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

Infineon Technologies AUIR3241STR

Name: AUIR3241STR
Brand: Infineon Technologies
SKU: AUIR3241STR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AUIR3241STR

Manufacturer:: Infineon Technologies

Category:: Gate Drivers

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

Datasheet:: AUIR3241STR.pdf

Description:: IC GATE DRVR HIGH-SIDE 8SO

Quantity:: RFQ Add To RFQ list

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Product details

Overview

AUIR3241STR from Infineon Technologies is an automotive-grade high-side MOSFET gate driver IC for back-to-back switch topologies, integrating a boost DC/DC converter with internal diode, 3–36 V wide input range, <6 µA typical quiescent current in off-state at 25°C, and 11.5 V minimum gate drive voltage-used in battery disconnect and stop-start system power switches.

For engineers reviewing the AUIR3241STR datasheet, AUIR3241STR pinout, AUIR3241STR application, or AUIR3241STR equivalent, key selection criteria include its low-quiescent-current operation across temperature, integrated UVLO with diagnostic latch, ground-loss protection, and compatibility with standard-level MOSFETs down to 3 V supply.

Technical Context

The AUIR3241STR implements a current-mode boost converter driving an external 100 µH inductor to generate a regulated gate drive voltage (Vout ≥ 11.5 V) independent of input rail, enabling reliable MOSFET turn-on even during cranking (≥3 V). Its internal K1/K2/K3 switch matrix controls back-to-back MOSFET conduction and safe gate discharge.

UVLO triggers at 6.5–10 V (Vout–Vcc), latches until reset via Vout–Vcc drop below threshold, and provides diagnostic current (10–40 mA) for fault detection. Input is active-high, 3.3 V compatible, with dedicated RS pin for current-sense thresholding at 0.8–1.3 V.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	3–36 V: Supports full automotive battery range including cold-crank (3 V) and load-dump (36 V)
I_Q Off (25°C)	≤6 µA: Enables ultra-low-power battery disconnect with minimal parasitic drain
V_GATE Min	11.5 V: Ensures robust enhancement-mode MOSFET turn-on at low V_BAT
UVLO Threshold	6.5–10 V (V_OUT–V_CC): Prevents linear-mode operation and thermal runaway
R_DS(on) K1	8–20 Ω (–40 to 125°C): Limits conduction loss in integrated high-side switch path
T_OFF	2–4 µs: Enables fast, controlled turn-off for transient-safe power switching
V_RS Threshold	0.8–1.3 V: Sets precise overcurrent trip point for battery short-circuit protection

Pinout & Package

Package: SOIC-8 (SO8), RoHS-compliant, lead-free, surface-mount.

Pin/Terminal	Circuit Role	Design Meaning
1 IN	Active-high enable input	Drives gate driver stage; logic-compatible with 3.3 V microcontrollers
2 GND	Power and signal reference	Common return for all internal circuits and external current sense
3 RS	Current-sense input	Detects MOSFET source current via external shunt; trips at 0.8–1.3 V
4 SW	K1 switch output	Connects to external inductor; forms boost converter switching node
5 Source	MOSFET source connection	Direct tie to back-to-back MOSFET source terminals for common-source topology
6 Gate	Gate drive output	Delivers regulated V_OUT to MOSFET gate; drives standard-level devices
7 V_CC	Main supply input	Accepts 3–36 V battery rail; powers internal logic and bias circuitry
8 Out	Boost converter output	Provides stabilized gate drive voltage (≥11.5 V); powers Gate and K1/K2/K3

Key Features

Feature	Design Value
Integrated boost converter + diode	Eliminates need for external flyback diode and reduces BOM count by one component
Ground-loss protection	Continues safe operation even if GND connection degrades-critical for chassis-grounded automotive systems
UVLO with diagnostic latch	Generates measurable 10–40 mA fault current on V_OUT–V_CC, enabling ECU-level fault logging
Back-to-back MOSFET control	Supports bidirectional blocking via K1/K2/K3 sequencing-enables true battery isolation
Low I_Q in both states	≤6 µA off / ≤6 µA on ensures <1 mAh/year standby drain-meets ISO 16750-2 quiescent current limits

Applications

Stop-Start System Power Switch

Battery Disconnect Switch

Use Scenario: Controls main battery feed to vehicle electronics during engine stop to prevent deep discharge.

IC Role / Device Role / Timing Role: High-side gate driver with integrated boost and UVLO, enabling MOSFET turn-on at cranking voltage (3–6 V).

Use Value: Maintains <6 µA off-state current while delivering 11.5 V gate drive-ensures reliable restart after extended stop.

Use Scenario: Isolates auxiliary battery from main system during fault or service mode.

IC Role / Device Role / Timing Role: Back-to-back MOSFET controller with RS-based overcurrent shutdown and ground-loss resilience.

Use Value: Detects >100 A faults via 1 mΩ shunt (0.8 V threshold) and latches safely without GND dependency.

