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

Infineon Technologies AUIRS21814STR

Name: AUIRS21814STR
Brand: Infineon Technologies
SKU: AUIRS21814STR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AUIRS21814STR

Manufacturer:: Infineon Technologies

Category:: Gate Drivers

Package:: 14-SOIC (0.154", 3.90mm Width)

Datasheet:: AUIRS21814STR.pdf

Description:: IC GATE DRVR HALF-BRIDGE 14SOIC

Quantity:: RFQ Add To RFQ list

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Inventory:4,553

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Product details

Overview

AUIRS21814STR 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, 1.9 A source / 2.3 A sink peak output current, 160 ns turn-on / 200 ns turn-off propagation delay, and 3.3 V/5 V logic-compatible inputs. It enables robust half-bridge control in electric power steering and piezo fuel injection systems.

For engineers reviewing the AUIRS21814STR datasheet, AUIRS21814STR pinout, AUIRS21814STR application, or AUIRS21814STR equivalent, key selection criteria include high-side voltage tolerance (600 V), matched channel delays, dual UVLO protection, SOIC-14N package thermal resistance (120 °C/W), and automotive-grade qualification per AEC-Q100.

Technical Context

The AUIRS21814STR integrates a latch-immune HVIC process with CMOS logic to support simultaneous high-side floating operation (VB up to +625 V absolute, VS offset up to 600 V) and low-side referenced drive. Its input stage accepts 3.3 V or 5 V logic signals with VIH ≥ 2.5 V and VIL ≤ 0.8 V, while internal clamps limit VCC and VB supply voltages to 20 V.

Propagation delays are tightly matched between high- and low-side channels (≤35 ns mismatch), and undervoltage lockout (UVLO) triggers at 8.2 V (falling) and 8.9 V (rising) on both VCC and VB supplies, with 0.7 V hysteresis. The device lacks programmable dead time-unlike AUIRS21834/AUIRS21844-but uses fixed internal timing.

Key Specifications

Parameter	Value and Actual Design Meaning
Topology	Independent high- and low-side gate driver for N-MOSFET/IGBT half-bridges
V_OFFSET (max)	600 V - supports high-side switching in 400–600 V DC bus systems
I_O+/I_O− (typ)	1.9 A / 2.3 A - drives gate capacitance of >10 nF MOSFETs at <100 ns edge rates
t_ON/t_OFF (typ)	160 ns / 200 ns - enables PWM operation up to ~2 MHz with margin
Logic Compatibility	3.3 V & 5 V CMOS/LSTTL - interfaces directly with MCU GPIO without level shifters
UVLO Thresholds	V_CC/V_BS: 8.2 V (falling), 8.9 V (rising) - prevents partial turn-on during brownout
R_thJA	120 °C/W (SOIC-14N) - limits junction rise to ≤120 °C at 1.0 W dissipation in still air

Pinout & Package

AUIRS21814STR is housed in a 14-lead narrow-body SOIC (SOIC-14N) package with exposed thermal pad (not internally connected), rated for automotive temperature range (−40 °C to +125 °C).

Pin/Terminal	Circuit Role	Design Meaning
V_CC	Low-side and logic supply input	10–20 V rail powering internal logic and LO driver; clamped at 20 V
V_SS	Logic ground reference	Separate ground pin for noise isolation; tolerant of ±5 V offset vs. COM
HIN	High-side input signal	CMOS-compatible digital input controlling HO output; VIH ≥ 2.5 V, VIL ≤ 0.8 V
LIN	Low-side input signal	CMOS-compatible digital input controlling LO output; referenced to V_SS
COM	Power ground / return for LO and bootstrap circuit	Common return for low-side output and bootstrap diode/capacitor network
HO	High-side gate drive output	Floating output referenced to VS; drives gate of high-side N-MOSFET/IGBT
LO	Low-side gate drive output	Ground-referenced output; sinks/source up to 2.3 A/1.9 A into gate load
V_B	Bootstrap high-side supply input	Connects to bootstrap capacitor; supplies floating logic and HO driver (10–20 V)
V_S	High-side floating supply return	Reference node for HO output; swings with high-side switch source (up to 600 V dV/dt immune)

Key Features

Feature	Design Value
Floating channel architecture	Enables high-side drive up to +600 V with dV/dt immunity (>50 V/ns), eliminating need for isolated supplies
Matched propagation delay	≤35 ns skew between HO and LO ensures precise half-bridge timing and minimizes shoot-through risk
Dual independent UVLO	Separate undervoltage lockout on VCC and VB supplies prevents erratic switching during supply sag or bootstrap depletion
Lower di/dt gate drive	Optimized output stage reduces EMI generation and improves noise immunity in high-noise motor control environments
Automotive qualification	AEC-Q100 Grade 1 qualified (−40 °C to +125 °C), with enhanced ESD protection and production traceability

Applications

Piezo Fuel Injector Driver

Electric Power Steering (EPS)

Use Scenario: Driving high-voltage piezoelectric actuators in diesel common-rail injection systems requiring fast, precise voltage slew rates.

IC Role / Device Role / Timing Role: High-side gate driver for stacked MOSFET half-bridge; delivers 160 ns turn-on to achieve sub-millisecond injector actuation.

