Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

Home > Products > Discrete Semiconductor Products > Transistors > FETs, MOSFETs > FETs, MOSFETs

Infineon Technologies AUIRFSA8409-7TRL

Name: AUIRFSA8409-7TRL
Brand: Infineon Technologies
SKU: AUIRFSA8409-7TRL
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: AUIRFSA8409-7TRL

Manufacturer:: Infineon Technologies

Category:: FETs, MOSFETs

Package:: TO-263-7, D2PAK (6 Leads + Tab)

Datasheet:: AUIRFSA8409-7TRL.pdf

Description:: MOSFET N-CH 40V 523A D2PAK

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:1,471

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

AUIRFSA8409-7TRL from Infineon is an automotive-grade N-channel HEXFET® Power MOSFET in D2PAK-7TP package, rated for 40 V V_DSS, 0.50 mΩ typ. R_DS(on) at V_GS = 10 V, and 360 A continuous drain current (package-limited), designed for high-current DC-DC conversion and battery switching in electric power steering systems.

For engineers reviewing the AUIRFSA8409-7TRL datasheet, AUIRFSA8409-7TRL pinout, AUIRFSA8409-7TRL application, or AUIRFSA8409-7TRL equivalent, key selection criteria include its 175°C junction rating, 1440 A pulsed drain capability, low C_oss (2140 pF), fast switching (t_r = 94 ns), and qualified repetitive avalanche performance up to T_Jmax.

Technical Context

This MOSFET employs advanced silicon processing to achieve ultra-low on-resistance per die area while maintaining robust thermal performance under high-current automotive transients. Its gate charge profile (Q_g = 305 nC typ.) and Miller charge (Q_gd = 96 nC) support efficient high-frequency synchronous rectification in 48 V–12 V bidirectional DC-DC converters.

The device integrates a fast-recovery body diode with t_rr = 59 ns (T_J = 25°C), Q_rr = 96 nC, and dv/dt ruggedness up to 3.1 V/ns at 175°C - enabling reliable operation in hard-switched inductive loads without external freewheeling diodes.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DSS	40 V - Maximum blocking voltage for 48 V automotive bus protection and load switching.
R_DS(on) typ.	0.50 mΩ at V_GS = 10 V, I_D = 100 A - Enables <1.0 W conduction loss at 100 A, critical for EPS motor drive efficiency.
I_D (Package Limited)	360 A at T_C = 25°C - Defined by bond-wire current capacity, not silicon limit; sets PCB layout copper requirement.
E_AS (Single Pulse)	743 mJ (L = 0.15 mH, I_AS = 100 A) - Supports unclamped inductive turn-off in battery disconnect circuits without snubbers.
t_r/t_f	94 ns / 90 ns at I_D = 100 A - Enables >100 kHz switching in high-power DC-DC stages with minimal switching loss.
T_J Operating Range	−55°C to +175°C - Qualified for under-hood placement in start-stop micro-hybrid control modules.
Q_g	305 nC typ. - Determines gate driver peak current demand (≥3 A for 100 ns rise time) in high-side synchronous buck designs.

Pinout & Package

Supplied in D2PAK-7TP (TO-263-7) thermally enhanced surface-mount package with exposed drain pad and 7 terminals: three parallel source pins (S1–S3), one gate (G), one drain (D), and two Kelvin source (KS) and Kelvin gate (KG) sense pins for closed-loop R_DS(on) monitoring and gate drive stability.

Pin/Terminal	Circuit Role	Design Meaning
G	Main gate input	Drives channel conduction; requires low-inductance routing to minimize ringing during 100+ A switching transitions.
D	Main drain connection	High-current output node tied to PCB thermal pad; carries full load current and avalanche energy return path.
S1–S3	Parallel source outputs	Shared return path for 360 A continuous current; must be routed with ≥3 oz Cu and thermal vias to inner ground planes.
KS	Kelvin source sense	Provides remote sensing of source potential to eliminate IR drop error in current measurement and gate drive feedback loops.
KG	Kelvin gate sense	Enables accurate gate-to-source voltage regulation independent of power loop inductance, critical for stable 10 V drive at high dI/dt.

Key Features

Feature	Design Value
175°C Junction Rating	Allows direct mounting on engine-compartment PCBs without derating in EPS control units operating at ambient >105°C.
Repetitive Avalanche Rated	Validated for unlimited repetitive unclamped inductive switching up to E_AR = 1450 mJ (T_J = 25°C), eliminating need for external clamping diodes in battery isolation FETs.
Ultra-Low R_DS(on)	0.50 mΩ typ. reduces conduction loss by >40% vs. prior-gen 40 V automotive MOSFETs, directly improving system efficiency in 5–10 kW DC-DC stages.
Fast Body Diode Recovery	t_rr = 59 ns and Q_rr = 96 nC enable zero-voltage switching (ZVS) assist in half-bridge topologies without reverse recovery oscillation.
Lead-Free & RoHS Compliant	Meets automotive ELV Directive and JESD204B reflow profile (peak 260°C), supporting lead-free manufacturing for Tier-1 suppliers.

