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

STMicroelectronics STD7N52DK3

Name: STD7N52DK3
Brand: STMicroelectronics
SKU: STD7N52DK3
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STD7N52DK3

Manufacturer:: STMicroelectronics

Category:: FETs, MOSFETs

Package:: TO-252-3, DPAK (2 Leads + Tab), SC-63

Datasheet:: STD7N52DK3.pdf

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

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Product details

Overview

STD7N52DK3 from STMicroelectronics is an N-channel 525 V, 1.15 Ω (max), 6 A SuperFREDmesh3™ power MOSFET in DPAK (TO-252) package, featuring Zener gate protection, 100% avalanche tested operation, and optimized for high-voltage switching in offline SMPS and PFC stages.

For engineers reviewing the STD7N52DK3 datasheet, STD7N52DK3 pinout, STD7N52DK3 application, or STD7N52DK3 equivalent, key selection criteria include its 20 V/ns dv/dt capability, 110 ns diode reverse recovery time at 150 °C, 33 nC total gate charge, and R_thj-case of 1.39 °C/W - critical for thermal design in compact, high-efficiency converters.

Technical Context

This device implements ST's SuperFREDmesh3™ process, integrating a fast-recovery body diode with low Q_rr (0.44 µC typ. at 25 °C) and improved softness (trr = 140 ns max at 150 °C). Its gate threshold voltage (3.0–4.5 V) ensures robust noise immunity while enabling direct drive from standard 10 V gate drivers.

The built-in back-to-back Zener diodes clamp V_GS to ±30 V, eliminating external gate protection components. Its 1.15 Ω R_DS(on) at V_GS = 10 V and 3 A, combined with 90 W P_TOT, supports continuous conduction mode operation in 65–100 kHz flyback and boost topologies.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	525 V - supports 380 V AC input rectified systems with ≥20% margin against surge transients
R_DS(on) max	1.15 Ω at V_GS = 10 V, I_D = 3 A - enables <1.0 W conduction loss at 6 A RMS in PFC boost switches
Q_g	33 nC - reduces gate driver power demand and switching losses in high-frequency operation
trr	110 ns (25 °C), 140 ns (150 °C) - minimizes diode recovery loss and EMI in hard-switched topologies
E_AS	110 mJ - provides unclamped inductive switching robustness without external snubbers
dv/dt	20 V/ns - ensures reliable operation under fast-rising drain transients in high-noise environments
R_thj-case	1.39 °C/W - allows >70 W dissipation with standard heatsink mounting on PCB copper area

Pinout & Package

STD7N52DK3 uses the DPAK (TO-252) package with exposed drain tab for thermal and electrical connection. The 3-pin configuration places Drain (D) on the large metal tab (pin 2 and tab), Gate (G) on pin 1, and Source (S) on pin 3.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1 (G)	Gate	Control terminal; accepts 10 V logic-level drive; protected by integrated 30 V Zener
Pin 2 + Tab (D)	Drain	Main high-side switching node; electrically and thermally connected to PCB copper pour
Pin 3 (S)	Source	Power return path; referenced to control ground; forms source node for current sensing

Key Features

Feature	Design Value
Zener gate protection	Integrated ±30 V bidirectional clamping eliminates need for external TVS diodes on gate
SuperFREDmesh3™ diode	Soft reverse recovery (Q_rr = 0.44 µC) reduces EMI and stress on primary-side capacitors
100% avalanche rated	Guaranteed 110 mJ single-pulse energy withstand enables reliable unclamped inductive switching
Low C_oss(er)	74 pF energy-related output capacitance minimizes turn-off loss in high-voltage switching
High dv/dt immunity	20 V/ns rating prevents false turn-on during fast drain transients in bridge configurations

Applications

AC-DC Power Adapters

Industrial SMPS

Use Scenario: 65 W universal-input flyback converter for medical-grade wall adapters.

IC Role / Device Role / Timing Role: Primary-side high-voltage switch operating at 65 kHz with quasi-resonant control.

Use Value: Low R_DS(on) and fast trr reduce conduction and recovery losses, enabling >90% efficiency at full load.

Use Scenario: 300 W active PFC front-end in programmable logic controller (PLC) power supply.

IC Role / Device Role / Timing Role: Boost switch in continuous conduction mode (CCM) PFC stage, switching at 100 kHz.

Use Value: Avalanche ruggedness and 525 V rating ensure reliability during line surges and brownouts.

LED Street Lighting Drivers

UPS DC-DC Stages

Use Scenario: Isolated buck-boost LED driver for outdoor 150 W street lamps.

