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

STMicroelectronics STF5N52U

Name: STF5N52U
Brand: STMicroelectronics
SKU: STF5N52U
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STF5N52U

Manufacturer:: STMicroelectronics

Category:: FETs, MOSFETs

Package:: TO-220-3 Full Pack

Datasheet:: STF5N52U.pdf

Description:: MOSFET N-CH 525V 4.4A TO220FP

Quantity:: RFQ Add To RFQ list

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Inventory:3,560

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Product details

Overview

STF5N52U from STMicroelectronics is an N-channel 525 V, 1.25 Ω typ., 4.4 A UltraFASTmesh™ Power MOSFET in TO-220FP package, designed for high-voltage switching applications with fast body-diode recovery (trr = 55 ns), low gate charge (Qg = 16.9 nC), and enhanced dv/dt capability (20 V/ns). It integrates Zener gate protection and operates up to 150 °C junction temperature.

For engineers reviewing the STF5N52U datasheet, STF5N52U pinout, STF5N52U application, or STF5N52U equivalent, key selection criteria include its 525 V breakdown voltage, 25 W total dissipation at TC = 25 °C, low RDS(on) of 1.25 Ω (typ.), and ultrafast diode recovery critical for hard-switched SMPS and PFC stages.

Technical Context

This device uses ST's UltraFASTmesh™ process to achieve simultaneous optimization of conduction loss (RDS(on)), switching speed (Qg = 16.9 nC, trr = 55 ns), and ruggedness (dv/dt = 20 V/ns, EAS = 170 mJ). Its integrated Zener-protected gate eliminates external clamping components.

The TO-220FP package provides insulated mounting (VISO = 2500 V RMS) and thermal resistance of 5 °C/W junction-to-case, enabling direct heatsink attachment without isolation hardware in offline AC-DC converters and industrial motor drives.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	525 V - Withstands full mains rectified voltage in 380 VAC systems with margin.
R_DS(on) (typ.)	1.25 Ω - Enables <4.4 A continuous conduction with ≤2.5 W conduction loss at 25 °C.
Q_g	16.9 nC - Reduces gate drive power and enables efficient operation with standard 10 V logic-level drivers.
t_rr	55 ns - Minimizes switching losses and EMI in hard-switched flyback and forward converters.
dv/dt	20 V/ns - Ensures reliable operation under high-slew-rate transients in noisy industrial environments.
EAS	170 mJ - Supports unclamped inductive switching in relay drivers and solenoid controls without external snubbers.
P_TOT	25 W - Defines maximum steady-state power dissipation at case temperature of 25 °C in TO-220FP package.

Pinout & Package

The STF5N52U is housed in a TO-220FP (Full-Pak) package with insulated tab, enabling direct heatsink mounting without additional isolation hardware. The plastic body isolates all three leads from the metal tab, rated for 2500 V RMS insulation.

Pin/Terminal	Circuit Role	Design Meaning
D (Tab)	Drain	High-voltage output node; electrically connected to insulated metal tab for thermal conduction and electrical isolation.
G	Gate	Control input requiring ≤±30 V; protected by integrated back-to-back Zener diodes (V_BRGSO = 30 V).
S	Source	Power return path and reference for gate drive; forms cathode of integrated fast recovery body diode.

Key Features

Feature	Design Value
UltraFASTmesh™ technology	Simultaneously optimizes R_DS(on), Q_g, and t_rr - reduces both conduction and switching losses in high-frequency SMPS.
Zener gate protection	Integrated ±30 V gate-source Zener diodes eliminate need for external TVS, simplifying layout and improving reliability.
Enhanced body diode	trr = 55 ns and Q_rr = 95 nC enable zero-voltage switching (ZVS) assist in resonant topologies without external diode.
Insulated TO-220FP package	2500 V RMS isolation between leads and tab allows direct heatsink mounting - reduces thermal interface layers and system BOM count.

Applications

AC-DC Adapter Primary Switch

Industrial Relay Driver

Use Scenario: 65 W offline flyback converter operating at 65 kHz with universal AC input (85–265 VAC).

IC Role / Device Role / Timing Role: High-side main switch handling rectified DC bus up to 375 V, turning on/off under PWM control.

Use Value: Low R_DS(on) (1.25 Ω) minimizes conduction loss; fast t_rr (55 ns) prevents cross-conduction loss during dead-time, improving efficiency by ≥1.2% over standard MOSFETs.

Use Scenario: Solid-state replacement for electromechanical relays controlling 24 VDC/5 A solenoid loads in PLC I/O modules.

IC Role / Device Role / Timing Role: Low-side load switch with integrated freewheeling diode conducting reverse inductive kick during turn-off.

Use Value: EAS = 170 mJ absorbs energy from 5 A inductive load without external snubber; Zener gate protection withstands 2.8 kV HBM ESD events in factory environments.

LED Streetlight Driver

UPS Inverter Stage

Use Scenario: Two-switch forward topology driving 100 W LED string with active PFC front-end.