Applications

Electric Power Steering (EPS)

Battery Disconnect Switch

Use Scenario: High-current motor phase switching in column-assist EPS modules requiring 300+ A peak current handling and ASIL-B functional safety compliance.

IC Role / Device Role / Timing Role: Main power switch in three-phase inverter bridge; operates in PWM mode at 10–20 kHz with precise dead-time control.

Use Value: 0.50 mΩ R_DS(on) limits temperature rise to <45°C above case at 300 A, enabling compact heatsink design and reducing thermal stress on adjacent MCU.

Use Scenario: Isolation of 12 V/48 V dual-battery systems during engine cranking or fault conditions in micro-hybrid vehicles.

IC Role / Device Role / Timing Role: Single-pole, high-side load switch controlled via isolated gate driver; subjected to repeated unclamped inductive turn-off events.

Use Value: 743 mJ single-pulse avalanche energy rating allows safe interruption of 300 A inductive currents without external snubbers, reducing BOM count and board space.

Start/Stop Micro-Hybrid DC-DC

Heavy-Duty DC Motor Drive

Use Scenario: Bidirectional 48 V ↔ 12 V DC-DC converter in mild hybrid architectures, delivering up to 5 kW continuous power with >96% efficiency.

IC Role / Device Role / Timing Role: Synchronous rectifier in secondary-side LLC resonant stage; commutates at 300–500 kHz with zero-voltage turn-on.

Use Value: Low C_oss (2140 pF) and fast t_r/t_f reduce switching losses by 22% vs. standard 40 V MOSFETs, directly increasing converter efficiency at light load.

Use Scenario: High-torque actuator control in commercial vehicle air suspension compressors and hydraulic pump drivers.

IC Role / Device Role / Timing Role: Low-side switch in H-bridge configuration driving brushed DC motors with 200–400 A stall currents.

Use Value: 1440 A pulsed drain rating supports 5× stall current surges without bond-wire fusing, ensuring reliability during cold-start motor engagement.

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-current 40 V automotive MOSFET applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
STL220N4LF8AG	R_DS(on) = 0.45 mΩ typ., but only 300 A package-limited ID and no Kelvin sense pins.	Lacks KS/KG terminals; unsuitable for precision current sensing or high-dI/dt gate drive stability in EPS inverters.	Select when cost sensitivity outweighs need for Kelvin sensing and higher pulse current headroom.
IPB180N04S4-02	R_DS(on) = 0.52 mΩ, 175°C rated, but only 200 A package-limited ID and no repetitive avalanche validation.	Not qualified for unclamped inductive switching; requires external avalanche clamp in battery disconnect use cases.	Prefer for lower-current DC-DC stages where avalanche robustness is not required and footprint compatibility is critical.

Compared with STL220N4LF8AG and IPB180N04S4-02, AUIRFSA8409-7TRL uniquely combines 360 A package-limited current, Kelvin sensing, and validated repetitive avalanche - making it the only option qualified for ASIL-B-compliant EPS inverter bridges and high-reliability battery isolation switches.

Availability

AUIRFSA8409-7TRL is available at Aetrix Electronics and suitable for Electric Power Steering (EPS), Battery Disconnect Switch, and Start/Stop Micro-Hybrid DC-DC applications requiring stable component supply across automotive production lifecycles.

Supply support for AUIRFSA8409-7TRL 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 R&D and wafer fabrication facilities.

AUIRFSA8409-7TRL belongs to Infineon's automotive-qualified HEXFET® Power MOSFET product line, engineered specifically for high-efficiency, high-reliability power conversion in demanding under-hood environments including EPS, battery management, and 48 V micro-hybrid systems.

FAQ

What is the maximum continuous drain current for AUIRFSA8409-7TRL at 100°C case temperature?

The maximum continuous drain current is 370 A (silicon-limited) at T_C = 100°C and V_GS = 10 V. However, the package-limited rating remains 360 A at T_C = 25°C and decreases linearly with case temperature due to thermal resistance constraints - actual usable current at 100°C is governed by PCB thermal design and must stay within the 2.5 W/°C derating curve.

Does AUIRFSA8409-7TRL support Kelvin source and gate sensing, and how are they used?

Yes - the D2PAK-7TP package includes dedicated KS (Kelvin Source) and KG (Kelvin Gate) terminals. KS provides a low-noise reference for current-sense amplifiers, eliminating voltage drop errors from high-current source paths. KG enables precise gate-to-source voltage regulation by feeding back the true V_GS at the die edge, critical for stable switching at >100 A/µs dI/dt in EPS inverters.

What is the significance of the 1440 A pulsed drain current rating?

