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

STMicroelectronics STB5NK52ZD-1

Name: STB5NK52ZD-1
Brand: STMicroelectronics
SKU: STB5NK52ZD-1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STB5NK52ZD-1

Manufacturer:: STMicroelectronics

Category:: FETs, MOSFETs

Package:: TO-262-3 Long Leads, I2PAK, TO-262AA

Datasheet:: STB5NK52ZD-1.pdf

Description:: MOSFET N-CH 520V 4.4A I2PAK

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Inventory:9,057

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Product details

Overview

STB5NK52ZD-1 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), and 4.4 A continuous drain current at T_C = 25 °C. It delivers high dv/dt capability (15 V/ns), low gate charge (16.9 nC), and 100% avalanche tested ruggedness for hard-switching power conversion stages in offline SMPS and AC-DC adapters.

For engineers reviewing the STB5NK52ZD-1 datasheet, STB5NK52ZD-1 pinout, STB5NK52ZD-1 application, or STB5NK52ZD-1 equivalent, key selection criteria include its Zener-protected gate, 1.22 Ω typical on-resistance, TO-220 package thermal resistance (R_thJC = 1.78 °C/W), 170 mJ single-pulse avalanche energy, and ESD robustness (2.8 kV HBM).

Technical Context

This device implements ST's SuperMESH process-a refined iteration of PowerMESH-optimized to reduce R_DS(on) while preserving high-voltage integrity and fast switching dynamics. Its Zener-protected gate structure enables reliable operation under transient overvoltage conditions without external clamping.

The MOSFET exhibits low intrinsic capacitance (C_iss = 529 pF, C_oss = 71 pF) and minimized gate charge (Q_g = 16.9 nC), enabling efficient operation in high-frequency flyback and resonant converters up to several hundred kHz. Its 15 V/ns dv/dt rating ensures immunity to parasitic turn-on in high-noise industrial power supplies.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	520 V - supports universal-input (85–265 VAC) offline SMPS with margin for surge and ringing
R_DS(on) max	1.5 Ω - limits conduction loss to ≤3.0 W at 4.4 A, enabling thermally constrained TO-220 designs
I_D cont @ 25°C	4.4 A - defines maximum continuous output power handling in fixed-frequency hard-switched topologies
E_AS	170 mJ - sustains unclamped inductive switching events without failure, critical for PFC and flyback snubberless designs
dv/dt rating	15 V/ns - prevents false triggering during fast voltage transients in high-side switch configurations
Q_g	16.9 nC - reduces gate drive power and allows use of low-cost bipolar or small-signal MOSFET drivers
R_thJC	1.78 °C/W - enables 70 W dissipation with modest heatsinking, supporting compact adapter form factors

Pinout & Package

STB5NK52ZD-1 is housed in a TO-220 type A package with isolated tab (drain-connected). The case is electrically connected to the drain terminal, requiring insulating mounting hardware when used in non-isolated configurations.

Pin/Terminal	Circuit Role	Design Meaning
1 (G)	Gate	Control input; Zener-protected to ±30 V, requires <16.9 nC drive for full enhancement
2 (TAB)	Drain	Main high-voltage power path; electrically tied to metal tab-must be insulated from heatsink if floating
3 (S)	Source	Power return and reference node; connects to driver ground and current-sense resistor

Key Features

Feature	Design Value
Zener-protected gate	Integrated 30 V bidirectional clamp eliminates need for external gate protection diodes in noisy environments
100% avalanche tested	Each unit validated for single-pulse avalanche energy ≥170 mJ, ensuring field reliability in inductive switching
Extremely high dv/dt capability	15 V/ns rating prevents spurious turn-on during fast voltage transitions in high-side or half-bridge layouts
Low intrinsic capacitance	C_oss = 71 pF and C_rss = 13.4 pF minimize Miller effect and improve switching speed stability
SuperMESH technology	Optimized cell layout achieves 1.22 Ω typical R_DS(on) at 520 V, improving efficiency vs. legacy PowerMESH

Applications

AC-DC Adapters

Flyback Converters

Use Scenario: 36 W universal-input wall adapter with primary-side regulation.

IC Role / Device Role / Timing Role: Main power switch in discontinuous conduction mode (DCM) flyback topology.

Use Value: 1.5 Ω R_DS(on) and 170 mJ E_AS enable robust start-up and short-circuit recovery without snubber losses.

Use Scenario: Isolated auxiliary supply for industrial PLC I/O modules.

IC Role / Device Role / Timing Role: Primary-side switch operating at 65 kHz with valley-switching control.

Use Value: 15 V/ns dv/dt immunity prevents false triggering during transformer leakage spike recovery.

