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

STMicroelectronics STD5NK50ZT4

Name: STD5NK50ZT4
Brand: STMicroelectronics
SKU: STD5NK50ZT4
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STD5NK50ZT4

Manufacturer:: STMicroelectronics

Category:: FETs, MOSFETs

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

Datasheet:: STD5NK50ZT4.pdf

Description:: MOSFET N-CH 500V 4.4A DPAK

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Product details

Overview

STD5NK50ZT4 from STMicroelectronics is a Zener-protected N-channel 500 V SuperMESH™ Power MOSFET in DPAK (TO-252) package, with 1.22 Ω typical R_DS(on), 4.4 A continuous drain current at T_C = 25 °C, and 100% avalanche tested. It serves as a high-voltage switching device in offline SMPS, AC-DC adapters, and industrial power supplies where dv/dt robustness and integrated gate protection are critical.

For engineers reviewing the STD5NK50ZT4 datasheet, STD5NK50ZT4 pinout, STD5NK50ZT4 application, or STD5NK50ZT4 equivalent, key selection factors include its 500 V V_DS, low 20 nC total gate charge, built-in gate-source Zener diodes, 4.5 V/ns dv/dt capability, and DPAK thermal performance with R_thj-pcb = 50 °C/W on 1-inch² FR-4 board.

Technical Context

This MOSFET employs ST's SuperMESH™ process to minimize R_DS(on) while maintaining high breakdown voltage and enhanced dv/dt immunity. Its intrinsic capacitances-C_iss = 535 pF, C_oss = 75 pF, C_rss = 17 pF-support fast, low-loss switching in hard-switched topologies.

The integrated back-to-back gate-source Zener diodes provide ±30 V clamping, eliminating external ESD protection components. The device is fully characterized for unclamped inductive switching, delivering 130 mJ single-pulse avalanche energy at T_j = 25 °C with I_AR = 4.4 A.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	500 V - supports primary-side switching in universal-input (85–265 V_AC) offline converters without derating.
R_DS(on) typ.	1.22 Ω - enables <4.4 A continuous conduction with ≤2.7 W conduction loss at T_C = 25 °C.
Q_g	20 nC - reduces gate drive power and allows use of low-current drivers in high-frequency SMPS designs.
dv/dt rating	4.5 V/ns - ensures reliable operation under fast transient conditions in noisy industrial environments.
E_AS	130 mJ - provides margin against inductive energy spikes during MOSFET turn-off in flyback or forward converters.
R_thj-pcb	50 °C/W - enables direct PCB heatsinking on standard 2-oz copper, simplifying thermal design vs. TO-220 alternatives.
V_(BR)GSO	±30 V - internal Zener clamping protects gate oxide from overvoltage transients, reducing BOM count.

Pinout & Package

DPAK (TO-252) package with exposed drain tab (pin 2) for thermal and electrical connection; compact surface-mount footprint optimized for automated assembly and PCB heatsinking.

Pin/Terminal	Circuit Role	Design Meaning
1 (G)	Gate	Control terminal; accepts 10 V logic-level drive; protected by integrated ±30 V Zener.
2 (D, TAB)	Drain / Thermal Pad	Main high-voltage output node and primary thermal path to PCB copper area.
3 (S)	Source	Power return and reference node; connects to ground or low-side switch node.

Key Features

Feature	Design Value
100% avalanche tested	Guarantees ruggedness in unclamped inductive switching; validated up to 130 mJ per pulse.
SuperMESH™ technology	Reduces R_DS(on) by ~20% vs. prior PowerMESH™ generation while preserving 500 V rating.
Zener-protected gate	Eliminates need for external gate clamp diodes, saving board space and cost in adapter designs.
Low C_rss (17 pF)	Minimizes Miller effect, improving noise immunity and enabling stable operation at >100 kHz.
High dv/dt immunity (4.5 V/ns)	Prevents false turn-on in high-noise bridge configurations without snubbers.

Applications

AC-DC Adapters

Flyback SMPS

Use Scenario: 36 W universal-input wall adapter for consumer electronics.

IC Role / Device Role / Timing Role: Primary-side high-voltage switch in discontinuous conduction mode (DCM) flyback converter.

Use Value: 1.22 Ω R_DS(on) and 20 nC Q_g enable >85% efficiency at full load while meeting EN 55022 Class B EMI limits.

Use Scenario: Isolated 24 V/2 A industrial control power supply.

IC Role / Device Role / Timing Role: Main switching transistor in quasi-resonant flyback with valley switching.

Use Value: 4.5 V/ns dv/dt rating prevents spurious turn-on during transformer reset, improving reliability in harsh EMI environments.

LED Driver Power Stages

Industrial Motor Control

Use Scenario: Constant-current LED driver for street lighting (100–277 V_AC input).

IC Role / Device Role / Timing Role: High-side switch in buck-derived offline topology with active PFC front-end.

Use Value: Integrated Zener protection withstands gate transients from PFC stage coupling, avoiding external TVS diodes.

