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

STMicroelectronics STF5NK52ZD

Name: STF5NK52ZD
Brand: STMicroelectronics
SKU: STF5NK52ZD
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STF5NK52ZD

Manufacturer:: STMicroelectronics

Category:: FETs, MOSFETs

Package:: TO-220-3 Full Pack

Datasheet:: STF5NK52ZD.pdf

Description:: MOSFET N-CH 520V 4.4A TO220FP

Quantity:: RFQ Add To RFQ list

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Inventory:3,829

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Product details

Overview

STF5NK52ZD from STMicroelectronics is a Zener-protected N-channel SuperMESH Power MOSFET rated for 520 V drain-source voltage, 1.5 Ω max R_DS(on) at V_GS = 10 V and I_D = 2.2 A, 4.4 A continuous drain current at T_C = 25 °C, and 100% avalanche tested for ruggedness in high-voltage switching applications such as offline SMPS and AC motor controls.

For engineers reviewing the STF5NK52ZD datasheet, STF5NK52ZD pinout, STF5NK52ZD application, or STF5NK52ZD equivalent, key selection criteria include its 15 V/ns dv/dt capability, 170 mJ single-pulse avalanche energy, 16.9 nC total gate charge, Zener-protected gate, and TO-220 package thermal resistance of 1.78 °C/W junction-to-case.

Technical Context

This device implements ST's SuperMESH process - an evolution of PowerMESH - to simultaneously reduce on-resistance and enhance dynamic robustness. Its optimized cell layout yields low intrinsic capacitance (C_iss = 529 pF, C_oss = 71 pF) and minimized gate charge (Q_g = 16.9 nC), enabling fast, efficient hard-switching.

The integrated Zener diode across gate-source provides ESD protection up to 2.8 kV HBM, while the 100% unclamped inductive avalanche test ensures reliable operation under transient overvoltage conditions. Its 15 V/ns peak diode recovery dv/dt rating supports stable commutation in high-di/dt circuits with inductive loads.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	520 V - Supports primary-side switching in universal-input offline converters up to 380 V DC bus.
R_DS(on) max	1.5 Ω - Limits conduction loss to ≤29.0 W at 4.4 A, enabling thermally constrained TO-220 designs.
I_D cont. (T_C = 25 °C)	4.4 A - Sustains full-load current in 60–100 W SMPS without forced cooling.
E_AS	170 mJ - Absorbs energy from inductive kickback in relay drivers or flyback snubbers without failure.
dv/dt capability	15 V/ns - Prevents spurious turn-on during fast voltage transients in half-bridge or LLC resonant topologies.
Q_g	16.9 nC - Reduces gate drive power and enables use of low-current drivers (e.g., 100 mA peak).
R_thJC	1.78 °C/W - Enables 70 W dissipation with ≤125 °C junction rise above case at 25 °C ambient.

Pinout & Package

Supplied in TO-220 type A package (standard through-hole, insulated tab). Pin 1 = Gate (G), Pin 2 = Drain (D, connected to metal tab), Pin 3 = Source (S).

Pin/Terminal	Circuit Role	Design Meaning
G (Pin 1)	Control input	Receives 10 V logic-level gate drive; Zener-protected against ±30 V transients.
D (Pin 2 / Tab)	High-voltage power terminal	Electrically connected to metal tab; requires isolation from heatsink unless floating design.
S (Pin 3)	Power return path	Reference node for gate drive; carries full load current and reverse diode conduction.

Key Features

Feature	Design Value
Zener-protected gate	Integrated 20 V Zener clamps gate-source to ±30 V, eliminating need for external TVS in most industrial layouts.
100% avalanche tested	Each unit validated for repetitive/unrepetitive avalanche stress at I_AR = 4.4 A, ensuring field reliability in inductive switching.
Extremely high dv/dt capability	15 V/ns rating prevents false triggering in noisy high-side configurations with fast-rising V_DS.
Minimized gate charge	Q_g = 16.9 nC reduces driver losses and allows direct microcontroller GPIO driving with RC buffering.
Low output capacitance	C_oss = 71 pF lowers switching loss during zero-voltage transitions in resonant converters.

Applications

AC-DC Adapter Primary Switch

Flyback Converter Main Switch

Use Scenario: 65 W universal-input offline adapter operating in DCM/CCM with 380 V DC link.

IC Role / Device Role / Timing Role: High-voltage N-channel switch controlling energy transfer via primary winding.

Use Value: 520 V rating accommodates 380 V DC + 100 V margin; 1.5 Ω R_DS(on) limits conduction loss to <1.5 W at full load.

Use Scenario: Isolated 48 V/1 A telecom power supply using flyback topology.

IC Role / Device Role / Timing Role: Primary-side power switch synchronized with transformer reset cycle.