LED Drivers

Offline SMPS

Use Scenario: Constant-current LED driver for street lighting (230 VAC input, 48 V/700 mA output).

IC Role / Device Role / Timing Role: High-side switch in buck-boost PFC front-end stage.

Use Value: Zener-protected gate withstands line surges per IEC 61000-4-5, eliminating external TVS on gate.

Use Scenario: 65 W open-frame power supply for network equipment.

IC Role / Device Role / Timing Role: Main switch in quasi-resonant (QR) flyback with zero-voltage switching.

Use Value: Low C_oss (71 pF) and Q_g (16.9 nC) reduce switching loss and gate drive complexity.

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 without "-1" suffix; identical R_DS(on), V_DS, and avalanche rating	No functional difference; pinout and thermal performance identical	Select when standard TO-220 (non-isolated tab) mounting is acceptable and ECOPACK2 compliance not required
STD5NK52Z-1	TO-252 (DPAK) package; higher R_thJA (62.5 °C/W vs. 1.78 °C/W); same V_DS/I_D ratings	Lower power density; unsuitable for >15 W continuous conduction without forced air	Choose only for space-constrained PCB layouts where heatsinking is impractical and power <12 W

Compared with STP5NK52ZD and STD5NK52Z-1, STB5NK52ZD-1 offers identical electrical performance to STP5NK52ZD but with enhanced environmental compliance (ECOPACK2), while providing superior thermal management over STD5NK52Z-1 due to its TO-220 package's lower junction-to-case resistance.

Availability

STB5NK52ZD-1 is available at Aetrix Electronics and suitable for AC-DC adapters, flyback converters, and offline SMPS requiring stable component supply across extended production lifecycles.

Supply support for STB5NK52ZD-1 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.

STB5NK52ZD-1 belongs to ST's SuperMESH Power MOSFET product line, engineered specifically for high-efficiency, high-reliability offline power conversion where ruggedness, low conduction loss, and fast switching are critical.

FAQ

Is STB5NK52ZD-1 pin-compatible with STP5NK52ZD?

Yes, STB5NK52ZD-1 and STP5NK52ZD share identical pinout, package outline, and electrical specifications. Both use TO-220 type A with drain-connected tab, gate at pin 1, and source at pin 3. The "-1" suffix denotes updated ECOPACK2 environmental compliance, not a mechanical or functional change.

What is the maximum safe operating temperature for continuous operation?

The STB5NK52ZD-1 has a maximum junction temperature (T_J) of 150 °C. For continuous operation at full 4.4 A drain current, case temperature must remain ≤100 °C-achievable with a 10 °C/W heatsink and 1.78 °C/W R_thJC, assuming ambient ≤50 °C and adequate airflow.

Does STB5NK52ZD-1 require external gate protection?

No. The integrated Zener diode protects the gate against ±30 V transients, making external gate protection unnecessary in most applications. However, a small series resistor (10–47 Ω) is still recommended to dampen ringing and limit peak gate current during fast switching.

Can STB5NK52ZD-1 replace STF5NK52ZD in existing designs?

Yes, with verification of thermal and layout constraints. STF5NK52ZD uses TO-220FP (full-pack) with insulated tab, whereas STB5NK52ZD-1 uses standard TO-220 with conductive tab. Mechanical mounting and isolation requirements must be re-evaluated, though electrical performance is identical.

STB5NK52ZD-1 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: SuperMESH™

Package/Case:: TO-262-3 Long Leads, I2PAK, TO-262AA

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):: 70W (Tc)

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: I2PAK

STB5NK52ZD-1 FAQ

1.How can I place an order for STB5NK52ZD-1 through Aetrix?

Please submit a Request for Quotation (RFQ) for STB5NK52ZD-1 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 STB5NK52ZD-1 reliable?

The price and inventory of STB5NK52ZD-1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STB5NK52ZD-1 is usually 5 days.

3.What payment methods are accepted for STB5NK52ZD-1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STB5NK52ZD-1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STB5NK52ZD-1?

STB5NK52ZD-1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STB5NK52ZD-1 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 STB5NK52ZD-1?

For technical support, including STB5NK52ZD-1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STB5NK52ZD-1 requirements.

6.How does Aetrix verify that STB5NK52ZD-1 is sourced from the original manufacturer or authorized distributors?

All STB5NK52ZD-1 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 STB5NK52ZD-1 meets industry standards.

7.What is the process for return or replacement of STB5NK52ZD-1?

All STB5NK52ZD-1 units undergo pre-shipment inspection (PSI). If there is an issue with STB5NK52ZD-1, 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 STB5NK52ZD-1 part is unused and in its original packaging.

Return procedure for STB5NK52ZD-1:

1.Submit a request within 90 days.

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

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