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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Gate Drivers

Infineon Technologies AUIRS2181S

Name: AUIRS2181S
Brand: Infineon Technologies
SKU: AUIRS2181S
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AUIRS2181S

Manufacturer:: Infineon Technologies

Category:: Gate Drivers

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: AUIRS2181S.pdf

Description:: IC GATE DRVR HALF-BRIDGE 8SOIC

Quantity:: RFQ Add To RFQ list

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Inventory:2,804

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Product details

Overview

AUIRS2181S from Infineon Technologies (formerly International Rectifier) is a high-voltage, high-speed dual-channel gate driver IC for N-channel MOSFETs and IGBTs in half-bridge configurations. It features independent high-side (up to +600 V VB) and low-side outputs, 160 ns / 200 ns typical propagation delays, 1.9 A source / 2.3 A sink peak output current, and 3.3 V / 5 V logic-compatible inputs - deployed in automotive electric power steering and common-rail fuel injection systems.

For engineers reviewing the AUIRS2181S datasheet, AUIRS2181S pinout, AUIRS2181S application, or AUIRS2181S equivalent, key selection criteria include bootstrap-enabled high-side floating operation, matched channel timing, undervoltage lockout on both VCC and VB supplies, and SOIC-8 narrow-body packaging for space-constrained motor control PCBs.

Technical Context

The AUIRS2181S integrates a ruggedized HVIC (High-Voltage IC) process with latch-immune CMOS logic to support simultaneous high-side and low-side drive in half-bridge topologies. Its floating channel operates with VS referenced to COM and tolerates dV/dt transients up to 50 V/ns, enabling reliable switching in noisy automotive environments.

It lacks programmable dead-time circuitry (unlike AUIRS21834/AUIRS21844), uses fixed HIN/LIN inputs without internal cross-conduction prevention, and relies on external timing control. Logic ground is tied to COM (not separate VSS), distinguishing it from the 14-lead AUIRS21814S variant.

Key Specifications

Parameter	Value and Actual Design Meaning
Topology	Independent high-side and low-side gate driver for half-bridge N-MOS/IGBT
V_B Max	+600 V - enables direct high-side drive in 400–600 V DC bus systems
t_ON/t_OFF	160 ns / 200 ns typical - supports >2 MHz PWM switching with matched delay
I_O+/I_O−	1.9 A / 2.3 A typical - drives gate charges of ≤100 nC MOSFETs at <100 ns rise/fall
V_CC Range	10 V to 20 V - compatible with standard 12 V/15 V gate drive rails and internal 20 V clamp
Logic Compatibility	3.3 V and 5 V CMOS/LSTTL - interfaces directly with MCU GPIO without level-shifting
UVLO Thresholds	V_CC/V_BS UV+ = 8.9 V, UV− = 8.2 V - prevents erratic switching during brown-out

Pinout & Package

Package: 8-Lead SOIC (Narrow Body), RoHS-compliant, automotive-qualified (AEC-Q100 Grade 1).

Pin/Terminal	Circuit Role	Design Meaning
V_CC	Low-side and logic supply input	Fixed 10–20 V rail powering logic core and LO driver; referenced to COM
HIN	High-side input signal	CMOS/LSTTL-compatible digital input controlling HO output state
LIN	Low-side input signal	CMOS/LSTTL-compatible digital input controlling LO output state
COM	Power and logic ground reference	Common return for V_CC, LO, and logic; serves as reference for all low-side signals
HO	High-side gate drive output	Floating output referenced to VS; drives gate of high-side N-MOS/IGBT in bootstrap configuration
LO	Low-side gate drive output	Ground-referenced output driving gate of low-side N-MOS/IGBT
VB	High-side floating supply input	Bootstrap capacitor connection point; supplies HO driver stage up to +600 V offset
VS	High-side floating source reference	Return path for VB and HO; tracks switching node voltage in half-bridge

Key Features

Feature	Design Value
Floating channel architecture	Enables high-side drive in bootstrap-based half-bridges without isolated supplies
dV/dt immunity	Withstands 50 V/ns transients on VS node - critical for noise resilience in motor phase-leg switching
Matched propagation delay	≤35 ns skew between HO and LO channels - minimizes shoot-through risk in synchronous PWM
Undervoltage lockout (UVLO)	Independent 0.7 V hysteresis on both V_CC and V_BS - ensures clean startup and fault recovery
Logic ground offset tolerance	±5 V offset between logic inputs (HIN/LIN) and COM - accommodates PCB layout-induced ground bounce

Applications

Electric Power Steering (EPS)

Common-Rail Diesel Injection

Use Scenario: Driving half-bridge inverter for 3-phase EPS motor with 42 V nominal bus and >600 V transient spikes.

IC Role / Device Role / Timing Role: High-side/low-side gate driver delivering precise, matched timing to prevent shoot-through during torque-assist transitions.

Use Value: 160 ns/200 ns propagation delay and 50 V/ns dV/dt immunity ensure robust commutation under EMI-heavy steering column conditions.

Use Scenario: Controlling solenoid-actuated fuel injector with fast turn-on/turn-off requirements in diesel engine management.

IC Role / Device Role / Timing Role: Dual-channel driver enabling microsecond-level injector pulse width modulation with tight dead-time control via external logic.

Use Value: 1.9 A/2.3 A peak output current reduces gate charge time to <100 ns, supporting precise 0.1 ms fuel metering resolution.

Starter-Alternator Systems

Automotive HVAC Blower Control

Use Scenario: Bidirectional 48 V/12 V starter-generator in-stop-start systems requiring regenerative braking and cranking pulses.

