Infineon Technologies IRF6608

Overview

IRF6608 from Infineon Technologies is a 30V N-channel Power MOSFET in DirectFET® ST package, optimized for synchronous buck converter high-side switches in CPU core DC-DC applications. It delivers 9.0 mΩ R_DS(on) at V_GS = 10 V, 16 nC total gate charge, and ultra-low 0.7 mm profile with dual-sided cooling capability.

For engineers reviewing the IRF6608 datasheet, IRF6608 pinout, IRF6608 application, or IRF6608 equivalent, key selection criteria include R_DS(on) vs. temperature stability, C_iss/C_oss ratio for switching loss control, Q_gd-to-Q_gs ratio for dv/dt immunity, and thermal resistance R_θJC = 3.0 °C/W for high-power-density board layouts.

Technical Context

The IRF6608 employs trench-gate HEXFET silicon with optimized doping profiles to achieve low R_DS(on) (7.0 mΩ typ. @ 25°C) while maintaining robust 30 V V_DSS rating and 1.0–3.0 V gate threshold voltage. Its low Q_gd (5.3 nC) and high Q_g/Q_gd ratio suppress false turn-on under high dv/dt conditions typical in multiphase VRMs.

Thermally, the DirectFET ST package enables direct top-side heatsinking and bottom-side PCB copper conduction, achieving R_θJ-PCB = 1.0 °C/W and reducing junction-to-ambient thermal resistance by 80% versus comparable SO-8 packages. The device supports 100 A pulsed drain current and operates up to 150°C junction temperature.

Key Specifications

Pinout & Package

IRF6608 uses the DirectFET® ST (Small Size Can, T-Designation) package - a top- and bottom-metalized copper can measuring 4.75 × 3.70 × 0.30 mm (L × W × H), with 0.7 mm maximum height. It features no leads; terminals are exposed metal surfaces on top (source) and bottom (drain), with gate connected via internal bond wire to a dedicated top-side pad.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-frequency synchronous buck MOSFET applications.

Compared with IRF6613 and SiR626DP, the IRF6608 provides the lowest R_DS(on) and best thermal performance in its class, making it optimal for high-power-density, high-frequency CPU/GPU VRMs where both conduction loss and thermal management are critical.

Availability

IRF6608 is available at Aetrix Electronics and suitable for server motherboard design, laptop VRM development, and AI accelerator power delivery requiring stable component supply and long-term lifecycle assurance.

Supply support for IRF6608 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, and industrial control ICs and discrete devices, with global manufacturing and quality certification to ISO/TS 16949 and IECQ QC 080000.

The IRF6608 belongs to Infineon's DirectFET® Power MOSFET product line, engineered specifically for high-efficiency, high-frequency DC-DC conversion in computing and data center power systems where thermal density and switching loss dominate design constraints.

FAQ

What is the recommended gate resistor value for IRF6608 in a 1 MHz synchronous buck converter?

A 2.2 Ω to 4.7 Ω non-inductive gate resistor is recommended to balance switching speed and gate ringing suppression. At 1 MHz, this range limits dV/dt to <50 V/ns while keeping turn-on delay below 15 ns and ensuring clean gate waveform integrity with typical 2 A peak gate drivers.

Can IRF6608 be used as a low-side switch in synchronous rectification?

Yes - its body diode has t_rr = 31–47 ns and V_SD = 0.94–1.2 V at 8.8 A, enabling efficient synchronous rectification. However, its gate threshold (1.0–3.0 V) requires careful driver design to avoid partial turn-on during dead time; use of a dedicated low-side gate driver with negative turn-off bias is advised.

Does IRF6608 require special PCB layout considerations beyond standard DirectFET guidelines?

Yes - the top-source terminal must be connected to a solid copper pour ≥10 mm² with ≥3 thermal vias (0.3 mm diameter, 0.8 mm pitch) to an inner-plane ground or power plane. The bottom-drain pad requires ≥2 oz copper and minimum 20 mm² thermal relief area to maintain R_θJ-PCB ≤ 1.0 °C/W as specified in AN-1035.

Is IRF6608 RoHS-compliant and halogen-free?

Yes - IRF6608 meets RoHS Directive 2011/65/EU and is certified halogen-free per IEC 61249-2-21, with brominated flame retardants and chlorine content each <900 ppm, verified per Infineon's material declaration document INF-09-0012-001.