IC Role / Device Role / Timing Role: High-side switch in secondary-side synchronous rectification and dimming control circuit.

Use Value: Zener-protected gate withstands repeated hot-plug events and ESD during field maintenance.

Use Scenario: Bidirectional DC-DC converter in online UPS battery charging/discharging module.

IC Role / Device Role / Timing Role: Main switching element in half-bridge topology handling 400 V DC bus inversion.

Use Value: 20 V/ns dv/dt capability prevents spurious turn-on during rapid bus polarity reversal.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STF7N52DK3	Same die, TO-220FP package; R_thj-case = 5 °C/W vs. 1.39 °C/W; P_TOT = 25 W	Suitable for lower-power, through-hole designs with heatsink mounting; not surface-mount compatible	Select when board space permits through-hole assembly and thermal management uses discrete heatsinks
IPP65R190CFD7	650 V, 190 mΩ, CoolMOS™ CFD7; lower R_DS(on) but no integrated Zener; Q_g = 42 nC	Better efficiency at light loads; requires external gate protection; higher cost	Prefer for ultra-high-efficiency server PSUs where gate drive complexity and cost are acceptable trade-offs

Compared with STF7N52DK3, STD7N52DK3 offers 3.6× lower thermal resistance and surface-mount compatibility; versus IPP65R190CFD7, it trades higher R_DS(on) for integrated gate protection and lower gate charge, simplifying layout in cost-sensitive industrial converters.

Availability

STD7N52DK3 is available at Aetrix Electronics and suitable for AC-DC power adapters, industrial SMPS, LED street lighting drivers, and UPS DC-DC stages requiring stable component supply and long-term manufacturing continuity.

Supply support for STD7N52DK3 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 analog, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.

STD7N52DK3 belongs to ST's SuperFREDmesh3™ power MOSFET product line, engineered specifically for high-reliability, high-voltage switching in offline power conversion where avalanche ruggedness, diode softness, and gate protection are critical.

FAQ

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

The maximum continuous drain current (I_D) for STD7N52DK3 at T_C = 100 °C is 4 A, as specified in Table 1 of DS6515 Rev 3. This limit is set by junction temperature constraints and reflects derating from the 6 A rating at 25 °C case temperature.

Does STD7N52DK3 require external gate protection?

No - STD7N52DK3 integrates back-to-back Zener diodes between gate and source with a breakdown voltage of 30 V (±1 V tolerance), providing inherent overvoltage protection and eliminating the need for external gate clamp components in standard 10 V gate drive applications.

How does the SuperFREDmesh3™ body diode improve system performance?

The SuperFREDmesh3™ diode delivers soft reverse recovery with Q_rr = 0.44 µC (typ.) and trr = 110 ns (25 °C), reducing voltage overshoot and EMI generation during turn-off. This enables smaller snubber networks and improves reliability in hard-switched topologies like boost PFC.

Can STD7N52DK3 be used in avalanche mode for energy recovery?

Yes - STD7N52DK3 is 100% avalanche tested with guaranteed E_AS = 110 mJ (single pulse, T_J = 25 °C). It supports controlled unclamped inductive switching in applications such as relay driving or snubberless flyback designs, provided peak current and voltage remain within SOA limits.

STD7N52DK3 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: SuperFREDmesh3™

Package/Case:: TO-252-3, DPAK (2 Leads + Tab), SC-63

Packaging:: Tape & Reel (TR)

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):: 90W (Tc)

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: DPAK

STD7N52DK3 FAQ

1.How can I place an order for STD7N52DK3 through Aetrix?

Please submit a Request for Quotation (RFQ) for STD7N52DK3 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 STD7N52DK3 reliable?

The price and inventory of STD7N52DK3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STD7N52DK3 is usually 5 days.

3.What payment methods are accepted for STD7N52DK3?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STD7N52DK3 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STD7N52DK3?

STD7N52DK3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STD7N52DK3 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 STD7N52DK3?

For technical support, including STD7N52DK3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STD7N52DK3 requirements.

6.How does Aetrix verify that STD7N52DK3 is sourced from the original manufacturer or authorized distributors?

All STD7N52DK3 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 STD7N52DK3 meets industry standards.

7.What is the process for return or replacement of STD7N52DK3?

All STD7N52DK3 units undergo pre-shipment inspection (PSI). If there is an issue with STD7N52DK3, 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 STD7N52DK3 part is unused and in its original packaging.

Return procedure for STD7N52DK3:

1.Submit a request within 90 days.

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

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