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

Infineon Technologies AUIRFU540Z

Name: AUIRFU540Z
Brand: Infineon Technologies
SKU: AUIRFU540Z
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AUIRFU540Z

Manufacturer:: Infineon Technologies

Category:: FETs, MOSFETs

Package:: TO-251-3 Short Leads, IPAK, TO-251AA

Datasheet:: AUIRFU540Z.pdf

Description:: MOSFET N-CH 100V 35A IPAK

Quantity:: RFQ Add To RFQ list

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Inventory:3,749

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Product details

Overview

AUIRFU540Z from Infineon is an automotive-grade N-channel enhancement-mode HEXFET® Power MOSFET in I-Pak package, rated for 100V V_DS, 35A continuous drain current at T_C = 25°C, and 22.5 mΩ typical R_DS(on) at V_GS = 10V. It operates up to 175°C junction temperature and delivers fast switching (t_r = 42 ns, t_f = 34 ns) with 75 mJ tested single-pulse avalanche energy - deployed in solenoid injection drivers and body control modules where robustness under repetitive inductive stress is critical.

For engineers reviewing the AUIRFU540Z datasheet, AUIRFU540Z pinout, AUIRFU540Z application, or AUIRFU540Z equivalent, key selection criteria include its 175°C automotive qualification, 1.64°C/W junction-to-case thermal resistance, 39 nC total gate charge, and validated unclamped inductive avalanche performance per Fig. 12a–12b and AN-1005.

Technical Context

This MOSFET employs trench-gate silicon processing to minimize conduction loss while maintaining high dV/dt immunity and low gate charge. Its 100V breakdown voltage supports 12V/24V automotive rail systems with margin against load-dump transients, and its 175°C T_J rating enables operation in engine-bay-mounted power stages without derating.

The device integrates a robust body diode with 32–48 ns reverse recovery time and 40–60 nC Q_rr, enabling synchronous rectification and freewheeling in DC-DC converters and motor drivers. Its R_DS(on) exhibits +0.092 V/°C temperature coefficient and remains stable across –55°C to +175°C operating range.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	100 V - Withstands automotive load-dump spikes up to ISO 7637-2 Pulse 5a (120 V peak) with safety margin.
R_DS(on) typ.	22.5 mΩ @ V_GS = 10V, I_D = 21A - Enables <1.5 W conduction loss at 21A, reducing heatsink requirements in 24V body control units.
I_D cont.	35 A @ T_C = 25°C - Supports high-current solenoid actuation (e.g., fuel injectors, door locks) without external paralleling.
E_AS tested	75 mJ - Validated single-pulse avalanche capability ensures reliability in unclamped inductive switching (e.g., relay/coil driving).
Q_g	39 nC - Low gate drive power requirement compatible with standard 5V/3.3V microcontroller GPIOs via buffer stage.
T_J max	175°C - Qualified per AEC-Q101, enabling placement near heat sources (e.g., under-hood ECUs) without thermal throttling.
t_r/t_f	42 ns / 34 ns - Fast edge rates reduce switching losses in PWM-controlled lighting and fan drivers operating up to 100 kHz.

Pinout & Package

Supplied in I-Pak (TO-251AA) surface-mount package with exposed drain pad for thermal enhancement. Pin assignment follows standard three-terminal MOSFET layout: Gate (G), Drain (D), Source (S).

Pin/Terminal	Circuit Role	Design Meaning
G	Gate control input	Receives 10V logic-level signal to fully enhance channel; threshold voltage 2.0–4.0 V allows compatibility with 3.3V/5V controllers.
D	Drain terminal	High-side switch node connected to load supply rail; electrically tied to exposed metal tab for low-inductance thermal path.
S	Source terminal	Return path for load current; referenced to system ground or floating node in high-side configurations.

Key Features

Feature	Design Value
Automotive qualification	AEC-Q101 qualified for under-hood use - eliminates need for additional qualification testing in Tier-1 ECU designs.
Repetitive avalanche rating	Validated per Fig. 12a–12b and AN-1005 - enables reliable operation in solenoid drivers without snubber circuits.
Low R_DS(on) × Q_g figure of merit	22.5 mΩ × 39 nC = 0.878 - balances conduction and switching loss for high-efficiency 24V DC-DC stages.
Enhanced body diode	t_rr = 32–48 ns, Q_rr = 40–60 nC - reduces voltage overshoot and EMI during freewheeling in brushed motor H-bridges.
Thermal robustness	R_θJC = 1.64°C/W - supports >60W power dissipation with minimal heatsinking when mounted on 1"² FR-4 PCB.

Applications

Automatic Voltage Regulator (AVR)

Solenoid Injection

Use Scenario: Regulating field excitation current in alternators to maintain stable battery charging voltage under varying engine speeds and loads.

IC Role / Device Role / Timing Role: High-side power switch controlling rotor coil current with PWM duty cycle modulation.

Use Value: 175°C T_J rating ensures uninterrupted regulation during sustained high-load conditions (e.g., highway cruising with HVAC active).

Use Scenario: Driving 12V diesel fuel injectors requiring precise 1–3 ms pulse-width actuation with high peak current (≥25A).

IC Role / Device Role / Timing Role: Low-side switch sinking injector coil current; handles unclamped inductive flyback energy.

Use Value: 75 mJ tested E_AS eliminates need for external TVS/clamp diodes, reducing BOM count and PCB area.

