Vishay Siliconix IRL520PBF

Overview

IRL520PBF from Vishay Siliconix is a logic-level N-channel power MOSFET in TO-220AB package, rated for 100 V V_DS, 9.4 A continuous drain current at T_C = 25 °C, and 0.27 Ω R_DS(on) at V_GS = 5 V. It supports fast switching, repetitive avalanche operation, and ease of paralleling in DC-DC converters and motor control circuits.

For engineers reviewing the IRL520PBF datasheet, IRL520PBF pinout, IRL520PBF application, or IRL520PBF equivalent, key selection criteria include its logic-level gate drive (V_GS(th) = 1.0–2.0 V), low R_DS(on) at 4–5 V, avalanche energy rating (E_AS = 85 mJ), and TO-220AB thermal performance (R_thJC = 2.5 °C/W).

Technical Context

This device belongs to Vishay's third-generation power MOSFET family optimized for high-efficiency, medium-voltage switching. Its design integrates ruggedized die construction with low gate charge (Q_g = 12 nC) and low output capacitance (C_oss = 75 pF), enabling efficient operation in hard-switched topologies up to ~100 kHz.

The IRL520PBF features a built-in body diode with t_rr = 130–190 ns and Q_rr = 0.8–1.3 μC, supporting synchronous rectification and inductive load commutation. Its dynamic dV/dt rating (5.0 V/ns) and repetitive avalanche capability (I_AR = 9.4 A) allow robust operation under transient overvoltage and unclamped inductive switching conditions.

Key Specifications

Pinout & Package

IRL520PBF uses the industry-standard TO-220AB package with isolated tab (drain-connected), offering low thermal resistance (R_thJC = 2.5 °C/W) and mechanical compatibility with existing heatsink mounts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STP10NK50ZFP and IRF520NPBF, the IRL520PBF delivers guaranteed logic-level operation, lower gate charge, and superior dV/dt immunity-making it optimal for space-constrained, low-voltage, microcontroller-driven switching where gate drive simplicity and transient robustness are critical.

Availability

IRL520PBF is available at Aetrix Electronics and suitable for DC-DC converters, motor drivers, LED drivers, and AC-DC secondary-side switching requiring stable component supply, RoHS-compliant packaging, and long-term industrial availability.

Supply support for IRL520PBF 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

Vishay Intertechnology is a global manufacturer of discrete semiconductors and passive components, headquartered in Malvern, PA, with vertical fabrication and testing capabilities across Asia, Europe, and the Americas.

The IRL520PBF belongs to Vishay Siliconix's logic-level power MOSFET product line, engineered specifically for high-efficiency, low-voltage switching in space- and thermal-constrained applications such as portable equipment, industrial controls, and distributed power architectures.

FAQ

What is the maximum continuous drain current rating for IRL520PBF at 100 °C case temperature?

The IRL520PBF supports 5.8 A continuous drain current at T_C = 100 °C, derived from its linear derating factor of 0.067 W/°C and 50 W P_D rating at 25 °C. This value reflects real-world thermal limits when mounted on a standard TO-220 heatsink with thermal interface material. Designers should verify junction temperature using R_thJC = 2.5 °C/W and actual power dissipation in IRL520PBF-based circuits.

Is IRL520PBF suitable for direct drive from a 3.3 V microcontroller GPIO pin?

Yes, the IRL520PBF is explicitly designed for logic-level operation with V_GS(th) specified from 1.0 V to 2.0 V and R_DS(on) guaranteed at V_GS = 4 V and 5 V. At 3.3 V, it achieves partial enhancement sufficient for many low-duty-cycle or low-current applications; for full 9.4 A conduction, 4–5 V drive is recommended. The IRL520PBF datasheet confirms stable operation down to 4 V, making it more robust than standard MOSFETs like IRF520NPBF in 3.3 V systems.

Does IRL520PBF have avalanche capability, and how is it rated?

Yes, the IRL520PBF is repetitively avalanche rated per Vishay's test conditions: I_AR = 9.4 A and E_AR = 4.5 mJ (repetitive), with single-pulse E_AS = 85 mJ. These ratings are validated using unclamped inductive switching (UIS) tests at T_J = 25 °C with defined L, R_g, and pulse width limits. This makes IRL520PBF suitable for inductive load switching without external snubbers, provided layout minimizes stray inductance.

What is the thermal resistance from junction to case (R_thJC) for IRL520PBF, and how does it impact heatsink selection?

The IRL520PBF has a maximum junction-to-case thermal resistance (R_thJC) of 2.5 °C/W, measured from die to TO-220AB drain tab. This low value enables effective heat transfer to an external heatsink, allowing 50 W power dissipation with modest thermal interface resistance. When designing with IRL520PBF, heatsink selection should target total R_thJA < 20 °C/W for ambient operation up to 70 °C, assuming 0.5 °C/W compound resistance and 1.5 °C/W heatsink resistance.

How does the body diode performance of IRL520PBF compare to discrete Schottky diodes in synchronous rectification?

The IRL520PBF body diode offers t_rr = 130–190 ns and Q_rr = 0.8–1.3 μC at I_F = 9.4 A, which is slower and higher-charge than most Schottky diodes-but its integrated nature eliminates layout parasitics and reduces component count. In low-frequency (<100 kHz) synchronous rectifiers, the IRL520PBF's R_DS(on) provides lower forward conduction loss than a 0.5 V Schottky at currents >3 A. For IRL520PBF designs, optimizing gate timing to minimize body diode conduction time is essential to leverage this advantage.