UVLO and programmable deadtime - reducing BOM count and layout complexity in production automotive inverters.

Availability

AUIRS21844S is available at Aetrix Electronics and suitable for starter/alternator systems, piezo fuel injection modules, bi-directional DC/DC converters, and HVAC pump/compressor drives requiring stable component supply across extended automotive lifecycles.

Supply support for AUIRS21844S 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 deep expertise in high-voltage IC design and automotive qualification.

The AUIRS21844S belongs to Infineon's automotive-qualified HVIC (High-Voltage IC) family, engineered specifically for robust, high-reliability gate driving in electrified vehicle powertrain subsystems.

FAQ

What is the purpose of the DT pin on the AUIRS21844S?

The DT pin sets programmable deadtime between LO turn-off and HO turn-on (and vice versa) using an external resistor. With R_DT = 0 Ω, deadtime is 400 ns; with R_DT = 200 kΩ, it extends to 5 µs. This prevents shoot-through by ensuring both outputs are never active simultaneously, critical for inductive load safety.

Can the AUIRS21844S drive SiC MOSFETs?

Yes - its 1.9 A source / 2.3 A sink peak output current, 600 V rating, and 50 V/ns dV/dt immunity make it compatible with common 650 V SiC MOSFETs. However, gate resistor values must be optimized for SiC's lower Q_g and faster switching to avoid excessive ringing or overshoot.

How does the AUIRS21844S handle negative VS transients?

The device tolerates negative VS transients down to −5 V relative to COM due to internal level-shifter design and clamping structures. This enables reliable operation during inductive kickback events in motor and solenoid drive applications without external protection circuitry.

Is V_SS required to be connected in all designs?

Yes - V_SS must be connected to a stable logic ground, even if it shares the same net as COM. The ±5 V offset tolerance between V_SS and COM provides noise isolation for input logic, and leaving V_SS unconnected risks undefined behavior or latch-up under high-noise conditions.