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

Infineon Technologies AUIRS2181STR

Name: AUIRS2181STR
Brand: Infineon Technologies
SKU: AUIRS2181STR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AUIRS2181STR

Manufacturer:: Infineon Technologies

Category:: Gate Drivers

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

Datasheet:: AUIRS2181STR.pdf

Description:: IC GATE DRVR HALF-BRIDGE 8SOIC

Quantity:: RFQ Add To RFQ list

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Inventory:2,232

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Product details

Overview

AUIRS2181STR from Infineon Technologies is an automotive-qualified high- and low-side gate driver IC for N-channel MOSFETs and IGBTs, featuring independent floating high-side (up to +600 V) and grounded low-side output channels, 160 ns/200 ns typical propagation delay, 1.9 A source / 2.3 A sink peak output current, and 3.3 V/5 V logic compatibility. It enables robust half-bridge control in electric power steering and common rail injection systems.

For engineers reviewing the AUIRS2181STR datasheet, AUIRS2181STR pinout, AUIRS2181STR application, or AUIRS2181STR equivalent, key selection criteria include its 600 V high-side offset capability, matched channel timing, undervoltage lockout on both supplies, and SOIC-14N package with isolated logic and power grounds.

Technical Context

The AUIRS2181STR integrates a latch-immune HVIC process enabling monolithic high-voltage isolation between the floating high-side channel (VB/VS referenced) and the grounded low-side/logic domain (VCC/VSS/COM referenced). Its dual-channel architecture supports independent HIN/LIN inputs without internal dead-time insertion.

It operates with logic-compatible inputs (VIH ≥ 2.5 V, VIL ≤ 0.8 V) across VCC = 10–20 V and withstands dV/dt transients up to 50 V/ns on VS. The device implements separate undervoltage lockout (UVLO) thresholds (8.9 V typ, 0.7 V hysteresis) for both VCC and bootstrap supply (VBS), ensuring safe turn-off during supply sag.

Key Specifications

Parameter	Value and Actual Design Meaning
Topology	Independent high- and low-side gate driver for N-channel power switches
V_OFFSET (High-side)	600 V max - enables direct drive of high-side MOSFET/IGBT in 400–600 V bus systems
t_ON/t_OFF (typ)	160 ns / 200 ns - ensures precise, matched switching timing for reduced shoot-through risk
I_O+/I_O− (typ)	1.9 A / 2.3 A - delivers fast gate charging/discharging for <100 ns transition times with 1000 pF load
Logic Compatibility	3.3 V and 5 V CMOS/LSTTL - eliminates need for level-shifting in microcontroller interfacing
UVLO Thresholds	VCC/VBS: 8.9 V (typ) with 0.7 V hysteresis - prevents erratic operation during brown-out conditions
Package	14-Lead SOIC Narrow Body (SOIC14N) - provides creepage/clearance compliance for automotive 600 V applications

Pinout & Package

Package: 14-Lead SOIC Narrow Body (SOIC14N), RoHS-compliant, automotive qualified (AEC-Q100 Grade 1).

Pin/Terminal	Circuit Role	Design Meaning
VCC	Low-side and logic supply input	Fixed 10–20 V supply for internal logic and LO driver; referenced to COM
VSS	Logic ground reference	Separate logic ground pin; allows ±5 V offset vs. COM for noise immunity
COM	Power ground reference	Return path for LO output and bootstrap capacitor discharge; tied to system power ground
HIN	High-side input signal	CMOS/LSTTL-compatible digital input controlling HO output; referenced to VSS
LIN	Low-side input signal	CMOS/LSTTL-compatible digital input controlling LO output; referenced to VSS
HO	High-side floating output	Drives gate of high-side N-MOSFET/IGBT; referenced to VS; capable of +600 V offset
LO	Low-side grounded output	Drives gate of low-side N-MOSFET/IGBT; referenced to COM; 2.3 A sink capability
VB	Bootstrap high-side supply input	Connects to bootstrap capacitor top; supplies floating driver stage for HO
VS	High-side floating supply return	Reference node for VB and HO; tracks switching node voltage up to +600 V

Key Features

Feature	Design Value
Floating channel with dV/dt immunity	Withstands 50 V/ns transient on VS - suppresses false triggering in noisy high-di/dt motor drives
Matched propagation delay	≤35 ns skew between HO/LO channels - enables precise synchronous half-bridge switching
Dual UVLO protection	Independent 8.9 V (typ) lockout on VCC and VBS - guarantees safe disable when either supply drops
Lower di/dt gate driver	Optimized output stage slew rate - reduces EMI generation during gate transitions
Automotive qualification	AEC-Q100 Grade 1 (−40 °C to +125 °C ambient) - validated for under-hood EPS and starter-alternator systems

Applications

Piezo Fuel Injector Driver

Electric Power Steering (EPS)

Use Scenario: Driving high-speed piezoelectric actuators in diesel common rail injection systems requiring sub-microsecond timing precision and 600 V blocking capability.

IC Role / Device Role / Timing Role: High- and low-side gate driver controlling series-connected N-channel MOSFETs that switch the piezo stack voltage with matched 160/200 ns delays.

Use Value: Enables <1 µs total propagation uncertainty, critical for accurate fuel metering and combustion timing at 20 kHz+ switching frequencies.

Use Scenario: Controlling three-phase inverter bridge in 12 V or 48 V EPS motor drives where compact size, thermal robustness, and functional safety are mandatory.

