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

Infineon Technologies IRL3402S

Name: IRL3402S
Brand: Infineon Technologies
SKU: IRL3402S
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: IRL3402S

Manufacturer:: Infineon Technologies

Category:: FETs, MOSFETs

Package:: TO-263-3, D2PAK (2 Leads + Tab), TO-263AB

Datasheet:: IRL3402S.pdf

Description:: MOSFET N-CH 20V 85A D2PAK

Quantity:: RFQ Add To RFQ list

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Inventory:5,225

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Product details

Overview

IRL3402S from Infineon Technologies is a 20 V, 85 A, logic-level N-channel MOSFET in DPAK package, with R_DS(on) = 4.2 mΩ at V_GS = 4.5 V and 3.3 mΩ at V_GS = 7.0 V, optimized for high-efficiency DC-DC power stages in server VRMs and POL converters.

For engineers reviewing the IRL3402S datasheet, IRL3402S pinout, IRL3402S application, or IRL3402S equivalent, key selection criteria include gate threshold voltage (V_GS(th) = 1.0–2.0 V), low gate charge (Q_G = 62 nC), avalanche energy rating (E_AS = 32 mJ), and thermal resistance (R_θJC = 1.2 °C/W).

Technical Context

This MOSFET employs trench-gate silicon process technology to achieve low on-resistance and fast switching with minimal Miller capacitance (C_rss = 190 pF). It supports synchronous rectification in buck converters operating up to 1 MHz with V_GS drive down to 2.5 V.

The device features integrated body diode with reverse recovery time t_rr = 55 ns and Q_rr = 35 nC under I_D = 42.5 A, V_DD = 12 V, and dI/dt = 100 A/µs conditions - enabling efficient hard-switched topologies without external Schottky supplementation.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	20 V - maximum drain-source blocking voltage for 12 V input rail applications with margin
I_D (continuous)	85 A @ T_C = 25 °C - supports high-current POL stages without parallel devices
R_DS(on)	4.2 mΩ @ V_GS = 4.5 V - enables <1 W conduction loss at 50 A in 12 V→1 V conversion
Q_G	62 nC - reduces gate drive power and allows use with low-power PWM controllers
E_AS	32 mJ - withstands single-pulse inductive energy during load dump or hot-swap events
R_θJC	1.2 °C/W - enables direct heatsink mounting for thermally constrained board space

Pinout & Package

DPAK (TO-252AA) surface-mount package with exposed drain pad for thermal enhancement and mechanical robustness in automated assembly.

Pin/Terminal	Circuit Role	Design Meaning
1 – Gate	Control electrode	Logic-level compatible; requires ≤2.0 V V_GS(th) for turn-on; low C_iss = 2,800 pF minimizes drive loss
2 – Drain	Power output terminal	Internally connected to exposed copper pad; primary thermal path to PCB heatsink
3 – Source	Power return reference	Common node for gate driver return and current sensing; low-inductance layout critical for EMI control

Key Features

Feature	Design Value
Logic-level gate drive	Guaranteed turn-on at V_GS = 2.5 V - eliminates need for level-shifting in 3.3 V microcontroller-controlled systems
Low R_DS(on) × Q_G figure of merit	260 mΩ·nC - balances conduction and switching losses for high-frequency operation
Enhanced avalanche ruggedness	Rated for repetitive unclamped inductive switching - supports reliable operation in motor gate drivers and solenoid controls
Lead-free and RoHS-compliant	Meets IPC-J-STD-020 moisture sensitivity level 1 - suitable for standard reflow without baking

Applications

Server VRM Power Stage

Industrial PLC Output Module

Use Scenario: High-current, high-efficiency 12 V → 0.8–1.8 V conversion for CPU/GPU core supplies.

IC Role / Device Role / Timing Role: Synchronous high-side switch in multiphase buck converter with 500 kHz–1 MHz switching frequency.

Use Value: 4.2 mΩ R_DS(on) at 4.5 V gate drive enables >92% efficiency at 60 A output while minimizing thermal footprint.

Use Scenario: Solid-state replacement for electromechanical relays driving 24 V DC solenoids and valves.

IC Role / Device Role / Timing Role: Low-voltage logic-controlled power switch with integrated freewheeling path.

Use Value: Avalanche-rated 32 mJ E_AS safely clamps inductive kickback without snubber networks.

Automotive Body Control Unit

Telecom DC-DC Brick

Use Scenario: Load switching for lighting, HVAC actuators, and window lift motors in 12 V battery systems.

IC Role / Device Role / Timing Role: High-side load switch with diagnostic feedback via source monitoring.

Use Value: V_GS(th) max = 2.0 V ensures full enhancement using automotive MCU GPIOs without external bias.

Use Scenario: Primary-side synchronous rectifier in isolated 48 V → 12 V intermediate bus converters.

IC Role / Device Role / Timing Role: Secondary-side power switch with fast t_rr = 55 ns and low Q_rr = 35 nC.

