Infineon Technologies IRFS7734PBF

Overview

IRFS7734PBF from Infineon Technologies (formerly International Rectifier) is a 75V, 183A N-channel enhancement-mode HEXFET® Power MOSFET in D2-Pak (TO-263) package, optimized for high-current switching in motor drives and DC/DC converters. It delivers typ. R_DS(on) = 2.8 mΩ at V_GS = 10 V, supports 650 A pulsed drain current, and features enhanced body diode dV/dt and dI/dt capability for robust synchronous rectification in half-bridge topologies.

For engineers reviewing the IRFS7734PBF datasheet, IRFS7734PBF pinout, IRFS7734PBF application, or IRFS7734PBF equivalent, key selection criteria include its 75 V V_DS rating, 2.8 mΩ on-resistance at 100 A, 180–270 nC total gate charge, avalanche energy rating of 350 mJ (single-pulse), and thermal resistance R_θJC = 0.51 °C/W - all critical for high-efficiency, thermally constrained power stage designs.

Technical Context

This MOSFET employs a trench-gated, planar silicon process with optimized cell pitch and optimized source metallization to achieve low R_DS(on) × Q_g figure-of-merit. Its gate threshold voltage (2.1–3.7 V) enables reliable turn-on with standard 5 V or 10 V logic-level drivers, while the fully characterized SOA includes both linear-mode and avalanche-limited boundaries up to T_J = 175 °C.

The device integrates a fast, soft-recovery body diode with t_rr = 47 ns (T_J = 25 °C), Q_rr = 76 nC, and peak recovery dv/dt capability of 5.1 V/ns at 175 °C - enabling stable operation in hard-switched and resonant topologies without external snubbers.

Key Specifications

Pinout & Package

D2-Pak (TO-263) package with exposed drain pad for low-inductance, high-current PCB mounting and direct thermal path to heatsink. Standard 3-pin configuration: Gate (G), Drain (D), Source (S). Pin 1 = Gate, Pin 2 = Drain (tab), Pin 3 = Source.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STL220N7F7 and IXTH180N075, IRFS7734PBF offers the best balance of low R_DS(on), proven avalanche robustness, and D2-Pak thermal interface - making it optimal for high-reliability, heatsink-mounted motor drive and OR-ing applications where board area is less constrained than thermal budget.

Availability

IRFS7734PBF is available at Aetrix Electronics and suitable for brushed motor drives, BLDC inverters, and OR-ing power switches requiring stable component supply across industrial OEM production cycles.

Supply support for IRFS7734PBF 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 power devices and system-level integration.

This device belongs to the StrongIRFET™ family of high-current HEXFET® MOSFETs, engineered specifically for demanding power conversion and motor control applications where ruggedness, low conduction loss, and repeatable avalanche performance are mandatory.

FAQ

What is the maximum recommended gate drive voltage for IRFS7734PBF?

The absolute maximum gate-to-source voltage is ±20 V, but the device is fully enhanced at V_GS = 10 V. For reliable long-term operation, gate drive should be limited to 12–15 V to avoid overstressing the oxide while maintaining low R_DS(on). Driving above 15 V provides negligible on-resistance improvement but increases gate leakage and risk of threshold shift under thermal stress.

Can IRFS7734PBF be used in parallel configurations?

Yes - its positive temperature coefficient of R_DS(on) (normalized resistance increases with junction temperature) enables inherently stable current sharing. Parallel operation requires matched gate drive loop inductance, symmetrical PCB layout, and individual gate resistors (≥5 Ω) to damp oscillation. Thermal coupling between devices must also be minimized to prevent thermal runaway.

Is the body diode suitable for continuous freewheeling in synchronous rectification?

Yes - the body diode is fully rated for continuous source current up to 183 A at T_C = 25 °C and exhibits soft, low-noise reverse recovery (t_rr = 47 ns, Q_rr = 76 nC). However, sustained freewheeling at high current requires careful thermal design, as diode conduction generates more heat than MOSFET channel conduction due to V_SD ≈ 1.2 V.

What is the minimum gate charge required to achieve full enhancement?

Full enhancement occurs at V_GS ≈ 6.0 V, where R_DS(on) drops below 4.0 mΩ. The gate-to-source charge (Q_gs) is 45 nC, and the gate-to-drain charge (Q_gd) is 55 nC. To reliably reach 10 V and maintain low R_DS(on), a total gate charge of ≥125 nC (Q_sync) must be delivered by the driver - corresponding to ~1.25 µC per 10 V transition.