IC Role / Device Role / Timing Role: Dual-channel gate driver providing isolated high-side and grounded low-side outputs per phase leg, with separate VSS/COM grounding for EMC resilience.

Use Value: Delivers 1.9 A/2.3 A peak drive current to minimize MOSFET conduction losses while maintaining AEC-Q100 Grade 1 reliability over full temperature range.

Starter-Alternator Inverter

Fan and Compressor Drive

Use Scenario: Bidirectional 48 V/12 V starter-generator in mild hybrid vehicles, operating with high bus voltage transients and demanding thermal cycling.

IC Role / Device Role / Timing Role: Half-bridge driver managing high-side and low-side switches in buck-boost converter topology; leverages 600 V offset tolerance for transient overvoltage margin.

Use Value: Survives 50 V/ns dV/dt events during load dump, eliminating external snubbers and reducing BOM count in space-constrained engine bay modules.

Use Scenario: Variable-speed HVAC blower and refrigerant compressor control in automotive cabin systems requiring low acoustic noise and high efficiency.

IC Role / Device Role / Timing Role: Gate driver for 600 V-class MOSFETs in inverter stages, using matched t_ON/t_OFF to minimize dead-time distortion and torque ripple.

Use Value: Reduces audible PWM noise by >8 dB through precise 35 ns channel matching and controlled gate slew rates.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
IRS21844STR	Includes programmable dead-time (0.4–5 µs) and SD shutdown pin; higher t_ON/t_OFF (600/230 ns)	Targeted at applications requiring fault-containment via external dead-time control and enable/disable sequencing	Select when system-level shoot-through prevention mandates configurable blanking, not inherent channel independence
UCC27211D	600 V high-side rating but single-input (IN/EN), no VSS pin; lower source/sink (4 A/4 A); no integrated UVLO on bootstrap	Suited for simpler half-bridge topologies where logic ground separation and dual UVLO are non-critical	Choose for cost-sensitive industrial inverters where AEC-Q100 is not required and layout allows shared ground

Compared with IRS21844STR and UCC27211D, the AUIRS2181STR uniquely combines automotive qualification, matched timing, dual UVLO, and isolated VSS/COM grounding-making it optimal for safety-critical, noise-sensitive EPS and injector systems where deterministic behavior under transients is non-negotiable.

Availability

AUIRS2181STR is available at Aetrix Electronics and suitable for electric power steering, piezo fuel injection, and starter-alternator inverter designs requiring stable component supply, automotive-grade reliability, and SOIC-14N packaging.

Supply support for AUIRS2181STR 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-voltage IC design and automotive qualification.

The AUIRS2181STR belongs to Infineon's automotive-grade high- and low-side driver product line, engineered specifically for robust half-bridge gate driving in safety-critical vehicle subsystems such as EPS, injection, and 48 V mild hybrid systems.

FAQ

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

The AUIRS2181STR 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 motor drives and inverters without false triggering of the high-side driver stage. Testing confirms immunity up to this rate across −40 °C to +125 °C ambient temperature.

Does the AUIRS2181STR require external bootstrap diode and capacitor?

Yes - the AUIRS2181STR requires an external bootstrap diode and capacitor connected between VB and VS to supply the floating high-side driver stage. A typical configuration uses a 10–22 nF ceramic capacitor and a fast-recovery Schottky diode rated for ≥20 V reverse voltage and ≥100 mA average current.

How does the VSS pin differ from COM, and why are they separate?

VSS is the dedicated logic ground reference for HIN/LIN inputs and internal circuitry, while COM is the power ground return for LO output and bootstrap capacitor discharge. Their separation allows ±5 V offset tolerance between logic and power domains, improving noise immunity in high-di/dt automotive environments where ground bounce is prevalent.

Can the AUIRS2181STR drive IGBTs directly without external components?

Yes - the AUIRS2181STR can directly drive standard 600 V IGBTs with gate-emitter voltages up to 20 V, leveraging its 1.9 A source / 2.3 A sink capability and 600 V high-side offset. No external gate resistors are required for basic operation, though layout-optimized gate resistors are recommended to control EMI and ringing in production designs.

AUIRS2181STR Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: -

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

Packaging:: Tape & Reel (TR)

Product Status:: Not For New Designs

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

AUIRS2181STR FAQ

1.How can I place an order for AUIRS2181STR through Aetrix?

Please submit a Request for Quotation (RFQ) for AUIRS2181STR 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 AUIRS2181STR reliable?

The price and inventory of AUIRS2181STR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AUIRS2181STR is usually 5 days.

3.What payment methods are accepted for AUIRS2181STR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AUIRS2181STR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AUIRS2181STR?

AUIRS2181STR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AUIRS2181STR 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 AUIRS2181STR?

For technical support, including AUIRS2181STR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AUIRS2181STR requirements.

6.How does Aetrix verify that AUIRS2181STR is sourced from the original manufacturer or authorized distributors?

All AUIRS2181STR 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 AUIRS2181STR meets industry standards.

7.What is the process for return or replacement of AUIRS2181STR?

All AUIRS2181STR units undergo pre-shipment inspection (PSI). If there is an issue with AUIRS2181STR, 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 AUIRS2181STR part is unused and in its original packaging.

Return procedure for AUIRS2181STR:

1.Submit a request within 90 days.

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

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