Infineon Technologies IRL3102PBF

Overview

IRL3102PBF from Infineon Technologies (formerly International Rectifier) is a 20 V, 61 A, logic-level N-channel HEXFET® Power MOSFET in TO-220AB package, optimized for high-efficiency DC-DC conversion and synchronous rectification in low-voltage power supplies. It features R_DS(on) ≤ 7.5 mΩ at V_GS = 4.5 V, 100% avalanche-rated operation, and enhanced thermal performance for continuous high-current switching.

For engineers reviewing the IRL3102PBF datasheet, IRL3102PBF pinout, IRL3102PBF application, or IRL3102PBF equivalent, key selection criteria include its 4.5 V gate drive compatibility, single-pulse avalanche energy of 350 mJ, and junction-to-case thermal resistance of 1.3 °C/W - critical for compact, high-density power stage designs.

Technical Context

This MOSFET employs trench-gate silicon technology to achieve low on-resistance with fast switching characteristics. Its gate threshold voltage (V_GS(th)) ranges from 1.0 V to 2.0 V, enabling reliable turn-on with standard 3.3 V or 5 V logic controllers. The device supports continuous drain current up to 61 A at T_C = 25 °C and derates to 35 A at T_C = 100 °C.

Thermal design is supported by a low R_θJC of 1.3 °C/W and a maximum junction temperature of 175 °C. The integrated body diode exhibits reverse recovery time (t_rr) < 60 ns and Q_rr ≈ 28 nC at I_F = 35 A, making it suitable for hard-switched and synchronous buck topologies.

Key Specifications

Pinout & Package

IRL3102PBF is housed in a TO-220AB package with exposed drain tab for thermal and electrical connection. The case is electrically connected to pins 2 and 4 (both Drain terminals), requiring isolation from heatsink unless referenced to system ground.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IRL3102PBF, IRL3803PBF trades 0.5 mΩ higher on-resistance for broader legacy supply chain availability, while STL220N3LLH6 delivers better conduction efficiency in compact layouts but eliminates field-replaceable through-hole serviceability.

Availability

IRL3102PBF is available at Aetrix Electronics and suitable for server VRMs, USB-C PD adapters, and industrial PLC I/O modules requiring stable component supply across multi-year production cycles.

Supply support for IRL3102PBF 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 leader specializing in power management, automotive, and industrial control ICs and discrete devices, with global manufacturing and quality certification to IATF 16949 and ISO 9001.

The HEXFET® Power MOSFET product line was originally developed by International Rectifier and continues under Infineon to deliver high-reliability, high-efficiency discrete power switches for demanding switching power applications.

FAQ

What is the maximum safe operating voltage for IRL3102PBF in continuous DC operation?

The absolute maximum drain-to-source voltage (V_DS) is 20 V DC. Exceeding this - even briefly - risks irreversible avalanche breakdown. For 12 V systems with ISO 7637-2 Pulse 5a transients, external clamping (e.g., TVS) is required, as the device's rated V_DS provides no margin above 16 V transients.

Can IRL3102PBF be used as a high-side switch with 3.3 V GPIO control?

No - the source node must be referenced to ground for logic-level gate drive. As a high-side switch, the gate voltage must exceed the source by ≥4.5 V to achieve low R_DS(on), requiring a bootstrap or charge-pump gate driver. Direct 3.3 V GPIO control is only valid in low-side configuration.

Does IRL3102PBF require a gate resistor for typical 500 kHz switching?

Yes - a 5–10 Ω series gate resistor is recommended to damp ringing caused by gate-drain capacitance (C_gd) and PCB inductance. Without it, V_GS overshoot exceeding 20 V can occur, risking gate oxide damage despite the 20 V absolute max rating.

How does the dual-drain pin (pins 2 and 4) affect PCB layout and thermal design?

Pins 2 and 4 are internally shorted to the metal tab and must be routed to the same net - typically the high-current drain return path. Both pins must be soldered to a common copper pour connected to the heatsink. Splitting them across separate traces causes current imbalance and localized heating, degrading R_θJC performance by up to 30%.