Infineon Technologies IRL3402

Overview

IRL3402 from International Rectifier is a 20V, 85A logic-level N-channel Power MOSFET in TO-220AB package, optimized for 4.5V–7.0V gate drive and designed specifically for CPU core DC-DC converters. It delivers R_DS(on) = 0.01Ω at V_GS = 4.5V, supports pulsed drain current up to 340A, and features low gate charge (Q_g = 78nC) and fast switching (t_r = 140ns).

For engineers reviewing the IRL3402 datasheet, IRL3402 pinout, IRL3402 application, or IRL3402 equivalent, key selection criteria include its 4.5V logic-level gate compatibility, 0.01Ω on-resistance at low V_GS, avalanche energy rating (E_AS = 290mJ), thermal resistance (R_θJC = 1.1°C/W), and TO-220AB mechanical footprint for heatsink-mounting in high-current power stages.

Technical Context

The IRL3402 employs an advanced HEXFET process with optimized gate oxide design to achieve low R_DS(on) and high current density at logic-level gate voltages. Its body diode exhibits t_rr = 72–110ns and Q_rr = 160–240nC under 100A/µs di/dt, enabling efficient synchronous rectification in buck converters.

Thermal performance is defined by R_θJC = 1.1°C/W and R_θJA = 62°C/W, with linear derating of 0.91W/°C above 25°C case temperature. Safe operating area (SOA) is limited by R_DS(on) at DC and pulse widths ≤300µs, supporting robust transient handling in CPU VRMs.

Key Specifications

Pinout & Package

IRL3402 is housed in a through-hole TO-220AB package with isolated tab (drain-connected), rated for 110W power dissipation at 25°C case temperature and featuring low thermal resistance for industrial and computing power applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IRL3402, IRL3803 offers lower conduction loss at the cost of higher gate charge and reduced switching speed, while SI4435DY trades thermal performance and current capacity for miniaturization-making IRL3402 the balanced choice for medium-power, heatsink-mounted CPU VRMs.

Availability

IRL3402 is available at Aetrix Electronics and suitable for CPU core voltage regulation, server VRMs, industrial DC-DC converters, and point-of-load regulators requiring stable component supply and long-term industrial lifecycle support.

Supply support for IRL3402 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 engineering and manufacturing infrastructure focused on high-efficiency power conversion.

The HEXFET® product line, including IRL3402, was engineered specifically for high-current, low-voltage DC-DC conversion in computing and communications infrastructure-emphasizing logic-level drive, low R_DS(on), and rugged avalanche capability.

FAQ

Is IRL3402 suitable for 3.3V gate drive?

No. While IRL3402 is a logic-level MOSFET, its R_DS(on) is specified down to V_GS = 4.5V (0.01Ω). At 3.3V, R_DS(on) rises significantly-data shows ~0.015Ω at 3.3V-and gate threshold is only guaranteed ≥0.7V, not sufficient for reliable enhancement. Use only with ≥4.5V gate drive for full performance.

What is the maximum recommended case temperature for continuous operation?

The absolute maximum case temperature is 150°C, but continuous operation should be limited to ≤100°C to maintain reliability and avoid exceeding the 54A derated current limit. At T_C = 100°C, power dissipation must be ≤59W (per linear derating: 110W − 0.91W/°C × 75°C), and thermal design must ensure R_θJA remains within safe limits.

Does IRL3402 have avalanche-rated capability?

Yes. IRL3402 is fully rated for single-pulse avalanche with E_AS = 290mJ (T_J = 25°C, L = 220µH, I_AS = 51A) and repetitive avalanche E_AR = 11mJ. This rating enables robustness against inductive switching transients in buck converters without external protection components.

Can the TO-220AB tab be electrically connected to system ground?

No-the tab is internally connected to the drain (Pin 2). If mounted to a grounded heatsink, electrical isolation (e.g., mica washer + shoulder washer) is mandatory. Failure to insulate risks shorting the drain node to ground, destroying the device and potentially damaging the controller or power stage.