Infineon Technologies IRL3302

Overview

IRL3302 from International Rectifier is a 20V, 39A (at TC = 25°C, VGS = 4.5V) N-channel HEXFET® Power MOSFET in TO-220AB package, optimized for 4.5V gate drive and designed specifically for CPU core DC-DC converters in PCs. It features RDS(on) = 0.020 Ω at VGS = 4.5V/ID = 23A, 150°C max junction temperature, and fast switching with td(on) = 7.2 ns and tf = 89 ns.

For engineers reviewing the IRL3302 datasheet, IRL3302 pinout, IRL3302 application, or IRL3302 equivalent, key selection criteria include low-threshold 4.5V logic-level gate drive compatibility, high pulsed drain current (160A), avalanche ruggedness (EAS = 130 mJ), and thermal performance (RθJC = 2.2°C/W) in high-density power stages.

Technical Context

The IRL3302 employs advanced process technology and an optimized gate oxide to achieve low RDS(on) at 4.5V gate drive-enabling direct interface with low-voltage PWM controllers in synchronous buck converters. Its body diode exhibits trr = 62–94 ns and Qrr = 110–160 nC, supporting efficient synchronous rectification or freewheeling in high-frequency (<1 MHz) topologies.

Designed for CPU core voltage regulation, it operates reliably across –55°C to +150°C junction range with linear derating (0.45 W/°C above 25°C). The TO-220AB package provides low thermal resistance to heatsink (RθCS = 0.50°C/W) and robust mechanical mounting (10 lbf·in torque).

Key Specifications

Pinout & Package

IRL3302 is housed in a TO-220AB package with isolated tab (drain-connected), standard lead spacing, and mechanical mounting hole. Thermal path is optimized via metal tab contact to heatsink.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IRL3302, IRL3803 offers superior conduction efficiency at higher currents but demands more gate drive strength, while SI4435DY trades current capacity and thermal robustness for compactness-making IRL3302 the balanced choice for mainstream 20–40A CPU VRMs requiring TO-220 reliability and 4.5V drive simplicity.

Availability

IRL3302 is available at Aetrix Electronics and suitable for server CPU voltage regulators, laptop core power stages, and industrial PLC power modules requiring stable component supply and long-lifecycle support.

Supply support for IRL3302 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 MOSFET and IGBT design, headquartered in El Segundo, CA, with global manufacturing and application engineering presence.

The HEXFET® product line was developed specifically for high-efficiency, high-density DC-DC conversion-emphasizing low RDS(on), logic-level gate drive, and rugged avalanche performance in computing and industrial power systems.

FAQ

Is the IRL3302 suitable for synchronous rectification in a buck converter?

Yes. Its integrated body diode has trr = 62–94 ns and Qrr = 110–160 nC, enabling efficient synchronous rectification when paired with a complementary low-side FET. The low RDS(on) and fast switching further reduce total power loss in high-frequency (>300 kHz) topologies.

What is the maximum safe operating frequency for the IRL3302 in a 12V-input buck converter?

Based on its 110 ns rise time and 89 ns fall time, the IRL3302 supports stable operation up to 1 MHz in well-designed layouts with minimized parasitic inductance. Practical use in CPU VRMs typically ranges from 300 kHz to 600 kHz to balance efficiency, EMI, and gate drive losses.

Does the TO-220AB package require electrical isolation when mounted to a heatsink?

Yes. Pin 2 (Drain) and the metal tab are internally connected. If the heatsink is grounded or at a different potential, a thermally conductive but electrically isolating pad (e.g., mica or polymer film) must be used to prevent short circuits and ensure safety compliance.

Can the IRL3302 replace the IRF3710 in a 4.5V gate-driven application?

No. The IRF3710 requires ≥10V VGS for full enhancement (VGS(th) = 2–4V), whereas the IRL3302 is specified for full conduction at 4.5V. Substituting IRL3302 for IRF3710 in a 4.5V-driven circuit improves efficiency and reliability-but not vice versa without gate boosting.