Use Value: 600 V offset tolerance and dV/dt immunity ensure reliable operation despite 400 V rail transients and engine compartment noise.

Use Scenario: Controlling three-phase inverter bridge in 12 V or 48 V EPS motor drives with torque ripple minimization requirements.

IC Role / Device Role / Timing Role: Dual-channel gate driver enabling synchronous PWM for field-oriented control; matched delays reduce current distortion.

Use Value: 1.9 A/2.3 A peak drive current supports fast gate charging of low-R_DS(on) MOSFETs, improving efficiency and thermal margin.

Starter-Alternator System

Fan & Compressor Inverter

Use Scenario: Bidirectional 48 V/12 V starter-generator control where regenerative braking demands precise high-side switching.

IC Role / Device Role / Timing Role: High- and low-side driver for buck-boost converter stage; UVLO prevents MOSFET partial turn-on during battery voltage dip.

Use Value: Independent VSS and COM pins allow clean separation of logic and power grounds, reducing gate drive loop noise in high-current paths.

Use Scenario: Variable-speed HVAC fan or refrigerant compressor drive operating from 24–48 V DC bus with EMC constraints.

IC Role / Device Role / Timing Role: Gate driver for half-bridge output stage; lower di/dt output stage meets CISPR-25 Class 5 radiated emissions limits.

Use Value: SOIC-14N package with 120 °C/W R_thJA sustains continuous 1.0 W dissipation without heatsink in compact under-hood layouts.

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
IRS21844SPBF	Programmable dead time (0.4–5 µs); no VSS pin; SOIC-14 standard body	Requires external dead-time configuration; less suitable for space-constrained automotive PCBs	Select when precise dead-time tuning is required and layout allows larger footprint
UCC27211D	600 V high-side rating; 4 A peak drive; no integrated UVLO on VB; SOIC-8	Lacks dual UVLO and automotive qualification; higher drive strength but reduced fault protection	Select for non-automotive industrial inverters needing higher current, accepting external UVLO design

Compared with IRS21844SPBF and UCC27211D, the AUIRS21814STR uniquely combines AEC-Q100 qualification, separate VSS/COM grounding, fixed low-skew timing, and dual UVLO in a narrow-body SOIC-making it optimal for safety-critical, space-limited automotive half-bridge designs.

Availability

AUIRS21814STR is available at Aetrix Electronics and suitable for electric power steering, piezo fuel injection, starter-alternator systems, and HVAC fan/compressor inverters requiring stable component supply across automotive production lifecycles.

Supply support for AUIRS21814STR 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 global manufacturing and automotive certification infrastructure.

The AUIRS21814STR belongs to Infineon's automotive-grade high-voltage gate driver product line, engineered specifically for functional-safety-aware motor control in xEV and chassis systems.

FAQ

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

The AUIRS21814STR is rated for 50 V/ns dV/dt immunity at the VS pin, verified per datasheet Absolute Maximum Ratings. This enables reliable operation during fast-switching events in 400–600 V bus systems without false triggering or latch-up, even with parasitic coupling in high-power PCB layouts.

Does AUIRS21814STR require external bootstrap diode and capacitor?

Yes - the AUIRS21814STR requires an external bootstrap diode and capacitor connected between V_B and VS to generate the floating high-side supply. A typical design uses a 10–22 µF ceramic capacitor and fast-recovery Schottky diode (e.g., RB055LAM-40), sized to maintain >10 V on V_B during worst-case duty cycle and switching frequency.

Can HIN and LIN be driven by the same PWM signal?

No - driving HIN and LIN with identical signals causes simultaneous high- and low-side conduction, risking shoot-through. The AUIRS21814STR expects complementary, dead-time-integrated inputs. External logic or MCU firmware must enforce non-overlapping timing; the device itself provides no internal dead time.

Is the VSS pin internally connected to COM?

No - VSS and COM are electrically isolated pins. VSS serves as logic ground reference for HIN/LIN inputs and internal logic, while COM is the power return path for LO and the bootstrap circuit. Separating them reduces noise coupling from high-current switching into sensitive logic inputs, a key requirement in automotive EMC design.

AUIRS21814STR Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: -

Package/Case:: 14-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:: 14-SOIC

AUIRS21814STR FAQ

1.How can I place an order for AUIRS21814STR through Aetrix?

Please submit a Request for Quotation (RFQ) for AUIRS21814STR 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 AUIRS21814STR reliable?

The price and inventory of AUIRS21814STR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AUIRS21814STR is usually 5 days.

3.What payment methods are accepted for AUIRS21814STR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AUIRS21814STR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AUIRS21814STR?

AUIRS21814STR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AUIRS21814STR 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 AUIRS21814STR?

For technical support, including AUIRS21814STR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AUIRS21814STR requirements.

6.How does Aetrix verify that AUIRS21814STR is sourced from the original manufacturer or authorized distributors?

All AUIRS21814STR 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 AUIRS21814STR meets industry standards.

7.What is the process for return or replacement of AUIRS21814STR?

All AUIRS21814STR units undergo pre-shipment inspection (PSI). If there is an issue with AUIRS21814STR, 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 AUIRS21814STR part is unused and in its original packaging.

Return procedure for AUIRS21814STR:

1.Submit a request within 90 days.

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

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