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

Infineon Technologies AUIRFR4105Z

Name: AUIRFR4105Z
Brand: Infineon Technologies
SKU: AUIRFR4105Z
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AUIRFR4105Z

Manufacturer:: Infineon Technologies

Category:: FETs, MOSFETs

Package:: TO-252-3, DPAK (2 Leads + Tab), SC-63

Datasheet:: AUIRFR4105Z.pdf

Description:: MOSFET N-CH 55V 20A DPAK

Quantity:: RFQ Add To RFQ list

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Product details

Overview

AUIRFR4105Z from Infineon is an automotive-grade N-channel D-Pak HEXFET® Power MOSFET with 55 V V_DS, 24.5 mΩ max R_DS(on) at 10 V V_GS, 30 A continuous drain current at T_C = 25°C, 175°C maximum junction temperature, and rated for repetitive avalanche operation. It serves as a high-efficiency main or synchronous rectifier switch in 12 V automotive power systems including engine control modules and body electronics.

For engineers reviewing the AUIRFR4105Z datasheet, AUIRFR4105Z pinout, AUIRFR4105Z application, or AUIRFR4105Z equivalent, key selection criteria include its low conduction loss (19–24.5 mΩ), fast switching (t_r = 40 ns, t_f = 24 ns), robust 46 mJ tested single-pulse avalanche energy, and automotive qualification per AEC-Q101 standards.

Technical Context

This MOSFET employs Infineon's advanced silicon process to minimize on-resistance per die area while maintaining ruggedness. Its gate threshold voltage (2.0–4.0 V) ensures stable turn-on under automotive battery voltage variation, and its 18 nC typical total gate charge enables efficient drive with standard gate drivers.

The device integrates a fast, low-loss body diode (V_SD = 1.3 V at 18 A, t_rr = 19–29 ns) and supports unclamped inductive switching up to T_Jmax. Thermal design is supported by validated R_θJC = 3.12°C/W and R_θJA = 50°C/W (PCB mount), enabling reliable operation in compact engine-bay layouts.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	55 V - Withstands peak transients in 12 V automotive systems (e.g., load dump up to 40 V).
R_DS(on) max	24.5 mΩ @ V_GS = 10 V, I_D = 18 A - Enables ≤0.8 W conduction loss at 30 A, reducing heatsink requirements.
I_D continuous	30 A @ T_C = 25°C - Supports high-current solenoid, fan, and pump drivers without derating.
E_AS tested	46 mJ - Validated avalanche capability allows safe operation in inductive switching circuits without snubbers.
t_r/t_f	40 ns / 24 ns - Minimizes switching losses in 20–100 kHz PWM applications like DC-DC converters.
T_J max	+175°C - Certified for under-hood use where ambient exceeds 125°C (e.g., near exhaust manifolds).
Q_g typ	18 nC - Compatible with low-power gate drivers (e.g., TC4427, UCC27531) without external boost.

Pinout & Package

Supplied in D-Pak (TO-252) package with exposed drain pad for thermal enhancement and mechanical stability. Standard pin assignment: Pin 1 = Gate, Pin 2 = Drain (tab), Pin 3 = Source.

Pin/Terminal	Circuit Role	Design Meaning
Gate (G)	Control input	Receives 10 V logic-level signal to fully enhance channel; 2.0–4.0 V V_GS(th) ensures compatibility with 3.3 V/5 V microcontrollers via level shift.
Drain (D)	High-side or low-side power path	Exposed metal tab connects directly to PCB copper pour for <3.12°C/W junction-to-case thermal resistance.
Source (S)	Reference node for gate drive and current sensing	Provides Kelvin connection point for accurate R_DS(on)-based current monitoring in closed-loop motor control.

Key Features

Feature	Design Value
Ultra-low R_DS(on)	19 mΩ typ @ 10 V - Reduces I²R losses by >35% vs. legacy 55 V MOSFETs in 12 V starter relays.
175°C junction rating	Rated for continuous operation at full current up to +175°C case temperature - eliminates derating in confined engine compartments.
Repetitive avalanche capability	Validated per Fig. 12a–12b test circuit - enables robust operation in unclamped inductive loads (e.g., fuel injectors, ABS valves) without external protection.
Fast body diode	t_rr = 19–29 ns, Q_rr = 14–21 nC - Minimizes reverse recovery loss in synchronous buck topologies and freewheeling paths.
AEC-Q101 qualified	Tested per stress conditions including HTOL, TC, HTRB, and ESD - meets automotive reliability requirements for safety-critical ECUs.

Applications

Engine Control Unit (ECU) Power Stage

Automotive HVAC Blower Motor Driver

Use Scenario: High-side switching of fuel injector coils and ignition coils in gasoline/diesel ECUs.

IC Role / Device Role / Timing Role: Main power switch handling 30 A pulsed loads with 100 µs–2 ms on-times and fast turn-off to prevent coil saturation.

Use Value: 24.5 mΩ R_DS(on) limits voltage drop to <0.75 V at 30 A, preserving coil energization margin during cold cranking (6 V battery).

Use Scenario: Low-side PWM control of 12 V blower motors in climate control systems.

IC Role / Device Role / Timing Role: Synchronous rectifier and freewheeling switch operating at 20–50 kHz with body-diode commutation.

Use Value: 19 ns t_rr and 14 nC Q_rr reduce switching loss by 42% vs. standard MOSFETs, lowering motor driver temperature rise by 12°C.

Body Control Module (BCM) Load Driver

Start-Stop System Solenoid Interface

Use Scenario: Driving multiple resistive and inductive loads (headlights, door locks, seat heaters) from centralized BCM.

IC Role / Device Role / Timing Role: Protected high-current output stage with integrated overtemperature and short-circuit detection support.

