Infineon Technologies IRF520N

Overview

IRF520N from Infineon Technologies (formerly International Rectifier) is a 100 V, 9.7 A N-channel enhancement-mode power MOSFET in TO-220AB package, optimized for switch-mode power supplies, motor drives, and DC-DC converters. It features 0.20 Ω R_DS(on) at V_GS = 10 V, 91 mJ single-pulse avalanche energy, and 175 °C maximum junction temperature - enabling robust operation in industrial power switching applications.

For engineers reviewing the IRF520N datasheet, IRF520N pinout, IRF520N application, or IRF520N equivalent, key selection criteria include its 100 V V_DSS, 9.7 A continuous drain current at 25 °C, TO-220 thermal resistance (R_θJC = 3.1 °C/W), fast switching (t_r = 23 ns), and full avalanche rating - critical for inductive load handling and overvoltage resilience.

Technical Context

The IRF520N employs fifth-generation HEXFET® process technology to achieve low on-resistance per die area while maintaining rugged unclamped inductive switching capability. Its gate threshold voltage (2.0–4.0 V) supports standard 10 V logic-level drive, and its dynamic dv/dt rating (5.0 V/ns) ensures reliable operation under fast transient conditions.

Designed as a discrete high-voltage power switch, it integrates a co-packaged body diode with 1.3 V forward voltage at 5.7 A and 99–150 ns reverse recovery time. The device operates across –55 °C to +175 °C junction range and is rated for repetitive avalanche energy (4.8 mJ), making it suitable for non-synchronous buck, flyback, and half-bridge topologies with moderate frequency and stress.

Key Specifications

Pinout & Package

IRF520N is housed in a through-hole TO-220AB package with isolated tab (drain-connected). The package provides low thermal resistance and mechanical stability for board-mounted power switching, compatible with standard TO-220 heatsinks and mounting hardware (6-32/M3 screw, 10 lbf·in torque).

Key Features

Applications

Equivalent & Alternatives

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

Compared with STP10NK60Z and FQP30N06L, the IRF520N occupies a mid-voltage niche: it delivers superior conduction efficiency vs. high-voltage MOSFETs and greater voltage margin vs. low-voltage logic devices - ideal for 24–100 V industrial power switching where 100 V headroom and TO-220 thermal performance are decisive.

Availability

IRF520N is available at Aetrix Electronics and suitable for DC motor control, switch-mode power supplies, LED drivers, and AC/DC adapters requiring stable component supply and long-term industrial availability.

Supply support for IRF520N 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 headquartered in Munich, Germany, specializing in power management, automotive, and industrial control ICs and discrete devices.

The IRF520N belongs to Infineon's legacy HEXFET® power MOSFET product line, engineered for high-reliability, medium-power switching in commercial and industrial equipment where ruggedness, thermal performance, and proven avalanche capability are essential.

FAQ

Is the IRF520N suitable for 5 V microcontroller gate drive?

No - the IRF520N has a gate threshold voltage range of 2.0–4.0 V and requires ≥10 V V_GS to achieve its specified 0.20 Ω R_DS(on). At 5 V, R_DS(on) rises significantly (>1 Ω), causing excessive conduction loss and thermal stress. A logic-level MOSFET like FQP30N06L or dedicated gate driver is required for 5 V control.

What is the maximum continuous power dissipation for IRF520N without a heatsink?

Without a heatsink, the IRF520N is limited by its R_θJA = 62 °C/W. At 25 °C ambient, maximum allowable power is (175 − 25) °C ÷ 62 °C/W ≈ 2.4 W. This corresponds to ~2.2 A continuous current at 0.20 Ω R_DS(on). For >5 W operation, a heatsink is mandatory.

Does the IRF520N require a gate resistor, and what value is recommended?

Yes - a gate resistor controls switching speed and suppresses ringing. For general-purpose switching at ≤100 kHz, a 10–22 Ω resistor between driver and gate is typical. Lower values (≤10 Ω) increase dI/dt and EMI risk; higher values (>47 Ω) slow switching and raise losses. Layout-dependent parasitic inductance also influences optimal value.

Can the IRF520N replace the IRF540N in an existing design?

Only with verification - the IRF540N has higher current (33 A) and lower R_DS(on) (0.044 Ω), so substituting IRF520N (9.7 A, 0.20 Ω) may cause thermal overload or insufficient current delivery. It is not a drop-in replacement; redesign of thermal management, gate drive, and current-limiting circuitry is required if used as a lower-cost alternative.