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

Infineon Technologies AUIRFSL8405

Name: AUIRFSL8405
Brand: Infineon Technologies
SKU: AUIRFSL8405
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AUIRFSL8405

Manufacturer:: Infineon Technologies

Category:: FETs, MOSFETs

Package:: TO-262-3 Long Leads, I2PAK, TO-262AA

Datasheet:: AUIRFSL8405.pdf

Description:: MOSFET N-CH 40V 120A TO262

Quantity:: RFQ Add To RFQ list

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Inventory:9,560

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Product details

Overview

AUIRFSL8405 from Infineon Technologies is an automotive-grade N-channel enhancement-mode HEXFET® Power MOSFET in TO-262 package, rated for 40V V_DSS, 1.9mΩ typ. R_DS(on) at V_GS = 10V, 193A silicon-limited continuous drain current, and 175°C maximum junction temperature. It serves as a high-efficiency main power switch in electric power steering (EPS) and start-stop battery management systems.

For engineers reviewing the AUIRFSL8405 datasheet, AUIRFSL8405 pinout, AUIRFSL8405 application, or AUIRFSL8405 equivalent, key selection criteria include its ultra-low on-resistance, repetitive avalanche capability up to T_jmax, fast switching (t_r = 128ns), body diode recovery performance (Q_rr = 44nC), and AEC-Q101 qualification for under-hood automotive use.

Technical Context

This MOSFET employs advanced trench-gate process technology to minimize conduction losses while maintaining robust thermal and avalanche performance. Its gate threshold voltage (2.2–3.9V) ensures reliable turn-on with standard 3.3V/5V logic-level drivers in automotive microcontroller interfaces.

The device integrates a co-packaged intrinsic p-n junction body diode with 0.9–1.3V forward voltage and 44ns reverse recovery time at 100A, enabling synchronous rectification and freewheeling in high-current DC-DC converters without external diodes.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DSS	40V - Maximum blocking voltage before avalanche; suitable for 12V/24V automotive battery rails with margin against load-dump transients.
R_DS(on) typ.	1.9mΩ @ V_GS = 10V, I_D = 100A - Enables <1.9W conduction loss at 100A, critical for thermally constrained EPS motor control modules.
I_D (Silicon Limited)	193A @ T_C = 25°C - Reflects die current capacity before thermal saturation; actual usable current limited by package and PCB layout.
E_AS (tested)	181mJ - Single-pulse avalanche energy rating validated per JEDEC JESD24-11; supports fault-tolerant operation during inductive load switching.
Q_g	107nC typ. - Total gate charge determines driver strength requirement; compatible with standard automotive gate drivers (e.g., INFINEON 2EDN7524R).
T_J max	175°C - Extended junction temperature enables operation in engine bay environments without derating below ambient 125°C.
C_oss eff. (ER)	878pF - Energy-related effective output capacitance used to calculate switching loss during hard-switched transitions.

Pinout & Package

TO-262 (Straight Lead, 3-Pin) package with exposed drain tab for low-thermal-resistance mounting to heatsink. Pin 1 = Gate, Pin 2 = Drain (tab), Pin 3 = Source.

Pin/Terminal	Circuit Role	Design Meaning
Gate (G)	Control input	Receives voltage-controlled signal to modulate channel conductivity; requires <2.3Ω internal gate resistance for predictable switching timing.
Drain (D)	High-side power terminal	Connected to battery rail or inductive load; electrically tied to metal tab for direct thermal path to heatsink (R_θJC = 0.92°C/W).
Source (S)	Return path / reference node	Serves as common return for gate drive and load current; forms Kelvin sense point for accurate current monitoring in closed-loop EPS control.

Key Features

Feature	Design Value
Ultra-low R_DS(on)	1.9mΩ typ. reduces I²R losses in high-current EPS motor phases, directly lowering thermal stress on PCB copper and heatsink size.
175°C operating junction temperature	Enables full-rated performance in under-hood locations where ambient exceeds 105°C, eliminating need for forced air cooling in compact modules.
Repetitive avalanche rated	Validated for repeated energy absorption up to 181mJ per pulse, supporting robustness against inductive kickback in solenoid and relay drive circuits.
Fast body diode recovery	t_rr = 44ns and Q_rr = 44nC at 100A allow efficient freewheeling in synchronous buck converters without significant voltage overshoot or shoot-through risk.
AEC-Q101 qualified	Passes stress tests including HTOL, TC, UHAST, and ESD per automotive reliability standards-ensures long-term field reliability in safety-critical EPS systems.

Applications

Electric Power Steering (EPS)

Battery Disconnect Switch

Use Scenario: High-current H-bridge motor driver controlling torque assist in passenger vehicle steering column.

IC Role / Device Role / Timing Role: Main power switch in low-side configuration; handles bidirectional 150A peak motor current with <100ns switching transitions.

Use Value: 1.9mΩ R_DS(on) limits conduction loss to <2.1W at 150A, enabling passive cooling and meeting ISO 26262 ASIL-B thermal safety targets.

Use Scenario: High-side isolation switch between 12V battery and vehicle sub-systems during key-off sleep mode.

IC Role / Device Role / Timing Role: Load switch managing >100A standby current; activated only during ignition cycles to prevent parasitic drain.

Use Value: 175°C T_Jmax and 181mJ E_AS ensure survival during accidental short-circuit events without fuse intervention.

Start-Stop Micro-Hybrid System

48V–12V Bidirectional DC-DC Converter

Use Scenario: Cranking assist MOSFET bridging starter battery and auxiliary supercapacitor bank during engine restart.

