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

Vishay Siliconix IRF740ASTRL

Name: IRF740ASTRL
Brand: Vishay Siliconix
SKU: IRF740ASTRL
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: IRF740ASTRL

Manufacturer:: Vishay Siliconix

Category:: FETs, MOSFETs

Package:: TO-263-3, D2PAK (2 Leads + Tab), TO-263AB

Datasheet:: IRF740ASTRL.pdf

Description:: MOSFET N-CH 400V 10A D2PAK

Quantity:: RFQ Add To RFQ list

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Product details

Overview

IRF740ASTRL from Vishay Siliconix is a 400 V, 10 A, N-channel enhancement-mode power MOSFET in D2PAK (TO-263) package, featuring 0.55 Ω R_DS(on) at V_GS = 10 V, 36 nC total gate charge, and 630 mJ single-pulse avalanche energy - designed for high-voltage switching in flyback and forward SMPS topologies.

For engineers reviewing the IRF740ASTRL datasheet, IRF740ASTRL pinout, IRF740ASTRL application, or IRF740ASTRL equivalent, this part supports stable high-dV/dt operation (5.9 V/ns), offers fully characterized C_oss and Q_gd, and delivers rugged unclamped inductive switching performance up to 10 A avalanche current.

Technical Context

This device uses planar stripe silicon technology optimized for high-voltage blocking and fast switching in hard-switched converters. Its gate threshold voltage (2.0–4.0 V) ensures reliable turn-on with standard 10 V gate drivers while maintaining low leakage (≤25 μA at 400 V).

The MOSFET integrates a robust body diode with 240–360 ns reverse recovery time and 1.9–2.9 μC Q_rr, enabling operation in topologies requiring freewheeling conduction. Thermal resistance of 1.0 °C/W (junction-to-case) supports high-power dissipation when mounted on PCB copper areas per Vishay's recommended 0.420" × 0.355" pad layout.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	400 V - supports primary-side switching in universal-input SMPS up to 320 V DC bus
R_DS(on)	0.55 Ω @ V_GS = 10 V - enables ≤5.5 W conduction loss at 10 A continuous drain current
Q_g	36 nC - determines gate drive power requirement and switching speed in 100–500 kHz converters
E_AS	630 mJ - allows safe operation under unclamped inductive load conditions without snubber
dV/dt Rating	5.9 V/ns - sustains high dv/dt noise immunity during transformer reset transitions
T_J Range	–55 to +150 °C - qualified for industrial ambient and thermally stressed PCB layouts
C_{oss eff.}	61 pF - defines output capacitance energy loss during zero-voltage switching transitions

Pinout & Package

D2PAK (TO-263) surface-mount package with exposed drain thermal pad; 3-pin configuration optimized for high-current, high-voltage PCB mounting and thermal management.

Pin/Terminal	Circuit Role	Design Meaning
G (Gate)	Control input	Receives 10 V logic-level signal to fully enhance channel; 9.9 nC Q_gs defines Miller plateau timing
D (Drain)	High-voltage power output	Connected to transformer primary or DC bus; electrically tied to thermal pad for heat sinking
S (Source)	Power return / reference	Provides ground reference for gate drive and current sensing; body diode anode

Key Features

Feature	Design Value
Low Q_g/Q_gd ratio	36 nC total / 16 nC gate-drain charge - reduces Miller-induced switching delay and improves EMI control
Fully characterized C_iss/C_oss/C_rss	1030 pF / 170 pF / 7.7 pF at 25 V - enables accurate loss modeling in resonant and hard-switched designs
Avalanche-rated construction	10 A I_AR, 630 mJ E_AS - eliminates need for external clamping in flyback transformer reset
Enhanced dV/dt ruggedness	5.9 V/ns rated - prevents false turn-on during high-slew-rate switching node transitions
RoHS-compliant Pb-free variant	IRF740ASTRLPbFa marking - meets EU Directive 2011/65/EU without lead finish