Use Scenario: Low-power BLDC motor inverter stage for HVAC actuators.

IC Role / Device Role / Timing Role: Upper-leg switch in half-bridge driving 24 V DC bus with PWM frequency up to 40 kHz.

Use Value: 500 V rating provides margin against inductive kickback; 130 mJ E_AS absorbs energy during short-circuit events.

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
STP5NK50Z	Same die, TO-220 package; R_thj-case = 1.78 °C/W vs. DPAK's 5 °C/W; no exposed drain tab.	Requires mechanical heatsink; unsuitable for space-constrained SMT-only designs.	Select when higher power dissipation (>25 W) and forced-air cooling are available.
FQP5N50CT	500 V, 1.5 Ω max R_DS(on), 4.5 A ID; no integrated Zener; C_iss = 600 pF; DPAK package.	Lacks gate protection; requires external clamping; slightly higher switching losses.	Select only if gate drive circuitry includes discrete Zener protection and layout allows added component.

Compared with STP5NK50Z, STD5NK50ZT4 trades lower thermal resistance for surface-mount compatibility and integrated protection; versus FQP5N50CT, it delivers guaranteed Zener clamping and tighter R_DS(on) tolerance without BOM additions.

Availability

STD5NK50ZT4 is available at Aetrix Electronics and suitable for AC-DC adapters, flyback SMPS, and industrial LED drivers requiring stable component supply across production lifecycles.

Supply support for STD5NK50ZT4 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.

STD5NK50ZT4 belongs to ST's SuperMESH™ Power MOSFET product line, engineered specifically for high-efficiency, high-reliability offline switching applications where avalanche ruggedness and gate protection are mandatory.

FAQ

What is the maximum continuous drain current for STD5NK50ZT4 at 100 °C case temperature?

The maximum continuous drain current is 2.7 A at T_C = 100 °C, as specified in Table 1 of DS2834 Rev 6. This reflects thermal derating due to junction-to-case thermal resistance (R_thj-case = 5 °C/W) and safe operating area limitations-not a device failure threshold but a sustained operational limit under defined cooling conditions.

Does STD5NK50ZT4 require an external gate resistor for stability?

A gate resistor is required for controlled turn-on/turn-off timing and EMI reduction, but not for basic stability. The datasheet specifies t_d(on) and t_f test conditions using R_G = 4.7 Ω. Values between 2.2 Ω and 10 Ω are typical; lower values increase switching speed but risk ringing, while higher values reduce dv/dt stress at the cost of increased switching loss.

Can STD5NK50ZT4 be used in synchronous rectification topologies?

No-STD5NK50ZT4 is a standard-threshold N-channel MOSFET with V_GS(th) = 3.0–4.5 V and is not optimized for synchronous rectification. It lacks the low V_GS(th), fast body diode recovery (t_rr = 310 ns), and low Q_gd/Q_gs ratio required for efficient SR control. Dedicated SR controllers paired with logic-level MOSFETs are recommended instead.

Is the DPAK package of STD5NK50ZT4 lead-free and RoHS compliant?

Yes-STD5NK50ZT4 is manufactured in ST's ECOPACK®-compliant DPAK package, meeting RoHS Directive 2011/65/EU and REACH SVHC requirements. The device carries the "ECOPACK2" designation per ST's environmental compliance documentation, with lead-free terminations and halogen-free molding compound.

STD5NK50ZT4 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: SuperMESH™

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

Packaging:: Tape & Reel (TR)

Product Status:: Active

FET Type:: N-Channel

Technology:: MOSFET (Metal Oxide)

Drain to Source Voltage (Vdss):: 500 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:: 28 nC @ 10 V

Vgs (Max):: ±30V

Input Capacitance (Ciss) (Max) @ Vds:: 535 pF @ 25 V

FET Feature:: -

Power Dissipation (Max):: 70W (Tc)

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: DPAK

STD5NK50ZT4 FAQ

1.How can I place an order for STD5NK50ZT4 through Aetrix?

Please submit a Request for Quotation (RFQ) for STD5NK50ZT4 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 STD5NK50ZT4 reliable?

The price and inventory of STD5NK50ZT4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STD5NK50ZT4 is usually 5 days.

3.What payment methods are accepted for STD5NK50ZT4?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STD5NK50ZT4 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STD5NK50ZT4?

STD5NK50ZT4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STD5NK50ZT4 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 STD5NK50ZT4?

For technical support, including STD5NK50ZT4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STD5NK50ZT4 requirements.

6.How does Aetrix verify that STD5NK50ZT4 is sourced from the original manufacturer or authorized distributors?

All STD5NK50ZT4 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 STD5NK50ZT4 meets industry standards.

7.What is the process for return or replacement of STD5NK50ZT4?

All STD5NK50ZT4 units undergo pre-shipment inspection (PSI). If there is an issue with STD5NK50ZT4, 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 STD5NK50ZT4 part is unused and in its original packaging.

Return procedure for STD5NK50ZT4:

1.Submit a request within 90 days.

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

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