Body Control Module (BCM)

Low-Power Automotive Lighting

Use Scenario: Controlling power distribution to door locks, window lift motors, and seat adjusters in centralized vehicle body electronics.

IC Role / Device Role / Timing Role: Load switch managing up to 35A resistive/motor loads with integrated overtemperature protection.

Use Value: 22.5 mΩ R_DS(on) limits I²R heating to <2.8 W at 10A, enabling direct PCB copper pour heatsinking without discrete heatsinks.

Use Scenario: PWM dimming of LED headlamps and DRLs with current regulation up to 5A per channel.

IC Role / Device Role / Timing Role: High-frequency (≥100 kHz) switching element in buck converter output stage.

Use Value: 42 ns rise time and 34 ns fall time minimize switching transition losses, improving efficiency above 92% at full load.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STL130N10F7	100V, 130A, R_DS(on) = 6.5 mΩ (typ), PQFN5x6 package, Q_g = 42 nC	Higher current capacity but requires multilayer PCB with thermal vias; not pin-compatible with I-Pak footprint	Select for new designs needing higher current density and lower R_DS(on); re-layout required.
IRF3205PbF	55V, 110A, R_DS(on) = 8.0 mΩ (typ), TO-220AB package, Q_g = 71 nC	Lower voltage rating unsuitable for 24V systems; larger through-hole package increases assembly cost	Acceptable only in 12V-only legacy systems where 55V margin suffices and through-hole assembly is retained.

Compared with STL130N10F7 and IRF3205PbF, AUIRFU540Z provides optimal balance of 100V rating, I-Pak surface-mount compatibility, and proven 175°C automotive reliability - making it preferred for space-constrained, thermally demanding body control and solenoid applications.

Availability

AUIRFU540Z is available at Aetrix Electronics and suitable for Automatic Voltage Regulator (AVR), Solenoid Injection, and Body Control applications requiring stable component supply across automotive production lifecycles.

Supply support for AUIRFU540Z 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.

AUIRFU540Z belongs to Infineon's automotive-qualified HEXFET® Power MOSFET product line, engineered specifically for high-reliability switching in engine control, chassis, and body electronics under harsh thermal and electrical conditions.

FAQ

Is AUIRFU540Z suitable for high-side switching configurations?

Yes - its 100V V_DS rating and 175°C T_J allow safe operation in high-side configurations with bootstrap gate drive, provided V_GS remains within ±20V absolute maximum and gate driver can sustain 10V during conduction. Layout must minimize source inductance to avoid shoot-through during transitions.

What is the recommended PCB footprint for thermal performance?

Infineon recommends a minimum 1"² copper pour connected to the drain tab via ≥8 thermal vias (0.3mm diameter, 0.8mm spacing) to an internal ground plane. Footprint should follow AN-994 guidelines for I-Pak mounting - insufficient copper area raises R_θJA beyond 50°C/W, limiting power handling.

Does AUIRFU540Z require external gate resistor for EMI suppression?

A 10–22 Ω series gate resistor is recommended to damp ringing caused by L_S (7.5 nH) and L_D (4.5 nH) parasitics during fast switching. Without it, dv/dt exceeds 5 V/ns in hard-switched applications, increasing radiated emissions and risking false turn-on from Miller coupling.

Can AUIRFU540Z replace AUIRFR540Z in existing designs?

Yes - both share identical electrical specs, thermal ratings, and I-Pak package. AUIRFU540Z is the tube-packaged variant of AUIRFR540Z (tape-and-reel); no layout or schematic changes are needed. Functional equivalence is confirmed per Infineon's cross-reference documentation and shared datasheet revision history.

AUIRFU540Z Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: HEXFET®

Package/Case:: TO-251-3 Short Leads, IPAK, TO-251AA

Packaging:: Tube

Product Status:: Obsolete

FET Type:: N-Channel

Technology:: MOSFET (Metal Oxide)

Drain to Source Voltage (Vdss):: 100 V

Current - Continuous Drain (Id) @ 25°C:: 35A (Tc)

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

Rds On (Max) @ Id, Vgs:: 28.5mOhm @ 21A, 10V

Vgs(th) (Max) @ Id:: 4V @ 50µA

Gate Charge (Qg) (Max) @ Vgs:: 59 nC @ 10 V

Vgs (Max):: ±20V

Input Capacitance (Ciss) (Max) @ Vds:: 1690 pF @ 25 V

FET Feature:: -

Power Dissipation (Max):: 91W (Tc)

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: IPAK

AUIRFU540Z FAQ

1.How can I place an order for AUIRFU540Z through Aetrix?

Please submit a Request for Quotation (RFQ) for AUIRFU540Z 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 AUIRFU540Z reliable?

The price and inventory of AUIRFU540Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AUIRFU540Z is usually 5 days.

3.What payment methods are accepted for AUIRFU540Z?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AUIRFU540Z transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AUIRFU540Z?

AUIRFU540Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AUIRFU540Z 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 AUIRFU540Z?

For technical support, including AUIRFU540Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AUIRFU540Z requirements.

6.How does Aetrix verify that AUIRFU540Z is sourced from the original manufacturer or authorized distributors?

All AUIRFU540Z 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 AUIRFU540Z meets industry standards.

7.What is the process for return or replacement of AUIRFU540Z?

All AUIRFU540Z units undergo pre-shipment inspection (PSI). If there is an issue with AUIRFU540Z, 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 AUIRFU540Z part is unused and in its original packaging.

Return procedure for AUIRFU540Z:

1.Submit a request within 90 days.

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

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