Infineon Technologies IRFH8318TRPBF

Overview

IRFH8318TRPBF from Infineon Technologies is a 30 V, 50 A N-channel enhancement-mode HEXFET Power MOSFET in PQFN 5×6 mm package, optimized as a synchronous rectifier in high-frequency buck converters. It delivers R_DS(on) = 2.5 mΩ (typ) at V_GS = 10 V, Q_g = 19 nC (typ), and features ultra-low thermal resistance R_θJC(Bottom) = 1.7 °C/W for direct PCB heat transfer.

For engineers reviewing the IRFH8318TRPBF datasheet, IRFH8318TRPBF pinout, IRFH8318TRPBF application, or IRFH8318TRPBF equivalent, key selection criteria include its 30 V V_DS, 2.5 mΩ on-resistance at 10 V gate drive, 19 nC total gate charge, PQFN 5×6 mm footprint with bottom-side thermal pad, and suitability for high-efficiency DC-DC conversion in space-constrained power stages.

Technical Context

This device operates as a low-side synchronous rectifier in fixed-frequency or adaptive-frequency buck regulators. Its 30 V V_DS rating supports 12 V and 24 V input rails, while the 2.5 mΩ R_DS(on) minimizes conduction loss at 20–50 A load currents. The 19 nC Q_g enables fast switching with moderate gate drive strength.

Thermal design leverages the PQFN's exposed bottom thermal pad and 1.7 °C/W R_θJC(Bottom), allowing direct copper pour attachment to PCB ground planes. Body diode parameters-V_SD = 1.0 V (max), t_rr = 16–24 ns, Q_rr = 35–53 nC-support efficient reverse recovery during dead-time transitions.

Key Specifications

Pinout & Package

PQFN 5×6 mm Outline "E" package with exposed bottom thermal pad and three surface-mount terminals: Drain (D), Source (S), and Gate (G). Thermal pad must be soldered to PCB copper for rated current and thermal performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SiR872DP-T1-GE3 and CSD18540Q5B, IRFH8318TRPBF offers the lowest R_DS(on) in this 30 V PQFN class, making it optimal for thermally constrained, high-current buck stages where conduction loss dominates efficiency calculations.

Availability

IRFH8318TRPBF is available at Aetrix Electronics and suitable for server VRMs, telecom POL converters, and industrial motor drive auxiliary supplies requiring stable component supply and long-term production continuity.

Supply support for IRFH8318TRPBF 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 microcontrollers, and industrial sensors, with global manufacturing and quality certification to IATF 16949 and ISO 9001.

This part belongs to Infineon's OptiMOS™ 5 family of low-voltage power MOSFETs, engineered specifically for high-efficiency, high-frequency DC-DC conversion in datacenter, telecom, and industrial power systems.

FAQ

What is the maximum continuous drain current at 100°C case temperature?

The IRFH8318TRPBF supports 120 A continuous drain current when the bottom-case temperature is maintained at 25°C, but derates to 50 A at T_C(Bottom) = 100°C per the datasheet's absolute maximum ratings table. This reflects thermal limitation of the internal bond wires and package structure-not silicon capability-and assumes full thermal pad soldering to ≥1 in² 2-oz copper.

Does this MOSFET require a negative gate voltage for safe operation?

No. The IRFH8318TRPBF has a ±20 V V_GS rating and operates reliably with 0 V to +10 V gate drive. Negative gate bias is not required for turn-off; however, applying –5 V during off-state can reduce Miller-induced false turn-on in high-dV/dt environments such as multi-phase interleaved converters.

Can it be used in avalanche-rated applications?

Yes-its single-pulse avalanche energy E_AS is rated at 160 mJ at T_J = 25°C (ID = 20 A). This supports limited unclamped inductive switching events, such as those occurring during startup or fault conditions in buck converters. Continuous avalanche operation is not recommended due to uncontrolled junction temperature rise.

Is the PQFN 5×6 mm package compatible with standard reflow profiles?

Yes-the IRFH8318TRPBF is qualified to MSL1 per J-STD-020, meaning it may be stored indefinitely at ≤30°C/60% RH and processed using standard lead-free reflow profiles (peak 260°C, 20–40 sec above 217°C) without preconditioning or baking, provided moisture barrier bags remain sealed until use.