Applications

Switch Mode Power Supply (SMPS)	Uninterruptible Power Supply (UPS)
Use Scenario: Primary-side switch in 100–500 W offline flyback converter with US/Universal AC input. IC Role / Device Role / Timing Role: High-voltage power switch controlling energy transfer via transformer primary winding during PWM on-time. Use Value: 400 V V_DS rating accommodates reflected output voltage plus leakage spike; 630 mJ E_AS handles transformer reset without snubber.	Use Scenario: Inverter-stage switching device in line-interactive UPS delivering 500–1000 VA output. IC Role / Device Role / Timing Role: DC-link switch modulating battery-derived DC into clean sine-wave AC output via H-bridge or half-bridge topology. Use Value: 10 A continuous ID and 125 W P_D support sustained conduction; body diode t_rr < 360 ns minimizes cross-conduction losses.
Industrial Motor Drive	LED Driver Power Stage
Use Scenario: Low-frequency (<10 kHz) DC bus switch in brushless DC motor phase-leg driver. IC Role / Device Role / Timing Role: High-side or low-side power switch controlling current flow through motor windings during commutation. Use Value: Avalanche rating protects against inductive kickback during forced commutation; R_DS(on) = 0.55 Ω limits I²R heating at 6.3 A derated current.	Use Scenario: Constant-current buck regulator switch driving high-power LED strings from 300–400 V DC bus. IC Role / Device Role / Timing Role: Main power switch regulating average LED current via PWM duty cycle in primary-side controlled topology. Use Value: 0.55 Ω R_DS(on) enables >95% efficiency at 10 A; low Q_g supports 100+ kHz switching for minimal output ripple.

Switch Mode Power Supply (SMPS)

Uninterruptible Power Supply (UPS)

Use Scenario: Primary-side switch in 100–500 W offline flyback converter with US/Universal AC input.

IC Role / Device Role / Timing Role: High-voltage power switch controlling energy transfer via transformer primary winding during PWM on-time.

Use Value: 400 V V_DS rating accommodates reflected output voltage plus leakage spike; 630 mJ E_AS handles transformer reset without snubber.

Use Scenario: Inverter-stage switching device in line-interactive UPS delivering 500–1000 VA output.

IC Role / Device Role / Timing Role: DC-link switch modulating battery-derived DC into clean sine-wave AC output via H-bridge or half-bridge topology.

Use Value: 10 A continuous ID and 125 W P_D support sustained conduction; body diode t_rr < 360 ns minimizes cross-conduction losses.

Industrial Motor Drive

LED Driver Power Stage

Use Scenario: Low-frequency (<10 kHz) DC bus switch in brushless DC motor phase-leg driver.

IC Role / Device Role / Timing Role: High-side or low-side power switch controlling current flow through motor windings during commutation.

Use Value: Avalanche rating protects against inductive kickback during forced commutation; R_DS(on) = 0.55 Ω limits I²R heating at 6.3 A derated current.

Use Scenario: Constant-current buck regulator switch driving high-power LED strings from 300–400 V DC bus.

IC Role / Device Role / Timing Role: Main power switch regulating average LED current via PWM duty cycle in primary-side controlled topology.

Use Value: 0.55 Ω R_DS(on) enables >95% efficiency at 10 A; low Q_g supports 100+ kHz switching for minimal output ripple.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STP4NK40ZFP	400 V, 3.5 A, 1.2 Ω R_DS(on), TO-220FP package	Lower current rating and higher on-resistance; requires heatsink for >2 A continuous	Choose for cost-sensitive, lower-power (<100 W) SMPS where board space permits through-hole mounting
IXTP4N50D2	500 V, 4 A, 1.4 Ω R_DS(on), TO-220 package, ultra-low Q_g (12 nC)	Higher voltage rating but lower current; optimized for high-frequency ZVS/ZCS topologies	Choose for resonant LLC or active-clamp forward converters needing faster switching and lower gate drive loss

Compared with IRF740ASTRL, STP4NK40ZFP offers lower cost but sacrifices 6.5 A current capability and thermal performance; IXTP4N50D2 provides superior high-frequency efficiency yet lacks the 10 A continuous rating and 630 mJ avalanche margin critical for hard-switched flyback designs.

Availability

IRF740ASTRL is available at Aetrix Electronics and suitable for switch mode power supplies, uninterruptible power systems, and industrial motor drives requiring stable component supply across production lifecycles.

Supply support for IRF740ASTRL 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 and passive components, specializing in high-reliability power MOSFETs, diodes, and optoelectronics for industrial, automotive, and computing markets.

The IRF740AS family was developed for high-voltage, medium-current switching in offline power conversion, emphasizing avalanche ruggedness, low gate charge, and consistent parametric stability across temperature and manufacturing lots.

FAQ

What is the maximum continuous drain current for IRF740ASTRL at 100 °C case temperature?

