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Home > Products > Discrete Semiconductor Products > Transistors > FETs, MOSFETs > FETs, MOSFETs

Vishay Siliconix IRF720L

Name: IRF720L
Brand: Vishay Siliconix
SKU: IRF720L
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: IRF720L

Manufacturer:: Vishay Siliconix

Category:: FETs, MOSFETs

Package:: TO-262-3 Long Leads, I2PAK, TO-262AA

Datasheet:: IRF720L.pdf

Description:: MOSFET N-CH 400V 3.3A I2PAK

Quantity:: RFQ Add To RFQ list

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Product details

Overview

IRF720L from Vishay Siliconix is a 400 V, 3.3 A N-channel power MOSFET in D2PAK (TO-263) surface-mount package, featuring 1.8 Ω R_DS(on) at V_GS = 10 V, 20 nC total gate charge, and repetitive avalanche rating-designed for high-voltage DC-DC converters, motor control snubbers, and AC solid-state relay drivers.

For engineers reviewing the IRF720L datasheet, IRF720L pinout, IRF720L application, or IRF720L equivalent, this page delivers verified electrical parameters, thermal derating behavior, body diode recovery characteristics, and direct alternative part comparisons to support high-reliability power stage design and BOM continuity planning.

Technical Context

The IRF720L employs a third-generation planar vertical DMOS structure optimized for ruggedness and fast switching in high-voltage, moderate-current applications. Its 400 V V_DS rating supports operation across 230 VAC rectified rails and flyback primary-side topologies, while its 190 mJ single-pulse avalanche energy enables unclamped inductive switching without external clamping.

Thermal performance is defined by R_thJC = 2.5 °C/W (junction-to-case) and R_thJA = 40 °C/W (PCB mount), with linear derating of 0.025 W/°C above 25 °C ambient-making it suitable for thermally constrained surface-mount layouts where heatsinking is limited to copper area on FR-4.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	400 V - Supports 230 VAC mains-derived bus voltages with ≥20 % margin
R_DS(on)	1.8 Ω @ V_GS = 10 V - Enables <1.2 W conduction loss at 3.3 A continuous drain current
Q_g	20 nC - Requires ≤1.0 W gate drive power at 100 kHz switching with 10 V swing
I_D (T_C = 100 °C)	2.1 A - Defines maximum sustained current under typical PCB-mounted thermal conditions
E_AS	190 mJ - Allows safe operation in unclamped inductive turn-off events up to 3.3 A
trr / Q_rr	270 ns / 1.4–3.0 μC - Determines reverse recovery loss and EMI in hard-switched topologies
P_D (T_C = 25 °C)	50 W - Specifies maximum dissipation with active case heatsinking

Pinout & Package

D2PAK (TO-263) surface-mount package with exposed drain tab for thermal and electrical connection; 3-pin configuration (G, D, S) with drain tab electrically tied to pin 2 (Drain).

Pin/Terminal	Circuit Role	Design Meaning
G (Gate)	Control electrode	Receives 10 V logic-level drive; input capacitance C_iss = 410 pF dictates gate resistor selection for dv/dt control
D (Drain)	High-side switch node	Connected to exposed metal tab; carries full load current and must be routed over large copper pour for thermal management
S (Source)	Reference node	Common return path for load current and gate drive loop; internal source inductance L_S = 7.5 nH affects switching waveform ringing

Key Features

Feature	Design Value
Repetitive avalanche rated	Enables reliable operation in inductive load switching without external snubbers or clamps
Dynamic dv/dt rating	4.0 V/ns - Confirmed immunity to false turn-on during high-speed voltage transients
Fast switching	td(on)/tr/td(off)/tf = 10/14/30/13 ns - Reduces switching losses in 50–200 kHz power stages
Low R_DS(on) × Q_g figure-of-merit	36 Ω·nC - Balances conduction and switching loss trade-offs in medium-frequency SMPS
RoHS-compliant lead-free option	SiHF720L-GE3 variant available - Meets global environmental compliance requirements without performance compromise

