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

STMicroelectronics STF7N52DK3

Name: STF7N52DK3
Brand: STMicroelectronics
SKU: STF7N52DK3
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STF7N52DK3

Manufacturer:: STMicroelectronics

Category:: FETs, MOSFETs

Package:: TO-220-3 Full Pack

Datasheet:: STF7N52DK3.pdf

Description:: MOSFET N-CH 525V 6A TO220FP

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Product details

Overview

STF7N52DK3 from STMicroelectronics is an N-channel SuperFREDmesh3™ power MOSFET in TO-220FP package, rated for 525 V V_DS, 6 A continuous drain current at T_C = 25 °C, and 25 W total power dissipation. It integrates a Zener-protected gate, 1.15 Ω max R_DS(on) at V_GS = 10 V, and features extremely high dv/dt capability (20 V/ns) for robust switching in offline SMPS and PFC stages.

For engineers reviewing the STF7N52DK3 datasheet, STF7N52DK3 pinout, STF7N52DK3 application, or STF7N52DK3 equivalent, this device is selected for high-voltage flyback converters, resonant LLC primary switches, and industrial AC-DC front-end stages where avalanche ruggedness, fast body-diode recovery (t_rr = 110 ns), and gate charge minimization (Q_g = 33 nC) are critical.

Technical Context

This MOSFET employs ST's SuperFREDmesh3™ process to co-optimize conduction loss, switching speed, and diode recovery behavior. Its built-in back-to-back Zener diodes clamp gate-source voltage to ±30 V, eliminating external protection components while maintaining ESD integrity.

The device delivers 110 mJ single-pulse avalanche energy (E_AS) at T_J = 25 °C with I_AR = 3 A, and exhibits low C_oss(er) = 74 pF and C_iss = 870 pF - enabling high-frequency operation up to 300 kHz in hard-switched topologies without excessive switching loss.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	525 V - supports 380 VAC input rectified systems with ≥20% margin against line surges.
R_DS(on) max	1.15 Ω at V_GS = 10 V - enables <1.5 W conduction loss at 3.5 A RMS in 65 kHz flyback designs.
Q_g	33 nC - reduces gate drive power requirement and allows use of low-cost 1A peak drivers.
t_rr	110 ns at T_J = 25 °C - limits diode reverse recovery loss and EMI generation in discontinuous conduction mode (DCM) PFC.
R_thj-case	5 °C/W - permits 25 W dissipation with ≤125 °C junction rise over 25 °C case temperature using standard heatsink.
E_AS	110 mJ - withstands unclamped inductive switching events in relay driver or motor control fault conditions.
dv/dt	20 V/ns - suppresses false turn-on during high-slew-rate transients in half-bridge configurations.

Pinout & Package

TO-220FP package: 3-pin through-hole variant with isolated tab (pin 2), featuring internal thermal isolation between drain (tab) and leads. Pin 1 = Gate, Pin 2 = Drain (tab), Pin 3 = Source.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1	Gate	Control terminal; accepts 10 V logic-level drive; protected by integrated 30 V Zener diode.
Pin 2 (Tab)	Drain	Main high-side power terminal; electrically isolated from mounting surface per 2.5 kV RMS insulation rating.
Pin 3	Source	Return path for load current; referenced to gate drive ground; forms common node with body diode cathode.

Key Features

Feature	Design Value
100% avalanche tested	Every unit validated for single-pulse E_AS ≥ 110 mJ - ensures field reliability in unclamped inductive loads.
Zener-protected gate	Integrated ±30 V bidirectional clamping eliminates need for external gate Zener or TVS - reduces BOM count and PCB area.
Extremely high dv/dt capability	20 V/ns rating prevents spurious turn-on during fast voltage transients - critical for bridge-leg operation.
Improved diode reverse recovery	t_rr = 110 ns and Q_rr = 0.44 µC minimize switching loss and ringing in DCM boost converters.
Very low intrinsic capacitance	C_iss = 870 pF and C_oss(er) = 74 pF reduce capacitive switching losses and improve efficiency above 100 kHz.

Applications

AC-DC Adapter Primary Switch

Industrial PFC Boost Stage

Use Scenario: 65 W universal-input offline flyback converter operating at 65 kHz with quasi-resonant control.

IC Role / Device Role / Timing Role: High-side main switch handling full rectified AC line voltage (up to 560 V peak) and delivering regulated 12 V/5 A output.

Use Value: 525 V V_DS rating provides 25 V margin over worst-case surge; 1.15 Ω R_DS(on) keeps conduction loss under 1.2 W at full load.

Use Scenario: Active boost PFC stage in 3 kW industrial UPS front-end, operating in continuous conduction mode at 70 kHz.

IC Role / Device Role / Timing Role: Fast-recovery boost switch synchronizing with AC line zero-crossing to shape input current waveform.

Use Value: 110 ns t_rr and low Q_rr reduce diode recovery loss by >40% vs legacy Superjunction MOSFETs, improving PF correction accuracy.

LED Driver Flyback Controller

Motor Control Protection Switch

Use Scenario: Isolated constant-current LED driver for street lighting, accepting 230 VAC input and driving 48 V/700 mA string.

IC Role / Device Role / Timing Role: Primary-side power switch implementing primary-side regulation (PSR) with demagnetization sensing.

