Infineon Technologies IRF7905TRPBF

Overview

IRF7905TRPBF from Infineon Technologies is a dual N-channel enhancement-mode HEXFET Power MOSFET in SO-8 package, configured as control FET (Q1) and synchronous rectifier FET (Q2) for DC-DC POL converters. It delivers R_DS(on) of 21.8 mΩ (Q1) and 17.1 mΩ (Q2) at V_GS = 10 V, supports 7.8 A and 8.9 A continuous drain current respectively, and features fully characterized avalanche capability (12 mJ / 18 mJ) for robust transient handling in notebook CPU VRMs.

For engineers reviewing the IRF7905TRPBF datasheet, IRF7905TRPBF pinout, IRF7905TRPBF application, or IRF7905TRPBF equivalent, key selection criteria include gate charge asymmetry (Q_g = 4.6–6.9 nC vs. 6.9–10 nC), body diode reverse recovery time (t_rr = 10–15 ns / 13–20 ns), and thermal resistance (R_θJA = 62.5 °C/W) in compact dual-SO-8 footprint.

Technical Context

This dual MOSFET integrates two independently rated N-channel devices in a single SO-8 package to enable high-efficiency synchronous buck topologies. Q1 operates as the high-side control switch with lower gate charge (4.6–6.9 nC) and higher threshold voltage stability (∆V_GS(th)/∆T_J = –5.0 mV/°C), while Q2 serves as the low-side synchronous rectifier with lower R_DS(on) (17.1 mΩ max) and higher pulsed current rating (I_DM = 71 A).

Its design targets tight-layout point-of-load regulation where gate drive timing, body diode conduction loss, and thermal coupling between channels impact efficiency. The device includes 100% RG-tested leads and improved body diode reverse recovery (Q_rr = 2.5–3.8 nC / 4.0–6.0 nC) to reduce switching losses and EMI in 500 kHz–1 MHz VRM designs.

Key Specifications

Pinout & Package

IRF7905TRPBF uses an industry-standard SO-8 surface-mount package with exposed drain pad for thermal enhancement. Pin numbering follows JEDEC MS-012AC standard (pin 1 = G1, pin 2 = S1, pin 3 = D1, pin 4 = G2, pin 5 = S2, pin 6 = D2, pin 7 = D1, pin 8 = D2). Drain pins 3/7/8 are internally connected to common thermal pad.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-N-channel synchronous buck MOSFET applications.

Compared with Si7852DP-T1-GE3 and IRF7832TRPBF, IRF7905TRPBF uniquely combines asymmetric channel optimization, guaranteed avalanche energy, and integrated thermal pad-making it the preferred choice for high-reliability, space-constrained POL converters where both switching speed and fault tolerance matter.

Availability

IRF7905TRPBF is available at Aetrix Electronics and suitable for notebook CPU VRMs, server memory regulators, graphics card GPU rails, and gaming console SoC power delivery requiring stable component supply across high-volume production cycles.

Supply support for IRF7905TRPBF 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 ICs, and industrial control solutions, with global manufacturing and quality certification to ISO/TS 16949 and IATF 16949.

The IRF7905TRPBF belongs to Infineon's HEXFET Power MOSFET product line, engineered specifically for high-frequency, high-efficiency synchronous buck converters in portable and computing applications demanding low R_DS(on), fast switching, and robust avalanche performance.

FAQ

What is the maximum recommended gate drive voltage for IRF7905TRPBF?

The absolute maximum V_GS rating is ±20 V, but the device is fully characterized and optimized for 4.5 V to 10 V drive. Operation above 10 V yields diminishing R_DS(on) improvement while increasing gate oxide stress and ESD risk; 4.5 V drive achieves 23.4 mΩ (Q1) and 17.1 mΩ (Q2), making it ideal for 5 V logic-compatible controllers.

How does the body diode performance differ between Q1 and Q2?

Q2 exhibits superior body diode characteristics: V_SD = 1.0 V (max) at I_S = 7.1 A, t_rr = 13–20 ns, and Q_rr = 4.0–6.0 nC - all tighter than Q1's 10–15 ns t_rr and 2.5–3.8 nC Q_rr. This reflects intentional process tuning for low-side synchronous rectification, reducing reverse recovery loss during freewheeling.

Can IRF7905TRPBF be used in single-ended (non-synchronous) buck topologies?

Yes - Q1 can serve as the sole active switch with external Schottky or silicon diode for freewheeling. However, Q2's optimized body diode and lower R_DS(on) make it inefficient as a standalone switch in high-current paths; its design intent is synchronous rectification, so using only Q1 forfeits half the value proposition and thermal advantages of the dual-die package.

What is the thermal pad soldering requirement for SO-8 package?

The exposed drain pad (pins 3/7/8) must be soldered to a minimum 100 mm² copper pour on the PCB's inner or outer layer, with ≥4 thermal vias (0.3 mm diameter, filled or plated) connecting to internal ground planes. This achieves the specified R_θJA = 62.5 °C/W; omitting vias or undersized copper raises junction temperature by ≥15 °C at 7 A continuous current.