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

Infineon Technologies IRL3303

Name: IRL3303
Brand: Infineon Technologies
SKU: IRL3303
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: IRL3303

Manufacturer:: Infineon Technologies

Category:: FETs, MOSFETs

Package:: TO-220-3

Datasheet:: IRL3303.pdf

Description:: MOSFET N-CH 30V 38A TO220AB

Quantity:: RFQ Add To RFQ list

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Product details

Overview

IRL3303 from International Rectifier is a logic-level N-channel Power MOSFET in TO-220AB package, rated for 30V V_DSS, 38A continuous drain current at 25°C, and 0.026Ω R_DS(on) at V_GS = 10V. It features fast switching (t_r = 200ns), full avalanche rating (E_AS = 130mJ), and 175°C maximum junction temperature - deployed in DC-DC converters, motor drives, and hot-swap circuits.

For engineers reviewing the IRL3303 datasheet, IRL3303 pinout, IRL3303 application, or IRL3303 equivalent, key selection criteria include gate threshold voltage (1.0–2.5V), low R_DS(on) at 4.5V (0.040Ω), body diode recovery performance (t_rr = 72–110ns), and thermal resistance (R_θJC = 2.2°C/W).

Technical Context

This HEXFET device uses fifth-generation silicon processing to minimize on-resistance per die area while maintaining rugged unclamped inductive switching capability. Its logic-level gate drive enables direct interfacing with 3.3V/5V microcontrollers without level-shifting circuitry.

The integrated body diode supports synchronous rectification and reverse recovery under high di/dt conditions (5.0V/ns peak dv/dt rating). Thermal design is facilitated by low junction-to-case resistance and compatibility with standard TO-220 heatsinks using flat, greased mounting surfaces.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DSS	30V - Maximum blocking voltage before avalanche; suitable for 24V bus systems with margin.
R_DS(on) @ V_GS = 10V	0.026Ω - Enables <1W conduction loss at 20A, reducing heatsink requirements.
R_DS(on) @ V_GS = 4.5V	0.040Ω - Ensures robust turn-on with standard logic-level drivers (e.g., STM32 GPIO).
I_D @ T_C = 25°C	38A - Continuous current rating under ideal heatsinking; derates linearly above 25°C case temp.
E_AS	130mJ - Single-pulse avalanche energy; allows safe operation during inductive load turn-off transients.
t_r/t_f	200ns/36ns - Fast switching reduces switching losses in high-frequency SMPS (≥100kHz).
R_θJC	2.2°C/W - Low thermal resistance enables efficient heat transfer to external heatsink.

Pinout & Package

IRL3303 is housed in a TO-220AB package with isolated tab (Drain-connected), standardized lead assignment, and mechanical dimensions compliant with JEDEC TO-220-AB outline. The package supports screw-mount heatsinking and offers low-cost, high-reliability power handling up to 68W at 25°C case temperature.

Pin/Terminal	Circuit Role	Design Meaning
1 (Left)	Gate	Logic-level control input; requires ≤100nA leakage current and 26nC total gate charge for full enhancement.
2 (Center)	Drain	Main high-side power terminal; electrically connected to metal tab for heatsink mounting.
3 (Right)	Source	Power return path and reference for gate drive; internal source inductance is 7.5nH.

Key Features

Feature	Design Value
Logic-Level Gate Drive	Operates fully enhanced with V_GS ≥ 4.5V - eliminates need for gate driver ICs in MCU-based designs.
Fully Avalanche Rated	Withstands unclamped inductive switching events up to 130mJ without failure - enhances system reliability in motor control.
Dynamic dv/dt Rating	5.0V/ns - suppresses false turn-on during high-speed voltage transients in half-bridge configurations.
175°C Operating Temperature	Enables deployment in high-ambient environments (e.g., automotive engine compartments, industrial enclosures).
Low Q_gd/Q_gs Ratio	15nC / 8.8nC - improves Miller immunity and enables stable operation in hard-switched topologies.

Applications

DC-DC Buck Converter

Brushed DC Motor Driver

Use Scenario: High-efficiency 24V-to-5V step-down converter in industrial PLC I/O modules.

IC Role / Device Role: Synchronous high-side switch with integrated body diode used for freewheeling.

Use Value: 0.026Ω R_DS(on) minimizes conduction loss; fast t_r/t_f enables 250kHz operation with <3% switching loss.

Use Scenario: Bidirectional 24V H-bridge driving 15A brushed motors in warehouse automation carts.

IC Role / Device Role: Low-side switching element with logic-level gate compatible with PWM controller outputs.

Use Value: 4.5V gate threshold ensures full enhancement from 5V logic; 140A pulsed rating handles motor stall currents.

Hot-Swap Controller

LED Constant-Current Driver

Use Scenario: Inrush-limited 24V board insertion in telecom line cards with backplane power feeds.