Applications

Switch-Mode Power Supply (SMPS)	Motor Control Snubber
Use Scenario: Primary-side switch in 20–60 W offline flyback converter operating from 85–265 VAC input. IC Role / Device Role / Timing Role: High-voltage N-channel MOSFET performing main power switching at 65–100 kHz. Use Value: 400 V V_DS and 190 mJ E_AS ensure robustness against reflected output voltage spikes and transformer leakage inductance energy.	Use Scenario: RC snubber clamp across brushed DC motor terminals to suppress commutation arcs. IC Role / Device Role / Timing Role: Avalanche-rated power switch absorbing inductive kickback during motor current interruption. Use Value: Repetitive avalanche capability allows repeated energy absorption without degradation-eliminating need for external TVS or Zener clamps.
AC Solid-State Relay (SSR)	High-Voltage DC Link Protection
Use Scenario: Back-to-back configured pair driving resistive/heating loads in industrial SSR modules. IC Role / Device Role / Timing Role: Bidirectional blocking switch replacing electromechanical relays in 240 VAC systems. Use Value: 400 V V_DS provides >60 % safety margin over peak 240 VAC (339 V), enabling long-term reliability in zero-crossing switched loads.	Use Scenario: Crowbar device triggered during overvoltage fault on 375 V DC bus in PFC+LLC system. IC Role / Device Role / Timing Role: Fast-acting short-circuit element diverting bus current to ground upon fault detection. Use Value: Low R_DS(on) (1.8 Ω) ensures rapid bus collapse (<100 µs) while sustaining 13 A pulsed current per avalanche rating.

Switch-Mode Power Supply (SMPS)

Motor Control Snubber

Use Scenario: Primary-side switch in 20–60 W offline flyback converter operating from 85–265 VAC input.

IC Role / Device Role / Timing Role: High-voltage N-channel MOSFET performing main power switching at 65–100 kHz.

Use Value: 400 V V_DS and 190 mJ E_AS ensure robustness against reflected output voltage spikes and transformer leakage inductance energy.

Use Scenario: RC snubber clamp across brushed DC motor terminals to suppress commutation arcs.

IC Role / Device Role / Timing Role: Avalanche-rated power switch absorbing inductive kickback during motor current interruption.

Use Value: Repetitive avalanche capability allows repeated energy absorption without degradation-eliminating need for external TVS or Zener clamps.

AC Solid-State Relay (SSR)

High-Voltage DC Link Protection

Use Scenario: Back-to-back configured pair driving resistive/heating loads in industrial SSR modules.

IC Role / Device Role / Timing Role: Bidirectional blocking switch replacing electromechanical relays in 240 VAC systems.

Use Value: 400 V V_DS provides >60 % safety margin over peak 240 VAC (339 V), enabling long-term reliability in zero-crossing switched loads.

Use Scenario: Crowbar device triggered during overvoltage fault on 375 V DC bus in PFC+LLC system.

IC Role / Device Role / Timing Role: Fast-acting short-circuit element diverting bus current to ground upon fault detection.

Use Value: Low R_DS(on) (1.8 Ω) ensures rapid bus collapse (<100 µs) while sustaining 13 A pulsed current per avalanche rating.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
IRF720SPbF	D2PAK package, identical V_DS, R_DS(on), Q_g, and avalanche ratings; Pb-containing terminations	Same thermal and electrical performance; not RoHS-compliant	Select when legacy Pb-based assembly processes or extended temperature qualification require non-RoHS construction
SiHF720L-GE3	Identical D2PAK footprint and electrical specs; halogen-free, RoHS-compliant, green packaging	Drop-in replacement for IRF720L with enhanced environmental compliance	Preferred for new designs requiring RoHS/REACH compliance and supply chain sustainability

Compared with IRF720L, IRF720SPbF offers identical performance but lacks RoHS compliance, while SiHF720L-GE3 delivers full regulatory alignment without sacrificing ruggedness or thermal capability-making it the recommended upgrade path for production programs targeting global markets.

Availability

IRF720L is available at Aetrix Electronics and suitable for high-voltage DC-DC converters, motor control snubbers, and AC solid-state relay drivers requiring stable component supply and long-term industrial lifecycle support.

Supply support for IRF720L 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 power MOSFETs, diodes, and optoelectronics for industrial, automotive, and computing applications.

The IRF720L belongs to Vishay's third-generation high-voltage power MOSFET family, engineered for rugged switching in cost-sensitive, thermally constrained power conversion systems where avalanche tolerance and surface-mount scalability are critical.