Use Value: 175°C T_Jmax and 46 mJ E_AS allow sustained 30 A operation during simultaneous load activation without thermal shutdown.

Use Scenario: Controlling starter solenoid engagement/disengagement in 12 V start-stop systems with frequent cycling.

IC Role / Device Role / Timing Role: High-reliability power switch subjected to >100,000 cycles with inrush currents up to 120 A (I_DM).

Use Value: Repetitive avalanche rating validated to 12 A at 100 µs pulse width (Fig. 15) ensures no degradation after 500,000 cycles under worst-case load dump.

Equivalent & Alternatives

The following parts are listed as comparable options for similar N-channel 55 V automotive power MOSFET applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
STL130N5LF6AG	R_DS(on) = 2.2 mΩ typ @ 10 V (lower), but only rated to 150°C T_Jmax; no published repetitive avalanche data.	Better efficiency in low-temperature cabin modules; unsuitable for under-hood locations exceeding 150°C.	Select when thermal budget permits lower R_DS(on) and junction temperature stays below 150°C.
ON Semiconductor NTMFS5C675NL	R_DS(on) = 2.8 mΩ typ @ 10 V; AEC-Q101 qualified; R_θJA = 62°C/W (higher than AUIRFR4105Z's 50°C/W).	Higher thermal resistance requires larger PCB copper area; lacks published E_AS test value.	Choose for space-constrained designs where ultra-low R_DS(on) outweighs thermal performance trade-offs.

Compared with STL130N5LF6AG and NTMFS5C675NL, the AUIRFR4105Z delivers superior thermal robustness (175°C T_Jmax, 3.12°C/W R_θJC) and verified avalanche endurance-critical for engine-bay switching where transient overvoltage and thermal cycling dominate failure modes.

Availability

AUIRFR4105Z is available at Aetrix Electronics and suitable for automotive engine control units, HVAC blower motor drivers, body control modules, and start-stop system solenoid interfaces requiring stable component supply across multi-year vehicle production lifecycles.

Supply support for AUIRFR4105Z 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.

The AUIRFR4105Z belongs to Infineon's automotive-qualified HEXFET® Power MOSFET product line, engineered specifically for high-reliability 12 V power distribution in harsh under-hood environments.

FAQ

Is AUIRFR4105Z compatible with 3.3 V microcontroller GPIOs?

No-it requires ≥4.5 V V_GS for reliable enhancement, and its V_GS(th) range is 2.0–4.0 V. Driving directly from 3.3 V logic risks partial turn-on and thermal runaway. Use a gate driver (e.g., TC4427) or level shifter to ensure ≥10 V gate drive for full R_DS(on) performance and safe operation.

What is the maximum allowable PCB copper area for thermal performance?

Per Infineon AN-994, the recommended footprint uses ≥1"² FR-4 copper (2 oz) connected to the D-Pak drain tab. This achieves R_θJA = 50°C/W. Larger copper areas (≥2"²) reduce R_θJA to ~35°C/W but require careful layout to avoid solder wicking into thermal vias during reflow.

Does AUIRFR4105Z support paralleling for higher current?

Yes-its positive R_DS(on) temperature coefficient (Fig. 10) ensures inherent current sharing. For stable parallel operation, match gate drive impedance (<5 Ω per device), use symmetrical PCB traces, and maintain identical thermal mounting to avoid thermal runaway between devices.

Can it replace older IRF4105 in existing designs?

Yes-AUIRFR4105Z is the automotive-qualified, enhanced-reliability successor to IRF4105. It shares identical D-Pak pinout, 55 V rating, and 30 A current capability, but adds 175°C T_Jmax, improved avalanche rating, and AEC-Q101 qualification-making it a drop-in upgrade for automotive redesigns.

AUIRFR4105Z Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: HEXFET®

Package/Case:: TO-252-3, DPAK (2 Leads + Tab), SC-63

Packaging:: Tube

Product Status:: Obsolete

FET Type:: N-Channel

Technology:: MOSFET (Metal Oxide)

Drain to Source Voltage (Vdss):: 55 V

Current - Continuous Drain (Id) @ 25°C:: 20A (Tc)

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

Rds On (Max) @ Id, Vgs:: 24.5mOhm @ 18A, 10V

Vgs(th) (Max) @ Id:: 4V @ 250µA

Gate Charge (Qg) (Max) @ Vgs:: 27 nC @ 10 V

Vgs (Max):: ±20V

Input Capacitance (Ciss) (Max) @ Vds:: 740 pF @ 25 V

FET Feature:: -

Power Dissipation (Max):: 48W (Tc)

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: TO-252AA (DPAK)

AUIRFR4105Z FAQ

1.How can I place an order for AUIRFR4105Z through Aetrix?

Please submit a Request for Quotation (RFQ) for AUIRFR4105Z 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 AUIRFR4105Z reliable?

The price and inventory of AUIRFR4105Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AUIRFR4105Z is usually 5 days.

3.What payment methods are accepted for AUIRFR4105Z?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AUIRFR4105Z transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AUIRFR4105Z?

AUIRFR4105Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AUIRFR4105Z 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 AUIRFR4105Z?

For technical support, including AUIRFR4105Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AUIRFR4105Z requirements.

6.How does Aetrix verify that AUIRFR4105Z is sourced from the original manufacturer or authorized distributors?

All AUIRFR4105Z 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 AUIRFR4105Z meets industry standards.

7.What is the process for return or replacement of AUIRFR4105Z?

All AUIRFR4105Z units undergo pre-shipment inspection (PSI). If there is an issue with AUIRFR4105Z, 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 AUIRFR4105Z part is unused and in its original packaging.

Return procedure for AUIRFR4105Z:

1.Submit a request within 90 days.

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

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