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

Infineon Technologies AUIRF3805

Name: AUIRF3805
Brand: Infineon Technologies
SKU: AUIRF3805
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AUIRF3805

Manufacturer:: Infineon Technologies

Category:: FETs, MOSFETs

Package:: TO-220-3

Datasheet:: AUIRF3805.pdf

Description:: MOSFET N-CH 55V 160A TO220

Quantity:: RFQ Add To RFQ list

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Product details

Overview

AUIRF3805 from Infineon is an automotive-grade N-channel enhancement-mode HEXFET® Power MOSFET in TO-220AB package, rated for 55 V V_DSS, 2.6 mΩ typ. R_DS(on) at 10 V V_GS, 160 A package-limited continuous drain current, and 175°C maximum junction temperature. It serves as a high-efficiency main switch in 12 V/24 V automotive powertrain and body control modules.

For engineers reviewing the AUIRF3805 datasheet, AUIRF3805 pinout, AUIRF3805 application, or AUIRF3805 equivalent, key selection criteria include its ultra-low on-resistance, repetitive avalanche capability up to T_jmax, fast switching (t_r = 20 ns, t_f = 87 ns), thermal robustness under high-current pulsed loads, and RoHS-compliant lead-free construction.

Technical Context

This MOSFET employs advanced silicon processing to minimize conduction losses while maintaining rugged unclamped inductive switching performance. Its gate charge profile (Q_g = 190–290 nC) and low C_iss/C_oss (7960 pF / 1260 pF at V_DS = 25 V) support high-frequency DC-DC and motor drive operation with minimal driver loss.

The device integrates a robust body diode with 36–54 ns reverse recovery time and 47–71 nC Q_rr, enabling synchronous rectification and freewheeling in bidirectional power stages. Thermal design is anchored by R_θJC = 0.50°C/W and validated 175°C junction operation under sustained 160 A load at T_C = 100°C.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DSS	55 V - Withstands transients up to automotive ISO 7637-2 Pulse 5a (120 V clamp) when used with appropriate snubbing.
R_DS(on) typ.	2.6 mΩ @ V_GS = 10 V, I_D = 75 A - Enables <1.5 W conduction loss at 75 A, critical for high-current starter solenoid drivers.
I_D (Package)	160 A @ T_C = 25°C - Matches mechanical mounting limits of TO-220AB heatsink interfaces without bond-wire derating.
E_AS tested	940 mJ - Supports ≥1000 cycles of 75 A inductive turn-off at T_j = 25°C without degradation.
t_r/t_f	20 ns / 87 ns @ I_D = 75 A - Allows >200 kHz PWM in BLDC motor gate drivers with controlled EMI rise/fall edges.
T_J max	+175°C - Permits operation in engine bay environments with ambient up to +125°C and 50°C case-to-ambient delta.
Q_g	190–290 nC - Requires ≥2 A peak gate driver for ≤100 ns turn-on in high-side configurations.

Pinout & Package

TO-220AB package with isolated tab (drain-connected), standard 3-pin vertical mounting footprint. Mounting torque: 10 lbf·in (1.1 N·m); soldering temperature limit: 300°C for 10 s at 1.6 mm from case.

Pin/Terminal	Circuit Role	Design Meaning
Drain (Tab)	Main power output terminal	Electrically connected to metal tab; requires insulating washer when mounted to grounded heatsink.
Source	Power return and reference node	Low-inductance path for high di/dt return current; ties to PCB ground plane via multiple vias.
Gate	Control input	High-impedance CMOS-compatible node; requires 10 V drive for full enhancement; sensitive to ESD (±20 V absolute max).

Key Features

Feature	Design Value
Ultra-low R_DS(on)	2.6 mΩ typ. enables <1.5 W conduction loss at 75 A, reducing thermal load in space-constrained ECUs.
175°C operating temperature	Validated junction rating allows direct placement near heat sources (e.g., transmission control units) without external derating.
Repetitive avalanche rated	Up to T_jmax - eliminates need for external clamping diodes in inductive load switching (e.g., fuel injector drivers).
Fast switching with low Q_g	190–290 nC total gate charge supports efficient 200+ kHz PWM in 48 V mild-hybrid DC-DC converters.
Automotive qualification	AEC-Q101 qualified per Infineon's automotive standards - includes HTOL, temperature cycling, and HTRB validation.

Applications

Engine Start-Stop System

Electric Power Steering (EPS)

Use Scenario: High-current solenoid and pre-charge switching during automatic engine restart.

IC Role / Device Role / Timing Role: Main power switch controlling 12 V battery-to-starter circuit with 200 ms pulse duration and 150 A peak.

Use Value: 2.6 mΩ R_DS(on) limits voltage drop to <400 mV, ensuring reliable solenoid actuation even at cold cranking (-40°C).

Use Scenario: Bidirectional motor phase switching in 3-phase EPS H-bridge inverters.

IC Role / Device Role / Timing Role: Low-side switch handling 80 A continuous phase current with 10 kHz PWM modulation.

Use Value: 36 ns trr and 47 nC Q_rr reduce body-diode conduction loss and EMI during commutation zero-crossings.

12 V/48 V DC-DC Converter

Body Control Module (BCM) Load Switch

Use Scenario: Synchronous rectifier in high-efficiency buck converter supplying 48 V auxiliary systems from 12 V battery.