Use Value: 170 mJ E_AS safely absorbs leakage inductance energy; 15 V/ns dv/dt prevents false turn-on during reset spikes.

AC Motor Control Output Stage

Industrial Relay Driver

Use Scenario: 230 V AC single-phase motor control using phase-angle dimming or soft-start circuitry.

IC Role / Device Role / Timing Role: High-side switching element interrupting mains current at zero-crossing or controlled phase angle.

Use Value: 100% avalanche testing ensures survival during inductive back-EMF spikes up to 520 V.

Use Scenario: Solid-state replacement for electromechanical relays in PLC output modules.

IC Role / Device Role / Timing Role: Low-duty-cycle, high-voltage switch driving 24–230 V AC/DC inductive loads.

Use Value: Zener-protected gate withstands coil flyback transients; 4.4 A pulsed rating supports 10 A relay coils with 2.5× surge margin.

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
STP5NK52ZD	Same die, TO-220 package with insulated tab; identical R_DS(on), Q_g, and avalanche rating.	No functional difference; differs only in marking and packaging (tube vs. tape/reel).	Select when standard TO-220 mounting and tube delivery are preferred.
STD5NK52ZD	Same electrical specs but in DPAK (TO-252) surface-mount package; R_thJA = 60 °C/W vs. 62.5 °C/W.	Requires PCB copper area for thermal management; unsuitable for high-power through-hole assemblies.	Choose for space-constrained, automated SMT production where thermal budget permits.

Compared with STP5NK52ZD, the identical die ensures drop-in compatibility in existing TO-220 layouts; versus STD5NK52ZD, the through-hole STF5NK52ZD offers superior mechanical stability and higher power handling in non-SMT environments without thermal pad constraints.

Availability

STF5NK52ZD is available at Aetrix Electronics and suitable for AC-DC adapters, flyback converters, industrial relay drivers, and AC motor control circuits requiring stable component supply and long-term industrial lifecycle support.

Supply support for STF5NK52ZD 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, digital, and mixed-signal ICs for automotive, industrial, and power applications.

The SuperMESH Power MOSFET product line targets high-efficiency, high-reliability switching in offline power supplies and motor drives, emphasizing ruggedness, low gate charge, and avalanche survivability over cost-optimized alternatives.

FAQ

Is STF5NK52ZD pin-compatible with STP5NK52ZD?

Yes - both share identical TO-220 pinout (G-D-S), same die, and identical absolute maximum ratings. The only differences are part marking (P5NK52ZD vs. F5NK52ZD) and packaging format (tube vs. bulk). No PCB or schematic changes are required for substitution.

What is the maximum safe operating temperature for continuous operation?

The STF5NK52ZD has a maximum junction temperature of 150 °C. With R_thJC = 1.78 °C/W and 70 W P_TOT, sustained operation requires case temperature ≤25 °C. In practice, derating to 2.7 A at T_C = 100 °C ensures long-term reliability under thermal stress.

Does the Zener protection cover both positive and negative gate transients?

Yes - the integrated bidirectional Zener clamps gate-to-source voltage to ±20 V typical, with absolute maximum rating of ±30 V per datasheet Table 1. This protects against both positive ESD events and negative flyback spikes from inductive gate drivers or Miller coupling.

Can STF5NK52ZD be used in synchronous rectification?

No - it is an N-channel enhancement-mode MOSFET optimized for high-side switching, not low-side synchronous rectification. Its body diode forward voltage (1.6 V) and reverse recovery characteristics (Q_rr = 300–500 nC) are not optimized for high-frequency freewheeling; dedicated SR controllers or logic-level Schottky diodes are preferred.

STF5NK52ZD Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: SuperMESH™

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):: 520 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

STF5NK52ZD FAQ

1.How can I place an order for STF5NK52ZD through Aetrix?

Please submit a Request for Quotation (RFQ) for STF5NK52ZD 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 STF5NK52ZD reliable?

The price and inventory of STF5NK52ZD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STF5NK52ZD is usually 5 days.

3.What payment methods are accepted for STF5NK52ZD?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STF5NK52ZD transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STF5NK52ZD?

STF5NK52ZD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STF5NK52ZD 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 STF5NK52ZD?

For technical support, including STF5NK52ZD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STF5NK52ZD requirements.

6.How does Aetrix verify that STF5NK52ZD is sourced from the original manufacturer or authorized distributors?

All STF5NK52ZD 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 STF5NK52ZD meets industry standards.

7.What is the process for return or replacement of STF5NK52ZD?

All STF5NK52ZD units undergo pre-shipment inspection (PSI). If there is an issue with STF5NK52ZD, 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 STF5NK52ZD part is unused and in its original packaging.

Return procedure for STF5NK52ZD:

1.Submit a request within 90 days.

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

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