Vishay Siliconix IRF540

Overview

IRF540 from Vishay Siliconix is a 100 V, 28 A N-channel power MOSFET in TO-220AB package, featuring 0.077 Ω R_DS(on) at V_GS = 10 V, 72 nC total gate charge, and 175 °C maximum junction temperature-designed for DC-DC converters, motor drives, and switch-mode power supplies.

For engineers reviewing the IRF540 datasheet, IRF540 pinout, IRF540 application, or IRF540 equivalent, key selection criteria include avalanche ruggedness (230 mJ single-pulse), fast switching (11 ns turn-on delay), dynamic dV/dt rating (5.5 V/ns), and ease of paralleling due to positive temperature coefficient of R_DS(on).

Technical Context

The IRF540 employs a third-generation planar vertical DMOS structure optimized for low conduction loss and robust unclamped inductive switching. Its gate threshold voltage (2.0–4.0 V) enables standard logic-level drive, while its 1700 pF input capacitance and 120 pF reverse transfer capacitance support predictable gate timing with 9.1 Ω external gate resistor.

Thermally, it delivers 150 W maximum power dissipation at T_C = 25 °C with 1.0 °C/W junction-to-case thermal resistance. The integral body diode exhibits 180–360 ns reverse recovery time and 2.5 V forward drop at 28 A, enabling synchronous rectification and freewheeling in hard-switched topologies.

Key Specifications

Pinout & Package

TO-220AB package with isolated tab (drain-connected), 3-pin through-hole mounting, 1.0 °C/W junction-to-case thermal resistance, and 62 °C/W junction-to-ambient (no heatsink).

Key Features

Applications

Equivalent & Alternatives

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

Compared with STP10NK60ZFP and FQP30N06L, the IRF540 offers optimal balance of 100 V rating, 28 A current capability, and rugged avalanche performance-making it the default choice for 48 V motor drives and mid-power DC-DC where reliability under transient overload is critical.

Availability

IRF540 is available at Aetrix Electronics and suitable for DC-DC converters, brushed DC motor drives, and AC-DC PFC front-ends requiring stable component supply across multi-year production cycles.

Supply support for IRF540 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 Siliconix is a global leader in discrete semiconductors, specializing in power MOSFETs, diodes, and optoelectronics with emphasis on ruggedness, thermal performance, and industrial reliability.

The IRF540 belongs to Vishay's third-generation power MOSFET family engineered for high-current, medium-voltage switching in commercial and industrial power conversion-prioritizing avalanche ruggedness, ease of paralleling, and cost-effective TO-220 packaging.

FAQ

What is the maximum continuous drain current for the IRF540 at 100 °C case temperature?

The IRF540 supports 20 A continuous drain current at T_C = 100 °C, per its absolute maximum ratings table. This derating reflects thermal limits of the TO-220AB package and ensures safe operation within the 175 °C maximum junction temperature. At 25 °C case temperature, the IRF540 delivers 28 A continuous current. Designers must verify heatsink sizing using R_thJC = 1.0 °C/W and ambient conditions.

Does the IRF540 require a gate driver IC, or can it be driven directly from a microcontroller GPIO?

The IRF540 has a gate threshold voltage of 2.0–4.0 V and total gate charge of 72 nC, making direct microcontroller GPIO drive possible only at low frequencies (<10 kHz) and low duty cycles. For reliable 100+ kHz switching, a dedicated gate driver (e.g., TC4420 or MCP1407) is recommended to ensure full 10 V gate enhancement and minimize switching losses. The IRF540's gate input resistance (0.5–3.6 Ω) also necessitates low-impedance drive to avoid ringing.

Is the IRF540PbF-BE3 variant pin-compatible with legacy IRF540 versions?

Yes, the IRF540PbF-BE3 is a direct form-fit-function replacement for all prior IRF540 variants-including IRF540NPbF and non-RoHS IRF540-in TO-220AB package. It retains identical pinout (G-D-S), electrical specifications, thermal characteristics, and mechanical dimensions. The "BE3" suffix denotes halogen-free construction and enhanced moisture sensitivity level (MSL 1), with no impact on circuit design or PCB layout.

What is the body diode reverse recovery charge (Q_rr) of the IRF540, and why does it matter in bridge configurations?

Q_rr for the IRF540 is 1.3–2.8 μC at T_J = 25 °C, IF = 17 A, and dI/dt = 100 A/μs. In half-bridge or full-bridge topologies, this stored charge must be removed before the complementary device turns on-causing brief shoot-through current and increased switching loss. High Q_rr values demand careful dead-time tuning and may limit maximum operating frequency; the IRF540's Q_rr is typical for standard VDMOS and acceptable up to ~300 kHz with proper gate control.

Can the IRF540 be used in parallel for higher current applications, and what precautions are needed?

Yes, the IRF540 is explicitly designed for paralleling, supported by its positive R_DS(on) temperature coefficient and low gate charge variation. To ensure balanced current sharing: use matched gate resistors (≤1 Ω tolerance), symmetrical PCB layout with equal trace lengths, common-source Kelvin connection, and individual gate resistors (not shared). Thermal coupling via a shared heatsink is essential-uneven heating causes current hogging. The IRF540's datasheet confirms ease of paralleling as a core feature.