Infineon Technologies IRF7834

Overview

IRF7834 from Infineon Technologies (formerly International Rectifier) is a 30V, N-channel, logic-level HEXFET Power MOSFET in SO-8 package, optimized as a synchronous rectifier FET in high-frequency DC-DC converters. It delivers 4.5 mΩ R_DS(on) at V_GS = 10 V, 29 nC total gate charge, and supports 16 A continuous drain current at T_A = 25°C - enabling high-efficiency power delivery in notebook CPU VRMs and telecom isolated converters.

For engineers reviewing the IRF7834 datasheet, IRF7834 pinout, IRF7834 application, or IRF7834 equivalent, key selection criteria include its ultra-low R_DS(on) at 4.5 V drive, fully characterized avalanche capability (25 mJ E_AS), body diode reverse recovery charge (Q_rr = 13–20 nC), and SO-8 thermal performance (R_θJA = 50 °C/W).

Technical Context

The IRF7834 is designed for synchronous rectification in non-isolated buck converters and isolated forward/flyback topologies where low conduction loss and fast switching are critical. Its gate threshold voltage (1.35–2.25 V) ensures reliable turn-on with standard 3.3 V or 5 V controller outputs, and its Q_gd/Q_gs1 ratio is minimized to suppress C_dv/dt induced shoot-through during high dV/dt node transitions.

Thermal design leverages the SO-8 package's low R_θJL (20 °C/W) to drain lead, supporting high-current pulsed operation (I_DM = 160 A). The device integrates a robust body diode with t_rr = 21–32 ns and V_SD ≤ 1.0 V at I_S = 16 A, reducing dead-time losses and improving light-load efficiency.

Key Specifications

Pinout & Package

IRF7834 is housed in a surface-mount SO-8 package with exposed drain pad for enhanced thermal performance. Pin 1–3 and 5–7 are parallel-connected drain terminals; Pin 4 is gate; Pins 6 and 8 are source terminals - enabling low-inductance, high-current source return paths.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SiR872DP and IPB040N04LG, the IRF7834 offers the best balance of low R_DS(on), moderate Q_g, and proven SO-8 manufacturability - making it ideal for cost-sensitive, high-volume computing and telecom power supplies where thermal reliability and process maturity are prioritized.

Availability

IRF7834 is available at Aetrix Electronics and suitable for notebook VRMs, telecom DC-DC converters, and industrial PoE++ PSE systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for IRF7834 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 ICs and discrete devices, with core expertise in silicon and wide-bandgap technologies.

The IRF7834 belongs to Infineon's HEXFET® Power MOSFET product line, engineered specifically for high-efficiency, high-frequency DC-DC conversion in computing, networking, and industrial power systems.

FAQ

What is the maximum junction temperature for continuous operation?

The IRF7834 has a rated maximum junction temperature (T_J) of 150°C. Continuous operation at this limit requires strict thermal design: PCB copper area ≥1 in² (2 oz), minimal trace length to ground plane, and ambient temperature ≤70°C. Derating begins above 25°C ambient at 2.5 mW/°C per watt of dissipated power.

Can IRF7834 be used as a high-side switch in a buck converter?

No - the IRF7834 is an N-channel MOSFET with no integrated bootstrap circuitry or level-shifting capability. It is optimized as a low-side or synchronous rectifier FET. For high-side switching, a dedicated high-side driver IC and appropriate gate voltage boosting (e.g., bootstrap capacitor or charge pump) are required.

Does IRF7834 require a gate resistor for stability?

Yes - a 2–10 Ω gate resistor is recommended to dampen ringing caused by gate-drain capacitance (C_rss = 350 pF) and PCB inductance. Without it, overshoot and oscillation can exceed ±20 V gate rating, risking long-term reliability degradation or catastrophic failure during fast switching.

How does its body diode performance compare to discrete Schottky diodes?

The IRF7834's integrated body diode has V_SD ≤ 1.0 V at 16 A and t_rr = 21–32 ns - slower and higher forward drop than a 40 V Schottky (typically 0.45 V, <10 ns), but sufficient for synchronous rectification when actively controlled. Its advantage lies in eliminating external diode BOM cost and footprint while enabling zero-voltage switching via precise gate timing.