IC Role / Device Role / Timing Role: Synchronous rectifier in boost converter stage; commutated at 100kHz with zero-voltage switching.

Use Value: Fast t_r/t_f (128ns/77ns) and low C_oss eff. (878pF) reduce switching loss to <0.8W at 100kHz, improving system efficiency by 1.2% over legacy parts.

Use Scenario: Primary-side high-frequency switch in isolated dual-active-bridge (DAB) converter linking 48V mild-hybrid rail to 12V chassis network.

IC Role / Device Role / Timing Role: Hard-switched primary switch operating at 200kHz; subjected to 40V V_DS and 120A peak current.

Use Value: Repetitive avalanche rating allows safe operation during transient overvoltage events caused by transformer leakage inductance ringing.

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-current automotive power switching applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
STL220N4F7AG	40V, 2.2mΩ R_DS(on), TO-263 package, 175°C T_Jmax, but lower E_AS (120mJ) and no AEC-Q101 documentation in public datasheet.	Lacks certified automotive qualification; suitable for industrial DC-DC but not safety-critical EPS or start-stop.	Select only if AEC-Q101 is not required and board space permits larger D2Pak footprint.
IXTH120N40L2	40V, 2.0mΩ R_DS(on), TO-247 package, 175°C T_Jmax, higher Q_g (150nC), and unqualified for automotive use.	Higher gate drive power demand and no thermal qualification for under-hood vibration or humidity exposure.	Preferable only for non-automotive high-power UPS or motor drives where thermal margin exceeds 30°C.

Compared with STL220N4F7AG and IXTH120N40L2, AUIRFSL8405 delivers superior automotive readiness via AEC-Q101 certification, lower gate charge, and higher validated avalanche energy-making it the only choice for ASIL-B compliant EPS and battery disconnect functions.

Availability

AUIRFSL8405 is available at Aetrix Electronics and suitable for electric power steering (EPS), battery disconnect switches, and start-stop micro-hybrid systems requiring stable component supply across multi-year automotive production programs.

Supply support for AUIRFSL8405 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 qualification infrastructure.

AUIRFSL8405 belongs to Infineon's automotive-qualified HEXFET® Power MOSFET product line, engineered specifically for high-reliability, high-current switching in engine compartment and chassis-mounted electronic control units.

FAQ

What is the maximum continuous drain current for AUIRFSL8405 at 100°C case temperature?

At T_C = 100°C, the continuous drain current is 137A (silicon-limited) per the Absolute Maximum Ratings table. This value reflects thermal derating due to reduced channel mobility and increased R_DS(on) at elevated temperatures, and assumes proper heatsinking with R_θJC ≤ 0.92°C/W.

Is AUIRFSL8405 pin-compatible with AUIRFS8405?

No-AUIRFSL8405 uses TO-262 (straight-lead) packaging, while AUIRFS8405 uses D2Pak (TO-263) packaging. Although both share identical electrical specifications and die, their land patterns, thermal vias, and mechanical mounting differ; PCB redesign is required for substitution.

Does AUIRFSL8405 require a gate resistor for automotive EMI compliance?

Yes-a series gate resistor of 2.7Ω is recommended per the dynamic test conditions in the datasheet to control dv/dt and limit EMI emissions during switching. This value balances rise/fall time (128ns/77ns) against radiated emissions in the 150kHz–30MHz CISPR 25 Class 5 band.

Can AUIRFSL8405 be used in parallel configurations for >200A applications?

Yes-its positive R_DS(on) temperature coefficient (0.026V/°C) enables inherent current sharing when paralleled with matched devices. Designers must ensure symmetrical PCB layout, identical gate drive paths, and thermal coupling to avoid thermal runaway above 150°C junction temperature.

AUIRFSL8405 Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: HEXFET®

Package/Case:: TO-262-3 Long Leads, I2PAK, TO-262AA

Packaging:: Tube

Product Status:: Obsolete

FET Type:: N-Channel

Technology:: MOSFET (Metal Oxide)

Drain to Source Voltage (Vdss):: 40 V

Current - Continuous Drain (Id) @ 25°C:: 120A (Tc)

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

Rds On (Max) @ Id, Vgs:: 2.3mOhm @ 100A, 10V

Vgs(th) (Max) @ Id:: 3.9V @ 100µA

Gate Charge (Qg) (Max) @ Vgs:: 161 nC @ 10 V

Vgs (Max):: ±20V

Input Capacitance (Ciss) (Max) @ Vds:: 5193 pF @ 25 V

FET Feature:: -

Power Dissipation (Max):: 163W (Tc)

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-262

AUIRFSL8405 FAQ

1.How can I place an order for AUIRFSL8405 through Aetrix?

Please submit a Request for Quotation (RFQ) for AUIRFSL8405 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 AUIRFSL8405 reliable?

The price and inventory of AUIRFSL8405 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AUIRFSL8405 is usually 5 days.

3.What payment methods are accepted for AUIRFSL8405?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AUIRFSL8405 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AUIRFSL8405?

AUIRFSL8405 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AUIRFSL8405 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 AUIRFSL8405?

For technical support, including AUIRFSL8405 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AUIRFSL8405 requirements.

6.How does Aetrix verify that AUIRFSL8405 is sourced from the original manufacturer or authorized distributors?

All AUIRFSL8405 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 AUIRFSL8405 meets industry standards.

7.What is the process for return or replacement of AUIRFSL8405?

All AUIRFSL8405 units undergo pre-shipment inspection (PSI). If there is an issue with AUIRFSL8405, 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 AUIRFSL8405 part is unused and in its original packaging.

Return procedure for AUIRFSL8405:

1.Submit a request within 90 days.

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

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