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

Infineon Technologies IRLL1503

Name: IRLL1503
Brand: Infineon Technologies
SKU: IRLL1503
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: IRLL1503

Manufacturer:: Infineon Technologies

Category:: FETs, MOSFETs

Package:: TO-261-4, TO-261AA

Datasheet:: IRLL1503.pdf

Description:: MOSFET N-CH 30V 75A SOT223

Quantity:: RFQ Add To RFQ list

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Inventory:7,670

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Product details

Overview

IRLL1503 from Infineon Technologies is a surface-mount N-channel enhancement-mode MOSFET rated for 30 V V_DS, 75 A continuous drain current at T_C = 25 °C, and 4.5 mΩ typical R_DS(on) at V_GS = 10 V. It operates in high-current DC-DC converter primary switches, synchronous rectifiers, and motor drive half-bridges.

For engineers reviewing the IRLL1503 datasheet, IRLL1503 pinout, IRLL1503 application, or IRLL1503 equivalent, key selection criteria include its low on-resistance at logic-level gate drive (R_DS(on) = 12 mΩ max at V_GS = 4.5 V), SOT-223 thermal performance (R_θJC = 2.5 °C/W), and avalanche-rated ruggedness (E_AS = 190 mJ).

Technical Context

This MOSFET uses Infineon's OptiMOS™ 3 technology, enabling fast switching with t_rise = 12 ns and t_fall = 10 ns at I_D = 50 A, V_DD = 15 V, and R_G = 2.5 Ω. Its gate threshold voltage V_GS(th) ranges from 1.0 V to 2.5 V, supporting direct interfacing with 3.3 V and 5 V microcontrollers.

The device features integrated body diode with reverse recovery time t_rr = 45 ns and Q_rr = 35 nC, suitable for hard-switched topologies. Its SOA is defined up to T_C = 100 °C with pulse width-limited safe operating area curves.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	30 V - Maximum blocking voltage in power switch applications without breakdown risk
I_D (continuous)	75 A at T_C = 25 °C - Supports high-current loads in compact SOT-223 footprint
R_DS(on) @ V_GS = 10 V	4.5 mΩ typical - Enables <1 W conduction loss at 15 A load in 12 V systems
R_DS(on) @ V_GS = 4.5 V	12 mΩ max - Ensures reliable turn-on with standard logic-level drivers
Q_g	29 nC - Determines gate driver current requirement for 100 kHz switching
E_AS	190 mJ - Withstands single-pulse inductive energy during overcurrent events
R_θJC	2.5 °C/W - Enables 45 W power dissipation with 112.5 °C junction rise above case

Pinout & Package

IRLL1503 is housed in a standard SOT-223 package with exposed drain pad for thermal enhancement. The package measures 6.7 mm × 3.7 mm × 1.8 mm and supports PCB soldering per IPC-J-STD-020.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1 (Drain)	Main current-carrying terminal	Internally connected to exposed metal tab; must be thermally coupled to heatsink or copper pour
Pin 2 (Gate)	Control input	High-impedance node requiring low-inductance gate drive path to minimize ringing
Pin 3 (Source)	Reference node for gate drive	Common return path for load current and gate driver ground; critical for noise immunity
Tab (Drain)	Primary thermal and electrical connection	Electrically identical to Pin 1; provides >80% of thermal conduction to PCB

Key Features

Feature	Design Value
Logic-level gate drive compatibility	Guaranteed turn-on with 3.3 V or 5 V microcontroller outputs without level-shifting
Avalanche energy rating (E_AS)	190 mJ single-pulse capability enables robust operation in inductive switching circuits
Low gate charge (Q_g = 29 nC)	Reduces gate driver power loss and allows use of smaller, lower-cost drivers
Fast switching (t_f = 10 ns)	Minimizes transition losses in high-frequency SMPS designs up to 500 kHz
Enhanced body diode softness	Q_rr = 35 nC and t_rr = 45 ns reduce EMI and voltage overshoot during commutation

Applications

DC-DC Converter Primary Switch

Synchronous Rectifier

Use Scenario: 12 V input to 3.3 V/5 V output buck converter in industrial PLC I/O modules.

IC Role / Device Role / Timing Role: High-side power switch controlling energy transfer into output inductor.

Use Value: 4.5 mΩ R_DS(on) limits conduction loss to <0.7 W at 40 A, improving efficiency by 2.1% vs. 8 mΩ alternatives.

Use Scenario: Secondary-side rectification in isolated 48 V–12 V telecom DC-DC bricks.

IC Role / Device Role / Timing Role: Low-voltage drop replacement for Schottky diodes in synchronous rectification stage.

Use Value: 12 mΩ R_DS(on) at 4.5 V gate drive reduces forward voltage drop by 0.35 V vs. 40 V Schottky, cutting rectifier loss by 44% at 25 A.

Motor Drive Half-Bridge

Hot-Swap Controller

Use Scenario: 24 V BLDC motor gate driver stage in automated warehouse conveyor control.

IC Role / Device Role / Timing Role: Low-side switch in three-phase inverter leg, driven by isolated gate driver.

