Vishay Siliconix IRFI840GLCPBF

Overview

IRFI840GLCPBF from Vishay Siliconix is a 500 V, 4.5 A N-channel power MOSFET in TO-220 FULLPAK package, featuring 0.85 Ω R_DS(on) at V_GS = 10 V, 39 nC total gate charge, and 2.5 kV_RMS isolation rating. It serves as a high-voltage switching element in offline SMPS, AC-DC adapters, and industrial motor controls where ruggedness and avalanche capability are critical.

For engineers reviewing the IRFI840GLCPBF datasheet, IRFI840GLCPBF pinout, IRFI840GLCPBF application, or IRFI840GLCPBF equivalent, key selection criteria include its isolated TO-220 FULLPAK package eliminating external insulation, ±30 V gate rating enabling robust drive margin, repetitive avalanche rating (4.5 A), and low Q_gd/Q_g ratio supporting efficient hard-switching topologies.

Technical Context

This device employs advanced planar VDMOS technology optimized for high-voltage switching with enhanced gate oxide reliability and reduced Miller capacitance. Its 19 nC Q_gd and 1100 pF C_iss support controlled dV/dt during turn-off while maintaining fast 12 ns turn-on delay and 19 ns fall time under standard test conditions (V_DD = 250 V, I_D = 8.0 A, R_G = 9.1 Ω).

The TO-220 FULLPAK construction integrates a molded insulating barrier between drain tab and leads, achieving 4.8 mm creepage and 2.5 kV_RMS isolation per 60 s at 60 Hz. Thermal resistance of 3.1 °C/W (junction-to-case) enables 40 W continuous dissipation at T_C = 25 °C without derating.

Key Specifications

Pinout & Package

IRFI840GLCPBF uses the TO-220 FULLPAK package: insulated plastic body with integral drain tab, 3-pin through-hole configuration, 15.87 mm length, 10.10 mm width, and 4.70 mm height. The drain tab is electrically isolated from leads, enabling direct heatsink mounting without mica washers.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STP5NK50ZFP and FQP5N50CTU, the IRFI840GLCPBF uniquely combines certified 2.5 kV_RMS isolation, repetitive avalanche capability, and ultra-low Q_gd, making it the only option among the three qualified for reinforced-insulation flyback converters without additional safety components.

Availability

IRFI840GLCPBF is available at Aetrix Electronics and suitable for AC-DC power adapters, industrial motor drives, and LED street lighting drivers requiring stable component supply across extended production lifecycles.

Supply support for IRFI840GLCPBF 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 high-reliability MOSFETs, diodes, and optoelectronics for demanding power and signal applications.

The IRFI840GLCPBF belongs to Vishay's high-voltage isolated MOSFET product line, engineered specifically for offline switch-mode power supplies needing reinforced insulation, avalanche robustness, and thermal efficiency in compact form factors.

FAQ

What is the maximum continuous drain current for IRFI840GLCPBF at 100 °C case temperature?

The IRFI840GLCPBF supports 2.9 A continuous drain current at T_C = 100 °C, as specified in the Absolute Maximum Ratings table. This derating reflects thermal limitations of the TO-220 FULLPAK package; designers must ensure heatsink interface resistance remains ≤0.8 °C/W to maintain junction temperature below 150 °C under full load.

Does IRFI840GLCPBF require external gate resistors for EMI control?

Yes, IRFI840GLCPBF benefits from an external gate resistor (typically 10–47 Ω) to dampen ringing caused by parasitic inductance in the gate loop. Its 0.7–3.7 Ω intrinsic gate resistance is insufficient alone; adding a series resistor reduces dI/dt during turn-on and suppresses oscillation that could exceed the 3.5 V/ns dV/dt rating.

Can IRFI840GLCPBF be used in synchronous rectification topologies?

No, IRFI840GLCPBF is not suitable for synchronous rectification due to its body diode recovery characteristics: trr = 490–740 ns and Q_rr = 3.0–4.5 μC. These values cause significant reverse recovery loss when used as a low-side switch; dedicated synchronous rectifier MOSFETs with faster trr (<100 ns) and lower Q_rr are required instead.

What is the creepage distance between drain tab and leads on IRFI840GLCPBF?

The sink-to-lead creepage distance for IRFI840GLCPBF is 4.8 mm, as confirmed in the Features section of the datasheet. This value satisfies IPC-2221 Class B spacing requirements for 277 V AC systems and supports reinforced insulation per IEC 62368-1 when mounted on a grounded heatsink.

Is IRFI840GLCPBF lead (Pb)-free and RoHS compliant?

Yes, IRFI840GLCPBF is lead-free and RoHS compliant, as indicated by the "PbF" suffix in its ordering code and confirmed in Vishay's material categorization documentation (www.vishay.com/doc?99912). The device meets EU Directive 2011/65/EU and associated exemptions for high-melting-point solder alloys.