IC Role / Device Role / Timing Role: Secondary-side power switch operating at 250 kHz with 75 A RMS current.

Use Value: 0.50°C/W R_θJC enables direct heatsink mounting to sustain 95% efficiency at full load without forced air.

Use Scenario: High-side power distribution switch for lighting, HVAC, and window lift actuators.

IC Role / Device Role / Timing Role: Protected load switch with integrated overcurrent and thermal shutdown response.

Use Value: Repetitive avalanche rating absorbs inductive kickback from 200 W lamp filaments without external TVS.

Equivalent & Alternatives

The following parts are listed as comparable options for similar N-channel power MOSFET applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
STL220N5LF8AG	55 V, 1.8 mΩ R_DS(on), DFN8 5×6 mm package, no isolated tab	Lacks TO-220 mechanical compatibility and avalanche rating; optimized for surface-mount compact converters	Select only if board space constraints prohibit through-hole mounting and avalanche stress is absent.
IRF3205PbF	55 V, 8.0 mΩ R_DS(on), TO-220AB, non-automotive grade, 175°C rated	Higher conduction loss (+3×), no AEC-Q101 qualification, lower E_AS (520 mJ)	Acceptable for cost-sensitive industrial motor controls where automotive reliability and transient immunity are not required.

Compared with STL220N5LF8AG and IRF3205PbF, AUIRF3805 uniquely combines automotive qualification, ultra-low on-resistance, and validated repetitive avalanche performance-making it the only choice for safety-critical 12 V/24 V power switching where thermal margin, transient robustness, and long-term field reliability are mandatory.

Availability

AUIRF3805 is available at Aetrix Electronics and suitable for engine control units, electric power steering systems, and 12 V/48 V DC-DC converters requiring stable component supply across extended automotive production lifecycles.

Supply support for AUIRF3805 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 microcontrollers, and sensor solutions, with global manufacturing and quality certification to IATF 16949.

AUIRF3805 belongs to Infineon's automotive-qualified HEXFET® Power MOSFET product line, engineered specifically for high-reliability 12 V/24 V vehicle electrical systems demanding low conduction loss, thermal resilience, and rugged unclamped switching behavior.

FAQ

What is the maximum continuous drain current for AUIRF3805 at 100°C case temperature?

The maximum continuous drain current is 150 A at T_C = 100°C under silicon-limited conditions (V_GS = 10 V), as specified in the Absolute Maximum Ratings table. This reflects thermal derating from the 210 A rating at 25°C, constrained by junction temperature limits and internal bond wire capacity.

Does AUIRF3805 require a gate resistor for automotive PWM applications?

Yes - a gate resistor (typically 2.6 Ω to 10 Ω) is required to control dV/dt and prevent parasitic oscillation during fast switching. The device's 190–290 nC gate charge and low gate threshold (2.0–4.0 V) make it susceptible to shoot-through without proper gate drive impedance matching to the driver IC's output capability.

Can AUIRF3805 be used in parallel configurations for higher current handling?

Yes - its positive R_DS(on) temperature coefficient (R_DS(on) increases with temperature) enables inherent current sharing. However, layout symmetry (matched gate and source inductance), identical gate drive timing, and thermal coupling between devices are mandatory to avoid current imbalance and localized overheating.

Is the TO-220AB package of AUIRF3805 electrically isolated?

No - the metal tab is internally connected to the Drain terminal and is not electrically isolated. When mounting to a conductive heatsink, an insulating washer (e.g., mica or silicone pad) and shoulder washer must be used to prevent short circuits, especially in high-side configurations where the drain is at bus potential.

AUIRF3805 Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: HEXFET®

Package/Case:: TO-220-3

Packaging:: Bulk

Product Status:: Obsolete

FET Type:: N-Channel

Technology:: MOSFET (Metal Oxide)

Drain to Source Voltage (Vdss):: 55 V

Current - Continuous Drain (Id) @ 25°C:: 160A (Tc)

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

Rds On (Max) @ Id, Vgs:: 3.3mOhm @ 75A, 10V

Vgs(th) (Max) @ Id:: 4V @ 250µA

Gate Charge (Qg) (Max) @ Vgs:: 290 nC @ 10 V

Vgs (Max):: ±20V

Input Capacitance (Ciss) (Max) @ Vds:: 7960 pF @ 25 V

FET Feature:: -

Power Dissipation (Max):: 300W (Tc)

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220

AUIRF3805 FAQ

1.How can I place an order for AUIRF3805 through Aetrix?

Please submit a Request for Quotation (RFQ) for AUIRF3805 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 AUIRF3805 reliable?

The price and inventory of AUIRF3805 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AUIRF3805 is usually 5 days.

3.What payment methods are accepted for AUIRF3805?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AUIRF3805 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AUIRF3805?

AUIRF3805 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AUIRF3805 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 AUIRF3805?

For technical support, including AUIRF3805 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AUIRF3805 requirements.

6.How does Aetrix verify that AUIRF3805 is sourced from the original manufacturer or authorized distributors?

All AUIRF3805 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 AUIRF3805 meets industry standards.

7.What is the process for return or replacement of AUIRF3805?

All AUIRF3805 units undergo pre-shipment inspection (PSI). If there is an issue with AUIRF3805, 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 AUIRF3805 part is unused and in its original packaging.

Return procedure for AUIRF3805:

1.Submit a request within 90 days.

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

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