Use Value: Gate Zener protection ensures immunity to gate voltage overshoot during transformer leakage spike events - no external clamping required.

Use Scenario: DC bus protection switch in 24 V BLDC motor controller, interrupting fault current within 10 µs during short-circuit detection.

IC Role / Device Role / Timing Role: High-speed current-limiting switch placed between battery and inverter bridge, triggered by overcurrent comparator.

Use Value: 20 V/ns dv/dt immunity prevents false triggering during inverter shoot-through transients; 3 A repetitive avalanche current sustains fault clearing.

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-voltage power switching applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
STD7N52DK3	DPAK package, R_thj-case = 1.39 °C/W, PTOT = 90 W, same V_DS/R_DS(on)/Q_g.	Surface-mount layout; requires thermal pad on PCB; unsuitable for through-hole assembly or high-power heatsinking.	Select when board space is constrained and thermal management uses copper pour rather than external heatsink.
STP7N52DK3	TO-220 (non-FP) package, R_thj-case = 1.25 °C/W, PTOT = 100 W, identical electrical specs.	Non-isolated tab; requires insulating washer for heatsink mounting; higher thermal performance but lower isolation safety.	Select when maximum power dissipation (>25 W) is needed and galvanic isolation from heatsink is not required.

Compared with STD7N52DK3 and STP7N52DK3, STF7N52DK3 uniquely balances isolation safety (2.5 kV RMS), moderate power handling (25 W), and through-hole manufacturability - making it optimal for cost-sensitive, safety-certified AC-DC power supplies requiring UL/EN62368 compliance.

Availability

STF7N52DK3 is available at Aetrix Electronics and suitable for AC-DC adapters, industrial PFC modules, and LED driver designs requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for STF7N52DK3 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power devices, sensors, and analog ICs for industrial, automotive, and consumer markets.

This device belongs to ST's SuperFREDmesh3™ power MOSFET product line, engineered specifically for high-efficiency, high-reliability offline switching applications where avalanche ruggedness, fast diode recovery, and gate protection are mandatory.

FAQ

What is the maximum continuous drain current for STF7N52DK3 at 100 °C case temperature?

The maximum continuous drain current is 4 A at T_C = 100 °C, as specified in Table 1 of DS6515 Rev 3. This limit is imposed by junction temperature constraints, not package current-carrying capacity, and assumes proper heatsinking to maintain case temperature at or below 100 °C.

Does STF7N52DK3 require an external gate resistor for safe operation?

A gate resistor is required to control switching speed and damp ringing, but its value depends on application requirements. The datasheet recommends R_G = 4.7 Ω for switching time characterization (Table 5); typical design values range from 10 Ω to 47 Ω to balance EMI, loss, and dv/dt immunity in real-world layouts.

Can STF7N52DK3 be used in synchronous rectification applications?

No - STF7N52DK3 is an N-channel high-side switch optimized for primary-side switching, not synchronous rectification. Its body diode forward voltage (V_SD = 1.5 V) and reverse recovery characteristics are not optimized for low-loss secondary-side conduction; dedicated SR controllers and logic-level MOSFETs are recommended instead.

Is the TO-220FP package lead-free and RoHS compliant?

Yes - STF7N52DK3 is manufactured in ECOPACK®2-compliant TO-220FP packages, meeting RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006. Lead finish is matte tin, and halogen-free molding compound is used per ST's environmental specifications.

STF7N52DK3 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: SuperFREDmesh3™

Package/Case:: TO-220-3 Full Pack

Packaging:: Tube

Product Status:: Obsolete

FET Type:: N-Channel

Technology:: MOSFET (Metal Oxide)

Drain to Source Voltage (Vdss):: 525 V

Current - Continuous Drain (Id) @ 25°C:: 6A (Tc)

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

Rds On (Max) @ Id, Vgs:: 1.15Ohm @ 3A, 10V

Vgs(th) (Max) @ Id:: 4.5V @ 50µA

Gate Charge (Qg) (Max) @ Vgs:: 33 nC @ 10 V

Vgs (Max):: ±30V

Input Capacitance (Ciss) (Max) @ Vds:: 870 pF @ 50 V

FET Feature:: -

Power Dissipation (Max):: 25W (Tc)

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220FP

STF7N52DK3 FAQ

1.How can I place an order for STF7N52DK3 through Aetrix?

Please submit a Request for Quotation (RFQ) for STF7N52DK3 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 STF7N52DK3 reliable?

The price and inventory of STF7N52DK3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STF7N52DK3 is usually 5 days.

3.What payment methods are accepted for STF7N52DK3?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STF7N52DK3 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STF7N52DK3?

STF7N52DK3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STF7N52DK3 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 STF7N52DK3?

For technical support, including STF7N52DK3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STF7N52DK3 requirements.

6.How does Aetrix verify that STF7N52DK3 is sourced from the original manufacturer or authorized distributors?

All STF7N52DK3 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 STF7N52DK3 meets industry standards.

7.What is the process for return or replacement of STF7N52DK3?

All STF7N52DK3 units undergo pre-shipment inspection (PSI). If there is an issue with STF7N52DK3, 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 STF7N52DK3 part is unused and in its original packaging.

Return procedure for STF7N52DK3:

1.Submit a request within 90 days.

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

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