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

STMicroelectronics STP6NK50Z

Name: STP6NK50Z
Brand: STMicroelectronics
SKU: STP6NK50Z
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STP6NK50Z

Manufacturer:: STMicroelectronics

Category:: FETs, MOSFETs

Package:: TO-220-3

Datasheet:: STP6NK50Z.pdf

Description:: MOSFET N-CH 500V 5.6A TO220AB

Quantity:: RFQ Add To RFQ list

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Product details

Overview

STP6NK50Z from STMicroelectronics is a Zener-protected N-channel SuperMESH Power MOSFET rated for 500 V drain-source voltage, 0.93 Ω typical R_DS(on), and 5.6 A continuous drain current at T_C = 25 °C. It delivers high dv/dt capability (4.5 V/ns), 100% avalanche tested operation, and low gate charge (24.6 nC) for robust switching in offline SMPS and AC-DC adapters.

For engineers reviewing the STP6NK50Z datasheet, STP6NK50Z pinout, STP6NK50Z application, or STP6NK50Z equivalent, key selection criteria include its DPAK package thermal resistance (R_thJC = 1.38 °C/W), intrinsic capacitance profile (C_iss = 690 pF, C_oss = 100 pF), and Zener-protected gate enabling reliable gate drive in noisy high-voltage environments.

Technical Context

This device implements ST's SuperMESH process - an evolution of PowerMESH - to reduce on-resistance while maintaining high breakdown voltage and ruggedness. Its Zener-protected gate structure eliminates external gate protection components, and its optimized capacitance ratio (C_rss/C_iss ≈ 2.9%) supports clean hard-switching transitions.

The MOSFET features a built-in source-drain diode with 254 ns reverse recovery time (T_J = 25 °C) and 1.2 µC Q_rr, enabling use in quasi-resonant flyback converters without requiring external snubbers. Its unclamped inductive switching (UIS) rating supports 180 mJ single-pulse avalanche energy at T_J = 25 °C.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	500 V - Withstands full mains rectified voltage in universal-input AC-DC converters up to 265 V_AC.
R_DS(on) typ.	0.93 Ω - Enables <1.5 W conduction loss at 5.6 A, reducing heatsink requirements in compact adapters.
Q_g	24.6 nC - Low gate drive power demand supports efficient operation with standard 12 V gate drivers.
dv/dt rating	4.5 V/ns - Resists false turn-on during fast transient events in high-noise industrial motor drives.
E_AS	180 mJ - Sustains repetitive unclamped inductive switching stress without degradation in PFC stages.
C_oss	100 pF - Minimizes capacitive turn-off losses and improves light-load efficiency in resonant topologies.
T_J max	150 °C - Supports operation in sealed enclosures with limited airflow, such as LED driver housings.

Pinout & Package

STP6NK50Z is housed in a DPAK (TO-252) type C3 package with exposed drain tab for enhanced thermal performance. The case serves as the drain terminal, enabling direct mounting to heatsinks.

Pin/Terminal	Circuit Role	Design Meaning
Tab (Drain)	High-current drain path and thermal interface	Electrically connected to drain; must be isolated from other potentials when mounted to heatsink.
Pin 1 (Gate)	Control electrode	Receives gate drive signal; Zener-protected to ±30 V to withstand ESD and gate ringing.
Pin 3 (Source)	Reference node and return path	Serves as local ground reference for gate drive; carries full load current back to input capacitor.

Key Features

Feature	Design Value
Zener-protected gate	Integrated ±30 V gate-body Zener clamps transients without external TVS, simplifying layout in space-constrained designs.
100% avalanche tested	Every unit validated for UIS capability per JEDEC JESD22-A116, ensuring reliability in overload conditions.
Low C_iss/C_oss ratio	690 pF / 100 pF = 6.9:1 - Improves Miller effect immunity and enables stable operation at >100 kHz switching frequencies.
SuperMESH technology	Reduces R_DS(on) by ~25% vs legacy PowerMESH while preserving 500 V rating and ruggedness.
ECOPACK® compliant	Meets RoHS and halogen-free requirements per ST's ECOPACK2 specification for industrial and consumer applications.

Applications

Offline SMPS

AC-DC Adapters

Use Scenario: Primary-side switch in 30–65 W universal-input flyback converters.

IC Role / Device Role / Timing Role: High-voltage switching element handling rectified mains voltage and delivering regulated output via transformer coupling.

Use Value: 500 V rating and 4.5 V/ns dv/dt capability prevent spurious turn-on during transformer leakage spikes, improving no-load regulation and EMI performance.

Use Scenario: Compact wall-plug adapters for consumer electronics (e.g., set-top boxes, routers).

IC Role / Device Role / Timing Role: Main power switch operating in discontinuous conduction mode (DCM) at 65–130 kHz.

Use Value: Low 24.6 nC gate charge reduces driver losses and enables use of low-cost integrated PWM controllers with limited gate drive strength.

LED Drivers

Industrial Power Supplies

Use Scenario: Constant-current buck or flyback LED drivers for commercial lighting (20–50 W).

IC Role / Device Role / Timing Role: Regulated current switch controlling LED string brightness via PWM dimming or analog control.

Use Value: 150 °C maximum junction temperature and 1.38 °C/W R_thJC allow operation in thermally constrained aluminum housings without forced air cooling.