The IRF740ASTRL supports 6.3 A continuous drain current at T_C = 100 °C, as specified in the Absolute Maximum Ratings table. This derating reflects thermal limitations of the D2PAK package and must be validated against actual PCB copper area and airflow. The full 10 A rating applies only at T_C = 25 °C with adequate heatsinking. IRF740ASTRL maintains R_DS(on) stability up to 150 °C junction temperature.

Does IRF740ASTRL have a fully rated avalanche capability, and how is it tested?

Yes, IRF740ASTRL is fully specified for repetitive and single-pulse avalanche operation: 10 A I_AR, 12.5 mJ E_AR, and 630 mJ E_AS. Testing follows JEDEC standards using unclamped inductive load (UIL) circuits with L = 12.6 mH, R_g = 25 Ω, and I_AS = 10 A per Figure 12. IRF740ASTRL's avalanche rating is validated across production lots and forms part of its qualification per Vishay's reliability program.

What is the gate threshold voltage range for IRF740ASTRL, and how does it affect drive requirements?

The gate threshold voltage (V_GS(th)) for IRF740ASTRL is 2.0–4.0 V at I_D = 250 μA, ensuring turn-on with standard 5 V or 10 V logic-level drivers. This range guarantees reliable enhancement above 4 V while preventing spurious conduction from noise. IRF740ASTRL achieves full R_DS(on) specification only at V_GS ≥ 10 V, making 12 V gate drive optimal for margin and dynamic performance.

Can IRF740ASTRL be used in place of IRF740APbF, and what are the key differences?

IRF740ASTRL and IRF740APbF share identical electrical specifications and D2PAK packaging, differing only in tape-and-reel packaging (STRL = tape-and-reel, PbF = bulk/tray). Both are RoHS-compliant Pb-free variants. IRF740ASTRL is functionally interchangeable with IRF740APbF in all circuit implementations; no schematic or layout changes are required. The "STRL" suffix denotes shipping format, not device revision or parameter shift.

What is the effective output capacitance (C_{oss eff.}) of IRF740ASTRL, and why is it important for SMPS design?

IRF740ASTRL has an effective output capacitance (C_{oss eff.}) of 61 pF, defined as the fixed capacitance yielding the same charging time as actual C_oss during V_DS rise from 0 to 80 % of 320 V. This value directly impacts turn-off loss and zero-voltage switching feasibility in flyback and forward converters. Lower C_{oss eff.} reduces stored energy (½·C·V²), improving efficiency and enabling higher switching frequencies without excessive loss.

IRF740ASTRL Specifications

Product attributes: Attribute value

Manufacturer:: Vishay Siliconix

Series:: -

Package/Case:: TO-263-3, D2PAK (2 Leads + Tab), TO-263AB

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

FET Type:: N-Channel

Technology:: MOSFET (Metal Oxide)

Drain to Source Voltage (Vdss):: 400 V

Current - Continuous Drain (Id) @ 25°C:: 10A (Tc)

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

Rds On (Max) @ Id, Vgs:: 550mOhm @ 6A, 10V

Vgs(th) (Max) @ Id:: 4V @ 250µA

Gate Charge (Qg) (Max) @ Vgs:: 36 nC @ 10 V

Vgs (Max):: ±30V

Input Capacitance (Ciss) (Max) @ Vds:: 1030 pF @ 25 V

FET Feature:: -

Power Dissipation (Max):: 3.1W (Ta), 125W (Tc)

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: TO-263 (D2PAK)

IRF740ASTRL FAQ

1.How can I place an order for IRF740ASTRL through Aetrix?

Please submit a Request for Quotation (RFQ) for IRF740ASTRL 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 IRF740ASTRL reliable?

The price and inventory of IRF740ASTRL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IRF740ASTRL is usually 5 days.

3.What payment methods are accepted for IRF740ASTRL?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IRF740ASTRL transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for IRF740ASTRL?

IRF740ASTRL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your IRF740ASTRL 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 IRF740ASTRL?

For technical support, including IRF740ASTRL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IRF740ASTRL requirements.

6.How does Aetrix verify that IRF740ASTRL is sourced from the original manufacturer or authorized distributors?

All IRF740ASTRL 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 IRF740ASTRL meets industry standards.

7.What is the process for return or replacement of IRF740ASTRL?

All IRF740ASTRL units undergo pre-shipment inspection (PSI). If there is an issue with IRF740ASTRL, 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 IRF740ASTRL part is unused and in its original packaging.

Return procedure for IRF740ASTRL:

1.Submit a request within 90 days.

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

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