IC Role / Device Role / Timing Role: Half-bridge gate driver managing high-current, high-dV/dt switching across battery reversal events.

Use Value: +600 V VB rating and −5 V to +600 V VS operating range accommodate reverse-polarity and load-dump transients per ISO 7637-2.

Use Scenario: Variable-speed blower motor control in cabin HVAC using 12 V DC bus and PWM-modulated half-bridge.

IC Role / Device Role / Timing Role: Compact SOIC-8 driver providing logic-level interface to MCU and robust gate drive for 30 A MOSFETs.

Use Value: 3.3 V/5 V logic compatibility eliminates level shifters; RoHS + AEC-Q100 qualification ensures long-term reliability in thermal-cycled dash environments.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
IRS21844SPbF	Programmable dead-time (0.4–5 µs), separate VSS pin, 14-lead SOIC	Requires external dead-time generation circuitry; better suited for designs needing adjustable overlap protection	Select when shoot-through margin must be actively tuned - not drop-in for AUIRS2181S layouts
UCC27211D	600 V high-side capability, 4 A source/4 A sink, no integrated UVLO on VB, 8-pin SOIC	Lacks bootstrap-specific protections (e.g., dV/dt immunity spec); requires external UVLO monitoring	Choose for higher peak current needs where system-level fault handling replaces IC-level safeguards

Compared with IRS21844SPbF and UCC27211D, the AUIRS2181S offers tighter timing matching and integrated bootstrap robustness - making it optimal for cost-sensitive, space-constrained automotive half-bridges where fixed dead-time and proven dV/dt resilience are prioritized over programmability or raw current headroom.

Availability

AUIRS2181S is available at Aetrix Electronics and suitable for electric power steering, common-rail diesel injection, and starter-alternator systems requiring stable component supply across automotive production lifecycles.

Supply support for AUIRS2181S 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, and industrial control solutions, with roots in International Rectifier's high-voltage analog expertise.

The AUIRS2181S belongs to Infineon's automotive-grade HVIC gate driver product line, engineered specifically for functional-safety-aware motor control in ASIL-B systems such as EPS and engine management.

FAQ

What is the maximum allowable dV/dt on the VS pin?

The AUIRS2181S is rated for 50 V/ns dV/dt on the VS pin under recommended operating conditions. This specification ensures reliable operation during fast-switching events in half-bridge configurations, such as motor phase-leg commutation or inductive load switching, without false triggering or latch-up. The rating is validated per datasheet test conditions at TJ = 25°C with VCC = 15 V and CL = 1000 pF.

Does the AUIRS2181S support bootstrap operation for the high-side channel?

Yes - the AUIRS2181S is explicitly designed for bootstrap-based high-side drive. The VB pin connects to the bootstrap capacitor, and the VS pin references the switching node, enabling the high-side driver to operate up to +600 V relative to COM. No external level-shifting or isolated supplies are required, and the IC includes dedicated VBS undervoltage lockout to prevent misfiring during capacitor discharge.

How does the AUIRS2181S differ from the AUIRS21814S?

The AUIRS2181S uses an 8-lead SOIC package with COM as the sole ground reference, while the AUIRS21814S uses a 14-lead SOIC with separate VSS and COM pins. The 14-lead version adds logic ground isolation and supports more complex timing schemes, but the 8-lead AUIRS2181S offers smaller footprint and simpler layout - both share identical electrical specs including propagation delay, output current, and voltage ratings.

Is the AUIRS2181S qualified for automotive use?

Yes - the AUIRS2181S is AEC-Q100 qualified (Grade 1: −40°C to +125°C ambient), with full automotive stress testing including HTOL, TC, UHAST, and ESD. It meets ISO/TS 16949 manufacturing requirements and is specified for use in safety-critical subsystems such as electric power steering and fuel injection, with built-in UVLO, dV/dt immunity, and latch-immune HVIC construction.

AUIRS2181S Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: -

Package/Case:: 8-SOIC (0.154", 3.90mm Width)

Packaging:: Tube

Product Status:: Obsolete

Programmable:: Not Verified

Driven Configuration:: Half-Bridge

Channel Type:: Independent

Number of Drivers:: 2

Gate Type:: IGBT, N-Channel MOSFET

Voltage - Supply:: 10V ~ 20V

Logic Voltage - VIL, VIH:: 0.8V, 2.5V

Current - Peak Output (Source, Sink):: 1.9A, 2.3A

Input Type:: Inverting

High Side Voltage - Max (Bootstrap):: 600 V

Rise / Fall Time (Typ):: 15ns, 15ns

Operating Temperature:: -40°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-SOIC

AUIRS2181S FAQ

1.How can I place an order for AUIRS2181S through Aetrix?

Please submit a Request for Quotation (RFQ) for AUIRS2181S on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for AUIRS2181S reliable?

The price and inventory of AUIRS2181S are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AUIRS2181S is usually 5 days.

3.What payment methods are accepted for AUIRS2181S?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AUIRS2181S transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AUIRS2181S?

AUIRS2181S orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AUIRS2181S order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for AUIRS2181S?

For technical support, including AUIRS2181S datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AUIRS2181S requirements.

6.How does Aetrix verify that AUIRS2181S is sourced from the original manufacturer or authorized distributors?

All AUIRS2181S products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AUIRS2181S meets industry standards.

7.What is the process for return or replacement of AUIRS2181S?

All AUIRS2181S units undergo pre-shipment inspection (PSI). If there is an issue with AUIRS2181S, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The AUIRS2181S part is unused and in its original packaging.

Return procedure for AUIRS2181S:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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