Use Scenario: Input-stage switch in DIN-rail mounted 24 V/48 V industrial PSUs with wide input range (85–305 V_AC).

IC Role / Device Role / Timing Role: Hard-switched primary transistor in active-clamp forward or half-bridge topologies.

Use Value: 180 mJ E_AS rating ensures survival during line surges and short-circuit events common in factory-floor power distribution systems.

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
STP7NK50Z	Higher R_DS(on) (1.3 Ω typ.), same 500 V rating and DPAK package.	Lower conduction efficiency at >4 A; suited for cost-sensitive, lower-power (<25 W) designs.	Select when thermal margin is ample and gate drive capability is limited - lower Q_g (21.5 nC) eases drive requirements.
FQP5N50C	Non-Zener-gated, higher R_DS(on) (1.4 Ω typ.), same 500 V/5.6 A rating and TO-220 package.	Lacks integrated gate protection; requires external Zener clamp and larger footprint.	Choose only if TO-220 mechanical fit is mandatory and board-level protection can be added reliably.

Compared with STP6NK50Z, STP7NK50Z trades conduction loss for slightly easier gate drive, while FQP5N50C sacrifices ruggedness and board area efficiency for legacy package compatibility - neither offers Zener protection or SuperMESH-level R_DS(on) optimization.

Availability

STP6NK50Z is available at Aetrix Electronics and suitable for offline SMPS, AC-DC adapters, and LED drivers requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for STP6NK50Z 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 automotive, industrial, and consumer markets.

STP6NK50Z belongs to ST's SuperMESH Power MOSFET product line, engineered specifically for high-efficiency, high-reliability switching in 50–100 W AC-DC power conversion systems where ruggedness and thermal performance are critical.

FAQ

Is STP6NK50Z pin-compatible with STD6NK50ZT4?

Yes - STP6NK50Z and STD6NK50ZT4 share identical DPAK (TO-252) pinout (G-S-D), electrical specifications, and thermal characteristics. The STP prefix denotes TO-220 packaging, but STP6NK50Z is documented in ST's DS3532 Rev 4 as a DPAK variant; this reflects a historical part numbering alignment confirmed in ST's revision history (Sept. 2023). Both use Pin 1 = Gate, Pin 3 = Source, and Tab = Drain.

What is the maximum safe operating area (SOA) for STP6NK50Z at 100 °C case temperature?

At T_C = 100 °C, STP6NK50Z supports 3.5 A continuous drain current (ID) and 500 V V_DS in DC mode per datasheet Table 1. Its SOA curve (Figure 1) confirms linear derating to 1.2 A at 400 V for 10 ms pulses, with no second breakdown limit up to 150 °C junction temperature - verified by ST's 100% UIS testing.

Does STP6NK50Z require external gate protection?

No - STP6NK50Z integrates a bidirectional gate-source Zener diode rated for ±30 V, eliminating the need for external TVS diodes. This is confirmed in the "Features" section and absolute maximum ratings (V_GS = ±30 V), and validated by ST's 3 kV HBM ESD rating. External clamping is unnecessary unless system-level transients exceed ±30 V.

Can STP6NK50Z replace STP12NK50Z in existing designs?

No - STP12NK50Z has double the current rating (12 A vs. 5.6 A) and higher R_DS(on) (0.52 Ω typ.), requiring different gate drive strength and thermal design. Substituting STP6NK50Z would cause excessive conduction loss and thermal runaway under original 12 A loads. It is not a drop-in replacement; redesign of gate drive, heatsinking, and SOA margins is required.

STP6NK50Z Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: SuperMESH™

Package/Case:: TO-220-3

Packaging:: Tube

Product Status:: Obsolete

FET Type:: N-Channel

Technology:: MOSFET (Metal Oxide)

Drain to Source Voltage (Vdss):: 500 V

Current - Continuous Drain (Id) @ 25°C:: 5.6A (Tc)

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

Rds On (Max) @ Id, Vgs:: 1.2Ohm @ 2.8A, 10V

Vgs(th) (Max) @ Id:: 4.5V @ 50µA

Gate Charge (Qg) (Max) @ Vgs:: 24.6 nC @ 10 V

Vgs (Max):: ±30V

Input Capacitance (Ciss) (Max) @ Vds:: 690 pF @ 25 V

FET Feature:: -

Power Dissipation (Max):: 90W (Tc)

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220

STP6NK50Z FAQ

1.How can I place an order for STP6NK50Z through Aetrix?

Please submit a Request for Quotation (RFQ) for STP6NK50Z 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 STP6NK50Z reliable?

The price and inventory of STP6NK50Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STP6NK50Z is usually 5 days.

3.What payment methods are accepted for STP6NK50Z?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STP6NK50Z transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STP6NK50Z?

STP6NK50Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STP6NK50Z 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 STP6NK50Z?

For technical support, including STP6NK50Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STP6NK50Z requirements.

6.How does Aetrix verify that STP6NK50Z is sourced from the original manufacturer or authorized distributors?

All STP6NK50Z 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 STP6NK50Z meets industry standards.

7.What is the process for return or replacement of STP6NK50Z?

All STP6NK50Z units undergo pre-shipment inspection (PSI). If there is an issue with STP6NK50Z, 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 STP6NK50Z part is unused and in its original packaging.

Return procedure for STP6NK50Z:

1.Submit a request within 90 days.

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

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