IC Role / Device Role / Timing Role: Main switching element in isolated DC-DC stage, switching at 100 kHz with 50% duty cycle.

Use Value: dv/dt = 20 V/ns ensures immunity to voltage spikes from transformer leakage inductance; low C_oss (71 pF) reduces capacitive turn-on loss.

Use Scenario: Half-bridge leg in 1 kVA online UPS inverter converting 380 VDC bus to 230 VAC output.

IC Role / Device Role / Timing Role: High-side switch in bridge configuration, commutating inductive motor load current with body diode conduction during dead time.

Use Value: Fast trr (55 ns) and low Q_rr (95 nC) reduce shoot-through risk and switching loss during commutation, improving thermal margin at 50/60 Hz fundamental frequency.

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
STP5N52FD	Same V_DS (525 V), lower R_DS(on) (1.1 Ω typ.), D²PAK package, no insulated tab.	Requires external isolation for heatsink mounting; better suited for PCB-mounted thermal solutions with thermal vias.	Select when board-level thermal management is preferred over chassis-mount heatsinking.
FQP5N52	520 V rating, higher R_DS(on) (1.6 Ω max), TO-220 (non-insulated), no Zener gate protection.	Lacks integrated gate protection and insulation; requires external TVS and insulating pad for safe operation.	Select only for cost-sensitive, non-isolated, low-reliability applications where gate robustness is not critical.

Compared with STP5N52FD and FQP5N52, the STF5N52U uniquely combines insulated TO-220FP packaging, Zener gate protection, and 55 ns trr - making it optimal for safety-critical, field-deployed AC-DC and industrial control systems requiring minimal external components and high ruggedness.

Availability

STF5N52U is available at Aetrix Electronics and suitable for AC-DC adapters, industrial relay drivers, and LED streetlight drivers requiring stable component supply across extended production lifecycles.

Supply support for STF5N52U 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.

The STF5N52U belongs to ST's UltraFASTmesh™ Power MOSFET product line, engineered specifically for high-efficiency, high-reliability switching in offline power supplies and industrial motor controls where fast recovery, gate ruggedness, and thermal robustness are essential.

FAQ

What is the maximum continuous drain current for STF5N52U at 100 °C case temperature?

The STF5N52U supports 2.8 A continuous drain current at TC = 100 °C, as specified in Table 2 of the official datasheet (DocID15684 Rev 3). This derating reflects thermal limits of the TO-220FP package and ensures safe operation within SOA boundaries under sustained load conditions.

Does STF5N52U require an external gate resistor for typical 65 kHz flyback applications?

Yes - a gate resistor of 4.7 Ω is recommended per Figure 16 in the datasheet for switching tests at VDD = 260 V and ID = 2.2 A. This value balances switching speed (to minimize losses) and EMI suppression, especially given the device's low Qg (16.9 nC) and fast dv/dt capability.

Can STF5N52U replace STD5N52U in the same PCB footprint?

No - STD5N52U uses DPAK (TO-252) while STF5N52U uses TO-220FP; their footprints and thermal mounting methods are incompatible. DPAK is surface-mount with exposed drain pad; TO-220FP is through-hole with insulated tab requiring mechanical screw mounting and heatsink interface.

Is the body diode in STF5N52U suitable for synchronous rectification?

No - the integrated body diode has trr = 55 ns and Qrr = 95 nC, which is too slow and lossy for synchronous rectification above ~50 kHz. It is optimized for freewheeling and clamping, not high-frequency bidirectional conduction; discrete Schottky or GaN FETs are required for SR implementation.

STF5N52U Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: UltraFASTmesh™

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:: 4.4A (Tc)

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

Rds On (Max) @ Id, Vgs:: 1.5Ohm @ 2.2A, 10V

Vgs(th) (Max) @ Id:: 4.5V @ 50µA

Gate Charge (Qg) (Max) @ Vgs:: 16.9 nC @ 10 V

Vgs (Max):: ±30V

Input Capacitance (Ciss) (Max) @ Vds:: 529 pF @ 25 V

FET Feature:: -

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

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220FP

STF5N52U FAQ

1.How can I place an order for STF5N52U through Aetrix?

Please submit a Request for Quotation (RFQ) for STF5N52U 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 STF5N52U reliable?

The price and inventory of STF5N52U are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STF5N52U is usually 5 days.

3.What payment methods are accepted for STF5N52U?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STF5N52U transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STF5N52U?

STF5N52U orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STF5N52U 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 STF5N52U?

For technical support, including STF5N52U datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STF5N52U requirements.

6.How does Aetrix verify that STF5N52U is sourced from the original manufacturer or authorized distributors?

All STF5N52U 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 STF5N52U meets industry standards.

7.What is the process for return or replacement of STF5N52U?

All STF5N52U units undergo pre-shipment inspection (PSI). If there is an issue with STF5N52U, 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 STF5N52U part is unused and in its original packaging.

Return procedure for STF5N52U:

1.Submit a request within 90 days.

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

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