FAQ

What is the maximum continuous drain current for IRF720L at 100 °C case temperature?

The IRF720L supports 2.1 A continuous drain current at T_C = 100 °C, as specified in the Absolute Maximum Ratings table. This value reflects linear derating from 3.3 A at 25 °C using the 0.40 W/°C factor, and assumes proper PCB copper area for thermal conduction. Exceeding this current without additional heatsinking risks junction temperature exceeding 150 °C.

Does IRF720L have a built-in body diode, and what are its key recovery characteristics?

Yes, the IRF720L integrates a body diode with 3.3 A continuous forward current rating. Its reverse recovery time (t_rr) is 270 ns (typical) at T_J = 25 °C, I_F = 3.3 A, and di/dt = 100 A/μs, and reverse recovery charge (Q_rr) ranges from 1.4 to 3.0 μC. These values directly impact switching loss and EMI in hard-commutated circuits like flyback snubbers or synchronous rectifier alternatives.

Is IRF720L suitable for logic-level gate drive, or does it require 10 V?

The IRF720L is not a logic-level MOSFET; its gate threshold voltage (V_GS(th)) ranges from 2.0 V to 4.0 V, but full enhancement requires V_GS = 10 V to achieve the specified 1.8 Ω R_DS(on). Driving it with 5 V will result in significantly higher on-resistance (>5 Ω) and excessive conduction loss-so a 10 V gate driver is mandatory for rated performance.

How does the avalanche rating of IRF720L compare between single-pulse and repetitive conditions?

The IRF720L is rated for 190 mJ single-pulse avalanche energy (E_AS) under defined test conditions, and 5.0 mJ repetitive avalanche energy (E_AR). The repetitive rating applies to continuous operation with pulse width limited by junction temperature rise, making it suitable for cyclic inductive switching in motor drives-but not for sustained fault conditions. Designers must verify thermal limits using Fig. 11 transient impedance curves.

What is the thermal resistance from junction to ambient for IRF720L in standard PCB mount?

When mounted on a 1" square FR-4 PCB, the IRF720L has a maximum junction-to-ambient thermal resistance (R_thJA) of 40 °C/W, per the Thermal Resistance Ratings table. This value assumes no external heatsink and defines the worst-case thermal path for layout validation. For higher power operation, the exposed drain tab must be connected to ≥25 cm² of 2-oz copper with multiple thermal vias to reduce effective R_thJA.

IRF720L Specifications

Product attributes: Attribute value

Manufacturer:: Vishay Siliconix

Series:: -

Package/Case:: TO-262-3 Long Leads, I2PAK, TO-262AA

Packaging:: Tube

Product Status:: Obsolete

FET Type:: N-Channel

Technology:: MOSFET (Metal Oxide)

Drain to Source Voltage (Vdss):: 400 V

Current - Continuous Drain (Id) @ 25°C:: 3.3A (Tc)

Drive Voltage (Max Rds On, Min Rds On):: 10V

Rds On (Max) @ Id, Vgs:: 1.8Ohm @ 2A, 10V

Vgs(th) (Max) @ Id:: 4V @ 250µA

Gate Charge (Qg) (Max) @ Vgs:: 20 nC @ 10 V

Vgs (Max):: ±20V

Input Capacitance (Ciss) (Max) @ Vds:: 410 pF @ 25 V

FET Feature:: -

Power Dissipation (Max):: 3.1W (Ta), 50W (Tc)

Operating Temperature:: -55°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: I2PAK

IRF720L FAQ

1.How can I place an order for IRF720L through Aetrix?

Please submit a Request for Quotation (RFQ) for IRF720L on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for IRF720L reliable?

The price and inventory of IRF720L are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IRF720L is usually 5 days.

3.What payment methods are accepted for IRF720L?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IRF720L transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for IRF720L?

IRF720L orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your IRF720L order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for IRF720L?

For technical support, including IRF720L datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IRF720L requirements.

6.How does Aetrix verify that IRF720L is sourced from the original manufacturer or authorized distributors?

All IRF720L products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that IRF720L meets industry standards.

7.What is the process for return or replacement of IRF720L?

All IRF720L units undergo pre-shipment inspection (PSI). If there is an issue with IRF720L, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The IRF720L part is unused and in its original packaging.

Return procedure for IRF720L:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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