Body Control Module Load Switch

12 V Net Stabilizer

Use Scenario: Powers infotainment, lighting, and comfort modules with controlled inrush and fault response.

IC Role / Device Role / Timing Role: Gate driver with 2–4 µs T_OFF and 0.5–3 µs T_DON for precise PWM-controlled load ramping.

Use Value: Limits inrush dI/dt via controlled gate slew (6–15 ns rise/fall), reducing EMI and contact arcing.

Use Scenario: Stabilizes 12 V board net against voltage sag during high-current actuator activation.

IC Role / Device Role / Timing Role: Boost-regulated gate driver maintaining ≥11.5 V gate voltage despite V_BAT dropping to 3 V.

Use Value: Prevents MOSFET linear-mode conduction during cranking-eliminates thermal stress and voltage droop.

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-side back-to-back MOSFET driver applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
TPS4H160-Q1	Higher V_IN max (40 V), no integrated boost; requires external gate supply	Lacks self-contained gate boosting-needs external 12 V rail or charge pump	Preferred when system already provides stable 12 V gate supply and higher voltage margin is critical
LM74700-Q1	No integrated MOSFET switches; standalone ideal diode controller with reverse polarity protection	Does not support back-to-back topology or current sensing-only forward-direction OR-ing	Selected for simple battery OR-ing, not for bidirectional isolation or RS-based overcurrent protection

Compared with TPS4H160-Q1 and LM74700-Q1, the AUIR3241STR uniquely integrates boost conversion, three internal switches (K1/K2/K3), and RS-based current sensing-making it the only solution that enables fully autonomous, low-V_BAT back-to-back switching without auxiliary supplies or external diodes.

Availability

AUIR3241STR is available at Aetrix Electronics and suitable for stop-start systems, battery disconnect modules, body control units, and 12 V net stabilizers requiring stable component supply under automotive AEC-Q100 Grade 1 qualification.

Supply support for AUIR3241STR 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, and industrial control ICs, with leadership in high-reliability automotive-grade silicon.

The AUIR3241STR belongs to Infineon's automotive high-side driver product line, designed specifically for energy-efficient, fault-resilient battery switching in start-stop, power distribution, and load protection systems.

FAQ

What external components are required for basic AUIR3241STR operation?

The AUIR3241STR requires an external 100 µH inductor between SW and OUT pins, a 100 µF output capacitor on OUT, a current-sense resistor on RS, and a gate resistor (≥100 Ω) between Gate and MOSFET gate. No external diode is needed-the boost rectifier is integrated.

How does the AUIR3241STR handle ground disconnection events?

It features built-in ground-loss protection: internal bias generation remains functional even if GND pin loses connection, allowing continued monitoring of V_CC, V_OUT, and RS signals-enabling safe shutdown without false triggering.

Can the AUIR3241STR drive two MOSFETs in series for bidirectional blocking?

Yes-it is explicitly designed for back-to-back MOSFET configurations. Pin 5 (Source) connects to the common source node, while Gate (pin 6) drives the gate of the high-side MOSFET; the low-side MOSFET gate is driven separately or tied to Source depending on topology.

What is the purpose of the UVLO latch current on the VOUT–VCC node?

The 10–40 mA UVLO latch current flows between VOUT and VCC when undervoltage is detected, providing a measurable, ECU-readable fault signature-enabling diagnostics without additional sensors or communication lines.

AUIR3241STR Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: -

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

Packaging:: Tape & Reel (TR)

Product Status:: Active

Programmable:: Not Verified

Driven Configuration:: High-Side

Channel Type:: Single

Number of Drivers:: 1

Gate Type:: N-Channel MOSFET

Voltage - Supply:: 3V ~ 36V

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

Current - Peak Output (Source, Sink):: 350mA, 350mA

Input Type:: Non-Inverting

High Side Voltage - Max (Bootstrap):: -

Rise / Fall Time (Typ):: 6µs, 6µs

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

Grade:: Automotive

Qualification:: AEC-Q100

Mounting Type:: Surface Mount

Supplier Device Package:: PG-DSO-8-903

AUIR3241STR FAQ

1.How can I place an order for AUIR3241STR through Aetrix?

Please submit a Request for Quotation (RFQ) for AUIR3241STR 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 AUIR3241STR reliable?

The price and inventory of AUIR3241STR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AUIR3241STR is usually 5 days.

3.What payment methods are accepted for AUIR3241STR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AUIR3241STR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AUIR3241STR?

AUIR3241STR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AUIR3241STR 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 AUIR3241STR?

For technical support, including AUIR3241STR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AUIR3241STR requirements.

6.How does Aetrix verify that AUIR3241STR is sourced from the original manufacturer or authorized distributors?

All AUIR3241STR 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 AUIR3241STR meets industry standards.

7.What is the process for return or replacement of AUIR3241STR?

All AUIR3241STR units undergo pre-shipment inspection (PSI). If there is an issue with AUIR3241STR, 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 AUIR3241STR part is unused and in its original packaging.

Return procedure for AUIR3241STR:

1.Submit a request within 90 days.

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

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