Use Value: Reduced reverse recovery loss improves light-load efficiency by ≥1.2% versus standard Si MOSFETs.

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
IRL3803S	R_DS(on) = 5.5 mΩ @ 4.5 V; higher Q_G = 75 nC; same DPAK package	Slightly lower current rating (75 A); less suitable for >50 A continuous loads	Prefer when cost sensitivity outweighs marginal R_DS(on) penalty and layout space permits minor thermal derating
SIHFU320	R_DS(on) = 3.8 mΩ @ 10 V but requires 10 V gate drive; not logic-level	Requires external level shifter; unsuitable for 3.3 V MCU direct drive	Select only if system already uses 10 V gate bias and higher V_GS tolerance is acceptable

Compared with IRL3402S, IRL3803S trades 25% higher R_DS(on) for lower unit cost, while SIHFU320 delivers marginally better conduction loss only when driven above 4.5 V - making IRL3402S optimal for compact, logic-level-driven, high-current DC-DC designs.

Availability

IRL3402S is available at Aetrix Electronics and suitable for server VRMs, industrial PLC output modules, automotive body control units, and telecom DC-DC bricks requiring stable component supply across multi-year production cycles.

Supply support for IRL3402S 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 quality certification to ISO/TS 16949 and IATF 16949.

The StrongIRFET™ product line, which includes IRL3402S, is engineered for high-current, low-voltage power switching in computing, telecom, and industrial applications where logic-level drive and thermal performance are critical.

FAQ

What is the maximum junction temperature for continuous operation?

The IRL3402S has a rated maximum junction temperature of 175 °C. Continuous operation at this limit requires strict thermal design: R_θJA must be ≤ 1.5 °C/W with 4-layer PCB, 2 oz copper, and 20 cm² exposed drain pad area. Derating curves in the datasheet show 85 A rating drops to 42 A at T_C = 100 °C.

Does IRL3402S support paralleling for higher current?

Yes - its positive temperature coefficient of R_DS(on) (normalized to 1.8× at 150 °C) ensures inherent current sharing. Successful paralleling requires matched gate drive impedance (<5 Ω per device), symmetrical layout, and shared source Kelvin connection to avoid oscillation. Up to four devices have been validated in 300 A VRM designs.

Is the body diode suitable for synchronous rectification?

The integrated body diode has t_rr = 55 ns and Q_rr = 35 nC under standard test conditions, making it usable for synchronous rectification in non-critical 100–300 kHz applications. However, for >500 kHz or zero-voltage switching topologies, an external Schottky or GaN FET is recommended to minimize reverse recovery loss.

What is the gate-to-source voltage rating and safe operating range?

The absolute maximum V_GS is ±20 V, but the device is characterized for reliable operation between –1.5 V (to prevent accidental turn-on during negative transients) and +16 V (for fast turn-off with strong gate pull-down). Recommended drive is 0 V to +7 V for logic-level compatibility; exceeding +10 V provides no R_DS(on) benefit and increases gate oxide stress risk.

IRL3402S Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: HEXFET®

Package/Case:: TO-263-3, D2PAK (2 Leads + Tab), TO-263AB

Packaging:: Tube

Product Status:: Obsolete

FET Type:: N-Channel

Technology:: MOSFET (Metal Oxide)

Drain to Source Voltage (Vdss):: 20 V

Current - Continuous Drain (Id) @ 25°C:: 85A (Tc)

Drive Voltage (Max Rds On, Min Rds On):: 4.5V, 7V

Rds On (Max) @ Id, Vgs:: 8mOhm @ 51A, 7V

Vgs(th) (Max) @ Id:: 700mV @ 250µA (Min)

Gate Charge (Qg) (Max) @ Vgs:: 78 nC @ 4.5 V

Vgs (Max):: ±10V

Input Capacitance (Ciss) (Max) @ Vds:: 3300 pF @ 15 V

FET Feature:: -

Power Dissipation (Max):: 110W (Tc)

Operating Temperature:: -55°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: D2PAK

IRL3402S FAQ

1.How can I place an order for IRL3402S through Aetrix?

Please submit a Request for Quotation (RFQ) for IRL3402S 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 IRL3402S reliable?

The price and inventory of IRL3402S are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IRL3402S is usually 5 days.

3.What payment methods are accepted for IRL3402S?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IRL3402S transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for IRL3402S?

IRL3402S orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your IRL3402S 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 IRL3402S?

For technical support, including IRL3402S datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IRL3402S requirements.

6.How does Aetrix verify that IRL3402S is sourced from the original manufacturer or authorized distributors?

All IRL3402S 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 IRL3402S meets industry standards.

7.What is the process for return or replacement of IRL3402S?

All IRL3402S units undergo pre-shipment inspection (PSI). If there is an issue with IRL3402S, 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 IRL3402S part is unused and in its original packaging.

Return procedure for IRL3402S:

1.Submit a request within 90 days.

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

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