The 1440 A rating reflects the device's bond-wire surge capability under short-duration pulses (≤400 µs, ≤2% duty cycle). It defines the absolute peak current the MOSFET can handle during motor stall, cranking transients, or fault conditions without metallization failure - a key parameter for sizing overcurrent protection in automotive battery switches and EPS motor drives.

How does the repetitive avalanche rating impact system design?

The device is validated for unlimited repetitive avalanche events up to 1450 mJ (at T_J = 25°C), meaning it can safely absorb inductive energy during repeated unclamped turn-off without external clamping components. This simplifies circuit design in battery disconnect switches and eliminates snubber losses, improving overall system efficiency and reliability in ASIL-B applications.

AUIRFSA8409-7TRL Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: HEXFET®

Package/Case:: TO-263-7, D2PAK (6 Leads + Tab)

Packaging:: Tape & Reel (TR)

Product Status:: Active

FET Type:: N-Channel

Technology:: MOSFET (Metal Oxide)

Drain to Source Voltage (Vdss):: 40 V

Current - Continuous Drain (Id) @ 25°C:: 523A (Tc)

Drive Voltage (Max Rds On, Min Rds On):: 10V

Rds On (Max) @ Id, Vgs:: 0.69mOhm @ 100A, 10V

Vgs(th) (Max) @ Id:: 3.9V @ 250µA

Gate Charge (Qg) (Max) @ Vgs:: 460 nC @ 10 V

Vgs (Max):: ±20V

Input Capacitance (Ciss) (Max) @ Vds:: 13975 pF @ 25 V

FET Feature:: -

Power Dissipation (Max):: 375W (Tc)

Operating Temperature:: -55°C ~ 175°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: PG-TO263-7

AUIRFSA8409-7TRL FAQ

1.How can I place an order for AUIRFSA8409-7TRL through Aetrix?

Please submit a Request for Quotation (RFQ) for AUIRFSA8409-7TRL 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 AUIRFSA8409-7TRL reliable?

The price and inventory of AUIRFSA8409-7TRL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AUIRFSA8409-7TRL is usually 5 days.

3.What payment methods are accepted for AUIRFSA8409-7TRL?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AUIRFSA8409-7TRL transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AUIRFSA8409-7TRL?

AUIRFSA8409-7TRL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AUIRFSA8409-7TRL 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 AUIRFSA8409-7TRL?

For technical support, including AUIRFSA8409-7TRL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AUIRFSA8409-7TRL requirements.

6.How does Aetrix verify that AUIRFSA8409-7TRL is sourced from the original manufacturer or authorized distributors?

All AUIRFSA8409-7TRL 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 AUIRFSA8409-7TRL meets industry standards.

7.What is the process for return or replacement of AUIRFSA8409-7TRL?

All AUIRFSA8409-7TRL units undergo pre-shipment inspection (PSI). If there is an issue with AUIRFSA8409-7TRL, 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 AUIRFSA8409-7TRL part is unused and in its original packaging.

Return procedure for AUIRFSA8409-7TRL:

1.Submit a request within 90 days.

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

Tech Hub

2026-08-06 Conditional Access Module: CAM, CI/CI+ and DVB Security

Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…

2026-08-03 Electronic Component Obsolescence: EOL Risks, Replacement Options and Last-Time Buy Strategy

Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.

2026-07-29 18650 Battery: Voltage, Capacity, Charging and Pack Design

18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…

2026-07-27 Hall Effect Sensor: Working Principle, Types, Circuits and Applications

Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…

2026-07-20 Product Change Notification (PCN) in Electronic Components: Meaning and Supply Chain Response

Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…

2026-07-19 Blend Door Actuator: Symptoms, Location, Reset and Replacement Guide

A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…

2026-07-17 Raspberry Pi Alternatives: Chip-Level Comparison, Compatibility and Replacement Guide

Engineering guide to Raspberry Pi alternatives, covering chip-level differences, Orange Pi, ROCK, Jetson, Banana Pi, NanoPi, Compute Module, Pico, GPIO, camera, HAT compatibility, and replacement risks…

2026-07-13 How to Test Dynamic Load Response in Low-Voltage High-Current Buck Converters

Engineering guide to dynamic load response testing for high-current buck converters, covering load step setup, slew rate, Vcore undershoot, overshoot, recovery time, probe location, output capacitors a…

2026-07-08 Output Capacitor Selection for High-Current ASIC Vcore Rails

Engineering guide to output capacitor selection for ASIC Vcore rails, covering bulk capacitors, polymer capacitors, MLCC decoupling, DC bias, ESR, ESL, placement, transient response and substitution ri…

2026-07-07 High-Current ASIC Core Power Supply Design: 12-Phase Buck, PMBus and Dynamic Load Response

Engineering guide to high-current ASIC Vcore rails, covering 12-phase buck architecture, PMBus control, dynamic load testing, output capacitor networks, smart power stage selection, thermal design and …