Infineon Technologies IRLR8103

Overview

IRLR8103 from Infineon Technologies (formerly International Rectifier) is an N-channel enhancement-mode power MOSFET in TO-252AA (D-Pak) package, optimized as the synchronous rectifier FET in high-frequency DC-DC buck converters for CPU core voltage regulation. It delivers 6 mΩ R_DS(on) at V_GS = 10 V, 15 A, supports 89 A continuous drain current at T_A = 25°C, and exhibits 45 nC total gate charge and 20.3 nC switching charge - enabling high-efficiency, low-loss operation in 30 V input systems.

For engineers reviewing the IRLR8103 datasheet, IRLR8103 pinout, IRLR8103 application, or IRLR8103 equivalent, key selection criteria include its 6 mΩ conduction resistance at 10 V drive, 45 nC gate charge for fast synchronous switching, C_dv/dt-induced turn-on immunity validated for buck converter topologies, and thermal resistance of 1.4 °C/W junction-to-case - all critical for stable, high-current CPU VRM designs.

Technical Context

The IRLR8103 employs HEXFET® silicon technology with optimized cell layout to minimize both R_DS(on) and Q_G, targeting synchronous rectification where low forward voltage drop and rapid turn-off are essential. Its 6 mΩ on-resistance at 10 V gate drive and 7 mΩ at 4.5 V enable efficient operation under typical 5 V or 3.3 V gate control in modern VRMs.

It is 100% tested for R_DS(on), Q_G, and C_dv/dt immunity - ensuring robustness against false turn-on during high dV/dt transitions in synchronous buck stages. The device features a body diode with 0.9 V forward voltage at 15 A and 100 nC reverse recovery charge, supporting clean commutation in hard-switched topologies.

Key Specifications

Pinout & Package

IRLR8103 is housed in a surface-mount TO-252AA (D-Pak) package with exposed drain pad for enhanced thermal performance. The package supports vapor phase, infrared, convection, and wave soldering, and enables >80 W power dissipation in typical PCB mount configurations.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous rectifier MOSFET applications.

Compared with IRLR8721 and SiR872DP, the IRLR8103 offers the optimal balance of ultra-low R_DS(on), moderate Q_G, and superior thermal interface - making it the preferred choice for thermally demanding, high-current synchronous buck applications where both conduction and switching losses must be minimized simultaneously.

Availability

IRLR8103 is available at Aetrix Electronics and suitable for server CPU voltage regulators, laptop core power supplies, GPU power modules, and AI accelerator VRMs requiring stable component supply and long-term industrial availability.

Supply support for IRLR8103 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 global semiconductor leader specializing in power management, automotive, and industrial control solutions, with deep expertise in silicon-based power MOSFETs and wide-bandgap technologies.

The IRLR8103 belongs to Infineon's HEXFET® Application-Specific MOSFET product line, engineered explicitly for high-efficiency synchronous rectification in CPU/GPU core DC-DC converters - emphasizing low R_DS(on), controlled gate charge, and validated C_dv/dt immunity.

FAQ

What is the maximum continuous drain current for IRLR8103 at 90°C case temperature?

The IRLR8103 supports 61 A continuous drain current at T_L = 90°C, as specified in the Absolute Maximum Ratings table. This rating assumes proper PCB copper area and thermal vias to maintain junction temperature ≤150°C under sustained load, consistent with its 1.4 °C/W R_θJC and 42 W power dissipation limit at that temperature.

Can IRLR8103 be used as a high-side switch in a buck converter?

No - the IRLR8103 is optimized as a synchronous rectifier (low-side FET) and lacks integrated level-shifting or bootstrap gate drive support required for high-side operation. Its gate threshold voltage (2.0–4.0 V) and logic-level compatibility make it suitable only for ground-referenced switching, where gate drive is referenced to source potential.

What is the significance of the 100% C_dv/dt immunity testing for IRLR8103?

This means every unit is tested to ensure immunity against false turn-on caused by rapid voltage transients across the drain-source terminals - a critical failure mode in synchronous buck converters during high dV/dt transitions. It eliminates the need for external gate clamping circuits or negative turn-off bias, improving system reliability and simplifying PCB layout.

How does the TO-252AA package of IRLR8103 compare thermally to TO-220 or SO-8 packages?

The TO-252AA provides 1.4 °C/W junction-to-case thermal resistance - significantly better than SO-8 (~60 °C/W) and competitive with TO-220 (~1.0–1.2 °C/W) - while offering surface-mount compatibility. Its exposed drain pad enables direct thermal transfer to inner-layer copper planes, achieving >80 W dissipation in optimized PCB layouts, unlike leaded TO-220 which requires mechanical mounting.