IC Role / Device Role: Main pass transistor regulating current during soft-start phase.

Use Value: Low R_DS(on) limits voltage drop across FET; avalanche rating protects against load-dump transients.

Use Scenario: Dimmable 30W LED string driver in commercial lighting fixtures with analog/PWM dimming.

IC Role / Device Role: Low-side current sink modulating LED current via gate-controlled R_DS(on).

Use Value: Tight V_GS(th) tolerance (1.0–2.5V) ensures consistent current regulation across temperature and unit variance.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STP36NF06L	V_DSS = 60V, R_DS(on) = 0.022Ω @ 10V, but higher Q_g (45nC) and slower t_r (300ns)	Better voltage margin for 48V systems; less suitable for >200kHz switching due to gate charge	Select when higher breakdown voltage is required and switching frequency is ≤100kHz.
IRLZ44N	V_DSS = 55V, R_DS(on) = 0.028Ω @ 5V, lower ID (49A) but same TO-220AB package and pinout	Compatible footprint and gate drive; slightly higher conduction loss at 20A (0.56W vs. 0.52W)	Preferred for drop-in replacement where 55V rating adds safety margin without changing layout.

Compared with STP36NF06L and IRLZ44N, the IRL3303 delivers optimal balance of low R_DS(on), fast switching, and proven avalanche ruggedness for 24V industrial power stages - especially where thermal management is constrained and transient immunity is critical.

Availability

IRL3303 is available at Aetrix Electronics and suitable for DC-DC converters, motor drives, hot-swap controllers, and LED drivers requiring stable component supply and long-term industrial availability.

Supply support for IRL3303 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

International Rectifier (now part of Infineon Technologies) was a pioneer in power semiconductor innovation, specializing in high-efficiency MOSFETs, IGBTs, and driver ICs for industrial and automotive markets.

The IRL3303 belongs to the HEXFET® Logic-Level Power MOSFET product line, engineered specifically for direct microcontroller interface and high-reliability switching in space-constrained, thermally demanding power conversion systems.

FAQ

What is the maximum continuous drain current for IRL3303 at 100°C case temperature?

The IRL3303 supports 27A continuous drain current at T_C = 100°C with V_GS = 10V, as specified in the Absolute Maximum Ratings table. This reflects linear derating from 38A at 25°C using the 0.45W/°C factor and thermal resistance data.

Does IRL3303 require a gate resistor for stability in switching applications?

Yes - a gate resistor (typically 6.5Ω, per datasheet test conditions) is recommended to dampen ringing caused by gate loop inductance and prevent spurious turn-on due to Miller effect. Values between 4.7Ω and 10Ω balance switching speed and EMI control.

Can IRL3303 be used in parallel configurations for higher current handling?

Yes - its positive R_DS(on) temperature coefficient (0.035V/°C) enables inherent current sharing when paralleled. However, matched layout, symmetrical gate drive, and individual gate resistors are required to ensure balanced dynamic current distribution.

Is the TO-220AB package of IRL3303 electrically insulated from the Drain terminal?

No - the metal tab of the TO-220AB package is internally connected to the Drain terminal. Electrical isolation from heatsink requires insulating hardware (e.g., mica washer + thermal grease) or use of an isolated package variant like TO-220FP.

IRL3303 Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: HEXFET®

Package/Case:: TO-220-3

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:: 38A (Tc)

Drive Voltage (Max Rds On, Min Rds On):: 4.5V, 10V

Rds On (Max) @ Id, Vgs:: 26mOhm @ 20A, 10V

Vgs(th) (Max) @ Id:: 1V @ 250µA

Gate Charge (Qg) (Max) @ Vgs:: 26 nC @ 4.5 V

Vgs (Max):: ±16V

Input Capacitance (Ciss) (Max) @ Vds:: 870 pF @ 25 V

FET Feature:: -

Power Dissipation (Max):: 68W (Tc)

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220AB

IRL3303 FAQ

1.How can I place an order for IRL3303 through Aetrix?

Please submit a Request for Quotation (RFQ) for IRL3303 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 IRL3303 reliable?

The price and inventory of IRL3303 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IRL3303 is usually 5 days.

3.What payment methods are accepted for IRL3303?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IRL3303 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for IRL3303?

IRL3303 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your IRL3303 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 IRL3303?

For technical support, including IRL3303 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IRL3303 requirements.

6.How does Aetrix verify that IRL3303 is sourced from the original manufacturer or authorized distributors?

All IRL3303 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 IRL3303 meets industry standards.

7.What is the process for return or replacement of IRL3303?

All IRL3303 units undergo pre-shipment inspection (PSI). If there is an issue with IRL3303, 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 IRL3303 part is unused and in its original packaging.

Return procedure for IRL3303:

1.Submit a request within 90 days.

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

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