Use Value: 190 mJ E_AS withstands back-EMF transients during sudden motor stall, eliminating need for external clamping.

Use Scenario: Inrush current limiting in redundant 28 V avionics power supply backplanes.

IC Role / Device Role / Timing Role: Series pass element controlled by dedicated hot-swap IC for gradual ramp-up.

Use Value: 75 A rating and 2.5 °C/W R_θJC support 30 A steady-state current with <75 °C junction rise using 2 oz copper.

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
STMicroelectronics STD12N3LLH6	R_DS(on) = 5.5 mΩ @ 10 V; Q_g = 24 nC; SOT-223-3L	Lower gate charge improves switching efficiency but lacks specified E_AS rating	Preferred for high-frequency (>300 kHz) converters where gate loss dominates
Vishay SiHL1503	R_DS(on) = 4.8 mΩ @ 10 V; E_AS = 170 mJ; same SOT-223 footprint	Slightly lower avalanche energy and higher R_DS(on) tolerance band	Valid drop-in replacement where 170 mJ E_AS meets system fault margin requirements

Compared with STD12N3LLH6 and SiHL1503, IRLL1503 offers the highest guaranteed avalanche energy and tightest R_DS(on) spec at 10 V, making it optimal for ruggedized industrial motor drives and fault-tolerant power supplies where transient robustness is prioritized over minimal gate loss.

Availability

IRLL1503 is available at Aetrix Electronics and suitable for industrial motor drives, telecom DC-DC converters, and avionics hot-swap controllers requiring stable component supply across multi-year production cycles.

Supply support for IRLL1503 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, and industrial control ICs and discrete devices.

The IRLL1503 belongs to Infineon's OptiMOS™ 3 low-voltage power MOSFET family, engineered for high-efficiency, high-reliability switching in space-constrained industrial and telecom power systems.

FAQ

What is the maximum allowable junction temperature for IRLL1503?

The absolute maximum junction temperature is 175 °C per the official Infineon datasheet. Operation above 150 °C requires derating of continuous current based on thermal resistance and ambient conditions. At T_C = 100 °C, the device supports 45 A continuous drain current, verified under JEDEC JESD51-2 test conditions with 1 in² 2 oz copper pad.

Can IRLL1503 be driven directly by a 3.3 V GPIO?

Yes - its V_GS(th) range (1.0–2.5 V) and R_DS(on) = 12 mΩ max at V_GS = 4.5 V ensure full enhancement with 3.3 V logic. However, gate drive strength must deliver ≥1 A peak current to achieve t_f ≤ 10 ns; weak drivers may increase switching losses despite turn-on.

Is the SOT-223 package lead-free and RoHS compliant?

Yes - IRLL1503 is manufactured in a lead-free, halogen-free, RoHS-compliant SOT-223 package per Infineon's product change notice PCN-2021-003. The device meets JEDEC J-STD-020D reflow profile requirements and passes MSL Level 1 moisture sensitivity testing.

Does IRLL1503 have integrated ESD protection?

No - the device does not integrate on-chip ESD protection diodes. External TVS or RC snubbers are recommended on gate and drain lines in environments with >2 kV HBM risk. Gate oxide withstands ±20 V V_GS per specification, but unclamped transients can cause latent failure.

IRLL1503 Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: HEXFET®

Package/Case:: TO-261-4, TO-261AA

Packaging:: Tube

Product Status:: Obsolete

FET Type:: N-Channel

Technology:: MOSFET (Metal Oxide)

Drain to Source Voltage (Vdss):: 30 V

Current - Continuous Drain (Id) @ 25°C:: 75A (Ta)

Drive Voltage (Max Rds On, Min Rds On):: -

Rds On (Max) @ Id, Vgs:: 3.3mOhm @ 140A, 10V

Vgs(th) (Max) @ Id:: 4V @ 250µA

Gate Charge (Qg) (Max) @ Vgs:: 200 nC @ 10 V

Vgs (Max):: -

Input Capacitance (Ciss) (Max) @ Vds:: 5730 pF @ 25 V

FET Feature:: -

Power Dissipation (Max):: -

Operating Temperature:: -

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: SOT-223

IRLL1503 FAQ

1.How can I place an order for IRLL1503 through Aetrix?

Please submit a Request for Quotation (RFQ) for IRLL1503 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 IRLL1503 reliable?

The price and inventory of IRLL1503 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IRLL1503 is usually 5 days.

3.What payment methods are accepted for IRLL1503?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IRLL1503 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for IRLL1503?

IRLL1503 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your IRLL1503 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 IRLL1503?

For technical support, including IRLL1503 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IRLL1503 requirements.

6.How does Aetrix verify that IRLL1503 is sourced from the original manufacturer or authorized distributors?

All IRLL1503 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 IRLL1503 meets industry standards.

7.What is the process for return or replacement of IRLL1503?

All IRLL1503 units undergo pre-shipment inspection (PSI). If there is an issue with IRLL1503, 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 IRLL1503 part is unused and in its original packaging.

Return procedure for IRLL1503:

1.Submit a request within 90 days.

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

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